-<?php

-/**

-*

-* @package dbal

-* @copyright (c) 2007 phpBB Group

-* @license http://opensource.org/licenses/gpl-2.0.php GNU General Public License v2

-*

-*/

-

-/**

-* @ignore

-*/

-if (!defined('IN_PHPBB'))

-{

- exit;

-}

-

-/**

-* Database Tools for handling cross-db actions such as altering columns, etc.

-* Currently not supported is returning SQL for creating tables.

-*

-* @package dbal

-*/

-class phpbb_db_tools

-{

- /**

- * Current sql layer

- */

- var $sql_layer = '';

-

- /**

- * @var object DB object

- */

- var $db = NULL;

-

- /**

- * The Column types for every database we support

- * @var array

- */

- var $dbms_type_map = array(

- 'mysql_41' => array(

- 'INT:' => 'int(%d)',

- 'BINT' => 'bigint(20)',

- 'UINT' => 'mediumint(8) UNSIGNED',

- 'UINT:' => 'int(%d) UNSIGNED',

- 'TINT:' => 'tinyint(%d)',

- 'USINT' => 'smallint(4) UNSIGNED',

- 'BOOL' => 'tinyint(1) UNSIGNED',

- 'VCHAR' => 'varchar(255)',

- 'VCHAR:' => 'varchar(%d)',

- 'CHAR:' => 'char(%d)',

- 'XSTEXT' => 'text',

- 'XSTEXT_UNI'=> 'varchar(100)',

- 'STEXT' => 'text',

- 'STEXT_UNI' => 'varchar(255)',

- 'TEXT' => 'text',

- 'TEXT_UNI' => 'text',

- 'MTEXT' => 'mediumtext',

- 'MTEXT_UNI' => 'mediumtext',

- 'TIMESTAMP' => 'int(11) UNSIGNED',

- 'DECIMAL' => 'decimal(5,2)',

- 'DECIMAL:' => 'decimal(%d,2)',

- 'PDECIMAL' => 'decimal(6,3)',

- 'PDECIMAL:' => 'decimal(%d,3)',

- 'VCHAR_UNI' => 'varchar(255)',

- 'VCHAR_UNI:'=> 'varchar(%d)',

- 'VCHAR_CI' => 'varchar(255)',

- 'VARBINARY' => 'varbinary(255)',

- ),

-

- 'mysql_40' => array(

- 'INT:' => 'int(%d)',

- 'BINT' => 'bigint(20)',

- 'UINT' => 'mediumint(8) UNSIGNED',

- 'UINT:' => 'int(%d) UNSIGNED',

- 'TINT:' => 'tinyint(%d)',

- 'USINT' => 'smallint(4) UNSIGNED',

- 'BOOL' => 'tinyint(1) UNSIGNED',

- 'VCHAR' => 'varbinary(255)',

- 'VCHAR:' => 'varbinary(%d)',

- 'CHAR:' => 'binary(%d)',

- 'XSTEXT' => 'blob',

- 'XSTEXT_UNI'=> 'blob',

- 'STEXT' => 'blob',

- 'STEXT_UNI' => 'blob',

- 'TEXT' => 'blob',

- 'TEXT_UNI' => 'blob',

- 'MTEXT' => 'mediumblob',

- 'MTEXT_UNI' => 'mediumblob',

- 'TIMESTAMP' => 'int(11) UNSIGNED',

- 'DECIMAL' => 'decimal(5,2)',

- 'DECIMAL:' => 'decimal(%d,2)',

- 'PDECIMAL' => 'decimal(6,3)',

- 'PDECIMAL:' => 'decimal(%d,3)',

- 'VCHAR_UNI' => 'blob',

- 'VCHAR_UNI:'=> array('varbinary(%d)', 'limit' => array('mult', 3, 255, 'blob')),

- 'VCHAR_CI' => 'blob',

- 'VARBINARY' => 'varbinary(255)',

- ),

-

- 'firebird' => array(

- 'INT:' => 'INTEGER',

- 'BINT' => 'DOUBLE PRECISION',

- 'UINT' => 'INTEGER',

- 'UINT:' => 'INTEGER',

- 'TINT:' => 'INTEGER',

- 'USINT' => 'INTEGER',

- 'BOOL' => 'INTEGER',

- 'VCHAR' => 'VARCHAR(255) CHARACTER SET NONE',

- 'VCHAR:' => 'VARCHAR(%d) CHARACTER SET NONE',

- 'CHAR:' => 'CHAR(%d) CHARACTER SET NONE',

- 'XSTEXT' => 'BLOB SUB_TYPE TEXT CHARACTER SET NONE',

- 'STEXT' => 'BLOB SUB_TYPE TEXT CHARACTER SET NONE',

- 'TEXT' => 'BLOB SUB_TYPE TEXT CHARACTER SET NONE',

- 'MTEXT' => 'BLOB SUB_TYPE TEXT CHARACTER SET NONE',

- 'XSTEXT_UNI'=> 'VARCHAR(100) CHARACTER SET UTF8',

- 'STEXT_UNI' => 'VARCHAR(255) CHARACTER SET UTF8',

- 'TEXT_UNI' => 'BLOB SUB_TYPE TEXT CHARACTER SET UTF8',

- 'MTEXT_UNI' => 'BLOB SUB_TYPE TEXT CHARACTER SET UTF8',

- 'TIMESTAMP' => 'INTEGER',

- 'DECIMAL' => 'DOUBLE PRECISION',

- 'DECIMAL:' => 'DOUBLE PRECISION',

- 'PDECIMAL' => 'DOUBLE PRECISION',

- 'PDECIMAL:' => 'DOUBLE PRECISION',

- 'VCHAR_UNI' => 'VARCHAR(255) CHARACTER SET UTF8',

- 'VCHAR_UNI:'=> 'VARCHAR(%d) CHARACTER SET UTF8',

- 'VCHAR_CI' => 'VARCHAR(255) CHARACTER SET UTF8',

- 'VARBINARY' => 'CHAR(255) CHARACTER SET NONE',

- ),

-

- 'mssql' => array(

- 'INT:' => '[int]',

- 'BINT' => '[float]',

- 'UINT' => '[int]',

- 'UINT:' => '[int]',

- 'TINT:' => '[int]',

- 'USINT' => '[int]',

- 'BOOL' => '[int]',

- 'VCHAR' => '[varchar] (255)',

- 'VCHAR:' => '[varchar] (%d)',

- 'CHAR:' => '[char] (%d)',

- 'XSTEXT' => '[varchar] (1000)',

- 'STEXT' => '[varchar] (3000)',

- 'TEXT' => '[varchar] (8000)',

- 'MTEXT' => '[text]',

- 'XSTEXT_UNI'=> '[varchar] (100)',

- 'STEXT_UNI' => '[varchar] (255)',

- 'TEXT_UNI' => '[varchar] (4000)',

- 'MTEXT_UNI' => '[text]',

- 'TIMESTAMP' => '[int]',

- 'DECIMAL' => '[float]',

- 'DECIMAL:' => '[float]',

- 'PDECIMAL' => '[float]',

- 'PDECIMAL:' => '[float]',

- 'VCHAR_UNI' => '[varchar] (255)',

- 'VCHAR_UNI:'=> '[varchar] (%d)',

- 'VCHAR_CI' => '[varchar] (255)',

- 'VARBINARY' => '[varchar] (255)',

- ),

-

- 'mssqlnative' => array(

- 'INT:' => '[int]',

- 'BINT' => '[float]',

- 'UINT' => '[int]',

- 'UINT:' => '[int]',

- 'TINT:' => '[int]',

- 'USINT' => '[int]',

- 'BOOL' => '[int]',

- 'VCHAR' => '[varchar] (255)',

- 'VCHAR:' => '[varchar] (%d)',

- 'CHAR:' => '[char] (%d)',

- 'XSTEXT' => '[varchar] (1000)',

- 'STEXT' => '[varchar] (3000)',

- 'TEXT' => '[varchar] (8000)',

- 'MTEXT' => '[text]',

- 'XSTEXT_UNI'=> '[varchar] (100)',

- 'STEXT_UNI' => '[varchar] (255)',

- 'TEXT_UNI' => '[varchar] (4000)',

- 'MTEXT_UNI' => '[text]',

- 'TIMESTAMP' => '[int]',

- 'DECIMAL' => '[float]',

- 'DECIMAL:' => '[float]',

- 'PDECIMAL' => '[float]',

- 'PDECIMAL:' => '[float]',

- 'VCHAR_UNI' => '[varchar] (255)',

- 'VCHAR_UNI:'=> '[varchar] (%d)',

- 'VCHAR_CI' => '[varchar] (255)',

- 'VARBINARY' => '[varchar] (255)',

- ),

-

- 'oracle' => array(

- 'INT:' => 'number(%d)',

- 'BINT' => 'number(20)',

- 'UINT' => 'number(8)',

- 'UINT:' => 'number(%d)',

- 'TINT:' => 'number(%d)',

- 'USINT' => 'number(4)',

- 'BOOL' => 'number(1)',

- 'VCHAR' => 'varchar2(255)',

- 'VCHAR:' => 'varchar2(%d)',

- 'CHAR:' => 'char(%d)',

- 'XSTEXT' => 'varchar2(1000)',

- 'STEXT' => 'varchar2(3000)',

- 'TEXT' => 'clob',

- 'MTEXT' => 'clob',

- 'XSTEXT_UNI'=> 'varchar2(300)',

- 'STEXT_UNI' => 'varchar2(765)',

- 'TEXT_UNI' => 'clob',

- 'MTEXT_UNI' => 'clob',

- 'TIMESTAMP' => 'number(11)',

- 'DECIMAL' => 'number(5, 2)',

- 'DECIMAL:' => 'number(%d, 2)',

- 'PDECIMAL' => 'number(6, 3)',

- 'PDECIMAL:' => 'number(%d, 3)',

- 'VCHAR_UNI' => 'varchar2(765)',

- 'VCHAR_UNI:'=> array('varchar2(%d)', 'limit' => array('mult', 3, 765, 'clob')),

- 'VCHAR_CI' => 'varchar2(255)',

- 'VARBINARY' => 'raw(255)',

- ),

-

- 'sqlite' => array(

- 'INT:' => 'int(%d)',

- 'BINT' => 'bigint(20)',

- 'UINT' => 'INTEGER UNSIGNED', //'mediumint(8) UNSIGNED',

- 'UINT:' => 'INTEGER UNSIGNED', // 'int(%d) UNSIGNED',

- 'TINT:' => 'tinyint(%d)',

- 'USINT' => 'INTEGER UNSIGNED', //'mediumint(4) UNSIGNED',

- 'BOOL' => 'INTEGER UNSIGNED', //'tinyint(1) UNSIGNED',

- 'VCHAR' => 'varchar(255)',

- 'VCHAR:' => 'varchar(%d)',

- 'CHAR:' => 'char(%d)',

- 'XSTEXT' => 'text(65535)',

- 'STEXT' => 'text(65535)',

- 'TEXT' => 'text(65535)',

- 'MTEXT' => 'mediumtext(16777215)',

- 'XSTEXT_UNI'=> 'text(65535)',

- 'STEXT_UNI' => 'text(65535)',

- 'TEXT_UNI' => 'text(65535)',

- 'MTEXT_UNI' => 'mediumtext(16777215)',

- 'TIMESTAMP' => 'INTEGER UNSIGNED', //'int(11) UNSIGNED',

- 'DECIMAL' => 'decimal(5,2)',

- 'DECIMAL:' => 'decimal(%d,2)',

- 'PDECIMAL' => 'decimal(6,3)',

- 'PDECIMAL:' => 'decimal(%d,3)',

- 'VCHAR_UNI' => 'varchar(255)',

- 'VCHAR_UNI:'=> 'varchar(%d)',

- 'VCHAR_CI' => 'varchar(255)',

- 'VARBINARY' => 'blob',

- ),

-

- 'postgres' => array(

- 'INT:' => 'INT4',

- 'BINT' => 'INT8',

- 'UINT' => 'INT4', // unsigned

- 'UINT:' => 'INT4', // unsigned

- 'USINT' => 'INT2', // unsigned

- 'BOOL' => 'INT2', // unsigned

- 'TINT:' => 'INT2',

- 'VCHAR' => 'varchar(255)',

- 'VCHAR:' => 'varchar(%d)',

- 'CHAR:' => 'char(%d)',

- 'XSTEXT' => 'varchar(1000)',

- 'STEXT' => 'varchar(3000)',

- 'TEXT' => 'varchar(8000)',

- 'MTEXT' => 'TEXT',

- 'XSTEXT_UNI'=> 'varchar(100)',

- 'STEXT_UNI' => 'varchar(255)',

- 'TEXT_UNI' => 'varchar(4000)',

- 'MTEXT_UNI' => 'TEXT',

- 'TIMESTAMP' => 'INT4', // unsigned

- 'DECIMAL' => 'decimal(5,2)',

- 'DECIMAL:' => 'decimal(%d,2)',

- 'PDECIMAL' => 'decimal(6,3)',

- 'PDECIMAL:' => 'decimal(%d,3)',

- 'VCHAR_UNI' => 'varchar(255)',

- 'VCHAR_UNI:'=> 'varchar(%d)',

- 'VCHAR_CI' => 'varchar_ci',

- 'VARBINARY' => 'bytea',

- ),

- );

-

- /**

- * A list of types being unsigned for better reference in some db's

- * @var array

- */

- var $unsigned_types = array('UINT', 'UINT:', 'USINT', 'BOOL', 'TIMESTAMP');

-

- /**

- * A list of supported DBMS. We change this class to support more DBMS, the DBMS itself only need to follow some rules.

- * @var array

- */

- var $supported_dbms = array('firebird', 'mssql', 'mssqlnative', 'mysql_40', 'mysql_41', 'oracle', 'postgres', 'sqlite');

-

- /**

- * This is set to true if user only wants to return the 'to-be-executed' SQL statement(s) (as an array).

- * This mode has no effect on some methods (inserting of data for example). This is expressed within the methods command.

- */

- var $return_statements = false;

-

- /**

- * Constructor. Set DB Object and set {@link $return_statements return_statements}.

- *

- * @param phpbb_db_driver $db Database connection

- * @param bool $return_statements True if only statements should be returned and no SQL being executed

- */

- function phpbb_db_tools(phpbb_db_driver $db, $return_statements = false)

- {

- $this->db = $db;

- $this->return_statements = $return_statements;

-

- // Determine mapping database type

- switch ($this->db->sql_layer)

- {

- case 'mysql':

- $this->sql_layer = 'mysql_40';

- break;

-

- case 'mysql4':

- if (version_compare($this->db->sql_server_info(true), '4.1.3', '>='))

- {

- $this->sql_layer = 'mysql_41';

- }

- else

- {

- $this->sql_layer = 'mysql_40';

- }

- break;

-

- case 'mysqli':

- $this->sql_layer = 'mysql_41';

- break;

-

- case 'mssql':

- case 'mssql_odbc':

- $this->sql_layer = 'mssql';

- break;

-

- case 'mssqlnative':

- $this->sql_layer = 'mssqlnative';

- break;

-

- default:

- $this->sql_layer = $this->db->sql_layer;

- break;

- }

- }

-

- /**

- * Setter for {@link $return_statements return_statements}.

- *

- * @param bool $return_statements True if SQL should not be executed but returned as strings

- * @return null

- */

- public function set_return_statements($return_statements)

- {

- $this->return_statements = $return_statements;

- }

-

- /**

- * Gets a list of tables in the database.

- *

- * @return array Array of table names (all lower case)

- */

- function sql_list_tables()

- {

- switch ($this->db->sql_layer)

- {

- case 'mysql':

- case 'mysql4':

- case 'mysqli':

- $sql = 'SHOW TABLES';

- break;

-

- case 'sqlite':

- $sql = 'SELECT name

- FROM sqlite_master

- WHERE type = "table"';

- break;

-

- case 'mssql':

- case 'mssql_odbc':

- case 'mssqlnative':

- $sql = "SELECT name

- FROM sysobjects

- WHERE type='U'";

- break;

-

- case 'postgres':

- $sql = 'SELECT relname

- FROM pg_stat_user_tables';

- break;

-

- case 'firebird':

- $sql = 'SELECT rdb$relation_name

- FROM rdb$relations

- WHERE rdb$view_source is null

- AND rdb$system_flag = 0';

- break;

-

- case 'oracle':

- $sql = 'SELECT table_name

- FROM USER_TABLES';

- break;

- }

-

- $result = $this->db->sql_query($sql);

-

- $tables = array();

- while ($row = $this->db->sql_fetchrow($result))

- {

- $name = current($row);

- $tables[$name] = $name;

- }

- $this->db->sql_freeresult($result);

-

- return $tables;

- }

-

- /**

- * Check if table exists

- *

- *

- * @param string $table_name The table name to check for

- * @return bool true if table exists, else false

- */

- function sql_table_exists($table_name)

- {

- $this->db->sql_return_on_error(true);

- $result = $this->db->sql_query_limit('SELECT * FROM ' . $table_name, 1);

- $this->db->sql_return_on_error(false);

-

- if ($result)

- {

- $this->db->sql_freeresult($result);

- return true;

- }

-

- return false;

- }

-

- /**

- * Create SQL Table

- *

- * @param string $table_name The table name to create

- * @param array $table_data Array containing table data.

- * @return array Statements if $return_statements is true.

- */

- function sql_create_table($table_name, $table_data)

- {

- // holds the DDL for a column

- $columns = $statements = array();

-

- if ($this->sql_table_exists($table_name))

- {

- return $this->_sql_run_sql($statements);

- }

-

- // Begin transaction

- $statements[] = 'begin';

-

- // Determine if we have created a PRIMARY KEY in the earliest

- $primary_key_gen = false;

-

- // Determine if the table must be created with TEXTIMAGE

- $create_textimage = false;

-

- // Determine if the table requires a sequence

- $create_sequence = false;

-

- // Begin table sql statement

- switch ($this->sql_layer)

- {

- case 'mssql':

- case 'mssqlnative':

- $table_sql = 'CREATE TABLE [' . $table_name . '] (' . "\n";

- break;

-

- default:

- $table_sql = 'CREATE TABLE ' . $table_name . ' (' . "\n";

- break;

- }

-

- // Iterate through the columns to create a table

- foreach ($table_data['COLUMNS'] as $column_name => $column_data)

- {

- // here lies an array, filled with information compiled on the column's data

- $prepared_column = $this->sql_prepare_column_data($table_name, $column_name, $column_data);

-

- if (isset($prepared_column['auto_increment']) && strlen($column_name) > 26) // "${column_name}_gen"

- {

- trigger_error("Index name '${column_name}_gen' on table '$table_name' is too long. The maximum auto increment column length is 26 characters.", E_USER_ERROR);

- }

-

- // here we add the definition of the new column to the list of columns

- switch ($this->sql_layer)

- {

- case 'mssql':

- case 'mssqlnative':

- $columns[] = "\t [{$column_name}] " . $prepared_column['column_type_sql_default'];

- break;

-

- default:

- $columns[] = "\t {$column_name} " . $prepared_column['column_type_sql'];

- break;

- }

-

- // see if we have found a primary key set due to a column definition if we have found it, we can stop looking

- if (!$primary_key_gen)

- {

- $primary_key_gen = isset($prepared_column['primary_key_set']) && $prepared_column['primary_key_set'];

- }

-

- // create textimage DDL based off of the existance of certain column types

- if (!$create_textimage)

- {

- $create_textimage = isset($prepared_column['textimage']) && $prepared_column['textimage'];

- }

-

- // create sequence DDL based off of the existance of auto incrementing columns

- if (!$create_sequence && isset($prepared_column['auto_increment']) && $prepared_column['auto_increment'])

- {

- $create_sequence = $column_name;

- }

- }

-

- // this makes up all the columns in the create table statement

- $table_sql .= implode(",\n", $columns);

-

- // Close the table for two DBMS and add to the statements

- switch ($this->sql_layer)

- {

- case 'firebird':

- $table_sql .= "\n);";

- $statements[] = $table_sql;

- break;

-

- case 'mssql':

- case 'mssqlnative':

- $table_sql .= "\n) ON [PRIMARY]" . (($create_textimage) ? ' TEXTIMAGE_ON [PRIMARY]' : '');

- $statements[] = $table_sql;

- break;

- }

-

- // we have yet to create a primary key for this table,

- // this means that we can add the one we really wanted instead

- if (!$primary_key_gen)

- {

- // Write primary key

- if (isset($table_data['PRIMARY_KEY']))

- {

- if (!is_array($table_data['PRIMARY_KEY']))

- {

- $table_data['PRIMARY_KEY'] = array($table_data['PRIMARY_KEY']);

- }

-

- switch ($this->sql_layer)

- {

- case 'mysql_40':

- case 'mysql_41':

- case 'postgres':

- case 'sqlite':

- $table_sql .= ",\n\t PRIMARY KEY (" . implode(', ', $table_data['PRIMARY_KEY']) . ')';

- break;

-

- case 'firebird':

- case 'mssql':

- case 'mssqlnative':

- // We need the data here

- $old_return_statements = $this->return_statements;

- $this->return_statements = true;

-

- $primary_key_stmts = $this->sql_create_primary_key($table_name, $table_data['PRIMARY_KEY']);

- foreach ($primary_key_stmts as $pk_stmt)

- {

- $statements[] = $pk_stmt;

- }

-

- $this->return_statements = $old_return_statements;

- break;

-

- case 'oracle':

- $table_sql .= ",\n\t CONSTRAINT pk_{$table_name} PRIMARY KEY (" . implode(', ', $table_data['PRIMARY_KEY']) . ')';

- break;

- }

- }

- }

-

- // close the table

- switch ($this->sql_layer)

- {

- case 'mysql_41':

- // make sure the table is in UTF-8 mode

- $table_sql .= "\n) CHARACTER SET `utf8` COLLATE `utf8_bin`;";

- $statements[] = $table_sql;

- break;

-

- case 'mysql_40':

- case 'sqlite':

- $table_sql .= "\n);";

- $statements[] = $table_sql;

- break;

-

- case 'postgres':

- // do we need to add a sequence for auto incrementing columns?

- if ($create_sequence)

- {

- $statements[] = "CREATE SEQUENCE {$table_name}_seq;";

- }

-

- $table_sql .= "\n);";

- $statements[] = $table_sql;

- break;

-

- case 'oracle':

- $table_sql .= "\n)";

- $statements[] = $table_sql;

-

- // do we need to add a sequence and a tigger for auto incrementing columns?

- if ($create_sequence)

- {

- // create the actual sequence

- $statements[] = "CREATE SEQUENCE {$table_name}_seq";

-

- // the trigger is the mechanism by which we increment the counter

- $trigger = "CREATE OR REPLACE TRIGGER t_{$table_name}\n";

- $trigger .= "BEFORE INSERT ON {$table_name}\n";

- $trigger .= "FOR EACH ROW WHEN (\n";

- $trigger .= "\tnew.{$create_sequence} IS NULL OR new.{$create_sequence} = 0\n";

- $trigger .= ")\n";

- $trigger .= "BEGIN\n";

- $trigger .= "\tSELECT {$table_name}_seq.nextval\n";

- $trigger .= "\tINTO :new.{$create_sequence}\n";

- $trigger .= "\tFROM dual;\n";

- $trigger .= "END;";

-

- $statements[] = $trigger;

- }

- break;

-

- case 'firebird':

- if ($create_sequence)

- {

- $statements[] = "CREATE GENERATOR {$table_name}_gen;";

- $statements[] = "SET GENERATOR {$table_name}_gen TO 0;";

-

- $trigger = "CREATE TRIGGER t_$table_name FOR $table_name\n";

- $trigger .= "BEFORE INSERT\nAS\nBEGIN\n";

- $trigger .= "\tNEW.{$create_sequence} = GEN_ID({$table_name}_gen, 1);\nEND;";

- $statements[] = $trigger;

- }

- break;

- }

-

- // Write Keys

- if (isset($table_data['KEYS']))

- {

- foreach ($table_data['KEYS'] as $key_name => $key_data)

- {

- if (!is_array($key_data[1]))

- {

- $key_data[1] = array($key_data[1]);

- }

-

- $old_return_statements = $this->return_statements;

- $this->return_statements = true;

-

- $key_stmts = ($key_data[0] == 'UNIQUE') ? $this->sql_create_unique_index($table_name, $key_name, $key_data[1]) : $this->sql_create_index($table_name, $key_name, $key_data[1]);

-

- foreach ($key_stmts as $key_stmt)

- {

- $statements[] = $key_stmt;

- }

-

- $this->return_statements = $old_return_statements;

- }

- }

-

- // Commit Transaction

- $statements[] = 'commit';

-

- return $this->_sql_run_sql($statements);

- }

-

- /**

- * Handle passed database update array.

- * Expected structure...

- * Key being one of the following

- * drop_tables: Drop tables

- * add_tables: Add tables

- * change_columns: Column changes (only type, not name)

- * add_columns: Add columns to a table

- * drop_keys: Dropping keys

- * drop_columns: Removing/Dropping columns

- * add_primary_keys: adding primary keys

- * add_unique_index: adding an unique index

- * add_index: adding an index (can be column:index_size if you need to provide size)

- *

- * The values are in this format:

- * {TABLE NAME} => array(

- * {COLUMN NAME} => array({COLUMN TYPE}, {DEFAULT VALUE}, {OPTIONAL VARIABLES}),

- * {KEY/INDEX NAME} => array({COLUMN NAMES}),

- * )

- *

- * For more information have a look at /develop/create_schema_files.php (only available through SVN)

- */

- function perform_schema_changes($schema_changes)

- {

- if (empty($schema_changes))

- {

- return;

- }

-

- $statements = array();

- $sqlite = false;

-

- // For SQLite we need to perform the schema changes in a much more different way

- if ($this->db->sql_layer == 'sqlite' && $this->return_statements)

- {

- $sqlite_data = array();

- $sqlite = true;

- }

-

- // Drop tables?

- if (!empty($schema_changes['drop_tables']))

- {

- foreach ($schema_changes['drop_tables'] as $table)

- {

- // only drop table if it exists

- if ($this->sql_table_exists($table))

- {

- $result = $this->sql_table_drop($table);

- if ($this->return_statements)

- {

- $statements = array_merge($statements, $result);

- }

- }

- }

- }

-

- // Add tables?

- if (!empty($schema_changes['add_tables']))

- {

- foreach ($schema_changes['add_tables'] as $table => $table_data)

- {

- $result = $this->sql_create_table($table, $table_data);

- if ($this->return_statements)

- {

- $statements = array_merge($statements, $result);

- }

- }

- }

-

- // Change columns?

- if (!empty($schema_changes['change_columns']))

- {

- foreach ($schema_changes['change_columns'] as $table => $columns)

- {

- foreach ($columns as $column_name => $column_data)

- {

- // If the column exists we change it, else we add it ;)

- if ($column_exists = $this->sql_column_exists($table, $column_name))

- {

- $result = $this->sql_column_change($table, $column_name, $column_data, true);

- }

- else

- {

- $result = $this->sql_column_add($table, $column_name, $column_data, true);

- }

-

- if ($sqlite)

- {

- if ($column_exists)

- {

- $sqlite_data[$table]['change_columns'][] = $result;

- }

- else

- {

- $sqlite_data[$table]['add_columns'][] = $result;

- }

- }

- else if ($this->return_statements)

- {

- $statements = array_merge($statements, $result);

- }

- }

- }

- }

-

- // Add columns?

- if (!empty($schema_changes['add_columns']))

- {

- foreach ($schema_changes['add_columns'] as $table => $columns)

- {

- foreach ($columns as $column_name => $column_data)

- {

- // Only add the column if it does not exist yet

- if ($column_exists = $this->sql_column_exists($table, $column_name))

- {

- continue;

- // This is commented out here because it can take tremendous time on updates

-// $result = $this->sql_column_change($table, $column_name, $column_data, true);

- }

- else

- {

- $result = $this->sql_column_add($table, $column_name, $column_data, true);

- }

-

- if ($sqlite)

- {

- if ($column_exists)

- {

- continue;

-// $sqlite_data[$table]['change_columns'][] = $result;

- }

- else

- {

- $sqlite_data[$table]['add_columns'][] = $result;

- }

- }

- else if ($this->return_statements)

- {

- $statements = array_merge($statements, $result);

- }

- }

- }

- }

-

- // Remove keys?

- if (!empty($schema_changes['drop_keys']))

- {

- foreach ($schema_changes['drop_keys'] as $table => $indexes)

- {

- foreach ($indexes as $index_name)

- {

- if (!$this->sql_index_exists($table, $index_name))

- {

- continue;

- }

-

- $result = $this->sql_index_drop($table, $index_name);

-

- if ($this->return_statements)

- {

- $statements = array_merge($statements, $result);

- }

- }

- }

- }

-

- // Drop columns?

- if (!empty($schema_changes['drop_columns']))

- {

- foreach ($schema_changes['drop_columns'] as $table => $columns)

- {

- foreach ($columns as $column)

- {

- // Only remove the column if it exists...

- if ($this->sql_column_exists($table, $column))

- {

- $result = $this->sql_column_remove($table, $column, true);

-

- if ($sqlite)

- {

- $sqlite_data[$table]['drop_columns'][] = $result;

- }

- else if ($this->return_statements)

- {

- $statements = array_merge($statements, $result);

- }

- }

- }

- }

- }

-

- // Add primary keys?

- if (!empty($schema_changes['add_primary_keys']))

- {

- foreach ($schema_changes['add_primary_keys'] as $table => $columns)

- {

- $result = $this->sql_create_primary_key($table, $columns, true);

-

- if ($sqlite)

- {

- $sqlite_data[$table]['primary_key'] = $result;

- }

- else if ($this->return_statements)

- {

- $statements = array_merge($statements, $result);

- }

- }

- }

-

- // Add unqiue indexes?

- if (!empty($schema_changes['add_unique_index']))

- {

- foreach ($schema_changes['add_unique_index'] as $table => $index_array)

- {

- foreach ($index_array as $index_name => $column)

- {

- if ($this->sql_unique_index_exists($table, $index_name))

- {

- continue;

- }

-

- $result = $this->sql_create_unique_index($table, $index_name, $column);

-

- if ($this->return_statements)

- {

- $statements = array_merge($statements, $result);

- }

- }

- }

- }

-

- // Add indexes?

- if (!empty($schema_changes['add_index']))

- {

- foreach ($schema_changes['add_index'] as $table => $index_array)

- {

- foreach ($index_array as $index_name => $column)

- {

- if ($this->sql_index_exists($table, $index_name))

- {

- continue;

- }

-

- $result = $this->sql_create_index($table, $index_name, $column);

-

- if ($this->return_statements)

- {

- $statements = array_merge($statements, $result);

- }

- }

- }

- }

-

- if ($sqlite)

- {

- foreach ($sqlite_data as $table_name => $sql_schema_changes)

- {

- // Create temporary table with original data

- $statements[] = 'begin';

-

- $sql = "SELECT sql

- FROM sqlite_master

- WHERE type = 'table'

- AND name = '{$table_name}'

- ORDER BY type DESC, name;";

- $result = $this->db->sql_query($sql);

-

- if (!$result)

- {

- continue;

- }

-

- $row = $this->db->sql_fetchrow($result);

- $this->db->sql_freeresult($result);

-

- // Create a backup table and populate it, destroy the existing one

- $statements[] = preg_replace('#CREATE\s+TABLE\s+"?' . $table_name . '"?#i', 'CREATE TEMPORARY TABLE ' . $table_name . '_temp', $row['sql']);

- $statements[] = 'INSERT INTO ' . $table_name . '_temp SELECT * FROM ' . $table_name;

- $statements[] = 'DROP TABLE ' . $table_name;

-

- // Get the columns...

- preg_match('#\((.*)\)#s', $row['sql'], $matches);

-

- $plain_table_cols = trim($matches[1]);

- $new_table_cols = preg_split('/,(?![\s\w]+\))/m', $plain_table_cols);

- $column_list = array();

-

- foreach ($new_table_cols as $declaration)

- {

- $entities = preg_split('#\s+#', trim($declaration));

- if ($entities[0] == 'PRIMARY')

- {

- continue;

- }

- $column_list[] = $entities[0];

- }

-

- // note down the primary key notation because sqlite only supports adding it to the end for the new table

- $primary_key = false;

- $_new_cols = array();

-

- foreach ($new_table_cols as $key => $declaration)

- {

- $entities = preg_split('#\s+#', trim($declaration));

- if ($entities[0] == 'PRIMARY')

- {

- $primary_key = $declaration;

- continue;

- }

- $_new_cols[] = $declaration;

- }

-

- $new_table_cols = $_new_cols;

-

- // First of all... change columns

- if (!empty($sql_schema_changes['change_columns']))

- {

- foreach ($sql_schema_changes['change_columns'] as $column_sql)

- {

- foreach ($new_table_cols as $key => $declaration)

- {

- $entities = preg_split('#\s+#', trim($declaration));

- if (strpos($column_sql, $entities[0] . ' ') === 0)

- {

- $new_table_cols[$key] = $column_sql;

- }

- }

- }

- }

-

- if (!empty($sql_schema_changes['add_columns']))

- {

- foreach ($sql_schema_changes['add_columns'] as $column_sql)

- {

- $new_table_cols[] = $column_sql;

- }

- }

-

- // Now drop them...

- if (!empty($sql_schema_changes['drop_columns']))

- {

- foreach ($sql_schema_changes['drop_columns'] as $column_name)

- {

- // Remove from column list...

- $new_column_list = array();

- foreach ($column_list as $key => $value)

- {

- if ($value === $column_name)

- {

- continue;

- }

-

- $new_column_list[] = $value;

- }

-

- $column_list = $new_column_list;

-

- // Remove from table...

- $_new_cols = array();

- foreach ($new_table_cols as $key => $declaration)

- {

- $entities = preg_split('#\s+#', trim($declaration));

- if (strpos($column_name . ' ', $entities[0] . ' ') === 0)

- {

- continue;

- }

- $_new_cols[] = $declaration;

- }

- $new_table_cols = $_new_cols;

- }

- }

-

- // Primary key...

- if (!empty($sql_schema_changes['primary_key']))

- {

- $new_table_cols[] = 'PRIMARY KEY (' . implode(', ', $sql_schema_changes['primary_key']) . ')';

- }

- // Add a new one or the old primary key

- else if ($primary_key !== false)

- {

- $new_table_cols[] = $primary_key;

- }

-

- $columns = implode(',', $column_list);

-

- // create a new table and fill it up. destroy the temp one

- $statements[] = 'CREATE TABLE ' . $table_name . ' (' . implode(',', $new_table_cols) . ');';

- $statements[] = 'INSERT INTO ' . $table_name . ' (' . $columns . ') SELECT ' . $columns . ' FROM ' . $table_name . '_temp;';

- $statements[] = 'DROP TABLE ' . $table_name . '_temp';

-

- $statements[] = 'commit';

- }

- }

-

- if ($this->return_statements)

- {

- return $statements;

- }

- }

-

- /**

- * Gets a list of columns of a table.

- *

- * @param string $table Table name

- *

- * @return array Array of column names (all lower case)

- */

- function sql_list_columns($table)

- {

- $columns = array();

-

- switch ($this->sql_layer)

- {

- case 'mysql_40':

- case 'mysql_41':

- $sql = "SHOW COLUMNS FROM $table";

- break;

-

- // PostgreSQL has a way of doing this in a much simpler way but would

- // not allow us to support all versions of PostgreSQL

- case 'postgres':

- $sql = "SELECT a.attname

- FROM pg_class c, pg_attribute a

- WHERE c.relname = '{$table}'

- AND a.attnum > 0

- AND a.attrelid = c.oid";

- break;

-

- // same deal with PostgreSQL, we must perform more complex operations than

- // we technically could

- case 'mssql':

- case 'mssqlnative':

- $sql = "SELECT c.name

- FROM syscolumns c

- LEFT JOIN sysobjects o ON c.id = o.id

- WHERE o.name = '{$table}'";

- break;

-

- case 'oracle':

- $sql = "SELECT column_name

- FROM user_tab_columns

- WHERE LOWER(table_name) = '" . strtolower($table) . "'";

- break;

-

- case 'firebird':

- $sql = "SELECT RDB\$FIELD_NAME as FNAME

- FROM RDB\$RELATION_FIELDS

- WHERE RDB\$RELATION_NAME = '" . strtoupper($table) . "'";

- break;

-

- case 'sqlite':

- $sql = "SELECT sql

- FROM sqlite_master

- WHERE type = 'table'

- AND name = '{$table}'";

-

- $result = $this->db->sql_query($sql);

-

- if (!$result)

- {

- return false;

- }

-

- $row = $this->db->sql_fetchrow($result);

- $this->db->sql_freeresult($result);

-

- preg_match('#\((.*)\)#s', $row['sql'], $matches);

-

- $cols = trim($matches[1]);

- $col_array = preg_split('/,(?![\s\w]+\))/m', $cols);

-

- foreach ($col_array as $declaration)

- {

- $entities = preg_split('#\s+#', trim($declaration));

- if ($entities[0] == 'PRIMARY')

- {

- continue;

- }

-

- $column = strtolower($entities[0]);

- $columns[$column] = $column;

- }

-

- return $columns;

- break;

- }

-

- $result = $this->db->sql_query($sql);

-

- while ($row = $this->db->sql_fetchrow($result))

- {

- $column = strtolower(current($row));

- $columns[$column] = $column;

- }

- $this->db->sql_freeresult($result);

-

- return $columns;

- }

-

- /**

- * Check whether a specified column exist in a table

- *

- * @param string $table Table to check

- * @param string $column_name Column to check

- *

- * @return bool True if column exists, false otherwise

- */

- function sql_column_exists($table, $column_name)

- {

- $columns = $this->sql_list_columns($table);

-

- return isset($columns[$column_name]);

- }

-

- /**

- * Check if a specified index exists in table. Does not return PRIMARY KEY and UNIQUE indexes.

- *

- * @param string $table_name Table to check the index at

- * @param string $index_name The index name to check

- *

- * @return bool True if index exists, else false

- */

- function sql_index_exists($table_name, $index_name)

- {

- if ($this->sql_layer == 'mssql' || $this->sql_layer == 'mssqlnative')

- {

- $sql = "EXEC sp_statistics '$table_name'";

- $result = $this->db->sql_query($sql);

-

- while ($row = $this->db->sql_fetchrow($result))

- {

- if ($row['TYPE'] == 3)

- {

- if (strtolower($row['INDEX_NAME']) == strtolower($index_name))

- {

- $this->db->sql_freeresult($result);

- return true;

- }

- }

- }

- $this->db->sql_freeresult($result);

-

- return false;

- }

-

- switch ($this->sql_layer)

- {

- case 'firebird':

- $sql = "SELECT LOWER(RDB\$INDEX_NAME) as index_name

- FROM RDB\$INDICES

- WHERE RDB\$RELATION_NAME = '" . strtoupper($table_name) . "'

- AND RDB\$UNIQUE_FLAG IS NULL

- AND RDB\$FOREIGN_KEY IS NULL";

- $col = 'index_name';

- break;

-

- case 'postgres':

- $sql = "SELECT ic.relname as index_name

- FROM pg_class bc, pg_class ic, pg_index i

- WHERE (bc.oid = i.indrelid)

- AND (ic.oid = i.indexrelid)

- AND (bc.relname = '" . $table_name . "')

- AND (i.indisunique != 't')

- AND (i.indisprimary != 't')";

- $col = 'index_name';

- break;

-

- case 'mysql_40':

- case 'mysql_41':

- $sql = 'SHOW KEYS

- FROM ' . $table_name;

- $col = 'Key_name';

- break;

-

- case 'oracle':

- $sql = "SELECT index_name

- FROM user_indexes

- WHERE table_name = '" . strtoupper($table_name) . "'

- AND generated = 'N'

- AND uniqueness = 'NONUNIQUE'";

- $col = 'index_name';

- break;

-

- case 'sqlite':

- $sql = "PRAGMA index_list('" . $table_name . "');";

- $col = 'name';

- break;

- }

-

- $result = $this->db->sql_query($sql);

- while ($row = $this->db->sql_fetchrow($result))

- {

- if (($this->sql_layer == 'mysql_40' || $this->sql_layer == 'mysql_41') && !$row['Non_unique'])

- {

- continue;

- }

-

- // These DBMS prefix index name with the table name

- switch ($this->sql_layer)

- {

- case 'firebird':

- case 'oracle':

- case 'postgres':

- case 'sqlite':

- $row[$col] = substr($row[$col], strlen($table_name) + 1);

- break;

- }

-

- if (strtolower($row[$col]) == strtolower($index_name))

- {

- $this->db->sql_freeresult($result);

- return true;

- }

- }

- $this->db->sql_freeresult($result);

-

- return false;

- }

-

- /**

- * Check if a specified index exists in table. Does not return PRIMARY KEY and UNIQUE indexes.

- *

- * @param string $table_name Table to check the index at

- * @param string $index_name The index name to check

- *

- * @return bool True if index exists, else false

- */

- function sql_unique_index_exists($table_name, $index_name)

- {

- if ($this->sql_layer == 'mssql' || $this->sql_layer == 'mssqlnative')

- {

- $sql = "EXEC sp_statistics '$table_name'";

- $result = $this->db->sql_query($sql);

-

- while ($row = $this->db->sql_fetchrow($result))

- {

- // Usually NON_UNIQUE is the column we want to check, but we allow for both

- if ($row['TYPE'] == 3)

- {

- if (strtolower($row['INDEX_NAME']) == strtolower($index_name))

- {

- $this->db->sql_freeresult($result);

- return true;

- }

- }

- }

- $this->db->sql_freeresult($result);

- return false;

- }

-

- switch ($this->sql_layer)

- {

- case 'firebird':

- $sql = "SELECT LOWER(RDB\$INDEX_NAME) as index_name

- FROM RDB\$INDICES

- WHERE RDB\$RELATION_NAME = '" . strtoupper($table_name) . "'

- AND RDB\$UNIQUE_FLAG IS NOT NULL

- AND RDB\$FOREIGN_KEY IS NULL";

- $col = 'index_name';

- break;

-

- case 'postgres':

- $sql = "SELECT ic.relname as index_name, i.indisunique

- FROM pg_class bc, pg_class ic, pg_index i

- WHERE (bc.oid = i.indrelid)

- AND (ic.oid = i.indexrelid)

- AND (bc.relname = '" . $table_name . "')

- AND (i.indisprimary != 't')";

- $col = 'index_name';

- break;

-

- case 'mysql_40':

- case 'mysql_41':

- $sql = 'SHOW KEYS

- FROM ' . $table_name;

- $col = 'Key_name';

- break;

-

- case 'oracle':

- $sql = "SELECT index_name, table_owner

- FROM user_indexes

- WHERE table_name = '" . strtoupper($table_name) . "'

- AND generated = 'N'

- AND uniqueness = 'UNIQUE'";

- $col = 'index_name';

- break;

-

- case 'sqlite':

- $sql = "PRAGMA index_list('" . $table_name . "');";

- $col = 'name';

- break;

- }

-

- $result = $this->db->sql_query($sql);

- while ($row = $this->db->sql_fetchrow($result))

- {

- if (($this->sql_layer == 'mysql_40' || $this->sql_layer == 'mysql_41') && ($row['Non_unique'] || $row[$col] == 'PRIMARY'))

- {

- continue;

- }

-

- if ($this->sql_layer == 'sqlite' && !$row['unique'])

- {

- continue;

- }

-

- if ($this->sql_layer == 'postgres' && $row['indisunique'] != 't')

- {

- continue;

- }

-

- // These DBMS prefix index name with the table name

- switch ($this->sql_layer)

- {

- case 'oracle':

- // Two cases here... prefixed with U_[table_owner] and not prefixed with table_name

- if (strpos($row[$col], 'U_') === 0)

- {

- $row[$col] = substr($row[$col], strlen('U_' . $row['table_owner']) + 1);

- }

- else if (strpos($row[$col], strtoupper($table_name)) === 0)

- {

- $row[$col] = substr($row[$col], strlen($table_name) + 1);

- }

- break;

-

- case 'firebird':

- case 'postgres':

- case 'sqlite':

- $row[$col] = substr($row[$col], strlen($table_name) + 1);

- break;

- }

-

- if (strtolower($row[$col]) == strtolower($index_name))

- {

- $this->db->sql_freeresult($result);

- return true;

- }

- }

- $this->db->sql_freeresult($result);

-

- return false;

- }

-

- /**

- * Private method for performing sql statements (either execute them or return them)

- * @access private

- */

- function _sql_run_sql($statements)

- {

- if ($this->return_statements)

- {

- return $statements;

- }

-

- // We could add error handling here...

- foreach ($statements as $sql)

- {

- if ($sql === 'begin')

- {

- $this->db->sql_transaction('begin');

- }

- else if ($sql === 'commit')

- {

- $this->db->sql_transaction('commit');

- }

- else

- {

- $this->db->sql_query($sql);

- }

- }

-

- return true;

- }

-

- /**

- * Function to prepare some column information for better usage

- * @access private

- */

- function sql_prepare_column_data($table_name, $column_name, $column_data)

- {

- if (strlen($column_name) > 30)

- {

- trigger_error("Column name '$column_name' on table '$table_name' is too long. The maximum is 30 characters.", E_USER_ERROR);

- }

-

- // Get type

- if (strpos($column_data[0], ':') !== false)

- {

- list($orig_column_type, $column_length) = explode(':', $column_data[0]);

- if (!is_array($this->dbms_type_map[$this->sql_layer][$orig_column_type . ':']))

- {

- $column_type = sprintf($this->dbms_type_map[$this->sql_layer][$orig_column_type . ':'], $column_length);

- }

- else

- {

- if (isset($this->dbms_type_map[$this->sql_layer][$orig_column_type . ':']['rule']))

- {

- switch ($this->dbms_type_map[$this->sql_layer][$orig_column_type . ':']['rule'][0])

- {

- case 'div':

- $column_length /= $this->dbms_type_map[$this->sql_layer][$orig_column_type . ':']['rule'][1];

- $column_length = ceil($column_length);

- $column_type = sprintf($this->dbms_type_map[$this->sql_layer][$orig_column_type . ':'][0], $column_length);

- break;

- }

- }

-

- if (isset($this->dbms_type_map[$this->sql_layer][$orig_column_type . ':']['limit']))

- {

- switch ($this->dbms_type_map[$this->sql_layer][$orig_column_type . ':']['limit'][0])

- {

- case 'mult':

- $column_length *= $this->dbms_type_map[$this->sql_layer][$orig_column_type . ':']['limit'][1];

- if ($column_length > $this->dbms_type_map[$this->sql_layer][$orig_column_type . ':']['limit'][2])

- {

- $column_type = $this->dbms_type_map[$this->sql_layer][$orig_column_type . ':']['limit'][3];

- }

- else

- {

- $column_type = sprintf($this->dbms_type_map[$this->sql_layer][$orig_column_type . ':'][0], $column_length);

- }

- break;

- }

- }

- }

- $orig_column_type .= ':';

- }

- else

- {

- $orig_column_type = $column_data[0];

- $column_type = $this->dbms_type_map[$this->sql_layer][$column_data[0]];

- }

-

- // Adjust default value if db-dependent specified

- if (is_array($column_data[1]))

- {

- $column_data[1] = (isset($column_data[1][$this->sql_layer])) ? $column_data[1][$this->sql_layer] : $column_data[1]['default'];

- }

-

- $sql = '';

-

- $return_array = array();

-

- switch ($this->sql_layer)

- {

- case 'firebird':

- $sql .= " {$column_type} ";

- $return_array['column_type_sql_type'] = " {$column_type} ";

-

- if (!is_null($column_data[1]))

- {

- $sql .= 'DEFAULT ' . ((is_numeric($column_data[1])) ? $column_data[1] : "'{$column_data[1]}'") . ' ';

- $return_array['column_type_sql_default'] = ((is_numeric($column_data[1])) ? $column_data[1] : "'{$column_data[1]}'") . ' ';

- }

-

- $sql .= 'NOT NULL';

-

- // This is a UNICODE column and thus should be given it's fair share

- if (preg_match('/^X?STEXT_UNI|VCHAR_(CI|UNI:?)/', $column_data[0]))

- {

- $sql .= ' COLLATE UNICODE';

- }

-

- $return_array['auto_increment'] = false;

- if (isset($column_data[2]) && $column_data[2] == 'auto_increment')

- {

- $return_array['auto_increment'] = true;

- }

-

- break;

-

- case 'mssql':

- case 'mssqlnative':

- $sql .= " {$column_type} ";

- $sql_default = " {$column_type} ";

-

- // For adding columns we need the default definition

- if (!is_null($column_data[1]))

- {

- // For hexadecimal values do not use single quotes

- if (strpos($column_data[1], '0x') === 0)

- {

- $return_array['default'] = 'DEFAULT (' . $column_data[1] . ') ';

- $sql_default .= $return_array['default'];

- }

- else

- {

- $return_array['default'] = 'DEFAULT (' . ((is_numeric($column_data[1])) ? $column_data[1] : "'{$column_data[1]}'") . ') ';

- $sql_default .= $return_array['default'];

- }

- }

-

- if (isset($column_data[2]) && $column_data[2] == 'auto_increment')

- {

-// $sql .= 'IDENTITY (1, 1) ';

- $sql_default .= 'IDENTITY (1, 1) ';

- }

-

- $return_array['textimage'] = $column_type === '[text]';

-

- $sql .= 'NOT NULL';

- $sql_default .= 'NOT NULL';

-

- $return_array['column_type_sql_default'] = $sql_default;

-

- break;

-

- case 'mysql_40':

- case 'mysql_41':

- $sql .= " {$column_type} ";

-

- // For hexadecimal values do not use single quotes

- if (!is_null($column_data[1]) && substr($column_type, -4) !== 'text' && substr($column_type, -4) !== 'blob')

- {

- $sql .= (strpos($column_data[1], '0x') === 0) ? "DEFAULT {$column_data[1]} " : "DEFAULT '{$column_data[1]}' ";

- }

- $sql .= 'NOT NULL';

-

- if (isset($column_data[2]))

- {

- if ($column_data[2] == 'auto_increment')

- {

- $sql .= ' auto_increment';

- }

- else if ($this->sql_layer === 'mysql_41' && $column_data[2] == 'true_sort')

- {

- $sql .= ' COLLATE utf8_unicode_ci';

- }

- }

-

- break;

-

- case 'oracle':

- $sql .= " {$column_type} ";

- $sql .= (!is_null($column_data[1])) ? "DEFAULT '{$column_data[1]}' " : '';

-

- // In Oracle empty strings ('') are treated as NULL.

- // Therefore in oracle we allow NULL's for all DEFAULT '' entries

- // Oracle does not like setting NOT NULL on a column that is already NOT NULL (this happens only on number fields)

- if (!preg_match('/number/i', $column_type))

- {

- $sql .= ($column_data[1] === '') ? '' : 'NOT NULL';

- }

-

- $return_array['auto_increment'] = false;

- if (isset($column_data[2]) && $column_data[2] == 'auto_increment')

- {

- $return_array['auto_increment'] = true;

- }

-

- break;

-

- case 'postgres':

- $return_array['column_type'] = $column_type;

-

- $sql .= " {$column_type} ";

-

- $return_array['auto_increment'] = false;

- if (isset($column_data[2]) && $column_data[2] == 'auto_increment')

- {

- $default_val = "nextval('{$table_name}_seq')";

- $return_array['auto_increment'] = true;

- }

- else if (!is_null($column_data[1]))

- {

- $default_val = "'" . $column_data[1] . "'";

- $return_array['null'] = 'NOT NULL';

- $sql .= 'NOT NULL ';

- }

-

- $return_array['default'] = $default_val;

-

- $sql .= "DEFAULT {$default_val}";

-

- // Unsigned? Then add a CHECK contraint

- if (in_array($orig_column_type, $this->unsigned_types))

- {

- $return_array['constraint'] = "CHECK ({$column_name} >= 0)";

- $sql .= " CHECK ({$column_name} >= 0)";

- }

-

- break;

-

- case 'sqlite':

- $return_array['primary_key_set'] = false;

- if (isset($column_data[2]) && $column_data[2] == 'auto_increment')

- {

- $sql .= ' INTEGER PRIMARY KEY';

- $return_array['primary_key_set'] = true;

- }

- else

- {

- $sql .= ' ' . $column_type;

- }

-

- $sql .= ' NOT NULL ';

- $sql .= (!is_null($column_data[1])) ? "DEFAULT '{$column_data[1]}'" : '';

-

- break;

- }

-

- $return_array['column_type_sql'] = $sql;

-

- return $return_array;

- }

-

- /**

- * Add new column

- */

- function sql_column_add($table_name, $column_name, $column_data, $inline = false)

- {

- $column_data = $this->sql_prepare_column_data($table_name, $column_name, $column_data);

- $statements = array();

-

- switch ($this->sql_layer)

- {

- case 'firebird':

- // Does not support AFTER statement, only POSITION (and there you need the column position)

- $statements[] = 'ALTER TABLE ' . $table_name . ' ADD "' . strtoupper($column_name) . '" ' . $column_data['column_type_sql'];

- break;

-

- case 'mssql':

- case 'mssqlnative':

- // Does not support AFTER, only through temporary table

- $statements[] = 'ALTER TABLE [' . $table_name . '] ADD [' . $column_name . '] ' . $column_data['column_type_sql_default'];

- break;

-

- case 'mysql_40':

- case 'mysql_41':

- $after = (!empty($column_data['after'])) ? ' AFTER ' . $column_data['after'] : '';

- $statements[] = 'ALTER TABLE `' . $table_name . '` ADD COLUMN `' . $column_name . '` ' . $column_data['column_type_sql'] . $after;

- break;

-

- case 'oracle':

- // Does not support AFTER, only through temporary table

- $statements[] = 'ALTER TABLE ' . $table_name . ' ADD ' . $column_name . ' ' . $column_data['column_type_sql'];

- break;

-

- case 'postgres':

- // Does not support AFTER, only through temporary table

- if (version_compare($this->db->sql_server_info(true), '8.0', '>='))

- {

- $statements[] = 'ALTER TABLE ' . $table_name . ' ADD COLUMN "' . $column_name . '" ' . $column_data['column_type_sql'];

- }

- else

- {

- // old versions cannot add columns with default and null information

- $statements[] = 'ALTER TABLE ' . $table_name . ' ADD COLUMN "' . $column_name . '" ' . $column_data['column_type'] . ' ' . $column_data['constraint'];

-

- if (isset($column_data['null']))

- {

- if ($column_data['null'] == 'NOT NULL')

- {

- $statements[] = 'ALTER TABLE ' . $table_name . ' ALTER COLUMN ' . $column_name . ' SET NOT NULL';

- }

- }

-

- if (isset($column_data['default']))

- {

- $statements[] = 'ALTER TABLE ' . $table_name . ' ALTER COLUMN ' . $column_name . ' SET DEFAULT ' . $column_data['default'];

- }

- }

-

- break;

-

- case 'sqlite':

-

- if ($inline && $this->return_statements)

- {

- return $column_name . ' ' . $column_data['column_type_sql'];

- }

-

- if (version_compare(sqlite_libversion(), '3.0') == -1)

- {

- $sql = "SELECT sql

- FROM sqlite_master

- WHERE type = 'table'

- AND name = '{$table_name}'

- ORDER BY type DESC, name;";

- $result = $this->db->sql_query($sql);

-

- if (!$result)

- {

- break;

- }

-

- $row = $this->db->sql_fetchrow($result);

- $this->db->sql_freeresult($result);

-

- $statements[] = 'begin';

-

- // Create a backup table and populate it, destroy the existing one

- $statements[] = preg_replace('#CREATE\s+TABLE\s+"?' . $table_name . '"?#i', 'CREATE TEMPORARY TABLE ' . $table_name . '_temp', $row['sql']);

- $statements[] = 'INSERT INTO ' . $table_name . '_temp SELECT * FROM ' . $table_name;

- $statements[] = 'DROP TABLE ' . $table_name;

-

- preg_match('#\((.*)\)#s', $row['sql'], $matches);

-

- $new_table_cols = trim($matches[1]);

- $old_table_cols = preg_split('/,(?![\s\w]+\))/m', $new_table_cols);

- $column_list = array();

-

- foreach ($old_table_cols as $declaration)

- {

- $entities = preg_split('#\s+#', trim($declaration));

- if ($entities[0] == 'PRIMARY')

- {

- continue;

- }

- $column_list[] = $entities[0];

- }

-

- $columns = implode(',', $column_list);

-

- $new_table_cols = $column_name . ' ' . $column_data['column_type_sql'] . ',' . $new_table_cols;

-

- // create a new table and fill it up. destroy the temp one

- $statements[] = 'CREATE TABLE ' . $table_name . ' (' . $new_table_cols . ');';

- $statements[] = 'INSERT INTO ' . $table_name . ' (' . $columns . ') SELECT ' . $columns . ' FROM ' . $table_name . '_temp;';

- $statements[] = 'DROP TABLE ' . $table_name . '_temp';

-

- $statements[] = 'commit';

- }

- else

- {

- $statements[] = 'ALTER TABLE ' . $table_name . ' ADD ' . $column_name . ' [' . $column_data['column_type_sql'] . ']';

- }

- break;

- }

-

- return $this->_sql_run_sql($statements);

- }

-

- /**

- * Drop column

- */

- function sql_column_remove($table_name, $column_name, $inline = false)

- {

- $statements = array();

-

- switch ($this->sql_layer)

- {

- case 'firebird':

- $statements[] = 'ALTER TABLE ' . $table_name . ' DROP "' . strtoupper($column_name) . '"';

- break;

-

- case 'mssql':

- case 'mssqlnative':

- // remove default cosntraints first

- // http://msdn.microsoft.com/en-us/library/aa175912%28v=sql.80%29.aspx

- $statements[] = "DECLARE @drop_default_name VARCHAR(100), @cmd VARCHAR(1000)

- SET @drop_default_name =

- (SELECT so.name FROM sysobjects so

- JOIN sysconstraints sc ON so.id = sc.constid

- WHERE object_name(so.parent_obj) = '{$table_name}'

- AND so.xtype = 'D'

- AND sc.colid = (SELECT colid FROM syscolumns

- WHERE id = object_id('{$table_name}')

- AND name = '{$column_name}'))

- IF @drop_default_name <> ''

- BEGIN

- SET @cmd = 'ALTER TABLE [{$table_name}] DROP CONSTRAINT [' + @drop_default_name + ']'

- EXEC(@cmd)

- END";

- $statements[] = 'ALTER TABLE [' . $table_name . '] DROP COLUMN [' . $column_name . ']';

- break;

-

- case 'mysql_40':

- case 'mysql_41':

- $statements[] = 'ALTER TABLE `' . $table_name . '` DROP COLUMN `' . $column_name . '`';

- break;

-

- case 'oracle':

- $statements[] = 'ALTER TABLE ' . $table_name . ' DROP COLUMN ' . $column_name;

- break;

-

- case 'postgres':

- $statements[] = 'ALTER TABLE ' . $table_name . ' DROP COLUMN "' . $column_name . '"';

- break;

-

- case 'sqlite':

-

- if ($inline && $this->return_statements)

- {

- return $column_name;

- }

-

- if (version_compare(sqlite_libversion(), '3.0') == -1)

- {

- $sql = "SELECT sql

- FROM sqlite_master

- WHERE type = 'table'

- AND name = '{$table_name}'

- ORDER BY type DESC, name;";

- $result = $this->db->sql_query($sql);

-

- if (!$result)

- {

- break;

- }

-

- $row = $this->db->sql_fetchrow($result);

- $this->db->sql_freeresult($result);

-

- $statements[] = 'begin';

-

- // Create a backup table and populate it, destroy the existing one

- $statements[] = preg_replace('#CREATE\s+TABLE\s+"?' . $table_name . '"?#i', 'CREATE TEMPORARY TABLE ' . $table_name . '_temp', $row['sql']);

- $statements[] = 'INSERT INTO ' . $table_name . '_temp SELECT * FROM ' . $table_name;

- $statements[] = 'DROP TABLE ' . $table_name;

-

- preg_match('#\((.*)\)#s', $row['sql'], $matches);

-

- $new_table_cols = trim($matches[1]);

- $old_table_cols = preg_split('/,(?![\s\w]+\))/m', $new_table_cols);

- $column_list = array();

-

- foreach ($old_table_cols as $declaration)

- {

- $entities = preg_split('#\s+#', trim($declaration));

- if ($entities[0] == 'PRIMARY' || $entities[0] === $column_name)

- {

- continue;

- }

- $column_list[] = $entities[0];

- }

-

- $columns = implode(',', $column_list);

-

- $new_table_cols = preg_replace('/' . $column_name . '[^,]+(?:,|$)/m', '', $new_table_cols);

-

- // create a new table and fill it up. destroy the temp one

- $statements[] = 'CREATE TABLE ' . $table_name . ' (' . $new_table_cols . ');';

- $statements[] = 'INSERT INTO ' . $table_name . ' (' . $columns . ') SELECT ' . $columns . ' FROM ' . $table_name . '_temp;';

- $statements[] = 'DROP TABLE ' . $table_name . '_temp';

-

- $statements[] = 'commit';

- }

- else

- {

- $statements[] = 'ALTER TABLE ' . $table_name . ' DROP COLUMN ' . $column_name;

- }

- break;

- }

-

- return $this->_sql_run_sql($statements);

- }

-

- /**

- * Drop Index

- */

- function sql_index_drop($table_name, $index_name)

- {

- $statements = array();

-

- switch ($this->sql_layer)

- {

- case 'mssql':

- case 'mssqlnative':

- $statements[] = 'DROP INDEX ' . $table_name . '.' . $index_name;

- break;

-

- case 'mysql_40':

- case 'mysql_41':

- $statements[] = 'DROP INDEX ' . $index_name . ' ON ' . $table_name;

- break;

-

- case 'firebird':

- case 'oracle':

- case 'postgres':

- case 'sqlite':

- $statements[] = 'DROP INDEX ' . $table_name . '_' . $index_name;

- break;

- }

-

- return $this->_sql_run_sql($statements);

- }

-

- /**

- * Drop Table

- */

- function sql_table_drop($table_name)

- {

- $statements = array();

-

- if (!$this->sql_table_exists($table_name))

- {

- return $this->_sql_run_sql($statements);

- }

-

- // the most basic operation, get rid of the table

- $statements[] = 'DROP TABLE ' . $table_name;

-

- switch ($this->sql_layer)

- {

- case 'firebird':

- $sql = 'SELECT RDB$GENERATOR_NAME as gen

- FROM RDB$GENERATORS

- WHERE RDB$SYSTEM_FLAG = 0

- AND RDB$GENERATOR_NAME = \'' . strtoupper($table_name) . "_GEN'";

- $result = $this->db->sql_query($sql);

-

- // does a generator exist?

- if ($row = $this->db->sql_fetchrow($result))

- {

- $statements[] = "DROP GENERATOR {$row['gen']};";

- }

- $this->db->sql_freeresult($result);

- break;

-

- case 'oracle':

- $sql = 'SELECT A.REFERENCED_NAME

- FROM USER_DEPENDENCIES A, USER_TRIGGERS B

- WHERE A.REFERENCED_TYPE = \'SEQUENCE\'

- AND A.NAME = B.TRIGGER_NAME

- AND B.TABLE_NAME = \'' . strtoupper($table_name) . "'";

- $result = $this->db->sql_query($sql);

-

- // any sequences ref'd to this table's triggers?

- while ($row = $this->db->sql_fetchrow($result))

- {

- $statements[] = "DROP SEQUENCE {$row['referenced_name']}";

- }

- $this->db->sql_freeresult($result);

- break;

-

- case 'postgres':

- // PGSQL does not "tightly" bind sequences and tables, we must guess...

- $sql = "SELECT relname

- FROM pg_class

- WHERE relkind = 'S'

- AND relname = '{$table_name}_seq'";

- $result = $this->db->sql_query($sql);

-

- // We don't even care about storing the results. We already know the answer if we get rows back.

- if ($this->db->sql_fetchrow($result))

- {

- $statements[] = "DROP SEQUENCE {$table_name}_seq;\n";

- }

- $this->db->sql_freeresult($result);

- break;

- }

-

- return $this->_sql_run_sql($statements);

- }

-

- /**

- * Add primary key

- */

- function sql_create_primary_key($table_name, $column, $inline = false)

- {

- $statements = array();

-

- switch ($this->sql_layer)

- {

- case 'firebird':

- case 'postgres':

- case 'mysql_40':

- case 'mysql_41':

- $statements[] = 'ALTER TABLE ' . $table_name . ' ADD PRIMARY KEY (' . implode(', ', $column) . ')';

- break;

-

- case 'mssql':

- case 'mssqlnative':

- $sql = "ALTER TABLE [{$table_name}] WITH NOCHECK ADD ";

- $sql .= "CONSTRAINT [PK_{$table_name}] PRIMARY KEY CLUSTERED (";

- $sql .= '[' . implode("],\n\t\t[", $column) . ']';

- $sql .= ') ON [PRIMARY]';

-

- $statements[] = $sql;

- break;

-

- case 'oracle':

- $statements[] = 'ALTER TABLE ' . $table_name . 'add CONSTRAINT pk_' . $table_name . ' PRIMARY KEY (' . implode(', ', $column) . ')';

- break;

-

- case 'sqlite':

-

- if ($inline && $this->return_statements)

- {

- return $column;

- }

-

- $sql = "SELECT sql

- FROM sqlite_master

- WHERE type = 'table'

- AND name = '{$table_name}'

- ORDER BY type DESC, name;";

- $result = $this->db->sql_query($sql);

-

- if (!$result)

- {

- break;

- }

-

- $row = $this->db->sql_fetchrow($result);

- $this->db->sql_freeresult($result);

-

- $statements[] = 'begin';

-

- // Create a backup table and populate it, destroy the existing one

- $statements[] = preg_replace('#CREATE\s+TABLE\s+"?' . $table_name . '"?#i', 'CREATE TEMPORARY TABLE ' . $table_name . '_temp', $row['sql']);

- $statements[] = 'INSERT INTO ' . $table_name . '_temp SELECT * FROM ' . $table_name;

- $statements[] = 'DROP TABLE ' . $table_name;

-

- preg_match('#\((.*)\)#s', $row['sql'], $matches);

-

- $new_table_cols = trim($matches[1]);

- $old_table_cols = preg_split('/,(?![\s\w]+\))/m', $new_table_cols);

- $column_list = array();

-

- foreach ($old_table_cols as $declaration)

- {

- $entities = preg_split('#\s+#', trim($declaration));

- if ($entities[0] == 'PRIMARY')

- {

- continue;

- }

- $column_list[] = $entities[0];

- }

-

- $columns = implode(',', $column_list);

-

- // create a new table and fill it up. destroy the temp one

- $statements[] = 'CREATE TABLE ' . $table_name . ' (' . $new_table_cols . ', PRIMARY KEY (' . implode(', ', $column) . '));';

- $statements[] = 'INSERT INTO ' . $table_name . ' (' . $columns . ') SELECT ' . $columns . ' FROM ' . $table_name . '_temp;';

- $statements[] = 'DROP TABLE ' . $table_name . '_temp';

-

- $statements[] = 'commit';

- break;

- }

-

- return $this->_sql_run_sql($statements);

- }

-

- /**

- * Add unique index

- */

- function sql_create_unique_index($table_name, $index_name, $column)

- {

- $statements = array();

-

- $table_prefix = substr(CONFIG_TABLE, 0, -6); // strlen(config)

- if (strlen($table_name . $index_name) - strlen($table_prefix) > 24)

- {

- $max_length = strlen($table_prefix) + 24;

- trigger_error("Index name '{$table_name}_$index_name' on table '$table_name' is too long. The maximum is $max_length characters.", E_USER_ERROR);

- }

-

- switch ($this->sql_layer)

- {

- case 'firebird':

- case 'postgres':

- case 'oracle':

- case 'sqlite':

- $statements[] = 'CREATE UNIQUE INDEX ' . $table_name . '_' . $index_name . ' ON ' . $table_name . '(' . implode(', ', $column) . ')';

- break;

-

- case 'mysql_40':

- case 'mysql_41':

- $statements[] = 'ALTER TABLE ' . $table_name . ' ADD UNIQUE INDEX ' . $index_name . '(' . implode(', ', $column) . ')';

- break;

-

- case 'mssql':

- case 'mssqlnative':

- $statements[] = 'CREATE UNIQUE INDEX ' . $index_name . ' ON ' . $table_name . '(' . implode(', ', $column) . ') ON [PRIMARY]';

- break;

- }

-

- return $this->_sql_run_sql($statements);

- }

-

- /**

- * Add index

- */

- function sql_create_index($table_name, $index_name, $column)

- {

- $statements = array();

-

- $table_prefix = substr(CONFIG_TABLE, 0, -6); // strlen(config)

- if (strlen($table_name . $index_name) - strlen($table_prefix) > 24)

- {

- $max_length = strlen($table_prefix) + 24;

- trigger_error("Index name '{$table_name}_$index_name' on table '$table_name' is too long. The maximum is $max_length characters.", E_USER_ERROR);

- }

-

- // remove index length unless MySQL4

- if ('mysql_40' != $this->sql_layer)

- {

- $column = preg_replace('#:.*$#', '', $column);

- }

-

- switch ($this->sql_layer)

- {

- case 'firebird':

- case 'postgres':

- case 'oracle':

- case 'sqlite':

- $statements[] = 'CREATE INDEX ' . $table_name . '_' . $index_name . ' ON ' . $table_name . '(' . implode(', ', $column) . ')';

- break;

-

- case 'mysql_40':

- // add index size to definition as required by MySQL4

- foreach ($column as $i => $col)

- {

- if (false !== strpos($col, ':'))

- {

- list($col, $index_size) = explode(':', $col);

- $column[$i] = "$col($index_size)";

- }

- }

- // no break

- case 'mysql_41':

- $statements[] = 'ALTER TABLE ' . $table_name . ' ADD INDEX ' . $index_name . '(' . implode(', ', $column) . ')';

- break;

-

- case 'mssql':

- case 'mssqlnative':

- $statements[] = 'CREATE INDEX ' . $index_name . ' ON ' . $table_name . '(' . implode(', ', $column) . ') ON [PRIMARY]';

- break;

- }

-

- return $this->_sql_run_sql($statements);

- }

-

- /**

- * List all of the indices that belong to a table,

- * does not count:

- * * UNIQUE indices

- * * PRIMARY keys

- */

- function sql_list_index($table_name)

- {

- $index_array = array();

-

- if ($this->sql_layer == 'mssql' || $this->sql_layer == 'mssqlnative')

- {

- $sql = "EXEC sp_statistics '$table_name'";

- $result = $this->db->sql_query($sql);

- while ($row = $this->db->sql_fetchrow($result))

- {

- if ($row['TYPE'] == 3)

- {

- $index_array[] = $row['INDEX_NAME'];

- }

- }

- $this->db->sql_freeresult($result);

- }

- else

- {

- switch ($this->sql_layer)

- {

- case 'firebird':

- $sql = "SELECT LOWER(RDB\$INDEX_NAME) as index_name

- FROM RDB\$INDICES

- WHERE RDB\$RELATION_NAME = '" . strtoupper($table_name) . "'

- AND RDB\$UNIQUE_FLAG IS NULL

- AND RDB\$FOREIGN_KEY IS NULL";

- $col = 'index_name';

- break;

-

- case 'postgres':

- $sql = "SELECT ic.relname as index_name

- FROM pg_class bc, pg_class ic, pg_index i

- WHERE (bc.oid = i.indrelid)

- AND (ic.oid = i.indexrelid)

- AND (bc.relname = '" . $table_name . "')

- AND (i.indisunique != 't')

- AND (i.indisprimary != 't')";

- $col = 'index_name';

- break;

-

- case 'mysql_40':

- case 'mysql_41':

- $sql = 'SHOW KEYS

- FROM ' . $table_name;

- $col = 'Key_name';

- break;

-

- case 'oracle':

- $sql = "SELECT index_name

- FROM user_indexes

- WHERE table_name = '" . strtoupper($table_name) . "'

- AND generated = 'N'

- AND uniqueness = 'NONUNIQUE'";

- $col = 'index_name';

- break;

-

- case 'sqlite':

- $sql = "PRAGMA index_info('" . $table_name . "');";

- $col = 'name';

- break;

- }

-

- $result = $this->db->sql_query($sql);

- while ($row = $this->db->sql_fetchrow($result))

- {

- if (($this->sql_layer == 'mysql_40' || $this->sql_layer == 'mysql_41') && !$row['Non_unique'])

- {

- continue;

- }

-

- switch ($this->sql_layer)

- {

- case 'firebird':

- case 'oracle':

- case 'postgres':

- case 'sqlite':

- $row[$col] = substr($row[$col], strlen($table_name) + 1);

- break;

- }

-

- $index_array[] = $row[$col];

- }

- $this->db->sql_freeresult($result);

- }

-

- return array_map('strtolower', $index_array);

- }

-

- /**

- * Change column type (not name!)

- */

- function sql_column_change($table_name, $column_name, $column_data, $inline = false)

- {

- $column_data = $this->sql_prepare_column_data($table_name, $column_name, $column_data);

- $statements = array();

-

- switch ($this->sql_layer)

- {

- case 'firebird':

- // Change type...

- if (!empty($column_data['column_type_sql_default']))

- {

- $statements[] = 'ALTER TABLE ' . $table_name . ' ALTER COLUMN "' . strtoupper($column_name) . '" TYPE ' . ' ' . $column_data['column_type_sql_type'];

- $statements[] = 'ALTER TABLE ' . $table_name . ' ALTER COLUMN "' . strtoupper($column_name) . '" SET DEFAULT ' . ' ' . $column_data['column_type_sql_default'];

- }

- else

- {

- // TODO: try to change pkey without removing trigger, generator or constraints. ATM this query may fail.

- $statements[] = 'ALTER TABLE ' . $table_name . ' ALTER COLUMN "' . strtoupper($column_name) . '" TYPE ' . ' ' . $column_data['column_type_sql_type'];

- }

- break;

-

- case 'mssql':

- case 'mssqlnative':

- $statements[] = 'ALTER TABLE [' . $table_name . '] ALTER COLUMN [' . $column_name . '] ' . $column_data['column_type_sql'];

-

- if (!empty($column_data['default']))

- {

- // Using TRANSACT-SQL for this statement because we do not want to have colliding data if statements are executed at a later stage

- $statements[] = "DECLARE @drop_default_name VARCHAR(100), @cmd VARCHAR(1000)

- SET @drop_default_name =

- (SELECT so.name FROM sysobjects so

- JOIN sysconstraints sc ON so.id = sc.constid

- WHERE object_name(so.parent_obj) = '{$table_name}'

- AND so.xtype = 'D'

- AND sc.colid = (SELECT colid FROM syscolumns

- WHERE id = object_id('{$table_name}')

- AND name = '{$column_name}'))

- IF @drop_default_name <> ''

- BEGIN

- SET @cmd = 'ALTER TABLE [{$table_name}] DROP CONSTRAINT [' + @drop_default_name + ']'

- EXEC(@cmd)

- END

- SET @cmd = 'ALTER TABLE [{$table_name}] ADD CONSTRAINT [DF_{$table_name}_{$column_name}_1] {$column_data['default']} FOR [{$column_name}]'

- EXEC(@cmd)";

- }

- break;

-

- case 'mysql_40':

- case 'mysql_41':

- $statements[] = 'ALTER TABLE `' . $table_name . '` CHANGE `' . $column_name . '` `' . $column_name . '` ' . $column_data['column_type_sql'];

- break;

-

- case 'oracle':

- $statements[] = 'ALTER TABLE ' . $table_name . ' MODIFY ' . $column_name . ' ' . $column_data['column_type_sql'];

- break;

-

- case 'postgres':

- $sql = 'ALTER TABLE ' . $table_name . ' ';

-

- $sql_array = array();

- $sql_array[] = 'ALTER COLUMN ' . $column_name . ' TYPE ' . $column_data['column_type'];

-

- if (isset($column_data['null']))

- {

- if ($column_data['null'] == 'NOT NULL')

- {

- $sql_array[] = 'ALTER COLUMN ' . $column_name . ' SET NOT NULL';

- }

- else if ($column_data['null'] == 'NULL')

- {

- $sql_array[] = 'ALTER COLUMN ' . $column_name . ' DROP NOT NULL';

- }

- }

-

- if (isset($column_data['default']))

- {

- $sql_array[] = 'ALTER COLUMN ' . $column_name . ' SET DEFAULT ' . $column_data['default'];

- }

-

- // we don't want to double up on constraints if we change different number data types

- if (isset($column_data['constraint']))

- {

- $constraint_sql = "SELECT consrc as constraint_data

- FROM pg_constraint, pg_class bc

- WHERE conrelid = bc.oid

- AND bc.relname = '{$table_name}'

- AND NOT EXISTS (

- SELECT *

- FROM pg_constraint as c, pg_inherits as i

- WHERE i.inhrelid = pg_constraint.conrelid

- AND c.conname = pg_constraint.conname

- AND c.consrc = pg_constraint.consrc

- AND c.conrelid = i.inhparent

- )";

-

- $constraint_exists = false;

-

- $result = $this->db->sql_query($constraint_sql);

- while ($row = $this->db->sql_fetchrow($result))

- {

- if (trim($row['constraint_data']) == trim($column_data['constraint']))

- {

- $constraint_exists = true;

- break;

- }

- }

- $this->db->sql_freeresult($result);

-

- if (!$constraint_exists)

- {

- $sql_array[] = 'ADD ' . $column_data['constraint'];

- }

- }

-

- $sql .= implode(', ', $sql_array);

-

- $statements[] = $sql;

- break;

-

- case 'sqlite':

-

- if ($inline && $this->return_statements)

- {

- return $column_name . ' ' . $column_data['column_type_sql'];

- }

-

- $sql = "SELECT sql

- FROM sqlite_master

- WHERE type = 'table'

- AND name = '{$table_name}'

- ORDER BY type DESC, name;";

- $result = $this->db->sql_query($sql);

-

- if (!$result)

- {

- break;

- }

-

- $row = $this->db->sql_fetchrow($result);

- $this->db->sql_freeresult($result);

-

- $statements[] = 'begin';

-

- // Create a temp table and populate it, destroy the existing one

- $statements[] = preg_replace('#CREATE\s+TABLE\s+"?' . $table_name . '"?#i', 'CREATE TEMPORARY TABLE ' . $table_name . '_temp', $row['sql']);

- $statements[] = 'INSERT INTO ' . $table_name . '_temp SELECT * FROM ' . $table_name;

- $statements[] = 'DROP TABLE ' . $table_name;

-

- preg_match('#\((.*)\)#s', $row['sql'], $matches);

-

- $new_table_cols = trim($matches[1]);

- $old_table_cols = preg_split('/,(?![\s\w]+\))/m', $new_table_cols);

- $column_list = array();

-

- foreach ($old_table_cols as $key => $declaration)

- {

- $entities = preg_split('#\s+#', trim($declaration));

- $column_list[] = $entities[0];

- if ($entities[0] == $column_name)

- {

- $old_table_cols[$key] = $column_name . ' ' . $column_data['column_type_sql'];

- }

- }

-

- $columns = implode(',', $column_list);

-

- // create a new table and fill it up. destroy the temp one

- $statements[] = 'CREATE TABLE ' . $table_name . ' (' . implode(',', $old_table_cols) . ');';

- $statements[] = 'INSERT INTO ' . $table_name . ' (' . $columns . ') SELECT ' . $columns . ' FROM ' . $table_name . '_temp;';

- $statements[] = 'DROP TABLE ' . $table_name . '_temp';

-

- $statements[] = 'commit';

-

- break;

- }

-

- return $this->_sql_run_sql($statements);

- }

-}