+<?php

+/**

+ *

+ * This file is part of the phpBB Forum Software package.

+ *

+ * @copyright (c) phpBB Limited <https://www.phpbb.com>

+ * @license GNU General Public License, version 2 (GPL-2.0)

+ *

+ * For full copyright and license information, please see

+ * the docs/CREDITS.txt file.

+ *

+ */

+

+namespace phpbb\db\tools;

+

+/**

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

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

+ */

+class mssql extends tools

+{

+ /**

+ * Is the used MS SQL Server a SQL Server 2000?

+ * @var bool

+ */

+ protected $is_sql_server_2000;

+

+ /**

+ * Get the column types for mssql based databases

+ *

+ * @return array

+ */

+ public static function get_dbms_type_map()

+ {

+ return array(

+ 'mssql' => array(

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

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

+ 'ULINT' => '[int]',

+ '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'=> '[nvarchar] (100)',

+ 'STEXT_UNI' => '[nvarchar] (255)',

+ 'TEXT_UNI' => '[nvarchar] (4000)',

+ 'MTEXT_UNI' => '[ntext]',

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

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

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

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

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

+ 'VCHAR_UNI' => '[nvarchar] (255)',

+ 'VCHAR_UNI:'=> '[nvarchar] (%d)',

+ 'VCHAR_CI' => '[nvarchar] (255)',

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

+ ),

+

+ 'mssqlnative' => array(

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

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

+ 'ULINT' => '[int]',

+ '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'=> '[nvarchar] (100)',

+ 'STEXT_UNI' => '[nvarchar] (255)',

+ 'TEXT_UNI' => '[nvarchar] (4000)',

+ 'MTEXT_UNI' => '[ntext]',

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

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

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

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

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

+ 'VCHAR_UNI' => '[nvarchar] (255)',

+ 'VCHAR_UNI:'=> '[nvarchar] (%d)',

+ 'VCHAR_CI' => '[nvarchar] (255)',

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

+ ),

+ );

+ }

+

+ /**

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

+ *

+ * @param \phpbb\db\driver\driver_interface $db Database connection

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

+ */

+ public function __construct(\phpbb\db\driver\driver_interface $db, $return_statements = false)

+ {

+ parent::__construct($db, $return_statements);

+

+ // Determine mapping database type

+ switch ($this->db->get_sql_layer())

+ {

+ case 'mssql_odbc':

+ $this->sql_layer = 'mssql';

+ break;

+

+ case 'mssqlnative':

+ $this->sql_layer = 'mssqlnative';

+ break;

+ }

+

+ $this->dbms_type_map = self::get_dbms_type_map();

+ }

+

+ /**

+ * {@inheritDoc}

+ */

+ function sql_list_tables()

+ {

+ $sql = "SELECT name

+ FROM sysobjects

+ WHERE type='U'";

+ $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;

+ }

+

+ /**

+ * {@inheritDoc}

+ */

+ 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 requires a sequence

+ $create_sequence = false;

+

+ // Begin table sql statement

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

+

+ if (!isset($table_data['PRIMARY_KEY']))

+ {

+ $table_data['COLUMNS']['mssqlindex'] = array('UINT', null, 'auto_increment');

+ $table_data['PRIMARY_KEY'] = 'mssqlindex';

+ }

+

+ // 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']) && $prepared_column['auto_increment'] && strlen($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

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

+

+ // 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 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

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

+ $statements[] = $table_sql;

+

+ // 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']);

+ }

+

+ // 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;

+ }

+ }

+

+ // 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);

+ }

+

+ /**

+ * {@inheritDoc}

+ */

+ function sql_list_columns($table_name)

+ {

+ $columns = array();

+

+ $sql = "SELECT c.name

+ FROM syscolumns c

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

+ WHERE o.name = '{$table_name}'";

+ $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;

+ }

+

+ /**

+ * {@inheritDoc}

+ */

+ function sql_index_exists($table_name, $index_name)

+ {

+ $sql = "EXEC sp_statistics '$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;

+ }

+

+ /**

+ * {@inheritDoc}

+ */

+ function sql_unique_index_exists($table_name, $index_name)

+ {

+ $sql = "EXEC sp_statistics '$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;

+ }

+

+ /**

+ * {@inheritDoc}

+ */

+ 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

+ list($column_type, ) = $this->get_column_type($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();

+

+ $sql .= " {$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]';

+

+ if (!is_null($column_data[1]) || (isset($column_data[2]) && $column_data[2] == 'auto_increment'))

+ {

+ $sql .= 'NOT NULL';

+ $sql_default .= 'NOT NULL';

+ }

+ else

+ {

+ $sql .= 'NULL';

+ $sql_default .= 'NULL';

+ }

+

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

+

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

+

+ return $return_array;

+ }

+

+ /**

+ * {@inheritDoc}

+ */

+ 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();

+

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

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

+

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

+ }

+

+ /**

+ * {@inheritDoc}

+ */

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

+ {

+ $statements = array();

+

+ // We need the data here

+ $old_return_statements = $this->return_statements;

+ $this->return_statements = true;

+

+ $indexes = $this->get_existing_indexes($table_name, $column_name);

+ $indexes = array_merge($indexes, $this->get_existing_indexes($table_name, $column_name, true));

+

+ // Drop any indexes

+ $recreate_indexes = array();

+ if (!empty($indexes))

+ {

+ foreach ($indexes as $index_name => $index_data)

+ {

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

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

+ if (count($index_data) > 1)

+ {

+ // Remove this column from the index and recreate it

+ $recreate_indexes[$index_name] = array_diff($index_data, array($column_name));

+ }

+ }

+ }

+

+ // Drop primary keys depending on this column

+ $result = $this->mssql_get_drop_default_primary_key_queries($table_name, $column_name);

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

+

+ // Drop default value constraint

+ $result = $this->mssql_get_drop_default_constraints_queries($table_name, $column_name);

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

+

+ // Remove the column

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

+

+ if (!empty($recreate_indexes))

+ {

+ // Recreate indexes after we removed the column

+ foreach ($recreate_indexes as $index_name => $index_data)

+ {

+ $result = $this->sql_create_index($table_name, $index_name, $index_data);

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

+ }

+ }

+

+ $this->return_statements = $old_return_statements;

+

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

+ }

+

+ /**

+ * {@inheritDoc}

+ */

+ function sql_index_drop($table_name, $index_name)

+ {

+ $statements = array();

+

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

+

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

+ }

+

+ /**

+ * {@inheritDoc}

+ */

+ 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;

+

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

+ }

+

+ /**

+ * {@inheritDoc}

+ */

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

+ {

+ $statements = array();

+

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

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

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

+ $sql .= ')';

+

+ $statements[] = $sql;

+

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

+ }

+

+ /**

+ * {@inheritDoc}

+ */

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

+ {

+ $statements = array();

+

+ if ($this->mssql_is_sql_server_2000())

+ {

+ $this->check_index_name_length($table_name, $index_name);

+ }

+

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

+

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

+ }

+

+ /**

+ * {@inheritDoc}

+ */

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

+ {

+ $statements = array();

+

+ $this->check_index_name_length($table_name, $index_name);

+

+ // remove index length

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

+

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

+

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

+ }

+

+ /**

+ * {@inheritdoc}

+ */

+ protected function get_max_index_name_length()

+ {

+ if ($this->mssql_is_sql_server_2000())

+ {

+ return parent::get_max_index_name_length();

+ }

+ else

+ {

+ return 128;

+ }

+ }

+

+ /**

+ * {@inheritDoc}

+ */

+ function sql_list_index($table_name)

+ {

+ $index_array = array();

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

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

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

+ {

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

+ {

+ $index_array[] = strtolower($row['INDEX_NAME']);

+ }

+ }

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

+

+ return $index_array;

+ }

+

+ /**

+ * {@inheritDoc}

+ */

+ 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();

+

+ // We need the data here

+ $old_return_statements = $this->return_statements;

+ $this->return_statements = true;

+

+ $indexes = $this->get_existing_indexes($table_name, $column_name);

+ $unique_indexes = $this->get_existing_indexes($table_name, $column_name, true);

+

+ // Drop any indexes

+ if (!empty($indexes) || !empty($unique_indexes))

+ {

+ $drop_indexes = array_merge(array_keys($indexes), array_keys($unique_indexes));

+ foreach ($drop_indexes as $index_name)

+ {

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

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

+ }

+ }

+

+ // Drop default value constraint

+ $result = $this->mssql_get_drop_default_constraints_queries($table_name, $column_name);

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

+

+ // Change the column

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

+

+ if (!empty($column_data['default']) && !$this->mssql_is_column_identity($table_name, $column_name))

+ {

+ // Add new default value constraint

+ $statements[] = 'ALTER TABLE [' . $table_name . '] ADD CONSTRAINT [DF_' . $table_name . '_' . $column_name . '_1] ' . $column_data['default'] . ' FOR [' . $column_name . ']';

+ }

+

+ if (!empty($indexes))

+ {

+ // Recreate indexes after we changed the column

+ foreach ($indexes as $index_name => $index_data)

+ {

+ $result = $this->sql_create_index($table_name, $index_name, $index_data);

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

+ }

+ }

+

+ if (!empty($unique_indexes))

+ {

+ // Recreate unique indexes after we changed the column

+ foreach ($unique_indexes as $index_name => $index_data)

+ {

+ $result = $this->sql_create_unique_index($table_name, $index_name, $index_data);

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

+ }

+ }

+

+ $this->return_statements = $old_return_statements;

+

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

+ }

+

+ /**

+ * Get queries to drop the default constraints of a column

+ *

+ * We need to drop the default constraints of a column,

+ * before being able to change their type or deleting them.

+ *

+ * @param string $table_name

+ * @param string $column_name

+ * @return array Array with SQL statements

+ */

+ protected function mssql_get_drop_default_constraints_queries($table_name, $column_name)

+ {

+ $statements = array();

+ if ($this->mssql_is_sql_server_2000())

+ {

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

+ // Deprecated in SQL Server 2005

+ $sql = "SELECT so.name AS def_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}')";

+ }

+ else

+ {

+ $sql = "SELECT dobj.name AS def_name

+ FROM sys.columns col

+ LEFT OUTER JOIN sys.objects dobj ON (dobj.object_id = col.default_object_id AND dobj.type = 'D')

+ WHERE col.object_id = object_id('{$table_name}')

+ AND col.name = '{$column_name}'

+ AND dobj.name IS NOT NULL";

+ }

+

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

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

+ {

+ $statements[] = 'ALTER TABLE [' . $table_name . '] DROP CONSTRAINT [' . $row['def_name'] . ']';

+ }

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

+

+ return $statements;

+ }

+

+ /**

+ * Get queries to drop the primary keys depending on the specified column

+ *

+ * We need to drop primary keys depending on this column before being able

+ * to delete them.

+ *

+ * @param string $table_name

+ * @param string $column_name

+ * @return array Array with SQL statements

+ */

+ protected function mssql_get_drop_default_primary_key_queries($table_name, $column_name)

+ {

+ $statements = array();

+

+ $sql = "SELECT ccu.CONSTRAINT_NAME, ccu.COLUMN_NAME

+ FROM INFORMATION_SCHEMA.TABLE_CONSTRAINTS tc

+ JOIN INFORMATION_SCHEMA.CONSTRAINT_COLUMN_USAGE ccu ON tc.CONSTRAINT_NAME = ccu.Constraint_name

+ WHERE tc.TABLE_NAME = '{$table_name}'

+ AND tc.CONSTRAINT_TYPE = 'Primary Key'

+ AND ccu.COLUMN_NAME = '{$column_name}'";

+

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

+

+ while ($primary_key = $this->db->sql_fetchrow($result))

+ {

+ $statements[] = 'ALTER TABLE [' . $table_name . '] DROP CONSTRAINT [' . $primary_key['CONSTRAINT_NAME'] . ']';

+ }

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

+

+ return $statements;

+ }

+

+ /**

+ * Checks to see if column is an identity column

+ *

+ * Identity columns cannot have defaults set for them.

+ *

+ * @param string $table_name

+ * @param string $column_name

+ * @return bool true if identity, false if not

+ */

+ protected function mssql_is_column_identity($table_name, $column_name)

+ {

+ if ($this->mssql_is_sql_server_2000())

+ {

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

+ // Deprecated in SQL Server 2005

+ $sql = "SELECT COLUMNPROPERTY(object_id('{$table_name}'), '{$column_name}', 'IsIdentity') AS is_identity";

+ }

+ else

+ {

+ $sql = "SELECT is_identity FROM sys.columns

+ WHERE object_id = object_id('{$table_name}')

+ AND name = '{$column_name}'";

+ }

+

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

+ $is_identity = $this->db->sql_fetchfield('is_identity');

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

+

+ return (bool) $is_identity;

+ }

+

+ /**

+ * Get a list with existing indexes for the column

+ *

+ * @param string $table_name

+ * @param string $column_name

+ * @param bool $unique Should we get unique indexes or normal ones

+ * @return array Array with Index name => columns

+ */

+ public function get_existing_indexes($table_name, $column_name, $unique = false)

+ {

+ $existing_indexes = array();

+ if ($this->mssql_is_sql_server_2000())

+ {

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

+ // Deprecated in SQL Server 2005

+ $sql = "SELECT DISTINCT ix.name AS phpbb_index_name

+ FROM sysindexes ix

+ INNER JOIN sysindexkeys ixc

+ ON ixc.id = ix.id

+ AND ixc.indid = ix.indid

+ INNER JOIN syscolumns cols

+ ON cols.colid = ixc.colid

+ AND cols.id = ix.id

+ WHERE ix.id = object_id('{$table_name}')

+ AND cols.name = '{$column_name}'

+ AND INDEXPROPERTY(ix.id, ix.name, 'IsUnique') = " . ($unique ? '1' : '0');

+ }

+ else

+ {

+ $sql = "SELECT DISTINCT ix.name AS phpbb_index_name

+ FROM sys.indexes ix

+ INNER JOIN sys.index_columns ixc

+ ON ixc.object_id = ix.object_id

+ AND ixc.index_id = ix.index_id

+ INNER JOIN sys.columns cols

+ ON cols.column_id = ixc.column_id

+ AND cols.object_id = ix.object_id

+ WHERE ix.object_id = object_id('{$table_name}')

+ AND cols.name = '{$column_name}'

+ AND ix.is_primary_key = 0

+ AND ix.is_unique = " . ($unique ? '1' : '0');

+ }

+

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

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

+ {

+ if (!isset($row['is_unique']) || ($unique && $row['is_unique'] == 'UNIQUE') || (!$unique && $row['is_unique'] == 'NONUNIQUE'))

+ {

+ $existing_indexes[$row['phpbb_index_name']] = array();

+ }

+ }

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

+

+ if (empty($existing_indexes))

+ {

+ return array();

+ }

+

+ if ($this->mssql_is_sql_server_2000())

+ {

+ $sql = "SELECT DISTINCT ix.name AS phpbb_index_name, cols.name AS phpbb_column_name

+ FROM sysindexes ix

+ INNER JOIN sysindexkeys ixc

+ ON ixc.id = ix.id

+ AND ixc.indid = ix.indid

+ INNER JOIN syscolumns cols

+ ON cols.colid = ixc.colid

+ AND cols.id = ix.id

+ WHERE ix.id = object_id('{$table_name}')

+ AND " . $this->db->sql_in_set('ix.name', array_keys($existing_indexes));

+ }

+ else

+ {

+ $sql = "SELECT DISTINCT ix.name AS phpbb_index_name, cols.name AS phpbb_column_name

+ FROM sys.indexes ix

+ INNER JOIN sys.index_columns ixc

+ ON ixc.object_id = ix.object_id

+ AND ixc.index_id = ix.index_id

+ INNER JOIN sys.columns cols

+ ON cols.column_id = ixc.column_id

+ AND cols.object_id = ix.object_id

+ WHERE ix.object_id = object_id('{$table_name}')

+ AND " . $this->db->sql_in_set('ix.name', array_keys($existing_indexes));

+ }

+

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

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

+ {

+ $existing_indexes[$row['phpbb_index_name']][] = $row['phpbb_column_name'];

+ }

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

+

+ return $existing_indexes;

+ }

+

+ /**

+ * Is the used MS SQL Server a SQL Server 2000?

+ *

+ * @return bool

+ */

+ protected function mssql_is_sql_server_2000()

+ {

+ if ($this->is_sql_server_2000 === null)

+ {

+ $sql = "SELECT CAST(SERVERPROPERTY('productversion') AS VARCHAR(25)) AS mssql_version";

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

+ $properties = $this->db->sql_fetchrow($result);

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

+ $this->is_sql_server_2000 = $properties['mssql_version'][0] == '8';

+ }

+

+ return $this->is_sql_server_2000;

+ }

+

+}