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+<?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 postgres extends tools
+{
+ /**
+ * Get the column types for postgres only
+ *
+ * @return array
+ */
+ public static function get_dbms_type_map()
+ {
+ return array(
+ 'postgres' => array(
+ 'INT:' => 'INT4',
+ 'BINT' => 'INT8',
+ 'ULINT' => 'INT4', // unsigned
+ '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',
+ ),
+ );
+ }
+
+ /**
+ * 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
+ $this->sql_layer = 'postgres';
+
+ $this->dbms_type_map = self::get_dbms_type_map();
+ }
+
+ /**
+ * {@inheritDoc}
+ */
+ function sql_list_tables()
+ {
+ $sql = 'SELECT relname
+ FROM pg_stat_user_tables';
+ $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 ' . $table_name . ' (' . "\n";
+
+ // Iterate through the columns to create a table
+ foreach ($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} " . $prepared_column['column_type_sql'];
+
+ // see if we have found a primary key set due to a column definition if we have found it, we can stop looking
+ if (!$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", $columns);
+
+ // we have yet to create a primary key for this table,
+ // this means that we can add the one we really wanted instead
+ if (!$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']);
+ }
+
+ $table_sql .= ",\n\t PRIMARY KEY (" . implode(', ', $table_data['PRIMARY_KEY']) . ')';
+ }
+ }
+
+ // do we need to add a sequence for auto incrementing columns?
+ if ($create_sequence)
+ {
+ $statements[] = "CREATE SEQUENCE {$table_name}_seq;";
+ }
+
+ // close the table
+ $table_sql .= "\n);";
+ $statements[] = $table_sql;
+
+ // Write Keys
+ if (isset($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();
+
+ $sql = "SELECT a.attname
+ FROM pg_class c, pg_attribute a
+ WHERE c.relname = '{$table_name}'
+ AND a.attnum > 0
+ AND a.attrelid = c.oid";
+ $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 = "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')";
+ $result = $this->db->sql_query($sql);
+
+ while ($row = $this->db->sql_fetchrow($result))
+ {
+ // This DBMS prefixes index names with the table name
+ $row['index_name'] = $this->strip_table_name_from_index_name($table_name, $row['index_name']);
+
+ if (strtolower($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 = "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')";
+ $result = $this->db->sql_query($sql);
+
+ while ($row = $this->db->sql_fetchrow($result))
+ {
+ if ($row['indisunique'] != 't')
+ {
+ continue;
+ }
+
+ // This DBMS prefixes index names with the table name
+ $row['index_name'] = $this->strip_table_name_from_index_name($table_name, $row['index_name']);
+
+ if (strtolower($row['index_name']) == strtolower($index_name))
+ {
+ $this->db->sql_freeresult($result);
+ return true;
+ }
+ }
+ $this->db->sql_freeresult($result);
+
+ return false;
+ }
+
+ /**
+ * 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
+ list($column_type, $orig_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'];
+ }
+
+ $sql = " {$column_type} ";
+
+ $return_array = array(
+ 'column_type' => $column_type,
+ 'auto_increment' => false,
+ );
+
+ if (isset($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';
+ $sql .= 'NOT NULL ';
+ }
+ else
+ {
+ // Integers need to have 0 instead of empty string as default
+ if (strpos($column_type, 'INT') === 0)
+ {
+ $default_val = '0';
+ }
+ else
+ {
+ $default_val = "'" . $column_data[1] . "'";
+ }
+ $return_array['null'] = 'NULL';
+ $sql .= '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)";
+ }
+
+ $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);
+ $statements = array();
+
+ // Does not support AFTER, only through temporary table
+ if (version_compare($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'];
+ }
+ }
+
+ return $this->_sql_run_sql($statements);
+ }
+
+ /**
+ * {@inheritDoc}
+ */
+ function sql_column_remove($table_name, $column_name, $inline = false)
+ {
+ $statements = array();
+
+ $statements[] = 'ALTER TABLE ' . $table_name . ' DROP COLUMN "' . $column_name . '"';
+
+ 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;
+
+ // 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))
+ {
+ $statements[] = "DROP SEQUENCE IF EXISTS {$table_name}_seq;\n";
+ }
+ $this->db->sql_freeresult($result);
+
+ return $this->_sql_run_sql($statements);
+ }
+
+ /**
+ * {@inheritDoc}
+ */
+ function sql_create_primary_key($table_name, $column, $inline = false)
+ {
+ $statements = array();
+
+ $statements[] = 'ALTER TABLE ' . $table_name . ' ADD PRIMARY KEY (' . implode(', ', $column) . ')';
+
+ return $this->_sql_run_sql($statements);
+ }
+
+ /**
+ * {@inheritDoc}
+ */
+ function sql_create_unique_index($table_name, $index_name, $column)
+ {
+ $statements = array();
+
+ $this->check_index_name_length($table_name, $index_name);
+
+ $statements[] = 'CREATE UNIQUE INDEX ' . $table_name . '_' . $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 ' . $table_name . '_' . $index_name . ' ON ' . $table_name . '(' . implode(', ', $column) . ')';
+
+ return $this->_sql_run_sql($statements);
+ }
+
+
+ /**
+ * {@inheritDoc}
+ */
+ function sql_list_index($table_name)
+ {
+ $index_array = array();
+
+ $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')";
+ $result = $this->db->sql_query($sql);
+
+ while ($row = $this->db->sql_fetchrow($result))
+ {
+ $row['index_name'] = $this->strip_table_name_from_index_name($table_name, $row['index_name']);
+
+ $index_array[] = $row['index_name'];
+ }
+ $this->db->sql_freeresult($result);
+
+ return array_map('strtolower', $index_array);
+ }
+
+ /**
+ * {@inheritDoc}
+ */
+ function sql_column_change($table_name, $column_name, $column_data, $inline = false)
+ {
+ $column_data = $this->sql_prepare_column_data($table_name, $column_name, $column_data);
+ $statements = array();
+
+ $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;
+
+ return $this->_sql_run_sql($statements);
+ }
+
+ /**
+ * 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)
+ {
+ // Not supported
+ throw new \Exception('DBMS is not supported');
+ }
+}