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

+ * @var bool

+ */

+ protected $is_sql_server_2000;

+

+ /**

+ 'sqlite3' => array(

+ 'INT:' => 'INT(%d)',

+ 'BINT' => 'BIGINT(20)',

+ 'UINT' => 'INTEGER UNSIGNED',

+ 'UINT:' => 'INTEGER UNSIGNED',

+ 'TINT:' => 'TINYINT(%d)',

+ 'USINT' => 'INTEGER UNSIGNED',

+ 'BOOL' => 'INTEGER 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',

+ ),

+

+ var $supported_dbms = array('firebird', 'mssql', 'mssqlnative', 'mysql_40', 'mysql_41', 'oracle', 'postgres', 'sqlite', 'sqlite3');

+ case 'sqlite3':

+ $sql = 'SELECT name

+ FROM sqlite_master

+ WHERE type = "table"

+ AND name <> "sqlite_sequence"';

+ break;

+

+ case 'sqlite3':

+ case 'sqlite3':

+ if (($this->db->sql_layer == 'sqlite' || $this->db->sql_layer == 'sqlite3') && $this->return_statements)

+ case 'sqlite3':

+ case 'sqlite3':

+ case 'sqlite3':

+ case 'sqlite3':

+ if (($this->sql_layer == 'sqlite' || $this->sql_layer == 'sqlite3') && !$row['unique'])

+ case 'sqlite3':

+ case 'sqlite3':

+

+ if ($this->sql_layer === 'sqlite3')

+ {

+ $sql .= ' AUTOINCREMENT';

+ }

+ $recreate_queries = $this->sqlite_get_recreate_table_queries($table_name);

+ if (empty($recreate_queries))

+ break;

+ }

+ $statements[] = 'begin';

+ $sql_create_table = array_shift($recreate_queries);

+ // 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', $sql_create_table);

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

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

+ preg_match('#\((.*)\)#s', $sql_create_table, $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 . ');';

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

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

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

+

+ $statements[] = 'commit';

+ break;

+

+ case 'sqlite3':

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

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

+

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

+ // We need the data here

+ $old_return_statements = $this->return_statements;

+ $this->return_statements = true;

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

+ // 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 (sizeof($index_data) > 1)

+ {

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

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

+ }

+ // Drop default value constraint

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

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

+

+ // Remove the column

+

+ 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;

+ case 'sqlite3':

+ $recreate_queries = $this->sqlite_get_recreate_table_queries($table_name, $column_name);

+ if (empty($recreate_queries))

+ break;

+ }

+ $statements[] = 'begin';

+ $sql_create_table = array_shift($recreate_queries);

+ // 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', $sql_create_table);

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

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

+ preg_match('#\((.*)\)#s', $sql_create_table, $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 = trim(preg_replace('/' . $column_name . '[^,]+(?:,|$)/m', '', $new_table_cols));

+ if (substr($new_table_cols, -1) === ',')

+ // Remove the comma from the last entry again

+ $new_table_cols = substr($new_table_cols, 0, -1);

+

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

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

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

+

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

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

+

+ $statements[] = 'commit';

+ case 'sqlite3':

+ case 'sqlite3':

+ $recreate_queries = $this->sqlite_get_recreate_table_queries($table_name);

+ if (empty($recreate_queries))

+ $sql_create_table = array_shift($recreate_queries);

+

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

+ preg_match('#\((.*)\)#s', $sql_create_table, $matches);

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

+

+ case 'sqlite3':

+ case 'sqlite3':

+ case 'sqlite3':

+ case 'sqlite3':

+ // We need the data here

+ $old_return_statements = $this->return_statements;

+ $this->return_statements = true;

+

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

+

+ // Drop any indexes

+ if (!empty($indexes))

+ {

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

+ {

+ $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

+ // Add new default value constraint

+ $statements[] = 'ALTER TABLE [' . $table_name . '] ADD CONSTRAINT [DF_' . $table_name . '_' . $column_name . '_1] ' . $this->db->sql_escape($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);

+

+ $this->return_statements = $old_return_statements;

+ case 'sqlite3':

+ $recreate_queries = $this->sqlite_get_recreate_table_queries($table_name);

+ if (empty($recreate_queries))

+ $sql_create_table = array_shift($recreate_queries);

+

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

+ preg_match('#\((.*)\)#s', $sql_create_table, $matches);

+ // Create a new table and fill it up. destroy the temp one

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

+

+

+ /**

+ * 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 a list with existing indexes for the column

+ *

+ * @param string $table_name

+ * @param string $column_name

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

+ */

+ protected function mssql_get_existing_indexes($table_name, $column_name)

+ {

+ $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}'";

+ }

+ 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}'";

+ }

+

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

+ $existing_indexes = array();

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

+ {

+ $existing_indexes[$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;

+ }

+

+ /**

+ * Returns the Queries which are required to recreate a table including indexes

+ *

+ * @param string $table_name

+ * @param string $remove_column When we drop a column, we remove the column

+ * from all indexes. If the index has no other

+ * column, we drop it completly.

+ * @return array

+ */

+ protected function sqlite_get_recreate_table_queries($table_name, $remove_column = '')

+ {

+ $queries = array();

+

+ $sql = "SELECT sql

+ FROM sqlite_master

+ WHERE type = 'table'

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

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

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

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

+

+ if (!$sql_create_table)

+ {

+ return array();

+ }

+ $queries[] = $sql_create_table;

+

+ $sql = "SELECT sql

+ FROM sqlite_master

+ WHERE type = 'index'

+ AND tbl_name = '{$table_name}'";

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

+ while ($sql_create_index = $this->db->sql_fetchfield('sql'))

+ {

+ if ($remove_column)

+ {

+ $match = array();

+ preg_match('#(?:[\w ]+)\((.*)\)#', $sql_create_index, $match);

+ if (!isset($match[1]))

+ {

+ continue;

+ }

+

+ // Find and remove $remove_column from the index

+ $columns = explode(', ', $match[1]);

+ $found_column = array_search($remove_column, $columns);

+ if ($found_column !== false)

+ {

+ unset($columns[$found_column]);

+

+ // If the column list is not empty add the index to the list

+ if (!empty($columns))

+ {

+ $queries[] = str_replace($match[1], implode(', ', $columns), $sql_create_index);

+ }

+ }

+ else

+ {

+ $queries[] = $sql_create_index;

+ }

+ }

+ else

+ {

+ $queries[] = $sql_create_index;

+ }

+ }

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

+

+ return $queries;

+ }