Search moodle.org's
Developer Documentation

See Release Notes

  • Bug fixes for general core bugs in 4.3.x will end 7 October 2024 (12 months).
  • Bug fixes for security issues in 4.3.x will end 21 April 2025 (18 months).
  • PHP version: minimum PHP 8.0.0 Note: minimum PHP version has increased since Moodle 4.1. PHP 8.2.x is supported too.
<?php
/**
 * Data Dictionary for PostgreSQL.
 *
 * This file is part of ADOdb, a Database Abstraction Layer library for PHP.
 *
 * @package ADOdb
 * @link https://adodb.org Project's web site and documentation
 * @link https://github.com/ADOdb/ADOdb Source code and issue tracker
 *
 * The ADOdb Library is dual-licensed, released under both the BSD 3-Clause
 * and the GNU Lesser General Public Licence (LGPL) v2.1 or, at your option,
 * any later version. This means you can use it in proprietary products.
 * See the LICENSE.md file distributed with this source code for details.
 * @license BSD-3-Clause
 * @license LGPL-2.1-or-later
 *
 * @copyright 2000-2013 John Lim
 * @copyright 2014 Damien Regad, Mark Newnham and the ADOdb community
 */

// security - hide paths
if (!defined('ADODB_DIR')) die();

class ADODB2_postgres extends ADODB_DataDict
{
	var $databaseType = 'postgres';
	var $seqField = false;
	var $seqPrefix = 'SEQ_';
	var $addCol = ' ADD COLUMN';
	var $quote = '"';
	var $renameTable = 'ALTER TABLE %s RENAME TO %s'; // at least since 7.1
	var $dropTable = 'DROP TABLE %s CASCADE';

	public $blobAllowsDefaultValue = true;
	public $blobAllowsNotNull = true;

	function metaType($t, $len=-1, $fieldobj=false)
	{
		if (is_object($t)) {
			$fieldobj = $t;
			$t = $fieldobj->type;
			$len = $fieldobj->max_length;
		}

		$t = strtoupper($t);

		if (array_key_exists($t,$this->connection->customActualTypes))
			return  $this->connection->customActualTypes[$t];

		$is_serial = is_object($fieldobj) && !empty($fieldobj->primary_key) && !empty($fieldobj->unique) &&
			!empty($fieldobj->has_default) && substr($fieldobj->default_value,0,8) == 'nextval(';

		switch ($t) {

			case 'INTERVAL':
			case 'CHAR':
			case 'CHARACTER':
			case 'VARCHAR':
			case 'NAME':
			case 'BPCHAR':
				if ($len <= $this->blobSize) return 'C';

			case 'TEXT':
				return 'X';

			case 'IMAGE': // user defined type
			case 'BLOB': // user defined type
			case 'BIT':	// This is a bit string, not a single bit, so don't return 'L'
			case 'VARBIT':
			case 'BYTEA':
				return 'B';

			case 'BOOL':
			case 'BOOLEAN':
				return 'L';

			case 'DATE':
				return 'D';

			case 'TIME':
			case 'DATETIME':
			case 'TIMESTAMP':
			case 'TIMESTAMPTZ':
				return 'T';

			case 'INTEGER': return !$is_serial ? 'I' : 'R';
			case 'SMALLINT':
			case 'INT2': return !$is_serial ? 'I2' : 'R';
			case 'INT4': return !$is_serial ? 'I4' : 'R';
			case 'BIGINT':
			case 'INT8': return !$is_serial ? 'I8' : 'R';

			case 'OID':
			case 'SERIAL':
				return 'R';

			case 'FLOAT4':
			case 'FLOAT8':
			case 'DOUBLE PRECISION':
			case 'REAL':
				return 'F';

			default:
				return ADODB_DEFAULT_METATYPE;
		}
	}

	function actualType($meta)
	{
		$meta = strtoupper($meta);

		/*
		* Add support for custom meta types. We do this
		* first, that allows us to override existing types
		*/
		if (isset($this->connection->customMetaTypes[$meta]))
			return $this->connection->customMetaTypes[$meta]['actual'];

		switch ($meta) {
		case 'C': return 'VARCHAR';
		case 'XL':
		case 'X': return 'TEXT';

		case 'C2': return 'VARCHAR';
		case 'X2': return 'TEXT';

		case 'B': return 'BYTEA';

		case 'D': return 'DATE';
		case 'TS':
		case 'T': return 'TIMESTAMP';

		case 'L': return 'BOOLEAN';
		case 'I': return 'INTEGER';
		case 'I1': return 'SMALLINT';
		case 'I2': return 'INT2';
		case 'I4': return 'INT4';
		case 'I8': return 'INT8';

		case 'F': return 'FLOAT8';
		case 'N': return 'NUMERIC';
		default:
			return $meta;
		}
	}

	/**
	 * Adding a new Column
	 *
	 * reimplementation of the default function as postgres does NOT allow to set the default in the same statement
	 *
	 * @param string $tabname table-name
	 * @param string $flds column-names and types for the changed columns
	 * @return array with SQL strings
	 */
	function addColumnSQL($tabname, $flds)
	{
		$tabname = $this->tableName($tabname);
		$sql = array();
		$not_null = false;
		list($lines,$pkey) = $this->_genFields($flds);
< $alter = 'ALTER TABLE ' . $tabname . $this->addCol . ' ';
> $alter = 'ALTER TABLE ' . $tabname . $this->addCol; > $alter .= (float)@$this->serverInfo['version'] < 9.6 ? ' ' : ' IF NOT EXISTS ';
foreach($lines as $v) { if (($not_null = preg_match('/NOT NULL/i',$v))) { $v = preg_replace('/NOT NULL/i','',$v); } if (preg_match('/^([^ ]+) .*DEFAULT (\'[^\']+\'|\"[^\"]+\"|[^ ]+)/',$v,$matches)) { list(,$colname,$default) = $matches; $sql[] = $alter . str_replace('DEFAULT '.$default,'',$v); $sql[] = 'UPDATE '.$tabname.' SET '.$colname.'='.$default.' WHERE '.$colname.' IS NULL '; $sql[] = 'ALTER TABLE '.$tabname.' ALTER COLUMN '.$colname.' SET DEFAULT ' . $default; } else { $sql[] = $alter . $v; } if ($not_null) { list($colname) = explode(' ',$v); $sql[] = 'ALTER TABLE '.$tabname.' ALTER COLUMN '.$colname.' SET NOT NULL'; } } return $sql; } function dropIndexSQL($idxname, $tabname = NULL) { return array(sprintf($this->dropIndex, $this->tableName($idxname), $this->tableName($tabname))); } /** * Change the definition of one column * * Postgres can't do that on its own, you need to supply the complete * definition of the new table, to allow recreating the table and copying * the content over to the new table. * * @param string $tabname table-name * @param string $flds column-name and type for the changed column * @param string $tableflds complete definition of the new table, e.g. for postgres, default '' * @param array $tableoptions options for the new table {@see CreateTableSQL()}, default '' * * @return array with SQL strings */ function alterColumnSQL($tabname, $flds, $tableflds='', $tableoptions='') { // Check if alter single column datatype available - works with 8.0+ $has_alter_column = 8.0 <= (float) @$this->serverInfo['version']; if ($has_alter_column) { $tabname = $this->tableName($tabname); $sql = array(); list($lines,$pkey) = $this->_genFields($flds); $set_null = false; foreach($lines as $v) { $alter = 'ALTER TABLE ' . $tabname . $this->alterCol . ' '; if ($not_null = preg_match('/NOT NULL/i',$v)) { $v = preg_replace('/NOT NULL/i','',$v); } // this next block doesn't work - there is no way that I can see to // explicitly ask a column to be null using $flds elseif ($set_null = preg_match('/NULL/i',$v)) { // if they didn't specify not null, see if they explicitly asked for null // Lookbehind pattern covers the case 'fieldname NULL datatype DEFAULT NULL' // only the first NULL should be removed, not the one specifying // the default value $v = preg_replace('/(?<!DEFAULT)\sNULL/i','',$v); } if (preg_match('/^([^ ]+) .*DEFAULT (\'[^\']+\'|\"[^\"]+\"|[^ ]+)/',$v,$matches)) { $existing = $this->metaColumns($tabname); list(,$colname,$default) = $matches; $alter .= $colname; if ($this->connection) { $old_coltype = $this->connection->metaType($existing[strtoupper($colname)]); } else { $old_coltype = $t; } $v = preg_replace('/^' . preg_quote($colname) . '\s/', '', $v); $t = trim(str_replace('DEFAULT '.$default,'',$v)); // Type change from bool to int if ( $old_coltype == 'L' && $t == 'INTEGER' ) { $sql[] = $alter . ' DROP DEFAULT'; $sql[] = $alter . " TYPE $t USING ($colname::BOOL)::INT"; $sql[] = $alter . " SET DEFAULT $default"; } // Type change from int to bool else if ( $old_coltype == 'I' && $t == 'BOOLEAN' ) { if( strcasecmp('NULL', trim($default)) != 0 ) { $default = $this->connection->qstr($default); } $sql[] = $alter . ' DROP DEFAULT'; $sql[] = $alter . " TYPE $t USING CASE WHEN $colname = 0 THEN false ELSE true END"; $sql[] = $alter . " SET DEFAULT $default"; } // Any other column types conversion else { $sql[] = $alter . " TYPE $t"; $sql[] = $alter . " SET DEFAULT $default"; } } else { // drop default? preg_match ('/^\s*(\S+)\s+(.*)$/',$v,$matches); list (,$colname,$rest) = $matches; $alter .= $colname; $sql[] = $alter . ' TYPE ' . $rest; } #list($colname) = explode(' ',$v); if ($not_null) { // this does not error out if the column is already not null $sql[] = $alter . ' SET NOT NULL'; } if ($set_null) { // this does not error out if the column is already null $sql[] = $alter . ' DROP NOT NULL'; } } return $sql; } // does not have alter column if (!$tableflds) { if ($this->debug) ADOConnection::outp("AlterColumnSQL needs a complete table-definiton for PostgreSQL"); return array(); } return $this->_recreate_copy_table($tabname, false, $tableflds,$tableoptions); } /** * Drop one column * * Postgres < 7.3 can't do that on it's own, you need to supply the complete definition of the new table, * to allow, recreating the table and copying the content over to the new table * @param string $tabname table-name * @param string $flds column-name and type for the changed column * @param string $tableflds complete definition of the new table, eg. for postgres, default '' * @param array $tableoptions options for the new table {@see CreateTableSQL}, default [] * @return array with SQL strings */ function dropColumnSQL($tabname, $flds, $tableflds='', $tableoptions='') { $has_drop_column = 7.3 <= (float) @$this->serverInfo['version']; if (!$has_drop_column && !$tableflds) { if ($this->debug) { ADOConnection::outp("dropColumnSQL needs complete table-definiton for PostgreSQL < 7.3"); } return array(); } if ($has_drop_column) { return ADODB_DataDict::dropColumnSQL($tabname, $flds); } return $this->_recreate_copy_table($tabname, $flds, $tableflds, $tableoptions); } /** * Save the content into a temp. table, drop and recreate the original table and copy the content back in * * We also take care to set the values of the sequenz and recreate the indexes. * All this is done in a transaction, to not loose the content of the table, if something went wrong! * @internal * @param string $tabname table-name * @param string $dropflds column-names to drop * @param string $tableflds complete definition of the new table, eg. for postgres * @param array|string $tableoptions options for the new table see CreateTableSQL, default '' * @return array with SQL strings */ function _recreate_copy_table($tabname, $dropflds, $tableflds, $tableoptions='') { if ($dropflds && !is_array($dropflds)) $dropflds = explode(',',$dropflds); $copyflds = array(); foreach($this->metaColumns($tabname) as $fld) { if (preg_match('/'.$fld->name.' (\w+)/i', $tableflds, $matches)) { $new_type = strtoupper($matches[1]); // AlterColumn of a char column to a nummeric one needs an explicit conversation if (in_array($new_type, array('I', 'I2', 'I4', 'I8', 'N', 'F')) && in_array($fld->type, array('varchar','char','text','bytea')) ) { $copyflds[] = "to_number($fld->name,'S9999999999999D99')"; } else { // other column-type changes needs explicit decode, encode for bytea or cast otherwise $new_actual_type = $this->actualType($new_type); if (strtoupper($fld->type) != $new_actual_type) { if ($new_actual_type == 'BYTEA' && $fld->type == 'text') { $copyflds[] = "DECODE($fld->name, 'escape')"; } elseif ($fld->type == 'bytea' && $new_actual_type == 'TEXT') { $copyflds[] = "ENCODE($fld->name, 'escape')"; } else { $copyflds[] = "CAST($fld->name AS $new_actual_type)"; } } } } else { $copyflds[] = $fld->name; } // identify the sequence name and the fld its on if ($fld->primary_key && $fld->has_default && preg_match("/nextval\('([^']+)'::(text|regclass)\)/", $fld->default_value, $matches)) { $seq_name = $matches[1]; $seq_fld = $fld->name; } } $copyflds = implode(', ', $copyflds); $tempname = $tabname.'_tmp'; $aSql[] = 'BEGIN'; // we use a transaction, to make sure not to loose the content of the table $aSql[] = "SELECT * INTO TEMPORARY TABLE $tempname FROM $tabname"; $aSql = array_merge($aSql,$this->dropTableSQL($tabname)); $aSql = array_merge($aSql,$this->createTableSQL($tabname, $tableflds, $tableoptions)); $aSql[] = "INSERT INTO $tabname SELECT $copyflds FROM $tempname"; if ($seq_name && $seq_fld) { // if we have a sequence we need to set it again $seq_name = $tabname.'_'.$seq_fld.'_seq'; // has to be the name of the new implicit sequence $aSql[] = "SELECT setval('$seq_name', MAX($seq_fld)) FROM $tabname"; } $aSql[] = "DROP TABLE $tempname"; // recreate the indexes, if they not contain one of the dropped columns foreach($this->metaIndexes($tabname) as $idx_name => $idx_data) { if (substr($idx_name,-5) != '_pkey' && (!$dropflds || !count(array_intersect($dropflds,$idx_data['columns'])))) { $aSql = array_merge($aSql,$this->createIndexSQL($idx_name, $tabname, $idx_data['columns'], $idx_data['unique'] ? array('UNIQUE') : false)); } } $aSql[] = 'COMMIT'; return $aSql; } function dropTableSQL($tabname) { $sql = ADODB_DataDict::dropTableSQL($tabname); $drop_seq = $this->_dropAutoIncrement($tabname); if ($drop_seq) { $sql[] = $drop_seq; } return $sql; } // return string must begin with space function _createSuffix($fname, &$ftype, $fnotnull, $fdefault, $fautoinc, $fconstraint, $funsigned) { if ($fautoinc) { $ftype = 'SERIAL'; return ''; } $suffix = ''; if (strlen($fdefault)) $suffix .= " DEFAULT $fdefault"; if ($fnotnull) $suffix .= ' NOT NULL'; if ($fconstraint) $suffix .= ' '.$fconstraint; return $suffix; } // search for a sequence for the given table (asumes the seqence-name contains the table-name!) // if yes return sql to drop it // this is still necessary if postgres < 7.3 or the SERIAL was created on an earlier version!!! function _dropAutoIncrement($tabname) { $tabname = $this->connection->quote('%'.$tabname.'%'); $seq = $this->connection->getOne("SELECT relname FROM pg_class WHERE NOT relname ~ 'pg_.*' AND relname LIKE $tabname AND relkind='S'"); // check if a tables depends on the sequence and it therefore can't and don't need to be dropped separately if (!$seq || $this->connection->getOne("SELECT relname FROM pg_class JOIN pg_depend ON pg_class.relfilenode=pg_depend.objid WHERE relname='$seq' AND relkind='S' AND deptype='i'")) { return false; } return "DROP SEQUENCE ".$seq; } function renameTableSQL($tabname, $newname) { if (!empty($this->schema)) { $rename_from = $this->tableName($tabname); $schema_save = $this->schema; $this->schema = false; $rename_to = $this->tableName($newname); $this->schema = $schema_save; return array (sprintf($this->renameTable, $rename_from, $rename_to)); } return array (sprintf($this->renameTable, $this->tableName($tabname), $this->tableName($newname))); } /* CREATE [ [ LOCAL ] { TEMPORARY | TEMP } ] TABLE table_name ( { column_name data_type [ DEFAULT default_expr ] [ column_constraint [, ... ] ] | table_constraint } [, ... ] ) [ INHERITS ( parent_table [, ... ] ) ] [ WITH OIDS | WITHOUT OIDS ] where column_constraint is: [ CONSTRAINT constraint_name ] { NOT NULL | NULL | UNIQUE | PRIMARY KEY | CHECK (expression) | REFERENCES reftable [ ( refcolumn ) ] [ MATCH FULL | MATCH PARTIAL ] [ ON DELETE action ] [ ON UPDATE action ] } [ DEFERRABLE | NOT DEFERRABLE ] [ INITIALLY DEFERRED | INITIALLY IMMEDIATE ] and table_constraint is: [ CONSTRAINT constraint_name ] { UNIQUE ( column_name [, ... ] ) | PRIMARY KEY ( column_name [, ... ] ) | CHECK ( expression ) | FOREIGN KEY ( column_name [, ... ] ) REFERENCES reftable [ ( refcolumn [, ... ] ) ] [ MATCH FULL | MATCH PARTIAL ] [ ON DELETE action ] [ ON UPDATE action ] } [ DEFERRABLE | NOT DEFERRABLE ] [ INITIALLY DEFERRED | INITIALLY IMMEDIATE ] */ /* CREATE [ UNIQUE ] INDEX index_name ON table [ USING acc_method ] ( column [ ops_name ] [, ...] ) [ WHERE predicate ] CREATE [ UNIQUE ] INDEX index_name ON table [ USING acc_method ] ( func_name( column [, ... ]) [ ops_name ] ) [ WHERE predicate ] */ function _indexSQL($idxname, $tabname, $flds, $idxoptions) { $sql = array(); if ( isset($idxoptions['REPLACE']) || isset($idxoptions['DROP']) ) { $sql[] = sprintf ($this->dropIndex, $idxname, $tabname); if ( isset($idxoptions['DROP']) ) { return $sql; } } if (empty($flds)) { return $sql; } $unique = isset($idxoptions['UNIQUE']) ? ' UNIQUE' : ''; $s = 'CREATE' . $unique . ' INDEX ' . $idxname . ' ON ' . $tabname . ' '; if (isset($idxoptions['HASH'])) { $s .= 'USING HASH '; } if (isset($idxoptions[$this->upperName])) { $s .= $idxoptions[$this->upperName]; } if (is_array($flds)) { $flds = implode(', ', $flds); } $s .= '(' . $flds . ')'; $sql[] = $s; return $sql; } function _getSize($ftype, $ty, $fsize, $fprec, $options=false) { if (strlen($fsize) && $ty != 'X' && $ty != 'B' && $ty != 'I' && strpos($ftype,'(') === false) { $ftype .= "(".$fsize; if (strlen($fprec)) $ftype .= ",".$fprec; $ftype .= ')'; } /* * Handle additional options */ if (is_array($options)) { foreach($options as $type=>$value) { switch ($type) { case 'ENUM': $ftype .= '(' . $value . ')'; break; default: } } } return $ftype; } function changeTableSQL($tablename, $flds, $tableoptions = false, $dropOldFlds=false) { global $ADODB_FETCH_MODE; parent::changeTableSQL($tablename, $flds); $save = $ADODB_FETCH_MODE; $ADODB_FETCH_MODE = ADODB_FETCH_ASSOC; if ($this->connection->fetchMode !== false) { $savem = $this->connection->setFetchMode(false); } // check table exists $save_handler = $this->connection->raiseErrorFn; $this->connection->raiseErrorFn = ''; $cols = $this->metaColumns($tablename); $this->connection->raiseErrorFn = $save_handler; if (isset($savem)) { $this->connection->setFetchMode($savem); } $ADODB_FETCH_MODE = $save; $sqlResult=array(); if ( empty($cols)) { $sqlResult=$this->createTableSQL($tablename, $flds, $tableoptions); } else { $sqlResultAdd = $this->addColumnSQL($tablename, $flds); $sqlResultAlter = $this->alterColumnSQL($tablename, $flds, '', $tableoptions); $sqlResult = array_merge((array)$sqlResultAdd, (array)$sqlResultAlter); if ($dropOldFlds) { // already exists, alter table instead list($lines,$pkey,$idxs) = $this->_genFields($flds); // genfields can return FALSE at times if ($lines == null) { $lines = array(); } $alter = 'ALTER TABLE ' . $this->tableName($tablename); foreach ( $cols as $id => $v ) { if ( !isset($lines[$id]) ) { $sqlResult[] = $alter . $this->dropCol . ' ' . $v->name; } } } } return $sqlResult; } } // end class