331 lines
12 KiB
PHP
331 lines
12 KiB
PHP
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<?php
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/**
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* Zend Framework
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*
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* LICENSE
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*
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* This source file is subject to the new BSD license that is bundled
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* with this package in the file LICENSE.txt.
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* It is also available through the world-wide-web at this URL:
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* http://framework.zend.com/license/new-bsd
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* If you did not receive a copy of the license and are unable to
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* obtain it through the world-wide-web, please send an email
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* to license@zend.com so we can send you a copy immediately.
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*
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* @category Zend
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* @package Zend_Db
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* @subpackage Adapter
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* @copyright Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
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* @license http://framework.zend.com/license/new-bsd New BSD License
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* @version $Id: Pgsql.php 18646 2009-10-18 13:16:21Z mikaelkael $
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*/
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/**
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* @see Zend_Db_Adapter_Pdo_Abstract
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*/
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require_once 'Zend/Db/Adapter/Pdo/Abstract.php';
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/**
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* Class for connecting to PostgreSQL databases and performing common operations.
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*
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* @category Zend
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* @package Zend_Db
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* @subpackage Adapter
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* @copyright Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
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* @license http://framework.zend.com/license/new-bsd New BSD License
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*/
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class Zend_Db_Adapter_Pdo_Pgsql extends Zend_Db_Adapter_Pdo_Abstract
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{
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/**
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* PDO type.
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*
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* @var string
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*/
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protected $_pdoType = 'pgsql';
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/**
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* Keys are UPPERCASE SQL datatypes or the constants
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* Zend_Db::INT_TYPE, Zend_Db::BIGINT_TYPE, or Zend_Db::FLOAT_TYPE.
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*
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* Values are:
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* 0 = 32-bit integer
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* 1 = 64-bit integer
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* 2 = float or decimal
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*
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* @var array Associative array of datatypes to values 0, 1, or 2.
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*/
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protected $_numericDataTypes = array(
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Zend_Db::INT_TYPE => Zend_Db::INT_TYPE,
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Zend_Db::BIGINT_TYPE => Zend_Db::BIGINT_TYPE,
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Zend_Db::FLOAT_TYPE => Zend_Db::FLOAT_TYPE,
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'INTEGER' => Zend_Db::INT_TYPE,
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'SERIAL' => Zend_Db::INT_TYPE,
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'SMALLINT' => Zend_Db::INT_TYPE,
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'BIGINT' => Zend_Db::BIGINT_TYPE,
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'BIGSERIAL' => Zend_Db::BIGINT_TYPE,
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'DECIMAL' => Zend_Db::FLOAT_TYPE,
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'DOUBLE PRECISION' => Zend_Db::FLOAT_TYPE,
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'NUMERIC' => Zend_Db::FLOAT_TYPE,
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'REAL' => Zend_Db::FLOAT_TYPE
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);
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/**
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* Creates a PDO object and connects to the database.
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*
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* @return void
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* @throws Zend_Db_Adapter_Exception
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*/
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protected function _connect()
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{
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if ($this->_connection) {
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return;
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}
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parent::_connect();
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if (!empty($this->_config['charset'])) {
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$sql = "SET NAMES '" . $this->_config['charset'] . "'";
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$this->_connection->exec($sql);
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}
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}
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/**
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* Returns a list of the tables in the database.
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*
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* @return array
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*/
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public function listTables()
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{
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// @todo use a better query with joins instead of subqueries
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$sql = "SELECT c.relname AS table_name "
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. "FROM pg_class c, pg_user u "
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. "WHERE c.relowner = u.usesysid AND c.relkind = 'r' "
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. "AND NOT EXISTS (SELECT 1 FROM pg_views WHERE viewname = c.relname) "
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. "AND c.relname !~ '^(pg_|sql_)' "
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. "UNION "
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. "SELECT c.relname AS table_name "
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. "FROM pg_class c "
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. "WHERE c.relkind = 'r' "
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. "AND NOT EXISTS (SELECT 1 FROM pg_views WHERE viewname = c.relname) "
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. "AND NOT EXISTS (SELECT 1 FROM pg_user WHERE usesysid = c.relowner) "
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. "AND c.relname !~ '^pg_'";
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return $this->fetchCol($sql);
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}
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/**
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* Returns the column descriptions for a table.
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*
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* The return value is an associative array keyed by the column name,
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* as returned by the RDBMS.
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*
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* The value of each array element is an associative array
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* with the following keys:
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*
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* SCHEMA_NAME => string; name of database or schema
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* TABLE_NAME => string;
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* COLUMN_NAME => string; column name
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* COLUMN_POSITION => number; ordinal position of column in table
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* DATA_TYPE => string; SQL datatype name of column
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* DEFAULT => string; default expression of column, null if none
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* NULLABLE => boolean; true if column can have nulls
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* LENGTH => number; length of CHAR/VARCHAR
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* SCALE => number; scale of NUMERIC/DECIMAL
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* PRECISION => number; precision of NUMERIC/DECIMAL
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* UNSIGNED => boolean; unsigned property of an integer type
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* PRIMARY => boolean; true if column is part of the primary key
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* PRIMARY_POSITION => integer; position of column in primary key
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* IDENTITY => integer; true if column is auto-generated with unique values
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*
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* @todo Discover integer unsigned property.
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*
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* @param string $tableName
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* @param string $schemaName OPTIONAL
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* @return array
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*/
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public function describeTable($tableName, $schemaName = null)
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{
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$sql = "SELECT
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a.attnum,
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n.nspname,
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c.relname,
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a.attname AS colname,
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t.typname AS type,
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a.atttypmod,
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FORMAT_TYPE(a.atttypid, a.atttypmod) AS complete_type,
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d.adsrc AS default_value,
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a.attnotnull AS notnull,
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a.attlen AS length,
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co.contype,
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ARRAY_TO_STRING(co.conkey, ',') AS conkey
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FROM pg_attribute AS a
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JOIN pg_class AS c ON a.attrelid = c.oid
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JOIN pg_namespace AS n ON c.relnamespace = n.oid
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JOIN pg_type AS t ON a.atttypid = t.oid
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LEFT OUTER JOIN pg_constraint AS co ON (co.conrelid = c.oid
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AND a.attnum = ANY(co.conkey) AND co.contype = 'p')
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LEFT OUTER JOIN pg_attrdef AS d ON d.adrelid = c.oid AND d.adnum = a.attnum
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WHERE a.attnum > 0 AND c.relname = ".$this->quote($tableName);
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if ($schemaName) {
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$sql .= " AND n.nspname = ".$this->quote($schemaName);
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}
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$sql .= ' ORDER BY a.attnum';
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$stmt = $this->query($sql);
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// Use FETCH_NUM so we are not dependent on the CASE attribute of the PDO connection
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$result = $stmt->fetchAll(Zend_Db::FETCH_NUM);
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$attnum = 0;
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$nspname = 1;
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$relname = 2;
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$colname = 3;
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$type = 4;
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$atttypemod = 5;
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$complete_type = 6;
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$default_value = 7;
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$notnull = 8;
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$length = 9;
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$contype = 10;
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$conkey = 11;
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$desc = array();
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foreach ($result as $key => $row) {
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$defaultValue = $row[$default_value];
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if ($row[$type] == 'varchar') {
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if (preg_match('/character varying(?:\((\d+)\))?/', $row[$complete_type], $matches)) {
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if (isset($matches[1])) {
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$row[$length] = $matches[1];
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} else {
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$row[$length] = null; // unlimited
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}
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}
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if (preg_match("/^'(.*?)'::character varying$/", $defaultValue, $matches)) {
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$defaultValue = $matches[1];
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}
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}
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list($primary, $primaryPosition, $identity) = array(false, null, false);
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if ($row[$contype] == 'p') {
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$primary = true;
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$primaryPosition = array_search($row[$attnum], explode(',', $row[$conkey])) + 1;
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$identity = (bool) (preg_match('/^nextval/', $row[$default_value]));
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}
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$desc[$this->foldCase($row[$colname])] = array(
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'SCHEMA_NAME' => $this->foldCase($row[$nspname]),
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'TABLE_NAME' => $this->foldCase($row[$relname]),
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'COLUMN_NAME' => $this->foldCase($row[$colname]),
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'COLUMN_POSITION' => $row[$attnum],
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'DATA_TYPE' => $row[$type],
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'DEFAULT' => $defaultValue,
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'NULLABLE' => (bool) ($row[$notnull] != 't'),
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'LENGTH' => $row[$length],
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'SCALE' => null, // @todo
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'PRECISION' => null, // @todo
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'UNSIGNED' => null, // @todo
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'PRIMARY' => $primary,
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'PRIMARY_POSITION' => $primaryPosition,
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'IDENTITY' => $identity
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);
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}
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return $desc;
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}
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/**
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* Adds an adapter-specific LIMIT clause to the SELECT statement.
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*
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* @param string $sql
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* @param integer $count
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* @param integer $offset OPTIONAL
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* @return string
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*/
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public function limit($sql, $count, $offset = 0)
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{
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$count = intval($count);
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if ($count <= 0) {
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/**
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* @see Zend_Db_Adapter_Exception
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*/
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require_once 'Zend/Db/Adapter/Exception.php';
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throw new Zend_Db_Adapter_Exception("LIMIT argument count=$count is not valid");
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}
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$offset = intval($offset);
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if ($offset < 0) {
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/**
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* @see Zend_Db_Adapter_Exception
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*/
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require_once 'Zend/Db/Adapter/Exception.php';
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throw new Zend_Db_Adapter_Exception("LIMIT argument offset=$offset is not valid");
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}
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$sql .= " LIMIT $count";
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if ($offset > 0) {
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$sql .= " OFFSET $offset";
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}
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return $sql;
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}
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/**
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* Return the most recent value from the specified sequence in the database.
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* This is supported only on RDBMS brands that support sequences
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* (e.g. Oracle, PostgreSQL, DB2). Other RDBMS brands return null.
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*
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* @param string $sequenceName
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* @return string
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*/
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public function lastSequenceId($sequenceName)
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{
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$this->_connect();
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$value = $this->fetchOne("SELECT CURRVAL(".$this->quote($sequenceName).")");
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return $value;
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}
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/**
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* Generate a new value from the specified sequence in the database, and return it.
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* This is supported only on RDBMS brands that support sequences
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* (e.g. Oracle, PostgreSQL, DB2). Other RDBMS brands return null.
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*
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* @param string $sequenceName
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* @return string
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*/
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public function nextSequenceId($sequenceName)
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{
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$this->_connect();
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$value = $this->fetchOne("SELECT NEXTVAL(".$this->quote($sequenceName).")");
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return $value;
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}
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/**
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* Gets the last ID generated automatically by an IDENTITY/AUTOINCREMENT column.
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*
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* As a convention, on RDBMS brands that support sequences
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* (e.g. Oracle, PostgreSQL, DB2), this method forms the name of a sequence
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* from the arguments and returns the last id generated by that sequence.
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* On RDBMS brands that support IDENTITY/AUTOINCREMENT columns, this method
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* returns the last value generated for such a column, and the table name
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* argument is disregarded.
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*
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* @param string $tableName OPTIONAL Name of table.
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* @param string $primaryKey OPTIONAL Name of primary key column.
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* @return string
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*/
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public function lastInsertId($tableName = null, $primaryKey = null)
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{
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if ($tableName !== null) {
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$sequenceName = $tableName;
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if ($primaryKey) {
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$sequenceName .= "_$primaryKey";
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}
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$sequenceName .= '_seq';
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return $this->lastSequenceId($sequenceName);
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}
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return $this->_connection->lastInsertId($tableName);
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}
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}
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