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<?php
/**
* Zend Framework
*
* LICENSE
*
* This source file is subject to the new BSD license that is bundled
* with this package in the file LICENSE.txt.
* It is also available through the world-wide-web at this URL:
* http://framework.zend.com/license/new-bsd
* If you did not receive a copy of the license and are unable to
* obtain it through the world-wide-web, please send an email
* to license@zend.com so we can send you a copy immediately.
*
* @category Zend
* @package Zend_Db
* @subpackage Adapter
* @copyright Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
* @version $Id: Pgsql.php 19051 2009-11-19 18:27:53Z mikaelkael $
*/
/**
* @see Zend_Db_Adapter_Pdo_Abstract
*/
require_once 'Zend/Db/Adapter/Pdo/Abstract.php';
/**
* Class for connecting to PostgreSQL databases and performing common operations.
*
* @category Zend
* @package Zend_Db
* @subpackage Adapter
* @copyright Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
*/
class Zend_Db_Adapter_Pdo_Pgsql extends Zend_Db_Adapter_Pdo_Abstract
{
/**
* PDO type.
*
* @var string
*/
protected $_pdoType = 'pgsql';
/**
* Keys are UPPERCASE SQL datatypes or the constants
* Zend_Db::INT_TYPE, Zend_Db::BIGINT_TYPE, or Zend_Db::FLOAT_TYPE.
*
* Values are:
* 0 = 32-bit integer
* 1 = 64-bit integer
* 2 = float or decimal
*
* @var array Associative array of datatypes to values 0, 1, or 2.
*/
protected $_numericDataTypes = array(
Zend_Db::INT_TYPE => Zend_Db::INT_TYPE,
Zend_Db::BIGINT_TYPE => Zend_Db::BIGINT_TYPE,
Zend_Db::FLOAT_TYPE => Zend_Db::FLOAT_TYPE,
'INTEGER' => Zend_Db::INT_TYPE,
'SERIAL' => Zend_Db::INT_TYPE,
'SMALLINT' => Zend_Db::INT_TYPE,
'BIGINT' => Zend_Db::BIGINT_TYPE,
'BIGSERIAL' => Zend_Db::BIGINT_TYPE,
'DECIMAL' => Zend_Db::FLOAT_TYPE,
'DOUBLE PRECISION' => Zend_Db::FLOAT_TYPE,
'NUMERIC' => Zend_Db::FLOAT_TYPE,
'REAL' => Zend_Db::FLOAT_TYPE
);
/**
* Creates a PDO object and connects to the database.
*
* @return void
* @throws Zend_Db_Adapter_Exception
*/
protected function _connect()
{
if ($this->_connection) {
return;
}
parent::_connect();
if (!empty($this->_config['charset'])) {
$sql = "SET NAMES '" . $this->_config['charset'] . "'";
$this->_connection->exec($sql);
}
}
/**
* Returns a list of the tables in the database.
*
* @return array
*/
public function listTables()
{
$sql = "SELECT c.relname AS table_name "
. "FROM pg_catalog.pg_class c "
. "JOIN pg_catalog.pg_roles r ON r.oid = c.relowner "
. "LEFT JOIN pg_catalog.pg_namespace n ON n.oid = c.relnamespace "
. "WHERE n.nspname <> 'pg_catalog' "
. "AND n.nspname !~ '^pg_toast' "
. "AND pg_catalog.pg_table_is_visible(c.oid) "
. "AND c.relkind = 'r' ";
return $this->fetchCol($sql);
}
/**
* Returns the column descriptions for a table.
*
* The return value is an associative array keyed by the column name,
* as returned by the RDBMS.
*
* The value of each array element is an associative array
* with the following keys:
*
* SCHEMA_NAME => string; name of database or schema
* TABLE_NAME => string;
* COLUMN_NAME => string; column name
* COLUMN_POSITION => number; ordinal position of column in table
* DATA_TYPE => string; SQL datatype name of column
* DEFAULT => string; default expression of column, null if none
* NULLABLE => boolean; true if column can have nulls
* LENGTH => number; length of CHAR/VARCHAR
* SCALE => number; scale of NUMERIC/DECIMAL
* PRECISION => number; precision of NUMERIC/DECIMAL
* UNSIGNED => boolean; unsigned property of an integer type
* PRIMARY => boolean; true if column is part of the primary key
* PRIMARY_POSITION => integer; position of column in primary key
* IDENTITY => integer; true if column is auto-generated with unique values
*
* @todo Discover integer unsigned property.
*
* @param string $tableName
* @param string $schemaName OPTIONAL
* @return array
*/
public function describeTable($tableName, $schemaName = null)
{
$sql = "SELECT
a.attnum,
n.nspname,
c.relname,
a.attname AS colname,
t.typname AS type,
a.atttypmod,
FORMAT_TYPE(a.atttypid, a.atttypmod) AS complete_type,
d.adsrc AS default_value,
a.attnotnull AS notnull,
a.attlen AS length,
co.contype,
ARRAY_TO_STRING(co.conkey, ',') AS conkey
FROM pg_attribute AS a
JOIN pg_class AS c ON a.attrelid = c.oid
JOIN pg_namespace AS n ON c.relnamespace = n.oid
JOIN pg_type AS t ON a.atttypid = t.oid
LEFT OUTER JOIN pg_constraint AS co ON (co.conrelid = c.oid
AND a.attnum = ANY(co.conkey) AND co.contype = 'p')
LEFT OUTER JOIN pg_attrdef AS d ON d.adrelid = c.oid AND d.adnum = a.attnum
WHERE a.attnum > 0 AND c.relname = ".$this->quote($tableName);
if ($schemaName) {
$sql .= " AND n.nspname = ".$this->quote($schemaName);
}
$sql .= ' ORDER BY a.attnum';
$stmt = $this->query($sql);
// Use FETCH_NUM so we are not dependent on the CASE attribute of the PDO connection
$result = $stmt->fetchAll(Zend_Db::FETCH_NUM);
$attnum = 0;
$nspname = 1;
$relname = 2;
$colname = 3;
$type = 4;
$atttypemod = 5;
$complete_type = 6;
$default_value = 7;
$notnull = 8;
$length = 9;
$contype = 10;
$conkey = 11;
$desc = array();
foreach ($result as $key => $row) {
$defaultValue = $row[$default_value];
if ($row[$type] == 'varchar') {
if (preg_match('/character varying(?:\((\d+)\))?/', $row[$complete_type], $matches)) {
if (isset($matches[1])) {
$row[$length] = $matches[1];
} else {
$row[$length] = null; // unlimited
}
}
if (preg_match("/^'(.*?)'::character varying$/", $defaultValue, $matches)) {
$defaultValue = $matches[1];
}
}
list($primary, $primaryPosition, $identity) = array(false, null, false);
if ($row[$contype] == 'p') {
$primary = true;
$primaryPosition = array_search($row[$attnum], explode(',', $row[$conkey])) + 1;
$identity = (bool) (preg_match('/^nextval/', $row[$default_value]));
}
$desc[$this->foldCase($row[$colname])] = array(
'SCHEMA_NAME' => $this->foldCase($row[$nspname]),
'TABLE_NAME' => $this->foldCase($row[$relname]),
'COLUMN_NAME' => $this->foldCase($row[$colname]),
'COLUMN_POSITION' => $row[$attnum],
'DATA_TYPE' => $row[$type],
'DEFAULT' => $defaultValue,
'NULLABLE' => (bool) ($row[$notnull] != 't'),
'LENGTH' => $row[$length],
'SCALE' => null, // @todo
'PRECISION' => null, // @todo
'UNSIGNED' => null, // @todo
'PRIMARY' => $primary,
'PRIMARY_POSITION' => $primaryPosition,
'IDENTITY' => $identity
);
}
return $desc;
}
/**
* Adds an adapter-specific LIMIT clause to the SELECT statement.
*
* @param string $sql
* @param integer $count
* @param integer $offset OPTIONAL
* @return string
*/
public function limit($sql, $count, $offset = 0)
{
$count = intval($count);
if ($count <= 0) {
/**
* @see Zend_Db_Adapter_Exception
*/
require_once 'Zend/Db/Adapter/Exception.php';
throw new Zend_Db_Adapter_Exception("LIMIT argument count=$count is not valid");
}
$offset = intval($offset);
if ($offset < 0) {
/**
* @see Zend_Db_Adapter_Exception
*/
require_once 'Zend/Db/Adapter/Exception.php';
throw new Zend_Db_Adapter_Exception("LIMIT argument offset=$offset is not valid");
}
$sql .= " LIMIT $count";
if ($offset > 0) {
$sql .= " OFFSET $offset";
}
return $sql;
}
/**
* Return the most recent value from the specified sequence in the database.
* This is supported only on RDBMS brands that support sequences
* (e.g. Oracle, PostgreSQL, DB2). Other RDBMS brands return null.
*
* @param string $sequenceName
* @return string
*/
public function lastSequenceId($sequenceName)
{
$this->_connect();
$value = $this->fetchOne("SELECT CURRVAL(".$this->quote($sequenceName).")");
return $value;
}
/**
* Generate a new value from the specified sequence in the database, and return it.
* This is supported only on RDBMS brands that support sequences
* (e.g. Oracle, PostgreSQL, DB2). Other RDBMS brands return null.
*
* @param string $sequenceName
* @return string
*/
public function nextSequenceId($sequenceName)
{
$this->_connect();
$value = $this->fetchOne("SELECT NEXTVAL(".$this->quote($sequenceName).")");
return $value;
}
/**
* Gets the last ID generated automatically by an IDENTITY/AUTOINCREMENT column.
*
* As a convention, on RDBMS brands that support sequences
* (e.g. Oracle, PostgreSQL, DB2), this method forms the name of a sequence
* from the arguments and returns the last id generated by that sequence.
* On RDBMS brands that support IDENTITY/AUTOINCREMENT columns, this method
* returns the last value generated for such a column, and the table name
* argument is disregarded.
*
* @param string $tableName OPTIONAL Name of table.
* @param string $primaryKey OPTIONAL Name of primary key column.
* @return string
*/
public function lastInsertId($tableName = null, $primaryKey = null)
{
if ($tableName !== null) {
$sequenceName = $tableName;
if ($primaryKey) {
$sequenceName .= "_$primaryKey";
}
$sequenceName .= '_seq';
return $this->lastSequenceId($sequenceName);
}
return $this->_connection->lastInsertId($tableName);
}
}
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