Pgsql.php

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<?php
#require_once 'Zend/Db/Adapter/Pdo/Abstract.php';


class Zend_Db_Adapter_Pdo_Pgsql extends Zend_Db_Adapter_Pdo_Abstract
{

    protected $_pdoType = 'pgsql';

    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
    );

    protected function _connect()
    {
        if ($this->_connection) {
            return;
        }

        parent::_connect();

        if (!empty($this->_config['charset'])) {
            $sql = "SET NAMES '" . $this->_config['charset'] . "'";
            $this->_connection->exec($sql);
        }
    }

    public function listTables()
    {
        // @todo use a better query with joins instead of subqueries
        $sql = "SELECT c.relname AS table_name "
             . "FROM pg_class c, pg_user u "
             . "WHERE c.relowner = u.usesysid AND c.relkind = 'r' "
             . "AND NOT EXISTS (SELECT 1 FROM pg_views WHERE viewname = c.relname) "
             . "AND c.relname !~ '^(pg_|sql_)' "
             . "UNION "
             . "SELECT c.relname AS table_name "
             . "FROM pg_class c "
             . "WHERE c.relkind = 'r' "
             . "AND NOT EXISTS (SELECT 1 FROM pg_views WHERE viewname = c.relname) "
             . "AND NOT EXISTS (SELECT 1 FROM pg_user WHERE usesysid = c.relowner) "
             . "AND c.relname !~ '^pg_'";

        return $this->fetchCol($sql);
    }

    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' || $row[$type] == 'bpchar' ) {
                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|bpchar)$/", $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;
    }


    public function limit($sql, $count, $offset = 0)
    {
        $count = intval($count);
        if ($count <= 0) {
            #require_once 'Zend/Db/Adapter/Exception.php';
            throw new Zend_Db_Adapter_Exception("LIMIT argument count=$count is not valid");
        }

        $offset = intval($offset);
        if ($offset < 0) {
            #require_once 'Zend/Db/Adapter/Exception.php';
            throw new Zend_Db_Adapter_Exception("LIMIT argument offset=$offset is not valid");
        }

        $sql .= " LIMIT $count";
        if ($offset > 0) {
            $sql .= " OFFSET $offset";
        }

        return $sql;
    }

    public function lastSequenceId($sequenceName)
    {
        $this->_connect();
        $sequenceName = str_replace($this->getQuoteIdentifierSymbol(), '', (string) $sequenceName);
        $value = $this->fetchOne("SELECT CURRVAL("
               . $this->quote($this->quoteIdentifier($sequenceName, true))
               . ")");
        return $value;
    }

    public function nextSequenceId($sequenceName)
    {
        $this->_connect();
        $sequenceName = str_replace($this->getQuoteIdentifierSymbol(), '', (string) $sequenceName);
        $value = $this->fetchOne("SELECT NEXTVAL("
               . $this->quote($this->quoteIdentifier($sequenceName, true))
               . ")");
        return $value;
    }

    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);
    }

}