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pgsql.php
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2001-03-10
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<?php
//
// +----------------------------------------------------------------------+
// | PHP version 4.0 |
// +----------------------------------------------------------------------+
// | Copyright (c) 1997-2001 The PHP Group |
// +----------------------------------------------------------------------+
// | This source file is subject to version 2.02 of the PHP license, |
// | that is bundled with this package in the file LICENSE, and is |
// | available at through the world-wide-web at |
// | http://www.php.net/license/2_02.txt. |
// | If you did not receive a copy of the PHP license and are unable to |
// | obtain it through the world-wide-web, please send a note to |
// | license@php.net so we can mail you a copy immediately. |
// +----------------------------------------------------------------------+
// | Authors: Rui Hirokawa <louis@cityfujisawa.ne.jp> |
// | Stig Bakken <ssb@fast.no> |
// +----------------------------------------------------------------------+
//
// Database independent query interface definition for PHP's PostgreSQL
// extension.
//
//
// XXX legend:
//
// XXX ERRORMSG: The error message from the pgsql function should
// be registered here.
//
require_once 'DB/common.php';
class DB_pgsql extends DB_common
{
// {{{ properties
var $connection;
var $phptype, $dbsyntax;
var $prepare_tokens = array();
var $prepare_types = array();
var $transaction_opcount = 0;
var $numrows;
var $row;
var $affected;
var $autocommit = true;
var $dsn;
// }}}
// {{{ constructor
function DB_pgsql()
{
$this->DB_common();
$this->phptype = 'pgsql';
$this->dbsyntax = 'pgsql';
$this->features = array(
'prepare' => false,
'pconnect' => true,
'transactions' => true
);
$this->errorcode_map = array(
);
$this->numrows = array();
$this->row = array();
$this->affected = 0;
}
// }}}
// {{{ connect()
/**
* Connect to a database and log in as the specified user.
*
* @param $dsn the data source name (see DB::parseDSN for syntax)
* @param $persistent (optional) whether the connection should
* be persistent
*
* @return int DB_OK on success, a DB error code on failure
*/
function connect($dsn, $persistent = false)
{
if (is_array($dsn)) {
$dsninfo = &$dsn;
} else {
$dsninfo = DB::parseDSN($dsn);
}
if (!$dsninfo || !$dsninfo['phptype']) {
return $this->raiseError(); // XXX ERRORMSG
}
$this->dsn = $dsninfo;
$dbhost = $dsninfo['hostspec'] ? $dsninfo['hostspec'] : 'unix';
if ($dbhost == 'unix') {
$protocol = 'unix';
} else {
$protocol = $dsninfo['protocol'] ? $dsninfo['protocol'] : 'tcp';
}
$user = $dsninfo['username'];
$pw = $dsninfo['password'];
$dbname = $dsninfo['database'];
$options = (!empty($dsninfo['options'])) ? $dsninfo['options'] : NULL;
$tty = (!empty($dsninfo['tty'])) ? $dsninfo['tty'] : NULL;
$port = (!empty($dsninfo['port'])) ? $dsninfo['port'] : '5432';
$connect_function = $persistent ? 'pg_pconnect' : 'pg_connect';
if (($protocol == 'unix') && $dbname) {
$connect_params = "dbname=$dbname";
if ($user) {
$connect_params .= " user=$user";
}
if ($pw) {
$connect_params .= " password=$pw";
}
$conn = @$connect_function($connect_params);
} elseif ($dbhost && $user && $pw && $dbname) {
$conn = @$connect_function(
"host=$dbhost port=$port dbname=$dbname user=$user password=$pw");
} elseif ($dbhost && $dbname && $options && $tty) {
$conn = @$connect_function($dbhost, $port, $options, $tty, $dbname);
} elseif ($dbhost && $dbname) {
$conn = @$connect_function($dbhost, $port, $dbname);
} else {
$conn = false;
}
if ($conn == false) {
return $this->raiseError(); // XXX ERRORMSG
}
$this->connection = $conn;
return DB_OK;
}
// }}}
// {{{ disconnect()
/**
* Log out and disconnect from the database.
*
* @return bool TRUE on success, FALSE if not connected.
*/
function disconnect()
{
return @pg_close($this->connection); // XXX ERRORMSG
}
// }}}
// {{{ simpleQuery()
/**
* Send a query to PostgreSQL and return the results as a
* PostgreSQL resource identifier.
*
* @param $query the SQL query
*
* @return int returns a valid PostgreSQL result for successful SELECT
* queries, DB_OK for other successful queries. A DB error code
* is returned on failure.
*/
function simpleQuery($query)
{
$ismanip = DB::isManip($query);
$this->last_query = $query;
$query = $this->modifyQuery($query);
if (!$this->autocommit && $ismanip) {
if ($this->transaction_opcount == 0) {
$result = @pg_exec($this->connection, "begin;");
if (!$result) {
return $this->pgsqlRaiseError();
}
}
$this->transaction_opcount++;
}
$result = @pg_exec($this->connection, $query);
if (!$result) {
return $this->pgsqlRaiseError();
}
// Determine which queries that should return data, and which
// should return an error code only.
if ($ismanip) {
$this->affected = @pg_cmdtuples($result);
return DB_OK;
} elseif (preg_match('/^\s*(SELECT)\s/i', $query) &&
!preg_match('/^\s*(SELECT\s+INTO)\s/i', $query)) {
/* PostgreSQL commands:
ABORT, ALTER, BEGIN, CLOSE, CLUSTER, COMMIT, COPY,
CREATE, DECLARE, DELETE, DROP TABLE, EXPLAIN, FETCH,
GRANT, INSERT, LISTEN, LOAD, LOCK, MOVE, NOTIFY, RESET,
REVOKE, ROLLBACK, SELECT, SELECT INTO, SET, SHOW,
UNLISTEN, UPDATE, VACUUM
*/
$this->row[$result] = 0; // reset the row counter.
$this->numrows[$result] = @pg_numrows($result);
$this->affected = 0;
return $result;
} else {
$this->affected = 0;
return DB_OK;
}
}
// }}}
// {{{ errorCode()
/**
* Map native error codes to DB's portable ones. Requires that
* the DB implementation's constructor fills in the $errorcode_map
* property.
*
* @param $nativecode the native error code, as returned by the backend
* database extension (string or integer)
*
* @return int a portable DB error code, or FALSE if this DB
* implementation has no mapping for the given error code.
*/
function errorCode($errormsg)
{
static $error_regexps;
if (empty($error_regexps)) {
$error_regexps = array(
'/(Table does not exist\.|Relation \'.*\' does not exist|sequence does not exist)$/' => DB_ERROR_NOSUCHTABLE,
'/Relation \'.*\' already exists/' => DB_ERROR_ALREADY_EXISTS,
'/divide by zero$/' => DB_ERROR_DIVZERO,
'/pg_atoi: error in .*: can\'t parse /' => DB_ERROR_INVALID_NUMBER,
'/attribute \'.*\' not found$/' => DB_ERROR_NOSUCHFIELD,
'/parser: parse error at or near \"/' => DB_ERROR_SYNTAX
);
}
foreach ($error_regexps as $regexp => $code) {
if (preg_match($regexp, $errormsg)) {
return $code;
}
}
//php_error(E_WARNING, get_class($this)."::errorCode: no mapping for $nativecode");
// Fall back to DB_ERROR if there was no mapping.
return DB_ERROR;
//return $errormsg;
}
// }}}
// {{{ fetchRow()
/**
* Fetch a row and return as array.
*
* @param $result PostgreSQL result identifier
* @param $fetchmode how the resulting array should be indexed
*
* @return int an array on success, a DB error code on failure, NULL
* if there is no more data
*/
function &fetchRow($result, $fetchmode = DB_FETCHMODE_DEFAULT)
{
if ($fetchmode == DB_FETCHMODE_DEFAULT) {
$fetchmode = $this->fetchmode;
}
if ($this->row[$result] >= $this->numrows[$result]) {
return NULL;
}
if ($fetchmode & DB_FETCHMODE_ASSOC) {
$row = @pg_fetch_array($result, $this->row[$result], PGSQL_ASSOC);
} else {
$row = @pg_fetch_row($result, $this->row[$result]);
}
if (!$row) {
$err = $this->pgsqlRaiseError();
if (!$err) {
return NULL;
}
return $err;
}
$this->row[$result]++;
return $row;
}
// }}}
// {{{ fetchInto()
/**
* Fetch a row and insert the data into an existing array.
*
* @param $result PostgreSQL result identifier
* @param $arr (reference) array where data from the row is stored
* @param $fetchmode how the array data should be indexed
*
* @return int DB_OK on success, a DB error code on failure
*/
function fetchInto($result, &$arr, $fetchmode = DB_FETCHMODE_DEFAULT)
{
if ($fetchmode == DB_FETCHMODE_DEFAULT) {
$fetchmode = $this->fetchmode;
}
if ($this->row[$result]>=$this->numrows[$result]){
return NULL;
}
if ($fetchmode & DB_FETCHMODE_ASSOC) {
$arr = @pg_fetch_array($result, $this->row[$result], PGSQL_ASSOC);
} else {
$arr = @pg_fetch_row($result, $this->row[$result]);
}
if (!$arr) {
/*
$errno = pg_errormessage($this->connection);
if (!$errno) {
return NULL;
}
return $errno;
*/
// the error codes are not supported in pgsql.
return $this->raiseError(DB_ERROR_NOT_CAPABLE); // XXX ERRORMSG
}
$this->row[$result]++;
return DB_OK;
}
// }}}
// {{{ freeResult()
/**
* Free the internal resources associated with $result.
*
* @param $result PostgreSQL result identifier or DB statement identifier
*
* @return bool TRUE on success, FALSE if $result is invalid
*/
function freeResult($result)
{
if (is_resource($result)) {
return @pg_freeresult($result);
}
if (!isset($this->prepare_tokens[$result])) {
return false;
}
unset($this->prepare_tokens[$result]);
unset($this->prepare_types[$result]);
unset($this->row[$result]);
unset($this->numrows[$result]);
$this->affected = 0;
return true;
}
// }}}
// {{{ numCols()
/**
* Get the number of columns in a result set.
*
* @param $result PostgreSQL result identifier
*
* @return int the number of columns per row in $result
*/
function numCols($result)
{
$cols = @pg_numfields($result);
if (!$cols) {
return $this->pgsqlRaiseError();
}
return $cols;
}
// }}}
// {{{ numRows()
/**
* Get the number of rows in a result set.
*
* @param $result PostgreSQL result identifier
*
* @return int the number of rows in $result
*/
function numRows($result)
{
$rows = @pg_numrows($result);
if ($rows === null) {
return $this->pgsqlRaiseError();
}
return $rows;
}
// }}}
// {{{ errorNative()
/**
* Get the native error code of the last error (if any) that
* occured on the current connection.
*
* @return int native PostgreSQL error code
*/
function errorNative()
{
return pg_errormessage($this->connection);
}
// }}}
// {{{ prepare()
/**
* Prepares a query for multiple execution with execute(). With
* PostgreSQL, this is emulated.
*/
function prepare($query)
{
$tokens = split('[\&\?]', $query);
$token = 0;
$types = array();
for ($i = 0; $i < strlen($query); $i++) {
switch ($query[$i]) {
case '?':
$types[$token++] = DB_PARAM_SCALAR;
break;
case '&':
$types[$token++] = DB_PARAM_OPAQUE;
break;
}
}
$this->prepare_tokens[] = &$tokens;
end($this->prepare_tokens);
$k = key($this->prepare_tokens);
$this->prepare_types[$k] = $types;
return $k;
}
// }}}
// {{{ execute()
/**
* @return mixed returns a DB result object for successful SELECT
* queries, DB_OK for other successful queries. A DB
* error is returned on failure.
*/
function execute($stmt, $data = false)
{
$realquery = $this->executeEmulateQuery($stmt, $data);
$result = $this->simpleQuery($realquery);
if (DB::isError($result) || $result === DB_OK) {
return $result;
} else {
return new DB_result($this, $result);
}
}
// }}}
// {{{ autoCommit()
/**
* Enable/disable automatic commits
*/
function autoCommit($onoff = false)
{
// XXX if $this->transaction_opcount > 0, we should probably
// issue a warning here.
$this->autocommit = $onoff ? true : false;
return DB_OK;
}
// }}}
// {{{ commit()
/**
* Commit the current transaction.
*/
function commit()
{
if ($this->transaction_opcount > 0) {
// (disabled) hack to shut up error messages from libpq.a
//@fclose(@fopen("php://stderr", "w"));
$result = @pg_exec($this->connection, "end;");
$this->transaction_opcount = 0;
if (!$result) {
return $this->pgsqlRaiseError();
}
}
return DB_OK;
}
// }}}
// {{{ rollback()
/**
* Roll back (undo) the current transaction.
*/
function rollback()
{
if ($this->transaction_opcount > 0) {
$result = @pg_exec($this->connection, "abort;");
$this->transaction_opcount = 0;
if (!$result) {
return $this->pgsqlRaiseError();
}
}
return DB_OK;
}
// }}}
// {{{ affectedRows()
/**
* Gets the number of rows affected by the last query.
* if the last query was a select, returns 0.
*
* @return number of rows affected by the last query or DB_ERROR
*/
function affectedRows()
{
$result = $this->affected;
if ($result === false) {
return $this->raiseError();
}
return $result;
}
// }}}
// {{{ nextId()
/**
* Get the next value in a sequence.
*
* We are using native PostgreSQL sequences. If a sequence does
* not exist, it will be created, unless $ondemand is false.
*
* @access public
* @param string $seq_name the name of the sequence
* @param bool $ondemand whether to create the sequence on demand
* @return a sequence integer, or a DB error
*/
function nextId($seq_name, $ondemand = true)
{
$sqn = preg_replace('/[^a-z0-9_]/i', '_', $seq_name);
$repeat = 0;
do {
$result = $this->query("SELECT NEXTVAL('${sqn}_seq')");
if ($ondemand && DB::isError($result) &&
$result->getCode() == DB_ERROR_NOSUCHTABLE) {
$repeat = 1;
$result = $this->createSequence($seq_name);
if (DB::isError($result)) {
return $result;
}
} else {
$repeat = 0;
}
} while ($repeat);
if (DB::isError($result)) {
return $result;
}
$arr = $result->fetchRow(DB_FETCHMODE_ORDERED);
$result->free();
return $arr[0];
}
// }}}
// {{{ createSequence()
/**
* Create the sequence
*
* @param string $seq_name the name of the sequence
* @return DB error
* @access public
*/
function createSequence($seq_name)
{
$sqn = preg_replace('/[^a-z0-9_]/i', '_', $seq_name);
return $this->query("CREATE SEQUENCE ${sqn}_seq");
}
// }}}
// {{{ dropSequence()
/**
* Drop a sequence
*
* @param string $seq_name the name of the sequence
* @return DB error
* @access public
*/
function dropSequence($seq_name)
{
$sqn = preg_replace('/[^a-z0-9_]/i', '_', $seq_name);
return $this->query("DROP SEQUENCE ${sqn}_seq");
}
// }}}
// {{{ pgsqlRaiseError()
function pgsqlRaiseError($errno = null)
{
if ($errno === null) {
return $this->raiseError($this->errorCode(pg_errormessage($this->connection)));
}
return $this->raiseError($this->errorCode($errno));
}
// }}}
}
// Local variables:
// tab-width: 4
// c-basic-offset: 4
// End:
?>