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- <?php
- //
- // +----------------------------------------------------------------------+
- // | PHP version 4.0 |
- // +----------------------------------------------------------------------+
- // | Copyright (c) 1997, 1998, 1999, 2000 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> |
- // | |
- // +----------------------------------------------------------------------+
- //
- // Database independent query interface definition for PHP's PostgreSQL
- // extension.
- //
- // [SSB] Problems in this code:
- //
- // 1. $this->row is used as a row counter
- // for the fetchRow() implementation. There are two problems with this:
- // First of all, $this->row is not reset when the result is freed. Also,
- // If the user creates two DB_result objects on the same DB connection,
- // it will break completely because both result sets will be using the
- // same row counter. Solution: change $this->row into an array indexed
- // by resource id.
- // --> $this->row is changed to an indexed array. (R.Hirokawa)
- //
- // 2. The pgsql extension currently does not have error codes. This
- // should be fixed so DB_pgsql can do portable error codes.
- // --> The error codes are not supported in the current pgsql API (libpq).
- //
- // 3. The transaction is supported by PostgreSQL,
- // but the current implementation is not useful to use the transaction.
-
-
- //
- // 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 $numrows;
- var $row;
-
- // }}}
-
- // {{{ constructor
-
- function DB_pgsql() {
- $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();
- }
-
- // }}}
-
- // {{{ 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
- }
- $dbhost = $dsninfo['hostspec'] ? $dsninfo['hostspec'] : 'localhost';
- $protocol = $dsninfo['protocol'] ? $dsninfo['protocol'] : 'tcp';
- $user = $dsninfo['username'];
- $pw = $dsninfo['password'];
- $dbname = $dsninfo['database'];
- $options = $dsninfo['options'];
- $tty = $dsninfo['tty'];
- $port = $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
- }
-
- // }}}
- // {{{ query()
-
-
- /**
- * Send a query to PostgreSQL and return the results as a DB_result object.
- *
- * @param $query the SQL query
- *
- * @return object a DB_result object on success, a DB error code
- * on failure
- */
- function &query($query) {
- $this->last_query = $query;
- $result = pg_exec($this->connection, $query);
- if (!$result) {
- return pg_errormessage($this->connection);
- }
- // Determine which queries that should return data, and which
- // should return an error code only.
- if (preg_match('/(SELECT|SHOW)/i', $query)) {
- $resultObj = new DB_result($this, $result);
- $this->row[$result] = 0; // reset the row counter.
- $this->numrows[$result] = pg_numrows($result);
- return $resultObj;
- } else {
- return DB_OK;
- }
- }
-
- // }}}
- // {{{ 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) {
- $this->last_query = $query;
- $result = pg_exec($this->connection, $query);
- if (!$result) {
- return pg_errormessage($this->connection);
- }
- // Determine which queries that should return data, and which
- // should return an error code only.
- if (preg_match('/(SELECT|SHOW)/i', $query)) {
- $this->row[$result] = 0; // reset the row counter.
- $this->numrows[$result] = pg_numrows($result);
- return $result;
- } else {
- return DB_OK;
- }
- }
-
- // }}}
- // {{{ 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]);
- } else {
- $row = pg_fetch_row($result, $this->row[$result]);
- }
- if (!$row) {
- $err = pg_errormessage($this->connection);
- 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]);
- } 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);
- }
- $this->row[$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]);
- 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 (!$cols) {
- return pg_errormessage($this->connection);
- }
- 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 (!$rows) {
- return pg_errormessage($this->connection);
- }
- 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); */
- // the error codes are not supported in pgsql.
- return $this->raiseError();
- }
-
- // }}}
- // {{{ prepare()
-
- /**
- * Prepares a query for multiple execution with execute(). With
- * PostgreSQL, this is emulated.
- */
- function prepare($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 $k;
- }
-
- // }}}
- // {{{ execute()
-
- /**
- * @return int returns a PostgreSQL result resource for successful
- * SELECT queries, DB_OK for other successful queries. A DB error
- * code is returned on failure.
- */
- function execute($stmt, $data = false) {
- $realquery = $this->execute_emulate_query($stmt, $data);
- $this->last_query = $realquery;
- $result = pg_exec($this->connection, $realquery);
- if (!$result) {
- return pg_errormessage($this->connection);
- }
- if (preg_match('/(SELECT|SHOW)/i', $realquery)) {
- $this->row[$result] = 0; // reset the row counter.
- $this->numrows[$result] = pg_numrows($result);
- return $result;
- } else {
- return DB_OK;
- }
- }
-
- // }}}
- // {{{ autoCommit()
-
- /**
- * Enable/disable automatic commits [not supported by PostgreSQL]
- */
- function autoCommit($onoff = false) {
- return $this->raiseError(DB_ERROR_NOT_CAPABLE);
- }
-
- // }}}
- // {{{ commit()
-
- /**
- * Commit transactions on the current connection
- */
- function commit() {
- $result = pg_exec($this->connection, "end;");
- if (!$result) {
- return pg_errormessage($this->connection);
- }
- return DB_OK;
- }
-
- // }}}
- // {{{ rollback()
-
- /**
- * Roll back all uncommitted transactions on the current connection.
- */
- function rollback() {
- $result = pg_exec($this->connection, "abort;");
- if (!$result) {
- return pg_errormessage($this->connection);
- }
- return DB_OK;
- }
-
- // }}}
-
- // TODO/wishlist:
- // simpleFetch
- // simpleGet
- // affectedRows
- // longReadlen
- // binmode
- }
-
- // Local variables:
- // tab-width: 4
- // c-basic-offset: 4
- // End:
- ?>
-