286 lines
7.0 KiB
PHP
286 lines
7.0 KiB
PHP
<?php
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// $Id$
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/**
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* @file
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* Database interface code for PostgreSQL database servers.
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*/
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/**
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* @ingroup database
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* @{
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*/
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/**
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* Initialize a database connection.
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*
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* Note that you can change the pg_connect() call to pg_pconnect() if you
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* want to use persistent connections. This is not recommended on shared hosts,
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* and might require additional database/webserver tuning. It can increase
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* performance, however, when the overhead to connect to your database is high
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* (e.g. your database and web server live on different machines).
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*/
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function db_connect($url) {
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$url = parse_url($url);
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$conn_string = ' user='. $url['user'] .' dbname='. substr($url['path'], 1) .' password='. $url['pass'];
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$connection = pg_connect($conn_string) or die(pg_last_error());
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return $connection;
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}
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/**
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* Runs a basic query in the active database.
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*
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* User-supplied arguments to the query should be passed in as separate parameters
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* so that they can be properly escaped to avoid SQL injection attacks.
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*
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* @param $query
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* A string containing an SQL query.
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* @param ...
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* A variable number of arguments which are substituted into the query using
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* printf() syntax.
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* @return
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* A database query result resource, or FALSE if the query was not executed
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* correctly.
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*/
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function db_query($query) {
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$args = func_get_args();
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$query = db_prefix_tables($query);
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if (count($args) > 1) {
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if(is_array($args[1])){
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$args1 = array_map('check_query', $args[1]);
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$nargs = array_merge(array($query), $args1);
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}
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else {
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$nargs = array_map('check_query', $args);
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$nargs[0] = $query;
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}
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return _db_query(call_user_func_array('sprintf', $nargs));
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}
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else {
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return _db_query($query);
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}
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}
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/**
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* Debugging version of db_query().
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*
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* Echoes the query to the browser.
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*/
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function db_queryd($query) {
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$args = func_get_args();
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$query = db_prefix_tables($query);
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if (count($args) > 1) {
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if(is_array($args[1])){
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$args1 = array_map('check_query', $args[1]);
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$nargs = array_merge(array($query), $args1);
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}
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else {
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$nargs = array_map('check_query', $args);
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$nargs[0] = $query;
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}
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return _db_query(call_user_func_array('sprintf', $nargs), 1);
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}
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else {
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return _db_query($query, 1);
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}
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}
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/**
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* Helper function for db_query().
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*/
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function _db_query($query, $debug = 0) {
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global $active_db, $last_result;
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global $queries;
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if (variable_get('dev_query', 0)) {
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list($usec, $sec) = explode(' ', microtime());
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$timer = (float)$usec + (float)$sec;
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}
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$last_result = pg_query($active_db, $query);
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if (variable_get('dev_query', 0)) {
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list($usec, $sec) = explode(' ', microtime());
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$stop = (float)$usec + (float)$sec;
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$diff = $stop - $timer;
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$queries[] = array($query, $diff);
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}
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if ($debug) {
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print '<p>query: '. $query .'<br />error:'. pg_last_error() .'</p>';
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}
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if ($last_result !== FALSE) {
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return $last_result;
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}
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else {
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trigger_error(pg_last_error() ."\nquery: ". htmlspecialchars($query), E_USER_ERROR);
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}
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}
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/**
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* Fetch one result row from the previous query as an object.
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*
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* @param $result
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* A database query result resource, as returned from db_query().
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* @return
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* An object representing the next row of the result. The attributes of this
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* object are the table fields selected by the query.
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*/
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function db_fetch_object($result) {
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if ($result) {
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return pg_fetch_object($result);
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}
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}
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/**
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* Fetch one result row from the previous query as an array.
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*
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* @param $result
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* A database query result resource, as returned from db_query().
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* @return
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* An associative array representing the next row of the result. The keys of
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* this object are the names of the table fields selected by the query, and
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* the values are the field values for this result row.
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*/
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function db_fetch_array($result) {
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if ($result) {
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return pg_fetch_assoc($result);
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}
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}
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/**
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* Determine how many result rows were found by the preceding query.
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*
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* @param $result
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* A database query result resource, as returned from db_query().
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* @return
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* The number of result rows.
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*/
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function db_num_rows($result) {
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if ($result) {
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return pg_num_rows($result);
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}
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}
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/**
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* Return an individual result field from the previous query.
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*
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* Only use this function if exactly one field is being selected; otherwise,
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* use db_fetch_object() or db_fetch_array().
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*
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* @param $result
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* A database query result resource, as returned from db_query().
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* @param $row
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* The index of the row whose result is needed.
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* @return
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* The resulting field.
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*/
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function db_result($result, $row = 0) {
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if ($result && pg_num_rows($result) > $row) {
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$res = pg_fetch_row($result, $row);
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return $res[0];
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}
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}
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/**
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* Determine whether the previous query caused an error.
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*/
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function db_error() {
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return pg_last_error();
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}
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/**
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* Return a new unique ID in the given sequence.
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*
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* For compatibility reasons, Drupal does not use auto-numbered fields in its
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* database tables. Instead, this function is used to return a new unique ID
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* of the type requested. If necessary, a new sequence with the given name
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* will be created.
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*/
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function db_next_id($name) {
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$id = db_result(db_query("SELECT nextval('public.%s_seq')", db_prefix_tables($name)));
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return $id;
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}
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/**
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* Determine the number of rows changed by the preceding query.
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*/
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function db_affected_rows() {
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global $last_result;
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return pg_affected_rows($last_result);
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}
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/**
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* Runs a limited-range query in the active database.
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*
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* Use this as a substitute for db_query() when a subset of the query is to be
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* returned.
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* User-supplied arguments to the query should be passed in as separate parameters
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* so that they can be properly escaped to avoid SQL injection attacks.
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*
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* @param $query
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* A string containing an SQL query.
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* @param ...
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* A variable number of arguments which are substituted into the query using
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* printf() syntax.
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* @param $from
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* The first result row to return.
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* @param $count
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* The maximum number of result rows to return.
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* @return
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* A database query result resource, or FALSE if the query was not executed
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* correctly.
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*/
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function db_query_range($query) {
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$args = func_get_args();
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$count = array_pop($args);
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$from = array_pop($args);
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if (count(func_get_args()) > 3) {
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$args = array_map('check_query', $args);
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$query = db_prefix_tables($query);
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$args[0] = $query;
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$query = call_user_func_array('sprintf', $args);
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}
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else {
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$query = func_get_arg(0);
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$query = db_prefix_tables($query);
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}
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$query .= ' LIMIT '. $count .' OFFSET '. $from;
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return _db_query($query);
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}
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/**
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* Returns a properly formatted Binary Large OBject value.
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*
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* @param $data
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* Data to encode.
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* @return
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* Encoded data.
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*/
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function db_encode_blob($data) {
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return pg_escape_bytea($data);
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}
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/**
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* Returns text from a Binary Large OBject value.
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*
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* @param $data
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* Data to decode.
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* @return
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* Decoded data.
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*/
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function db_decode_blob($data) {
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return stripcslashes($data);
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}
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/**
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* @} End of "ingroup database".
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*/
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?>
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