pg_query_params

(PHP 5 >= 5.1.0)

pg_query_params — Submits a command to the server and waits for the result, with the ability to pass parameters separately from the SQL command text.

Description

resource pg_query_params ( resource $connection , string $query , array $params )

resource pg_query_params ( string $query , array $params )

Submits a command to the server and waits for the result, with the ability to pass parameters separately from the SQL command text.

pg_query_params() is like pg_query(), but offers additional functionality: parameter values can be specified separately from the command string proper. pg_query_params() is supported only against PostgreSQL 7.4 or higher connections; it will fail when using earlier versions.

If parameters are used, they are referred to in the query string as $1, $2, etc. params specifies the actual values of the parameters. A NULL value in this array means the corresponding parameter is SQL NULL.

The primary advantage of pg_query_params() over pg_query() is that parameter values may be separated from the query string, thus avoiding the need for tedious and error-prone quoting and escaping. Unlike pg_query(), pg_query_params() allows at most one SQL command in the given string. (There can be semicolons in it, but not more than one nonempty command.)

Parameters

connection: PostgreSQL database connection resource. When connection is not present, the default connection is used. The default connection is the last connection made by pg_connect() or pg_pconnect().
query: The parameterised SQL statement. Must contain only a single statement. (multiple statements separated by semi-colons are not allowed.) If any parameters are used, they are referred to as $1, $2, etc.
params: An array of parameter values to substitute for the $1, $2, etc. placeholders in the original prepared query string. The number of elements in the array must match the number of placeholders.

Return Values

A query result resource on success, or FALSE on failure.

Examples

Example #1 Using pg_query_params()


<?php
// Connect to a database named "mary"
$dbconn = pg_connect("dbname=mary");

// Find all shops named Joe's Widgets.  Note that it is not necessary to
// escape "Joe's Widgets"
$result = pg_query_params($dbconn, 'SELECT * FROM shops WHERE name = $1', array("Joe's Widgets"));

// Compare against just using pg_query
$str = pg_escape_string("Joe's Widgets");
$result = pg_query($dbconn, "SELECT * FROM shops WHERE name = '{$str}'");

?>

pg_query_params

Description

Parameters

Return Values

Examples

See Also