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# pg_query_params

(PHP 5 >= 5.1.0RC1)

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.

## �d��

範例 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}'");
?>`

## �Ѧ�

pg_query()

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