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# pg_query

(PHP 4 >= 4.2.0, PHP 5)

pg_query -- Execute a query

## Description

resource pg_query ( string query )
resource pg_query ( resource connection, string query )

pg_query() executes the query on the specified database connection.

If an error occurs, and `FALSE` is returned, details of the error can be retrieved using the pg_last_error() function if the connection is valid.

> 注: Although connection can be omitted, it is not recommended, since it can be the cause of hard to find bugs in scripts.

> 注: This function used to be called pg_exec(). pg_exec() is still available for compatibility reasons, but users are encouraged to use the newer name.

## 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 SQL statement or statements to be executed. When multiple statements are passed to the function, they are automatically executed as one transaction, unless there are explicit BEGIN/COMMIT commands included in the query string. However, using multiple transactions in one function call is not recommended.

## Return Values

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

## �d��

範例 1. pg_query() example

`<?php $conn = pg_pconnect("dbname=publisher"); if (!$conn) { echo "An error occured.\n"; exit; } $result = pg_query($conn, "SELECT author, email FROM authors"); if (!$result) { echo "An error occured.\n"; exit; } while ($row = pg_fetch_row($result)) { echo "Author: $row[0] E-mail: $row[1]"; echo "<br />\n"; } ?>`

範例 2. Using pg_query() with multiple statements

`<?php $conn = pg_pconnect("dbname=publisher"); // these statements will be executed as one transaction $query = "UPDATE authors SET author=UPPER(author) WHERE id=1;"; $query .= "UPDATE authors SET author=LOWER(author) WHERE id=2;"; $query .= "UPDATE authors SET author=NULL WHERE id=3;"; pg_query($conn, $query); ?>`

## �Ѧ�

pg_connect()
pg_pconnect()
pg_fetch_array()
pg_fetch_object()
pg_num_rows()
pg_affected_rows()

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