pg_send_prepare
(PHP 5 >= 5.1.0)
pg_send_prepare — Sends a request to create a prepared statement with the given parameters, without waiting for completion.
说明
$connection
, string $stmtname
, string $query
)Sends a request to create a prepared statement with the given parameters, without waiting for completion.
This is an asynchronous version of pg_prepare() : it returns TRUE if it was able to
dispatch the request, and FALSE if not. After a successful call, call
pg_get_result() to determine whether the server successfully created the
prepared statement. The function's parameters are handled identically to
pg_prepare() . Like pg_prepare() , it will not work
on pre-7.4 versions of PostgreSQL.
参数
-
connection -
PostgreSQL database connection resource. When
connectionis not present, the default connection is used. The default connection is the last connection made by pg_connect() or pg_pconnect() . -
stmtname -
The name to give the prepared statement. Must be unique per-connection. If "" is specified, then an unnamed statement is created, overwriting any previously defined unnamed statement.
-
query -
The parameterized 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.
返回值
Returns TRUE on success, FALSE on failure. Use pg_get_result()
to determine the query result.
范例
Example #1 Using pg_send_prepare()
<?php
$dbconn = pg_connect ( "dbname=publisher" ) or die( "Could not connect" );
// Prepare a query for execution
if (! pg_connection_busy ( $dbconn )) {
pg_send_prepare ( $dbconn , "my_query" , 'SELECT * FROM shops WHERE name = $1' );
$res1 = pg_get_result ( $dbconn );
}
// Execute the prepared query. Note that it is not necessary to escape
// the string "Joe's Widgets" in any way
if (! pg_connection_busy ( $dbconn )) {
pg_send_execute ( $dbconn , "my_query" , array( "Joe's Widgets" ));
$res2 = pg_get_result ( $dbconn );
}
// Execute the same prepared query, this time with a different parameter
if (! pg_connection_busy ( $dbconn )) {
pg_send_execute ( $dbconn , "my_query" , array( "Clothes Clothes Clothes" ));
$res3 = pg_get_result ( $dbconn );
}
?> 参见
- pg_connect() - 打开一个 PostgreSQL 连接
- pg_pconnect() - 打开一个持久的 PostgreSQL 连接
- pg_execute() - Sends a request to execute a prepared statement with given parameters, and waits for the result.
- pg_send_execute() - Sends a request to execute a prepared statement with given parameters, without waiting for the result(s).
- pg_send_query_params() - Submits a command and separate parameters to the server without waiting for the result(s).