Php/docs/function.pg-send-prepare
pg_send_prepare
(PHP 5 >= 5.1.0, PHP 7)
pg_send_prepare — Sends a request to create a prepared statement with the given parameters, without waiting for completion
说明
pg_send_prepare
( resource $connection
, string $stmtname
, string $query
) : bool
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.
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)
