pg_send_prepare()

(PHP 5 >= 5.1.0, PHP 7)

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.

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)