Php/docs/function.sqlsrv-cancel
sqlsrv_cancel
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sqlsrv_cancel — Cancels a statement
说明
sqlsrv_cancel
( resource $stmt
) : bool
Cancels a statement. Any results associated with the statement that have not been consumed are deleted. After sqlsrv_cancel() has been called, the specified statement can be re-executed if it was created with sqlsrv_prepare(). Calling sqlsrv_cancel() is not necessary if all the results associated with the statement have been consumed.
参数
stmt- The statement resource to be cancelled.
返回值
成功时返回 true， 或者在失败时返回 false。
范例
Example #1 sqlsrv_cancel() example
<?php$serverName = "serverName\sqlexpress";$connectionInfo = array( "Database"=>"dbName", "UID"=>"username", "PWD"=>"password");$conn = sqlsrv_connect( $serverName, $connectionInfo);if( $conn === false ) { die( print_r( sqlsrv_errors(), true));}$sql = "SELECT Sales FROM Table_1";$stmt = sqlsrv_prepare( $conn, $sql);if( $stmt === false ) { die( print_r( sqlsrv_errors(), true));}if( sqlsrv_execute( $stmt ) === false) { die( print_r( sqlsrv_errors(), true));}$salesTotal = 0;$count = 0;while( ($row = sqlsrv_fetch_array( $stmt)) && $salesTotal <=100000){ $qty = $row[0]; $price = $row[1]; $salesTotal += ( $price * $qty); $count++;}echo "$count sales accounted for the first $$salesTotal in revenue.<br />";// Cancel the pending results. The statement can be reused.sqlsrv_cancel( $stmt);?>
注释
The main difference between sqlsrv_cancel() and sqlsrv_free_stmt() is that a statement resource cancelled with sqlsrv_cancel() can be re-executed if it was created with sqlsrv_prepare(). A statement resource cancelled with sqlsrv_free_statement() cannot be re-executed.
参见
- sqlsrv_free_stmt() - Frees all resources for the specified statement
- sqlsrv_prepare() - Prepares a query for execution
