# sqlsrv_prepare

(No version information available, might only be in Git)

sqlsrv_prepare — Prepares a query for execution

### 说明

sqlsrv_prepare ( resource `$conn` , string `$sql` [, array `$params` [, array `$options` ]] ) : mixed

Prepares a query for execution. This function is ideal for preparing a query that will be executed multiple times with different parameter values.

### 参数

`conn`

  A connection resource returned by sqlsrv_connect().

`sql`

  The string that defines the query to be prepared and executed.

`params`

  An array specifying parameter information when executing a parameterized query. Array elements can be any of the following:

  - A literal value
  - A PHP variable
  - An array with this structure: array($value [, $direction [, $phpType [, $sqlType]]])
  The following table describes the elements in the array structure above:

  Array structure
  Element | Description
  --- | ---
  $value | A literal value, a PHP variable, or a PHP by-reference variable.
  $direction (optional) | One of the following SQLSRV constants used to indicate the parameter direction: SQLSRV_PARAM_IN, SQLSRV_PARAM_OUT, SQLSRV_PARAM_INOUT. The default value is SQLSRV_PARAM_IN.
  $phpType (optional) | A SQLSRV_PHPTYPE_* constant that specifies PHP data type of the returned value.
  $sqlType (optional) | A SQLSRV_SQLTYPE_* constant that specifies the SQL Server data type of the input value.

`options`

  An array specifing query property options. The supported keys are described in the following table:

  Query Options
  Key | Values | Description
  --- | --- | ---
  QueryTimeout | A positive integer value. | Sets the query timeout in seconds. By default, the driver will wait indefinitely for results.
  SendStreamParamsAtExec | `TRUE` or `FALSE` (the default is `TRUE`) | Configures the driver to send all stream data at execution (`TRUE`), or to send stream data in chunks (`FALSE`). By default, the value is set to `TRUE`. For more information, see sqlsrv_send_stream_data().
  Scrollable | SQLSRV_CURSOR_FORWARD, SQLSRV_CURSOR_STATIC, SQLSRV_CURSOR_DYNAMIC, or SQLSRV_CURSOR_KEYSET | See » Specifying a Cursor Type and Selecting Rows in the Microsoft SQLSRV documentation.

### 返回值

Returns a statement resource on success and `FALSE` if an error occurred.

### 范例

Example #1 sqlsrv_prepare() example

This example demonstrates how to prepare a statement with sqlsrv_prepare() and re-execute it multiple times (with different parameter values) using sqlsrv_execute().

    <?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 = "UPDATE Table_1
            SET OrderQty = ?
            WHERE SalesOrderID = ?";

    // Initialize parameters and prepare the statement.
    // Variables $qty and $id are bound to the statement, $stmt.
    $qty = 0; $id = 0;
    $stmt = sqlsrv_prepare( $conn, $sql, array( &$qty, &$id));
    if( !$stmt ) {
        die( print_r( sqlsrv_errors(), true));
    }

    // Set up the SalesOrderDetailID and OrderQty information.
    // This array maps the order ID to order quantity in key=>value pairs.
    $orders = array( 1=>10, 2=>20, 3=>30);

    // Execute the statement for each order.
    foreach( $orders as $id => $qty) {
        // Because $id and $qty are bound to $stmt1, their updated
        // values are used with each execution of the statement.
        if( sqlsrv_execute( $stmt ) === false ) {
              die( print_r( sqlsrv_errors(), true));
        }
    }
    ?>

### 注释

When you prepare a statement that uses variables as parameters, the variables are bound to the statement. This means that if you update the values of the variables, the next time you execute the statement it will run with updated parameter values. For statements that you plan to execute only once, use sqlsrv_query().

### 参见

- sqlsrv_execute() - Executes a statement prepared with sqlsrv_prepare
- sqlsrv_query() - Prepares and executes a query