Php/docs/mysqli-stmt.store-result

• PHP Manual
• MySQLi_STMT
• Transfers a result set from a prepared statement

mysqli_stmt::store_result

mysqli_stmt_store_result

(PHP 5, PHP 7)

mysqli_stmt::store_result -- mysqli_stmt_store_result — Transfers a result set from a prepared statement

说明

面向对象风格

public mysqli_stmt::store_result ( ) : bool

过程化风格

mysqli_stmt_store_result ( mysqli_stmt $stmt ) : bool

You must call mysqli_stmt_store_result() for every query that successfully produces a result set (SELECT, SHOW, DESCRIBE, EXPLAIN), if and only if you want to buffer the complete result set by the client, so that the subsequent mysqli_stmt_fetch() call returns buffered data.

Note:

It is unnecessary to call mysqli_stmt_store_result() for other queries, but if you do, it will not harm or cause any notable performance loss in all cases. You can detect whether the query produced a result set by checking if mysqli_stmt_result_metadata() returns false.

参数

stmt

仅以过程化样式：由 mysqli_stmt_init() 返回的 statement 标识。

返回值

成功时返回 true， 或者在失败时返回 false。

范例

Example #1 面向对象风格

<?php/* Open a connection */$mysqli = new mysqli("localhost", "my_user", "my_password", "world");/* check connection */if (mysqli_connect_errno()) {    printf("Connect failed: %s\n", mysqli_connect_error());    exit();}$query = "SELECT Name, CountryCode FROM City ORDER BY Name LIMIT 20";if ($stmt = $mysqli->prepare($query)) {    /* execute query */    $stmt->execute();    /* store result */    $stmt->store_result();    printf("Number of rows: %d.\n", $stmt->num_rows);    /* free result */    $stmt->free_result();    /* close statement */    $stmt->close();}/* close connection */$mysqli->close();?>

Example #2 过程化风格

<?php/* Open a connection */$link = mysqli_connect("localhost", "my_user", "my_password", "world");/* check connection */if (mysqli_connect_errno()) {    printf("Connect failed: %s\n", mysqli_connect_error());    exit();}$query = "SELECT Name, CountryCode FROM City ORDER BY Name LIMIT 20";if ($stmt = mysqli_prepare($link, $query)) {    /* execute query */    mysqli_stmt_execute($stmt);    /* store result */    mysqli_stmt_store_result($stmt);    printf("Number of rows: %d.\n", mysqli_stmt_num_rows($stmt));    /* free result */    mysqli_stmt_free_result($stmt);    /* close statement */    mysqli_stmt_close($stmt);}/* close connection */mysqli_close($link);?>

以上例程会输出：

Number of rows: 20.

参见

• mysqli_prepare() - 准备执行一个 SQL 语句
• mysqli_stmt_result_metadata() - Returns result set metadata from a prepared statement
• mysqli_stmt_fetch() - Fetch results from a prepared statement into the bound variables