mysqli::stmt_init

mysqli_stmt_init

(PHP 5, PHP 7, PHP 8)

mysqli::stmt_init -- mysqli_stmt_init — 初始化一条语句并返回一个用于mysqli_stmt_prepare(调用)的对象

说明

面向对象风格

mysqli::stmt_init(): mysqli_stmt

过程化风格

mysqli_stmt_init(mysqli $link): mysqli_stmt

分配并初始化一个语句对象用于mysqli_stmt_prepare().

注意:
任何其后调用的mysqli_stmt函数都会失败直到mysqli_stmt_prepare()被调用.

参数

mysql: 仅以过程化样式：由mysqli_connect() 或 mysqli_init() 返回的 mysqli 对象。

返回值

Returns an object.

参见

mysqli_stmt_prepare() - Prepares an SQL statement for execution

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User Contributed Notes 3 notes

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Jeff C ¶

5 years ago


stmt_init() seems to clear previous (possibly erroneous) results on the DB connection, which means you don't necessarily need to use it but it could make the code more robust.

In a PHPUnit test, I had a sequence of prepared queries on the same connection. One of them fetched a row from a SELECT but didn't keep fetching until it drained the connection, so it left some stale results. When the next query did this:

<?php
$db = $this->getConnection()->getDbConnection();
$preparedQuery = $db->prepare ($query);
?>

the prepare() call generated an error: "Could not prepare query: Commands out of sync; you can't run this command now." Changing to this:

<?php
$db = $this->getConnection()->getDbConnection();
$preparedQuery = $db->stmt_init();
$preparedQuery->prepare ($query);
?>

resolved the problem.

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mamdo7 at hotmail dot com ¶

8 years ago


you can use $stmt = $mysqli->prepare(); directly without stmt-init() . i think there is no need for stmt-init .

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-26

Deepak Sati ¶

7 years ago


If your sql query has some errors and you don't use stmt_init() before preparing the statement, you won't get error message for wrong sql query.

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