mysqli_stmt::prepare

    mysqli_stmt_prepare

    (PHP 5, PHP 7, PHP 8)

    mysqli_stmt::prepare -- mysqli_stmt_prepare — Prepares an SQL statement for execution

    说明

    面向对象风格

    public mysqli_stmt::prepare(string $query): bool

    过程化风格

    mysqli_stmt_prepare(mysqli_stmt $statement, string $query): bool

    Prepares a statement for execution. The query must consist of a single SQL statement.

    The statement template can contain zero or more question mark (?) parameter markers⁠—also called placeholders. The parameter markers must be bound to application variables using mysqli_stmt_bind_param() before executing the statement.

    注意:

    In the case where a statement is passed to mysqli_stmt_prepare() that is longer than max_allowed_packet of the server, the returned error codes are different depending on whether you are using MySQL Native Driver (mysqlnd) or MySQL Client Library (libmysqlclient). The behavior is as follows:

    • mysqlnd on Linux returns an error code of 1153. The error message means got a packet bigger than max_allowed_packet bytes.

    • mysqlnd on Windows returns an error code 2006. This error message means server has gone away.

    • libmysqlclient on all platforms returns an error code 2006. This error message means server has gone away.

    参数

    statement

    仅以过程化样式：由 mysqli_stmt_init() 返回的 mysqli_stmt 对象。

    query

    The query, as a string. It must consist of a single SQL statement.

    The SQL statement may contain zero or more parameter markers represented by question mark (?) characters at the appropriate positions.

    注意:

    The markers are legal only in certain places in SQL statements. For example, they are permitted in the VALUES() list of an INSERT statement (to specify column values for a row), or in a comparison with a column in a WHERE clause to specify a comparison value. However, they are not permitted for identifiers (such as table or column names).

    返回值

    成功时返回 true， 或者在失败时返回 false。

    错误／异常

    If mysqli error reporting is enabled (MYSQLI_REPORT_ERROR) and the requested operation fails, a warning is generated. If, in addition, the mode is set to MYSQLI_REPORT_STRICT, a mysqli_sql_exception is thrown instead.

    示例

    示例 #1 mysqli_stmt::prepare() example

    面向对象风格

    <?php

    mysqli_report    (MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
    $mysqli = new mysqli("localhost", "my_user", "my_password", "world");

    $city = "Amersfoort";

    /* create a prepared statement */
    $stmt = $mysqli->stmt_init();
    $stmt->prepare("SELECT District FROM City WHERE Name=?");

    /* bind parameters for markers */
    $stmt->bind_param("s", $city);

    /* execute query */
    $stmt->execute();

    /* bind result variables */
    $stmt->bind_result($district);

    /* fetch value */
    $stmt->fetch();

    printf("%s is in district %s\n", $city, $district);

    过程化风格

    <?php

    mysqli_report    (MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
    $link = mysqli_connect("localhost", "my_user", "my_password", "world");

    $city = "Amersfoort";

    /* create a prepared statement */
    $stmt = mysqli_stmt_init($link);
    mysqli_stmt_prepare($stmt, "SELECT District FROM City WHERE Name=?");

    /* bind parameters for markers */
    mysqli_stmt_bind_param($stmt, "s", $city);

    /* execute query */
    mysqli_stmt_execute($stmt);

    /* bind result variables */
    mysqli_stmt_bind_result($stmt, $district);

    /* fetch value */
    mysqli_stmt_fetch($stmt);

    printf("%s is in district %s\n", $city, $district);

    以上示例会输出：

    Amersfoort is in district Utrecht

    参见

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