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    mysqli_stmt::data_seek

    mysqli_stmt_data_seek

    (PHP 5, PHP 7, PHP 8)

    mysqli_stmt::data_seek -- mysqli_stmt_data_seek — Adjusts the result pointer to an arbitrary row in the buffered result

    说明

    面向对象风格

    public mysqli_stmt::data_seek(int $offset): void

    过程化风格

    mysqli_stmt_data_seek(mysqli_stmt $statement, int $offset): void

    This function moves the result set pointer of the buffered result set to an arbitrary row specified by the offset parameter.

    This function works only on the buffered internal result set. mysqli_stmt_store_result() must be called prior to mysqli_stmt_data_seek().

    参数

    statement

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

    offset

    Must be between zero and the total number of rows minus one (0.. mysqli_stmt_num_rows() - 1).

    返回值

    没有返回值。

    示例

    示例 #1 面向对象风格

    <?php

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

    $query = "SELECT Name, CountryCode FROM City ORDER BY Name";
    $stmt = $mysqli->prepare($query);
    $stmt->execute();

    $stmt->bind_result($name, $code);

    $stmt->store_result();

    /* seek to row no. 400 */
    $stmt->data_seek(399);

    $stmt->fetch();

    printf("City: %s Countrycode: %s\n", $name, $code);

    示例 #2 过程化风格

    <?php

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

    $query = "SELECT Name, CountryCode FROM City ORDER BY Name";
    $stmt = mysqli_prepare($link, $query);

    mysqli_stmt_execute($stmt);

    mysqli_stmt_bind_result($stmt, $name, $code);

    mysqli_stmt_store_result($stmt);

    /* seek to row no. 400 */
    mysqli_stmt_data_seek($stmt, 399);

    mysqli_stmt_fetch($stmt);

    printf("City: %s Countrycode: %s\n", $name, $code);

    以上示例会输出：

    City: Benin City  Countrycode: NGA

    参见

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    User Contributed Notes 1 note

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    1
    phpnet at stuffonmylaptop dot com
    12 years ago
    Although the documentation says you must provide a number between 0 and count - 1, you can actually supply a negative number, which appears to be cast to positive (such as in abs()).

    For example:

    <?php
    $db     = new mysqli('localhost', 'test', 'password', 'schema');
    $db->multi_query("
                SELECT * FROM
                (
                    SELECT 1 as 'position'
                    UNION SELECT 2 as 'position'
                    UNION SELECT 3 as 'position'
                    UNION SELECT 4 as 'position'
                    UNION SELECT 5 as 'position'
                ) as rows"    );
               
    $result = $db->store_result();

    for (    $i = 0; $i < $result->num_rows; $i++)
    {
            $offset = $i;
            $result->data_seek($offset);
            var_dump("Seek offset is: {$offset}", $result->fetch_object());
    }

    for (    $i = 0; $i < $result->num_rows; $i++)
    {
            $offset = -$i;
            $result->data_seek($offset);
            var_dump("Seek offset is: {$offset}", $result->fetch_object());
    }
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