mysqli_stmt::$num_rows

    mysqli_stmt::num_rows

    mysqli_stmt_num_rows

    (PHP 5, PHP 7, PHP 8)

    mysqli_stmt::$num_rows -- mysqli_stmt::num_rows -- mysqli_stmt_num_rows — Returns the number of rows fetched from the server

    说明

    面向对象风格

    int|string $mysqli_stmt->num_rows;
    public mysqli_stmt::num_rows(): int|string

    过程化风格

    mysqli_stmt_num_rows(mysqli_stmt $statement): int|string

    Returns the number of rows buffered in the statement. This function will only work after mysqli_stmt_store_result() is called to buffer the entire result set in the statement handle.

    This function returns 0 unless all rows have been fetched from the server.

    参数

    statement

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

    返回值

    An int representing the number of buffered rows. Returns 0 in unbuffered mode unless all rows have been fetched from the server.

    注意:

    If the number of rows is greater than PHP_INT_MAX, the number will be returned as a string.

    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 LIMIT 20";
    $stmt = $mysqli->prepare($query);
    $stmt->execute();

    /* store the result in an internal buffer */
    $stmt->store_result();

    printf("Number of rows: %d.\n", $stmt->num_rows);

    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 LIMIT 20";
    $stmt = mysqli_prepare($link, $query);
    mysqli_stmt_execute($stmt);

    /* store the result in an internal buffer */
    mysqli_stmt_store_result($stmt);

    printf("Number of rows: %d.\n", mysqli_stmt_num_rows($stmt));

    以上示例会输出：

    Number of rows: 20.

    参见

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    用户贡献的备注 1 note

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    Typer85 at gmail dot com
    17 years ago
    Please be advised, for people who sometimes miss to read this important Manual entry for this function:

    If you do not use mysqli_stmt_store_result( ), and immediatley call this function after executing a prepared statement, this function will usually return 0 as it has no way to know how many rows are in the result set as the result set is not saved in memory yet.

    mysqli_stmt_store_result( ) saves the result set in memory thus you can immedietly use this function after you both execute the statement AND save the result set.

    If you do not save the result set but still want to use this function you have to actually loop through the result set one row at a time using mysqli_stmt_fetch( ) before using this function to determine the number of rows.

    A thought though, if you want to determine the number of rows without storing the result set and after looping through it, why not just simply keep an internal counter in your loop every time a row is fetched and save the function call.

    In short, this function is only really useful if you save the result set and want to determine the number of rows before looping through it, otherwise you can pretty much recreate its use like I suggested.
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