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

mysqli_prepare() - 预处理执行 SQL
mysqli_stmt_store_result() - Stores a result set in an internal buffer
mysqli_stmt_num_rows() - Returns the number of rows fetched from the server
mysqli_data_seek() - Adjusts the result pointer to an arbitrary row in the result

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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());
}