mysqli_stmt::data_seek

mysqli_stmt_data_seek

(PHP 5, PHP 7, PHP 8)

mysqli_stmt::data_seek -- mysqli_stmt_data_seekAdjusts the result pointer to an arbitrary row in the buffered result

Descrizione

Stile orientato agli oggetti

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

Stile procedurale

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().

Elenco dei parametri

stmt

Solo nello stile procedurale: un identificatore di statement restituito da mysqli_stmt_init().

offset

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

Valori restituiti

Nessun valore viene restituito.

Esempi

Example #1 Stile orientato agli oggetti

<?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);

Example #2 Stile procedurale

<?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);

I precedenti esempi visualizzeranno:

City: Benin City  Countrycode: NGA

Vedere anche:

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User Contributed Notes 1 note

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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());
}
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