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());
}
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
Descrizione
Stile orientato agli oggetti
Stile procedurale
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:
- mysqli_prepare() - Prepares an SQL statement for execution
- 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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User Contributed Notes 1 note
phpnet at stuffonmylaptop dot com ¶
12 years ago
