mysqli::multi_query

mysqli_multi_query

(PHP 5, PHP 7, PHP 8)

mysqli::multi_query -- mysqli_multi_query — Performs one or more queries on the database

Опис

Об'єктно-орієнтований стиль

public mysqli::multi_query(string $query): bool

Процедурний стиль

mysqli_multi_query(mysqli $mysql, string $query): bool

Executes one or multiple queries which are concatenated by a semicolon.

Увага

Попередження з безпеки: SQL-ін'єкція

Якщо рядок запиту має містити введені користувачем значення, то потрібно виконати підготовлений запит. Або ж дані мають бути правильно відформатовані, а всі рядки — екрановані функцією mysqli_real_escape_string().

Queries are sent asynchronously in a single call to the database, but the database processes them sequentially. mysqli_multi_query() waits for the first query to complete before returning control to PHP. The MySQL server will then process the next query in the sequence. Once the next result is ready, MySQL will wait for the next execution of mysqli_next_result() from PHP.

It is recommended to use do-while to process multiple queries. The connection will be busy until all queries have completed and their results are fetched to PHP. No other statement can be issued on the same connection until all queries are processed. To proceed to the next query in the sequence, use mysqli_next_result(). If the next result is not ready yet, mysqli will wait for the response from the MySQL server. To check if there are more results, use mysqli_more_results().

For queries which produce a result set, such as SELECT, SHOW, DESCRIBE or EXPLAIN, mysqli_use_result() or mysqli_store_result() can be used to retrieve the result set. For queries which do not produce a result set, the same functions can be used to retrieve information such as the number of affected rows.

Підказка

Executing CALL statements for stored procedures can produce multiple result sets. If the stored procedure contains SELECT statements, the result sets are returned in the order that they are produced as the procedure executes. In general, the caller cannot know how many result sets a procedure will return and must be prepared to retrieve multiple results. The final result from the procedure is a status result that includes no result set. The status indicates whether the procedure succeeded or an error occurred.

Параметри

mysql: Тільки процедурний стиль: об'єкт mysqli, якого повертає функція mysqli_connect() або mysqli_init()
query: A string containing the queries to be executed. Multiple queries must be separated by a semicolon.

Значення, що повертаються

Returns false if the first statement failed. To retrieve subsequent errors from other statements you have to call mysqli_next_result() first.

Помилки/виключення

Якщо увімкнені звіти про помилки mysqli (MYSQLI_REPORT_ERROR) і запитана операція не виконалась, буде виведено попередження, але якщо встановлено режим MYSQLI_REPORT_STRICT, буде викинуто виключення mysqli_sql_exception.

Приклади

Приклад #1 mysqli::multi_query() example

Об'єктно-орієнтований стиль

<?php

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

$query = "SELECT CURRENT_USER();";
$query .= "SELECT Name FROM City ORDER BY ID LIMIT 20, 5";

/* execute multi query */
$mysqli->multi_query($query);
do {
    /* store the result set in PHP */
    if ($result = $mysqli->store_result()) {
        while ($row = $result->fetch_row()) {
            printf("%s\n", $row[0]);
        }
    }
    /* print divider */
    if ($mysqli->more_results()) {
        printf("-----------------\n");
    }
} while ($mysqli->next_result());

Процедурний стиль

<?php

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

$query = "SELECT CURRENT_USER();";
$query .= "SELECT Name FROM City ORDER BY ID LIMIT 20, 5";

/* execute multi query */
mysqli_multi_query($link, $query);
do {
    /* store the result set in PHP */
    if ($result = mysqli_store_result($link)) {
        while ($row = mysqli_fetch_row($result)) {
            printf("%s\n", $row[0]);
        }
    }
    /* print divider */
    if (mysqli_more_results($link)) {
        printf("-----------------\n");
    }
} while (mysqli_next_result($link));

Подані вище приклади виведуть щось схоже на:

my_user@localhost
-----------------
Amersfoort
Maastricht
Dordrecht
Leiden
Haarlemmermeer

Прогляньте також

mysqli_query() - Performs a query on the database
mysqli_use_result() - Initiate a result set retrieval
mysqli_store_result() - Transfers a result set from the last query
mysqli_next_result() - Prepare next result from multi_query
mysqli_more_results() - Check if there are any more query results from a multi query