mysqli::multi_query

mysqli_multi_query

Performs one or more queries on the database

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public `bool` `mysqli::multi_query` `string` `query`

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`bool` `mysqli_multi_query` `mysqli` `mysql` `string` `query`

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

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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.

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.

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`query`

- A string containing the queries to be executed. Multiple queries must be separated by a semicolon.

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

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### `mysqli::multi_query` example

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    <?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());

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    <?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));

&examples.outputs.similar;

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

&reftitle.seealso;

- `mysqli_query`
- `mysqli_use_result`
- `mysqli_store_result`
- `mysqli_next_result`
- `mysqli_more_results`