mysqli::select_db

mysqli_select_db

Selects the default database for database queries

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public `bool` `mysqli::select_db` `string` `database`

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`bool` `mysqli_select_db` `mysqli` `mysql` `string` `database`

Selects the default database to be used when performing queries against the database connection.

This function should only be used to change the default database for the connection. You can select the default database with 4th parameter in `mysqli_connect`.

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`database`

- The database name.

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### `mysqli::select_db` example

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    <?php

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

    /* get the name of the current default database */
    $result = $mysqli->query("SELECT DATABASE()");
    $row = $result->fetch_row();
    printf("Default database is %s.\n", $row[0]);

    /* change default database to "world" */
    $mysqli->select_db("world");

    /* get the name of the current default database */
    $result = $mysqli->query("SELECT DATABASE()");
    $row = $result->fetch_row();
    printf("Default database is %s.\n", $row[0]);

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    <?php

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

    /* get the name of the current default database */
    $result = mysqli_query($link, "SELECT DATABASE()");
    $row = mysqli_fetch_row($result);
    printf("Default database is %s.\n", $row[0]);

    /* change default database to "world" */
    mysqli_select_db($link, "world");

    /* get the name of the current default database */
    $result = mysqli_query($link, "SELECT DATABASE()");
    $row = mysqli_fetch_row($result);
    printf("Default database is %s.\n", $row[0]);

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    Default database is test.
    Default database is world.

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- `mysqli_connect`
- `mysqli_real_connect`