mysqli::select_db

    mysqli_select_db

    (PHP 5, PHP 7, PHP 8)

    mysqli::select_db -- mysqli_select_db — Selects the default database for database queries

    Description

    Object-oriented style

    public mysqli::select_db(string $database): bool

    Procedural style

    mysqli_select_db(mysqli $mysql, string $database): bool

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

    Note:

    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().

    Parameters

    mysql

    Procedural style only: A mysqli object returned by mysqli_connect() or mysqli_init()

    database

    The database name.

    Return Values

    Returns true on success or false on failure.

    Errors/Exceptions

    If mysqli error reporting is enabled (MYSQLI_REPORT_ERROR) and the requested operation fails, a warning is generated. If, in addition, the mode is set to MYSQLI_REPORT_STRICT, a mysqli_sql_exception is thrown instead.

    Examples

    Example #1 mysqli::select_db() example

    Object-oriented style

    <?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]);

    Procedural style

    <?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]);

    The above examples will output:

    Default database is test.
Default database is world.

    See Also

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    User Contributed Notes 4 notes

    up
    0
    pepgeorge at gmail dot com
    3 days ago
    // If you want to INSERT

    public function insert ($objet)
    {
    try {

    $id = $objet->id;
    $name = $objet->name;


    $sql = 'INSERT INTO table_name (id, name) VALUES (:id, :name)';
    $stm = $this->conexion->prepare($sql);
    $stm->bindParam(':id', $id, PDO::PARAM_INT);
    $stm->bindParam(':name', $name, PDO::PARAM_STR);

    $stm->execute();
    } catch (PDOException $e) {
    return "ERROR: " . $e->getMessage();
    }
    }
    up
    0
    Anonymous
    3 days ago
    // If you want to do an update:

    public function update($object)
    {
    try {

    $id = $object->id;
    $name = $object->name;

    $sql = 'UPDATE table_name SET id = :id, name = :name WHERE id = :id';
    $stm = $this->conexion->prepare($sql);
    $stm->bindParam(':id', $id, PDO::PARAM_INT);
    $stm->bindParam(':name', $name, PDO::PARAM_STR);

    $stm->execute();
    } catch (PDOException $e) {
    return 'ERROR: ' . $e->getMessage();
    }
    }
    up
    0
    pepgeorge at gmail dot com
    3 days ago
    //If you want to select something:

    public function selectFrom($idOfObject)
    {
    $sql = 'SELECT DISTINCT *
    FROM tableName
    WHERE ________
    AND ______';

    $stmt = $this->conexion->prepare($sql);
    $stmt->bindValue(':_______', $idOfObject, PDO::PARAM_INT);
    $stmt->execute();

    $result = $stmt->fetchAll(PDO::FETCH_ASSOC);

    return $result;
    }
    up
    0
    lori at astoundingteam dot com
    1 year ago
    Note that the order of arguments for `mysqli_select_db` is opposite what it is for the deprecated `mysql_select_db`.
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