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Description

Selects a database using the current database connection.

The database name will be changed based on the current database connection. On failure, the execution will bail and display an DB error.

Usage

wpdb::select( $db, $dbh );

Parameters

$db

( string ) required – MySQL database name

$dbh

( resource|null ) optional – Optional link identifier.

Returns

void

Source

File name: wordpress/wp-includes/wp-db.php
Lines:

  public function select( $db, $dbh = null ) {
    if ( is_null( $dbh ) ) {
      $dbh = $this->dbh;
    }

    if ( $this->use_mysqli ) {
      $success = mysqli_select_db( $dbh, $db );
    } else {
      $success = mysql_select_db( $db, $dbh );
    }
    if ( ! $success ) {
      $this->ready = false;
      if ( ! did_action( 'template_redirect' ) ) {
        wp_load_translations_early();

        $message = '<h1>' . __( 'Can&#8217;t select database' ) . "</h1>\n";

        $message .= '<p>' . sprintf(
          /* translators: %s: Database name. */
          __( 'We were able to connect to the database server (which means your username and password is okay) but not able to select the %s database.' ),
          '<code>' . htmlspecialchars( $db, ENT_QUOTES ) . '</code>'
        ) . "</p>\n";

        $message .= "<ul>\n";
        $message .= '<li>' . __( 'Are you sure it exists?' ) . "</li>\n";

        $message .= '<li>' . sprintf(
          /* translators: 1: Database user, 2: Database name. */
          __( 'Does the user %1$s have permission to use the %2$s database?' ),
          '<code>' . htmlspecialchars( $this->dbuser, ENT_QUOTES ) . '</code>',
          '<code>' . htmlspecialchars( $db, ENT_QUOTES ) . '</code>'
        ) . "</li>\n";

        $message .= '<li>' . sprintf(
          /* translators: %s: Database name. */
          __( 'On some systems the name of your database is prefixed with your username, so it would be like <code>username_%1$s</code>. Could that be the problem?' ),
          htmlspecialchars( $db, ENT_QUOTES )
        ) . "</li>\n";

        $message .= "</ul>\n";

        $message .= '<p>' . sprintf(
          /* translators: %s: Support forums URL. */
          __( 'If you don&#8217;t know how to set up a database you should <strong>contact your host</strong>. If all else fails you may find help at the <a href="%s">WordPress Support Forums</a>.' ),
          __( 'https://wordpress.org/support/forums/' )
        ) . "</p>\n";

        $this->wpdb::bail( $message, 'db_select_fail' );
      }
    }
  }
 

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