Erro usando adodb com php7

<?


require('adodb5/adodb.inc.php');


    class conexao
    {

         var $tipo_banco = "mysql";
         var $servidor = "localhost";
         var $usuario = "root";
         var $senha = "252525";
         var $banco ;

        function conexao()
        {

            $this->banco = NewADOConnection($this->tipo_banco);
            $this->banco->dialect = 3;
            $this->banco->debug = true;
            $this->banco->Connect($this->servidor,$this->usuario,$this->senha);


        }


    }

    $con = new conexao();

    mysql_select_db("carrinho_campras");

    if($con)
        echo "conectou";
    else
        echo "nao conectou";

?>

Esta dano esse erro.

PHP Fatal error:  Uncaught Error: Call to undefined function mysql_connect() in C:\inetpub\wwwroot\Dream\util\adodb5\drivers\adodb-mysql.inc.php:461
Stack trace:
#0 C:\inetpub\wwwroot\Dream\util\adodb5\adodb.inc.php(670): ADODB_mysql->_connect('localhost', 'root', '252525', '')
#1 C:\inetpub\wwwroot\Dream\util\Conexao.php(22): ADOConnection->Connect('localhost', 'root', '252525')
#2 C:\inetpub\wwwroot\Dream\util\Conexao.php(30): conexao->conexao()
#3 {main}
  thrown in C:\inetpub\wwwroot\Dream\util\adodb5\drivers\adodb-mysql.inc.php on line 461