text: CREATE TABLE IF NOT EXISTS  t_cache (
  	id BIGINT(20) NOT NULL,
  	name VARCHAR(30) NULL DEFAULT NULL ,
  	PRIMARY KEY (id)
  );
  insert into t_cache values (1,'a');
  insert into t_cache values (2,'b');
  insert into t_cache values (3,'c');
  insert into t_cache values (4,'d');
  insert into t_cache values (5,'e');
  