text: insert into user(id,username,name,age,balance)values(1,'user1','张三',20,100.0);
  insert into user(id,username,name,age,balance)values(2,'user2','李四',20,100.0);
  insert into user(id,username,name,age,balance)values(3,'user3','王五',20,100.0);
  insert into user(id,username,name,age,balance)values(4,'user4','马六',20,100.0);