select * from user where account = #{account}; select * from user where email = #{email}; insert into user(account, password, username, email, pic) values (#{account}, #{password}, #{username}, #{email}, #{pic}); delete from user where account = #{account}; update user set password=#{password} and username = #{username} and email = #{email} where account = #{account}; update user set pic=#{pic} where account = #{account}