Mysql的增删改查语句简单实现

insert into tablename(...) values(...)
//如果增加的记录包括所有的列，则不需要写数据列表
insert into tablename values(...)

delete from tablename where condition ;

update tablename set xx=xx , xx=xx... where condition ;
alter table tablename set xx=xx , xx=xx... where condition ;

select (...) from tablename where condition ;
select * from tablename where condition ;

drop table tablename ;

alter table tablename add column columnname columntype ... ;

alter table tablename drop column columnname ;