搜索某属性：
select exp from player where level = 2;
创建表：
create table player (level integer primary key, name text);
删除表：
drop table player;
更新数据：
update player set exp = 300 where level = 2;
插入数据：
insert into player (level, exp) values ('2', '200');
insert into player values ('2', '200');
复制表：
create table newtable as select * from oldtable where rowid = 1
获得所有table名：
select name from sqlite_master where type='table' order by name;