SQL语言的分类

SQL语言共分为四大类:数据查询语言DQL,数据操纵语言DML,数据定义语言DDL,数据控制语言DCL。

1. 数据查询语言DQL
数据查询语言DQL基本结构是由SELECT子句,FROM子句,WHERE
子句组成的查询块:
SELECT <字段名表>
FROM <表或视图名>
WHERE <查询条件>

executeQuery(sql);

2 .数据操纵语言DML
数据操纵语言DML主要有三种形式:
1) 插入:INSERT
2) 更新:UPDATE
3) 删除:DELETE

executeUpdate(sql);

3. 数据定义语言DDL
数据定义语言DDL用来创建数据库中的各种对象-----表、视图、
索引、同义词、聚簇等如:
CREATE TABLE/VIEW/INDEX/SYN/CLUSTER
| | | | |
表 视图 索引 同义词 簇

DDL操作是隐性提交的!不能rollback

execute(sql);

4. 数据控制语言DCL
数据控制语言DCL用来授予或回收访问数据库的某种特权,并控制
数据库操纵事务发生的时间及效果,对数据库实行监视等。如:
1) GRANT:授权。

2) ROLLBACK [WORK] TO [SAVEPOINT]:回退到某一点。
回滚---ROLLBACK
回滚命令使数据库状态回到上次最后提交的状态。其格式为:
SQL>ROLLBACK;

3) COMMIT [WORK]:提交。

在数据库的插入、删除和修改操作时,只有当事务在提交到数据
库时才算完成。在事务提交前,只有操作数据库的这个人才能有权看
到所做的事情,别人只有在最后提交完成后才可以看到。
提交数据有三种类型:显式提交、隐式提交及自动提交。下面分
别说明这三种类型。

(1) 显式提交
用COMMIT命令直接完成的提交为显式提交。其格式为:
SQL>COMMIT;

(2) 隐式提交
用SQL命令间接完成的提交为隐式提交。这些命令是:
ALTER,AUDIT,COMMENT,CONNECT,CREATE,DISCONNECT,DROP,
EXIT,GRANT,NOAUDIT,QUIT,REVOKE,RENAME。

(3) 自动提交
若把AUTOCOMMIT设置为ON,则在插入、修改、删除语句执行后,
系统将自动进行提交,这就是自动提交。其格式为:
SQL>SET AUTOCOMMIT ON;

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