ORACLE的存储过程语法集锦(转)
1.基本结构
CREATE OR REPLACE PROCEDURE 存储过程名字
(
??? 参数1 IN NUMBER,
??? 参数2 IN NUMBER
) IS
变量1 INTEGER :=0;
变量2 DATE;
BEGIN
END 存储过程名字
2.SELECT INTO STATEMENT
将select查询的结果存入到变量中,可以同时将多个列存储多个变量中,必须有一条
记录,否则抛出异常(如果没有记录抛出NO_DATA_FOUND)
例子:
BEGIN
SELECT col1,col2 into 变量1,变量2 FROM typestruct where xxx;
EXCEPTION
WHEN NO_DATA_FOUND THEN
???? xxxx;
END;
...
3.IF 判断
IF V_TEST=1 THEN
??? BEGIN
?????? do something
??? END;
END IF;
4.while 循环
WHILE V_TEST=1 LOOP
BEGIN
XXXX
END;
END LOOP;
5.变量赋值
V_TEST := 123;
6.用for in 使用cursor
...
IS
CURSOR cur IS SELECT * FROM xxx;
BEGIN
FOR cur_result in cur LOOP
?? BEGIN
??? V_SUM :=cur_result.列名1+cur_result.列名2
?? END;
END LOOP;
END;
7.带参数的cursor
CURSOR C_USER(C_ID NUMBER) IS SELECT NAME FROM USER WHERE TYPEID=C_ID;
OPEN C_USER(变量值);
LOOP
FETCH C_USER INTO V_NAME;
EXIT FETCH C_USER%NOTFOUND;
??? do something
END LOOP;
CLOSE C_USER;
8.用pl/sql developer debug
连接数据库后建立一个Test WINDOW
在窗口输入调用SP的代码,F9开始debug,CTRL+N单步调试
?
关于oracle存储过程的若干问题备忘1.在oracle中,数据表别名不能加as,如:
select a.appname from appinfo a;-- 正确
select a.appname from appinfo as a;--错误
??select af.keynode into kn from APPFOUNDATION af where af.appid=aid and af.foundationid=fid;-- 有into,正确编译
??select af.keynode from APPFOUNDATION af where af.appid=aid and af.foundationid=fid;-- 没有into,编译报错,提示:Compilation
?? Error: PLS-00428: an INTO clause is expected in this SELECT statement
3.在利用select...into...语法时,必须先确保数据库中有该条记录,否则会报出"no data found"异常。
select keynode into kn from APPFOUNDATION where appid=aid and foundationid=fid;-- 正确运行
select af.keynode into kn from APPFOUNDATION af whereaf.appid=appidandaf.foundationid=foundationid;-- 运行阶段报错,提示
ORA-01422:exact fetchreturns more than requested numberof rows
5.在存储过程中,关于出现null的问题
createtable A(
id varchar2(50) primarykeynotnull,
vcount number(8) notnull,
bid varchar2(50) notnull-- 外键
); 如果在存储过程中,使用如下语句:
select sum(vcount) into fcount from A where bid='xxxxxx'; 如果A表中不存在bid="xxxxxx"的记录,则fcount=null(即使fcount定义时设置了默认值,如:fcount number(8):=0依然无效,fcount还是会变成null),这样以后使用fcount时就可能有问题,所以在这里最好先判断一下:
if fcount isnull then
???? fcount:=0;
end if; 这样就一切ok了。6.Hibernate调用oracle存储过程
????????this.pnumberManager.getHibernateTemplate().execute(
????????????????new HibernateCallback() ...{
????????????????????public Object doInHibernate(Session session)
????????????????????????????throws HibernateException, SQLException ...{
???????????????????????? CallableStatement cs = session
???????????????????????????????? .connection()
???????????????????????????????? .prepareCall("{call modifyapppnumber_remain(?)}");
???????????????????????? cs.setString(1, foundationid);
???????????????????????? cs.execute();
????????????????????????returnnull;
???????????????????? }
???????????????? });