Oracle存储过程详解(一)

    create [or replace] procedure 存储过程名（param1 in type，param2 out type） as 变量1 类型（值范围）;
变量2 类型（值范围）;
Begin Select count(*) into 变量1 from 表A where列名=param1； If (判断条件) then Select 列名 into 变量2 from 表A where列名=param1； Dbms_output。Put_line(‘打印信息’);
    Elsif (判断条件) then
       Dbms_output。Put_line(‘打印信息’);
    Else
       Raise 异常名（NO_DATA_FOUND）;
    End if;

Exception
    When others then
       Rollback;
End;

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
    --执行体
END 存储过程名字;

  BEGIN SELECT col1,col2 into 变量1,变量2 FROM typestruct where xxx;
  EXCEPTION
  WHEN NO_DATA_FOUND THEN
      xxxx;
  END;

 IF V_TEST=1 THEN
    BEGIN do something END;
  END IF;

  WHILE V_TEST=1 LOOP
  BEGIN
    XXXX
  END;
  END LOOP;

 V_TEST := 123;

  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;

  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;

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

 --正确
select keynode into kn from APPFOUNDATION where appid=aid and foundationid=fid;

--错误
select af.keynode into kn from APPFOUNDATION af where af.appid=appid and af.foundationid=foundationid;
-- 运行阶段报错，提示ORA-01422:exact fetch returns more than requested number of rows

create table A( id varchar2(50) primary key not null, vcount number(8) not null, bid varchar2(50) not null -- 外键 );

select sum(vcount) into fcount from A where bid='xxxxxx';

if fcount is null then
    fcount:=0;
end if;

    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();
                        return null;
                    }
                });