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oracle之存储过程,临时表,游标示例

Jun 07, 2016 pm 03:26 PM
dd oracle storage Summarize cursor Example process

总结如下: DDL是一种消耗资源非常大的操作,运行时尽量不要使用DDL语句,应用程序需要的临时表应在运行之前就开始创建。不必在每个存储过程中创建一次。临时表总是存在的,他们作为对象存在于数据字典中,并且总是保持为空,直到有会话在其中放入数据 1 创

总结如下:
DDL是一种消耗资源非常大的操作,运行时尽量不要使用DDL语句,应用程序需要的临时表应在运行之前就开始创建。不必在每个存储过程中创建一次。临时表总是存在的,他们作为对象存在于数据字典中,并且总是保持为空,直到有会话在其中放入数据
1 创建临时表
Sql代码 
create global temporary table 表名 

  ID               VARCHAR2(100 CHAR), 
  NAME         VARCHAR2(100 CHAR)  

on commit preserve rows; 

2 创建存储过程

Sql代码 
create or replace procedure proc_XXX( 
mycur out SYS_REFCURSOR 
as 
TYPE My_CurType IS REF CURSOR; 
CUR_1 My_CurType; 
tempa varchar2; 
tempb varchar2; 
--此处可声明更多变更^_^ 
begin 
  
    OPEN CUR_1 FOR  select * from 表名; 
   
    --使用前先清空 
    execute immediate 'truncate table  临时表表名'; 
 
  LOOP 
  FETCH CUR_1 INTO  tempa; 
  EXIT WHEN CUR_1%NOTFOUND; 
     
      --进行相关的业务查询,将结果返回于更多变量上,插入临时表数据       
     tempa:='1'; 
     tempb:='jack'; 
     insert into 临时表表名(ID,NAME)values(tempa,tempb);  
     commit;   
end loop;     
  open mycur for  select * from  临时表表名;       
  CLOSE  CUR_1; 
  message :='查询临时表成功'; 
  EXCEPTION 
  WHEN OTHERS THEN 
   message :='查询临时表失败'; 
end  proc_XXX; 

参考更多
1 创建临时表,插入数据,返回结果集

Sql代码 
CREATE OR REPLACE PROCEDURE Report_Month_Responsibility( 
 o_cur OUT SYS_REFCURSOR 

IS 
STR VARCHAR2(200); 
tb_count INT; 
BEGIN 
  --先判断全局临时表是否存在,没存在则重新建立: 
  select count(*) into tb_count from dba_tables where table_name='REPROTTEST'; 
  if tb_count=0 then 
    STR:=' CREATE GLOBAL TEMPORARY TABLE REPROTTEST( 
           ID INT, 
           ANAME VARCHAR2(20) 
    ) ON COMMIT PRESERVE ROWS'; 
     execute immediate STR; 
  end if; 
   
  STR:='INSERT INTO REPROTTEST(ID,ANAME)  VALUES(1,''1'')'; 
  execute immediate STR; 
  COMMIT; 
  STR:='SELECT * FROM REPROTTEST'; 
  OPEN o_cur FOR STR; -- 给游标变量赋值 
END Report_Month_Responsibility; 

2 调用存储过程
Sql代码 
CREATE OR REPLACE PROCEDURE proc_X() 
IS 
  v_ID INT; 
  v_ANAME VARCHAR2(20);       
   --定义游标: 
   v_account_cur SYS_REFCURSOR; 
BEGIN 
     --调用存储过程: 
       Report_Month_Responsibility(v_account_cur);        
       fetch v_account_cur into v_ID,v_ANAME; 
      --用循环显示游标中的记录: 
       while v_account_cur%found loop 
             dbms_output.put_line('The value of column ID is: '||v_ID);--打引列ID 
             dbms_output.put_line('The value of column ANAME is: '||v_ANAME);   
             --打引列ANAME           
             fetch v_account_cur into v_ID,v_ANAME; 
       end loop; 
       close v_account_cur;     
       execute immediate 'truncate TABLE REPROTTEST';    
end proc_X; 

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