日期:2014-05-17  浏览次数:21226 次

在游标中可以使用变量作为表名吗?
我的目的就是希望可以在存储过程的参数中传递表的名称,然后在存储过程内定义游标的时候,根据表的名字来查询,这个可以做到吗?如下:

create or replace procedure case_to_province(table_name in varchar2, id_name in varchar2) as
  cursor cur is
  select * from table_name;

begin

  for rec in cur loop

  ……

我希望可以实现类似这种语句片段的效果,当然,上面的写法是错误的。还请大家给与帮助,非常感谢。


------解决方案--------------------
strCursorSql := 'select distinct ' || secondField || ' from ' || strTable;
OPEN cur FOR strCursorSql;
loop
Fetch cur into secondFieldValue;
Exit when cur%notfound;
...
end loop;
------解决方案--------------------
SQL code

CREATE OR REPLACE PROCEDURE TEST_1 (P_IN_TBNAME IN VARCHAR2) IS
  REF_CUR SYS_REFCURSOR ;
  V_SQL   VARCHAR2(2000) ;
  V_ROWID ROWID ;
BEGIN
  V_SQL := 'SELECT ROWID FROM '|| P_IN_TBNAME  ;
  OPEN REF_CUR FOR V_SQL ;
  LOOP
  FETCH REF_CUR INTO V_ROWID;
  EXIT WHEN REF_CUR%NOTFOUND;
  DBMS_OUTPUT.PUT_LINE(V_ROWID) ;
  END LOOP ;
  --business process 
  CLOSE REF_CUR ;
EXCEPTION 
  WHEN OTHERS THEN
    --exception handle
    RAISE ;
END ;
/
SQL> CREATE TABLE TST1 (X INT) ;
 
Table created
 
SQL> INSERT INTO TST1 VALUES (1) ;
 
1 row inserted
 
SQL> SET SERVEROUTPUT ON ;
SQL> EXEC TEST_1('TST1') ;
 
AAATeuAAHAAAAuHAAA
 
PL/SQL procedure successfully completed

------解决方案--------------------

根据LZ的意思大概改成这样子。。
SQL code
create or replace procedure case_to_province(table_name in varchar2, id_name in varchar2) 
  declare cur is ref cursor ;
v_id table_name.id%type;
 test_cursor cur;
 begin
open test_cursor for  select id from table_name where name=id_name; 

loop 
fetch test_coursor in v_id;
exit when test_cursor%not found;
end loop;
end;
/