declarel_sqlvarchar2(123);--variable that contains a queryl_c sys_refcursor;--cursor variable(weak cursor).l_res your_table%rowtype;--variable containing fetching databeginl_sql :='select * from your_table';--Open the cursor and fetching data explicitly--in the LOOP.openl_cforl_sql; ...
open mycursor; loop fetch mycursor into v_tablename,v_tabletype; null; --you can use tablename and v_tabletype end loop; close mycursor; end StudyCursor; 最近在看代码是,发现其实我们还有一个更方便的方法就是使用for in loop … end loop create or replace procedure StudyFor( resulst out ...
CREATE OR REPLACE PROCEDURE p_test_emp is CURSOR c1 is select empno, ename from emp;t_c1 c1%rowtype;err exception;begin open c1;loop FETCH c1 INTO t_c1;if (c1%found) then insert into emp_test (empno, ename) values (t_c1.empno, t_c1.ename);commit;else raise err;(...
As the name suggests Cursor For Loop is a type of For loop provided by oracle PL/SQL which makes working with cursors in oracle database a lot easier by executing OPEN, FETCH & CLOSE Cursor statements implicitly in the background for you....
loop--提取一行数据到c_rowfetchc_jobintoc_row;--判读是否提取到值,没取到值就退出--取到值c_job%notfound 是false--取不到值c_job%notfound 是trueexitwhenc_job%notfound;dbms_output.put_line(c_row.empno||'-'||c_row.ename||'-'||c_row.job||'-'||c_row.sal);endloop;--关闭游标...
In this case, the cursorFOR LOOPdeclares, opens, fetches from, and closes an implicit cursor. However, the implicit cursor is internal; therefore, you cannot reference it. Note that Oracle Database automatically optimizes a cursorFOR LOOPto work similarly to aBULK COLLECTquery. Although your co...
ORACLE中用for in 使用cursor CURSOR cur IS SELECT * FROM xxx; FOR cur_result in cur LOOP BEGIN V_SUM :=cur_result.列名1+cur_result.列名2 END; END LOOP; END; 中的CURSOR cur IS得到的是什么? 用for in 能够得到什么? 答: CURSOR cur IS是定义一个游标,然后把游标里定义的查询语句存储到...
Note that thenext()andprev()methods return the first or last value respectively for an uninitialized cursor. This allows the loop in the example above to be rewritten as follows: EntityCursor<Employee>cursor = primaryIndex.entities();
Oracle Mutex 机制 说明 To improve cursor execution and also hard parsing, a new memory serialization mechanism has been created in 10gR2. For certain shared-cursor related operations, mutexes are used as a replacement for library cache latches and librarycache pins. ...
(cur SYS_REFCURSOR, mgr_hiredate DATE) RETURN NUMBER IS emp_hiredate DATE; before number :=0; after number:=0; begin loop fetch cur into emp_hiredate; exit when cur%NOTFOUND; if emp_hiredate > mgr_hiredate then after:=after+1; else before:=before+1; end if; end loop; close ...