CURSOR <游标名称> IS <游标名称>%ROWTYPE; BEGIN OPEN <游标名称> LOOP FETCH <游标名称> INTO ; EXIT WHEN <游标名称>%NOTFOUND; <其它要执行的代码> END LOOP; CLOSE <游标名称>; END <存储过程名称>; / 代码例子: 复制内容到剪贴板 程序代码 TRUNCATE TABLE loop_test; DECLARE CURSOR ao_cur IS ...
CURSOR <游标名称> IS <游标名称>%ROWTYPE; BEGIN OPEN <游标名称> LOOP FETCH <游标名称> INTO ; EXIT WHEN <游标名称>%NOTFOUND; <其它要执行的代码> END LOOP; CLOSE <游标名称>; END <存储过程名称>; / 代码例子: 复制内容到剪贴板 程序代码 TRUNCATE TABLE loop_test; DECLARE CURSOR ao_cur IS ...
这里严格按照显示游标的书写规则:DECLARE emp_cursor定义游标OPEN emp_cursor打开游标FETCH emp_cursor INTO...提取数据CLOSE emp_cursor关闭游标,因为提取出来的数据属于多行,所以通过loop循环打印即可。 Example2:检验游标是否打开,如果打开显示提取行数 DECLARE CURSOR emp_cursor IS SELECT empno,ename,job FROM emp;...
The index of the record. cursor_name The name of the cursor that you wish to fetch records from. statements The statements of code to execute each pass through the CURSOR FOR LOOP.Example Here is an example of a function that uses a CURSOR FOR LOOP: CREATE OR REPLACE Function TotalIncome...
END LOOP; Example 1: Cursor For Loop With Simple Explicit Cursor SET SERVEROUTPUT ON; DECLARE CURSOR cur_RebellionRider IS SELECT first_name, last_name FROM employees WHERE employee_id >200; BEGIN FOR L_IDX IN cur_RebellionRider LOOP DBMS_OUTPUT.PUT_LINE(L_IDX.first_name||' '||L_IDX...
// fetch again. 下面做一个很简单的实验解释这个bug。 准备脚本test1.sql: DECLARE cursor c1 is select rowid from test1 where ROWNUM <= 50000; cnt number(38); begin cnt := 0; for c1rec in c1 loop delete from test1 where rowid = c1rec.rowid; ...
CURSOR <游标名称> IS <游标名称>%ROWTYPE; BEGIN OPEN <游标名称> LOOP FETCH <游标名称> INTO ; EXIT WHEN <游标名称>%NOTFOUND; <其它要执行的代码> END LOOP; CLOSE <游标名称>; END <存储过程名称>; / 代码例子: 复制内容到剪贴板 程序代码 ...
13.2.2 游标中的loop语句 13.2.3 使用bulk collect和for语句的游标游标中通常使用fetch into 语句提取数据,这种方式是单条数据提取,但是在数据量很大的情况下执行效率不是很理想。而此时引用fetch bulk collect into语句可以批量提取数据,在数据量大的情况下它的执行效率比单条提取数据的高。语法如图所示。 13.2.3 使...
It performs a cursor loop on the unpublished records on the SHIPMENT_PUB_INFO table (PUB_STATUS = 'U'). It should only need to execute one loop iteration in most cases. For each record retrieved, GETNXT gets the following: 1. A lock of the queue table for the current business objects...
CREATE GLOBAL TEMPORARY TABLE lossytable (val NUMBER, freq NUMBER, bk NUMBER); create or replace procedure find_topn(nm_rws integer,tpk integer) is CURSOR c_chk (cval NUMBER) IS SELECT * FROM lossytable WHERE val = cval; chk c_chk%ROWTYPE; n INTEGER := 0; delta NUMBER := 0; b...