/* Open up a cursor for loop, also selecting * the "p" function which will write rows to * t2 for every row fetched from t1. */ FOR crec IN (Select tcol, p(tcol) FROM t1) LOOP -- Break out of the loop immediately EXIT; END LOOP; END; / Select COUNT(*) FROM t2; 注意:%...
/* Open up a cursor for loop, also selecting * the "p" function which will write rows to * t2 for every row fetched from t1. */ FOR crec IN (Select tcol, p(tcol) FROM t1) LOOP -- Break out of the loop immediately EXIT; END LOOP; END; / Select COUNT(*) FROM t2; 注意:%...
Example Here is an example of a function that uses a CURSOR FOR LOOP: CREATE OR REPLACE Function TotalIncome ( name_in IN varchar2 ) RETURN varchar2 IS total_val number(6); cursor c1 is SELECT monthly_income FROM employees WHERE name = name_in; BEGIN total_val := 0; FOR employee_...
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;(...
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...
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 ...
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.last_name)...
ENDLOOP; CLOSEcur; END; 1.1、带参数的显式游标：参数不需指定长度或者精度。 1.2、FOR循环游标：采用遍历方式，自动打开、提取和关闭游标。（能否利用%ROWCOUNT获得游标提取的行数？） DECLARE /*定义带参数游标*/ CURSORcur_para(idvarchar2)IS SELECTbooks_nameFROMbooksWHEREbooks_id=id; BGEIN /*...
CURSOR c_emp IS SELECT empno, ename, sal FROM emp; v_empno emp.empno%TYPE; v_ename emp.ename%TYPE; v_sal emp.sal%TYPE; BEGIN OPEN c_emp; LOOP FETCH c_emp INTO v_empno, v_ename, v_sal; EXIT WHEN c_emp%NOTFOUND; DBMS_OUTPUT.PUT_LINE(v_empno || ' ' || v_ename || ' ...
CLOSE_CURSOR 使用DBMS_SQL执行DML语句 删除行的例子 CREATEORREPLACEFUNCTIONdelete_all_rows(table_nameVARCHAR2)RETURNNUMBERIScsr_idINTEGER;rows_delNUMBER;BEGINcsr_id:=DBMS_SQL.OPEN_CURSOR;DBMS_SQL.PARSE(csr_id,'DELETE FROM '||table_name,DBMS_SQL.NATIVE);rows_del:=DBMS_SQL.EXECUTE(csr_id);DBMS...