/* 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_...
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)...
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;(...
Cursor Loop 显示声明游标及记录组 格式: 复制内容到剪贴板 程序代码 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>; ...
Example:使用游标For循环打印输出员工信息: DECLARE CURSOR emp_cursor IS SELECT empno,ename,job FROM emp; BEGIN FOR emp_record IN emp_cursor LOOP DBMS_OUTPUT.PUT_LINE('员工号:'||emp_record.empno||'员工姓名'||emp_record.ename||'员工职位'||emp_record.job); END LOOP; END; ...
SQL隐式游标和cursor for游标是Oracle内置的游标。SQL游标与当前会话有关。当前会话中的更新(update)、删除操作都会影响SQL隐式游标的属性。cursor for游标用于循环。 13.3.2 隐式游标的属性 下面来介绍sql隐式游标的属性,如表所示。 方法 功能 sql%isopen 判断当前游标是否打开。如果打开,该属性值为true,否则为...
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...
当value值列表中有一个为NULL,则返回NULL值。 EXAMPLE: select greatest (1, 3, 2 ) from dual ; — 返回3 select greatest ( 'A’, 'B’, 'C’ ) from dual ; — 返回C select greatest (null, 'B’, 'C’ ) from dual ; — 返回null ...