-- loop DECLARE v_num VARCHAR2(100); CURSOR c_num IS SELECT NAME FROM test_t WHERE ROWNUM < 600000; BEGIN dbms_output.enable(800000); OPEN c_num; LOOP FETCH c_num INTO v_num; EXIT WHEN c_num%NOTFOUND; --未找到数据 END LOOP; CLOSE c_num; END; -- while DECLARE v_num3 VARCH...
在Case函数中,可以使用BETWEEN,LIKE,IS NULL,IN,EXISTS等等,通过在Case函数中嵌套Case函数,在合计函数中使用Case函数等方法,也可以在Check、触发器等中使用Case。 2、循环分支For和While 2.1For循环 for 变量 in 开始数值...结束数值 loop end loop; 1. 2.2While循环 只要表达式成立就执行循环语句 **while** 条...
END WHILE while_label; SET num=s; END%%DELIMITER ; CALL test_while(@x); SELECT @x; 跳转语句之ITERATE语句 ITERATE语句:只能用在循环语句(LOOP、REPEAT和WHILE语句)内,表示重新开始循环,将执行顺序转到语句段开头处。如果你有面向过程的编程语言的使用经验,你可以把 ITERATE 理解为 continue,意思为 再次循环。
DECLARE@EmployeeNameVARCHAR(50),@SalaryDECIMAL(10,2)DECLAREEmployeeCursorCURSORFORSELECTName,SalaryFROMEmployeesOPENEmployeeCursorFETCHNEXTFROMEmployeeCursorINTO@EmployeeName,@SalaryWHILE@@FETCH_STATUS=0BEGINPRINT'Employee Name: '+@EmployeeName+', Salary: '+CAST(@SalaryASVARCHAR)FETCHNEXTFROMEmployeeCursorINT...
CURSOR FOR Loop FOR employee_rec in c1 ---employee_rec直接用,不用提前定义 LOOP total_val := total_val + employee_rec.monthly_income; END LOOP; 当使用CURSOR FOR Loop时,不用我手工open cursor close cursor 应用: begin FOR emm IN ( SELECT ro_site, ns_site, product_line, wh_type ...
3 例三：使用WHILE循环 --- CREATE PROCEDURE TEST_WHILE LANGUAGE SQL BEGIN DECLARE code_v char(10); DECLARE salary_v integer; DECLARE city_v char(20); DECLARE at_end integer;DECLARE C1 CURSOR FOR ---SELECT code,salary,city FROM employee WHERE city="Beijing"; OPEN...
• The simple or infinite loop • The FOR loop (numeric and cursor) • The WHILE loop The simple loop It’s called simple for a reason: it starts simply with the LOOP keyword and ends with the END LOOP statement. The loop will terminate if you execute an EXIT, ...
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...
deallocatecursor1 其中while循环的判断条件: @@FETCH_STATUS =0 FETCH 语句成功 @@FETCH_STATUS =-1 FETCH 语句失败或此行不在结果集中 @@FETCH_STATUS =-2 被提取的行不存在 二、我常用的一般格式: DECLARE 游标名称 CURSOR FOR SELECT * FROM 表名 WHERE ... ...
OPENemail_cursor;loop_label:LOOPFETCHemail_cursorINTOemp_email;IFfinished=1THENLEAVEloop_label;ENDIF;SETemail_list=CONCAT(emp_email,';',email_list);ENDLOOPloop_label;CLOSEemail_cursor;END//DELIMITER;SET@email_list='';#在这里而不是循环中SET参数值,使得使用更加灵活#SET @email_list='vladimir_...