CREATE PROCEDURE loop_example AS BEGIN DECLARE @name VARCHAR(50) DECLARE @count INT DECLARE @i INT SELECT @count = COUNT(*) FROM table_name SET @i = 1 WHILE @i <= @count BEGIN SELECT @name = name FROM table_name WHERE id = @i 在这里对每一行的数据进行处理 可以使用变量@name来访问...
将select语句放入for循环是一种常见的数据库查询操作,它可以用于在数据库中根据特定条件进行多次查询。在这种情况下,for循环用于迭代查询结果集,并对每个结果执行相应的操作。 这种做法的优势在于...
select * from user_table; user1 user_table%rowtype; begin open user; loop fetch user into user1; exit when user%notfound; dbms_output.put_line('用户名称:' || user1.USER_NAME); dbms_output.put_line('用户年龄:' || user1.USER_AGE); end loop; close user; --关闭游标 end; 1. 2...
可选的REVERSE用于以相反的方向higher_bound .. lower_bound产生迭代。 ##FOR 光标循环 FOR 光标循环和FOR 数值循环很类似,只是循环是通过光标或者SELECT语句指定的。 FOR loop_record IN CURSOR LOOP sequence_of_statements; END LOOP; FOR loop_record IN (SELECT statement) LOOP sequence_of_statements; END ...
【如】输出从satrtIndex开始到endIndex的数字PROCEDURE display_number( startIndexININTEGER, endIndex IN INTEGER)ASBEGINFORcurrentIndexINstartIndex..endIndexLOOP DBMS_OUTPUT.PUT_LINE(currentIndex);END LOOP;END;FOR info IN (SELECT * FROM student)LOOP . . . info.C_NAMEEND LOOP;使用数字型FOR...
1DECLAREMy_CursorCURSOR--定义游标2FOR(SELECT*FROMdbo.MemberAccount)--查出需要的集合放到游标中3OPENMy_Cursor;--打开游标4FETCHNEXTFROM My_Cursor ;--读取第一行数据5WHILE@@FETCH_STATUS=06BEGIN7--UPDATE dbo.MemberAccount SET UserName = UserName + 'A' WHERE CURRENT OF My_Cursor; --更新8--DELE...
2 例二：使用LOOP循环 --- CREATE PROCEDURE TEST_LOOP LANGUAGE SQL BEGIN DECLARE code_v char(10); DECLARE salary_v integer; DECLARE city_v char(20);DECLARE C1 CURSOR FOR ---SELECT code,salary,city FROM employee WHERE city="Beijing"; OPEN C1; loop_label: LOOP ...
例二:使用LOOP循环 --- CREATE PROCEDURE QGPL/TEST_LOOP LANGUAGE SQL BEGIN DECLARE code_v char(10); DECLARE salary_v integer; DECLARE city_v char(20); DECLARE C1 CURSOR FOR ---SELECT code,salary,city FROM employee WHERE city="Beijing"; OPEN C1; loop_label: LOOP - FETCH C1 INTO ...
---SELECT * FROM code,salary,city from employee where city="Beijing" ---DO ---UPDATE employee ---SET salary=salary * 1.1 ---WHERE CURRENT OF cur01; ENDFOR; END; 例二:使用LOOP循环 --- CREATE PROCEDURE QGPL/TEST_LOOP LANGUAGE SQL BEGIN...
3;FETCHc_num3INTOv_num3;WHILEc_num3%FOUNDLOOP-- 能找到数据则执行循环内语句FETCHc_num3INTOv_num3;ENDLOOP;CLOSEc_num3;END;-- forDECLAREv_num2VARCHAR2(100);CURSORc_num2ISSELECTNAMEFROMtest_tWHEREROWNUM<600000;BEGINdbms_output.enable(800000);FORxINc_num2LOOPv_num2:=x.name;ENDLOOP;...