CACHE 10; CREATE OR REPLACE TRIGGER TR_USER BEFORE INSERT ON TB_USER FOR EACH ROW BEGIN SELECT SEQ_USER.NEXTVAL INTO :NEW.ID FROM DUAL; END; 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 然后,用loop循环来插入数据: DECLARE V_AGE TB_USER.USER_AGE...
FOR loop_counter IN [REVERSE] lowest_number..highest_number LOOP {.statements.} END LOOP; You would use a FOR Loop when you want to execute the loop body a fixed number of times. 译:当你需循环体执行一定的次数的时候,就可以使用FOR Loop。 Let's take a look at an example. FOR Lcntr ...
分支结构语法:IF、CASE; 循环结构:FOR、WHILE LOOP:先执行再判断,至少执行一次; WHILE LOOP:先判断再执行,如果不满足条件,就不执行 FOR循环:已知要循环的次数. 如果明确知道循环次数,使用FOR循环; 如果不知道循环次数,但是知道循环结束条件,使用LOOP循环. 循环控制:EXIT与CONTINUE语句完成。PL...
Optional. If specified, the loop counter will count in reverse. lowest_number The starting value forloop_counter. highest_number The ending value forloop_counter. statements The statements of code to execute each pass through the loop.
PLSQLFORLOOP循环语句 PLSQLFORLOOP循环语句 FOR LOOP语句是⼀种重复控制结构，可以有效地编写⼀个需要执⾏特定次数的循环。语法 下⾯演⽰如何使⽤FOR LOOP语句 - FOR counter IN initial_value .. final_value LOOP sequence_of_statements;END LOOP;以下是FOR循环中的控制流程 - ⾸先执⾏初始步骤...
BEGINFORl_counterIN1..5LOOPDBMS_OUTPUT.PUT_LINE( l_counter );ENDLOOP;END;Code language:SQL (Structured Query Language)(sql) Here is the result: B) Simulating STEP clause in FOR LOOP statement The loop index is increased by one after each loop iteration and you cannot change the increment...
Foreach 循环容器不提供任何功能,只提供用以生成可重复的控制流、指定枚举器类型以及配置枚举器的结构。 若要提供容器功能,Foreach Loop 循环容器中必须包含至少一个任务。 有关详细信息,请参阅Integration Services Tasks。 Foreach 循环容器可包含具有多个任务和其他容器的控制流。 除了要将任务和容器拖动到 Foreach...
(a)、loop 循环 declare -- 求和变量 i变量 1., PL/SQL脚本语言循环loop for while的用法学习示例 。100 v_sum number(5); v_i number(5); begin v_sum :=0; v_i := 1; loop v_sum := v_sum + v_i; v_i := v_i+1; exit when v_i>100; --退出条件 ...
Oracle/PLSQL: FOR Loop: http://www.techonthenet.com/oracle/loops/for_loop.php Loops with PL/SQL: http://www.adp-gmbh.ch/ora/plsql/loops.html The syntax for the FOR Loop is: FOR loop_counter IN [REVERSE] lowest_number..highest_number LOOP {.statements.} END LOOP; You would...
set serveroutput on; DECLARE num int:=1; BEGIN while(num <= 10) LOOP dbms_output.put_line(''|| no); num := num+2; END LOOP; END; 1 3 5 7 9 PL/SQL procedure successfully completed. NOTE: You must write the code to increment the value of the variable that you put in the ...