在使用loop的时候,使用到的labels标号,对于labels可以用到while,loop,rrepeat等循环控制语句中。而且有必要好好认识一下lables!! mysql> create procedure pro13() -> label_1:begin -> label_2:while 0=1 do leave label_2;end while; -> label_3:repeat leave label_3;until 0=0 end repeat; -> la...
[begin_label:] WHILE search_condition DO statement list END WHILE [end label] search_condition 参数表示循环执行的条件,满足该条件时循环执行; statement_list 参数表示循环的执行语句。WHILE 循环需要使用 END WHILE 来结束。 LOOP 语句 LOOP 语句可以使某些特定的语句重复执行。与 IF 和 CASE 语句相比,LOOP...
在这个示例中,循环会遍历数组 numbers 中的每个元素并输出其值。 4. While...End While 循环 While...End While 循环类似于 Do While...Loop,但在语法上略有不同。 语法 vb While condition ' 循环体 End While 示例 vb Dim counter As Integer = 0 While counter < 5 Console.WriteLine("Counter: " ...
End While End Sub End Module 在这个例子中,循环体将不会执行,如果 i 的初始值已经大于 5。 主要区别 语法差异:Do While 使用 Loop 关键字结束循环,而 While 使用 End While 结束循环。 使用习惯:Do While 通常用于需要在循环中控制退出条件的复杂逻辑,而 While 更简洁,适用于简单的条件检查。 总结 Do Whil...
END CASE; 1. 2. 3. 4. 5. 格式二: CASE WHEN expr_condition THEN statement_list [WHEN expr_condition THEN statement_list] [ELSE statement_list] END CASE; 1. 2. 3. 4. 5. 注意,这里介绍的用在存储过程中的CASE语句,与控制流程函数中的SQL CASE表达式中的CASE是不同的 。存储过程中,CASE语句...
To programmatically exit the loop, use a break statement. To skip the rest of the instructions in the loop and begin the next iteration, use a continue statement. When nesting a number of while statements, each while statement requires an end keyword. The MATLAB while loop is similar to a...
An aggregate may not appear in the set list of an UPDATE statement... An error occurred while executing batch. Error message is: Error creating window handle. SQL SERVER 2008 An error occurred while executing batch. Error message is: There is not enough space on the disk. An error occurred...
...end函数的值变得无效 do while语句 do while语句和while语句基本一致,唯一的区别在于不管条件的值如何,do while都会至少执行一次循环: do statement while...(condition); 跳转语句 1. break语句 break语句只能出现在迭代语句或者switch语句内部,负责终止离它最近的while、do while、for或switch语句。......
2. Awk Do While Loop Example: Print the message at least once $ awk 'BEGIN{ count=1; do print "This gets printed at least once"; while(count!=1) }' This gets printed at least once In the above script, the print statement, executed at least once, if you use the while statement,...
To programmatically exit the loop, use abreakstatement. To skip the rest of the instructions in the loop and begin the next iteration, use acontinuestatement. When nesting a number ofwhilestatements, eachwhilestatement requires anendkeyword. ...