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How to write declare loop in oracle

Apr 30, 2024 am 06:18 AM
oracle

DECLARE 循环是一种 Oracle PL/SQL 块中显式迭代语句,用于重复执行一组语句。语法:DECLARE - 声明循环变量其数据类型BEGIN - 初始化循环变量LOOP - 循环体包含要执行的语句EXIT WHEN - 指定退出循环条件END LOOPEND

How to write declare loop in oracle

Oracle 中 DECLARE 循环

DECLARE 循环是一种显式迭代语句,允许在 Oracle PL/SQL 块中重复执行一组语句。

语法:

<code>DECLARE
  -- 循环变量声明
  <循环变量> <数据类型>;
BEGIN
  -- 初始化循环变量
  <循环变量> := <初始值>;
  
  -- 循环体
  LOOP
    -- 要重复执行的语句
    
    -- 循环变量更新
    <循环变量> := <更新表达式>;
    
    EXIT WHEN <退出条件>;
  END LOOP;
  
  -- 循环体外的其他语句
END;</code>
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示例:

DECLARE
  i NUMBER;
BEGIN
  i := 1;
  
  LOOP
    -- 打印数字
    DBMS_OUTPUT.PUT_LINE(i);
    
    -- 递增循环变量
    i := i + 1;
    
    -- 退出条件:当 i 大于 10 时退出循环
    EXIT WHEN i > 10;
  END LOOP;
  
  -- 循环体外的其他语句
END;
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注意事项:

  • 必须声明循环变量及其数据类型。
  • 必须初始化循环变量。
  • 循环体必须包含更新循环变量的语句。
  • 退出条件是可选的。如果没有指定,循环将无限执行。
  • 可以在循环体中使用 EXIT 语句显式退出循环。
  • 可以在循环体外执行其他语句,这些语句将在循环完成执行后执行。

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