/*定期删除数据存储过程*/
CREATE PROCEDURE sp_DeleteOldData_Batch
    @BatchSize INT = 10000,      -- 每批删除的行数
    @DelayMs INT = 100           -- 每批之间的延迟（毫秒）
AS
BEGIN
    SET NOCOUNT ON;
    
    DECLARE @TotalDeleted INT;
    DECLARE @BatchDeleted INT;
    DECLARE @CutoffDate DATETIME;
    DECLARE @StartTime DATETIME;
    DECLARE @DelayTime VARCHAR(12);
    
    SET @CutoffDate = DATEADD(YEAR, -1, GETDATE());
    SET @StartTime = GETDATE();
    
    PRINT '开始删除一年前的数据，截止时间：' + CONVERT(VARCHAR, @CutoffDate, 120);
    
    BEGIN TRY
        -- ============ 删除 BlankingData ============
        SET @TotalDeleted = 0;
        SET @BatchDeleted = 1;
        
        PRINT '开始删除 BlankingData 表数据...';
        
        WHILE @BatchDeleted > 0
        BEGIN
            DELETE TOP (@BatchSize) FROM dbo.BlankingData 
            WHERE OutTime < @CutoffDate;
            
            SET @BatchDeleted = @@ROWCOUNT;
            SET @TotalDeleted = @TotalDeleted + @BatchDeleted;
            
            -- 每批之间短暂延迟，减少锁争用
            IF @BatchDeleted > 0 AND @DelayMs > 0
            BEGIN
                SET @DelayTime = '00:00:00.' + RIGHT('000' + CAST(@DelayMs AS VARCHAR(3)), 3);
                WAITFOR DELAY @DelayTime;
            END
        END
        
        PRINT 'BlankingData 表删除完成，共删除 ' + CAST(@TotalDeleted AS VARCHAR) + ' 行。';
        
        
        -- ============ 删除 FeedingData ============
        SET @TotalDeleted = 0;
        SET @BatchDeleted = 1;
        
        PRINT '开始删除 FeedingData 表数据...';
        
        WHILE @BatchDeleted > 0
        BEGIN
            DELETE TOP (@BatchSize) FROM dbo.FeedingData 
            WHERE CreateTime < @CutoffDate;
            
            SET @BatchDeleted = @@ROWCOUNT;
            SET @TotalDeleted = @TotalDeleted + @BatchDeleted;
            
            IF @BatchDeleted > 0 AND @DelayMs > 0
            BEGIN
                SET @DelayTime = '00:00:00.' + RIGHT('000' + CAST(@DelayMs AS VARCHAR(3)), 3);
                WAITFOR DELAY @DelayTime;
            END
        END
        
        PRINT 'FeedingData 表删除完成，共删除 ' + CAST(@TotalDeleted AS VARCHAR) + ' 行。';
        
        
        -- ============ 删除 tb_alarm ============
        SET @TotalDeleted = 0;
        SET @BatchDeleted = 1;
        
        PRINT '开始删除 tb_alarm 表数据...';
        
        WHILE @BatchDeleted > 0
        BEGIN
            DELETE TOP (@BatchSize) FROM dbo.tb_alarm 
            WHERE EndTime < @CutoffDate;
            
            SET @BatchDeleted = @@ROWCOUNT;
            SET @TotalDeleted = @TotalDeleted + @BatchDeleted;
            
            IF @BatchDeleted > 0 AND @DelayMs > 0
            BEGIN
                SET @DelayTime = '00:00:00.' + RIGHT('000' + CAST(@DelayMs AS VARCHAR(3)), 3);
                WAITFOR DELAY @DelayTime;
            END
        END
        
        PRINT 'tb_alarm 表删除完成，共删除 ' + CAST(@TotalDeleted AS VARCHAR) + ' 行。';
        
        PRINT '所有表数据删除完成，总耗时：' + 
              CAST(DATEDIFF(SECOND, @StartTime, GETDATE()) AS VARCHAR) + ' 秒。';
              
    END TRY
    BEGIN CATCH
        PRINT '数据删除失败：' + ERROR_MESSAGE();
        THROW;
    END CATCH
END
GO