事务实例

BEGIN TRY  
    BEGIN TRANSACTION  --开始事务
    DECLARE @myMemberID NVARCHAR(36) ,--用户ID
        @myBizID NVARCHAR(36) ,
        @myBizType NVARCHAR(36) ,
        @myZanNum BIGINT

 --业务ID            
    SET @myMemberID = '773415785c964cf89ad40528228f111b'
    SET @myBizID = 'B6C0738D-CDDC-4361-964B-870FAA795FD2'
    SET @myBizType = '0601'
--根据点赞状态更新主表点赞数量
    UPDATE  [D_Activity]
    SET     ZanNum = CASE WHEN ( SELECT IsDel
                                 FROM   dbo.D_MemberAdmire
                                 WHERE  MemberID = @myMemberID
                                        AND BizID = @myBizID
                               ) = 0 THEN ZanNum - 1--记录为0,-1
                          ELSE ISNULL(ZanNum + 1, 1)
                     END --没有记录记录为1,+1
    WHERE   ID = @myBizID    
--如果存在点赞记录更新,否者插入              
    IF EXISTS ( SELECT  1
                FROM    D_MemberAdmire
                WHERE   MemberID = @myMemberID
                        AND BizID = @myBizID ) 
        UPDATE  dbo.D_MemberAdmire
        SET     IsDel = CASE WHEN IsDel = 1 THEN 0
                             ELSE 1
                        END--1变0,0变1
        WHERE   MemberID = @myMemberID
                AND BizID = @myBizID;     

                                         
    ELSE 
        INSERT  INTO D_MemberAdmire
                ( ID ,
                  BizType ,
                  BizID ,
                  MemberID ,
                  Status ,
                  IsDel
                    
                )
        VALUES  ( NEWID() ,
                  @myBizType ,
                  @myBizID ,
                  @myMemberID ,
,
 
                )
    COMMIT TRANSACTION --提交事务
END TRY
BEGIN CATCH --抓取异常
    ROLLBACK TRANSACTION --回滚事务
END CATCH