数据库存储过程实现增删改差（SQL SERVER 2008）

CREATE TABLE [dbo].[szsj_message_list](
    [id] [int] IDENTITY(1,1) NOT NULL,
    [name] [nvarchar](32) NULL,
    [message] [nvarchar](256) NOT NULL,
    [create_by] [nvarchar](32) NOT NULL,
    [create_date] [datetime] NOT NULL,
    [update_by] [nvarchar](32) NULL,
    [update_date] [datetime] NULL
) ON [PRIMARY]

CREATE PROCEDURE [dbo].[Op_Announce_Info]
 
 @I_flag nvarchar(32),
 @id nvarchar(32),
 @title nvarchar(128),
 @content nvarchar(2048),
 @files nvarchar(32),
 @create_by nvarchar(32),
 @create_date nvarchar(32)
 
AS
 
BEGIN  
 if @I_flag = ‘insert‘
   begin
INSERT INTO szsj_announce_info
           (title
           ,content
           ,files
           ,create_by
           ,create_date)
     VALUES
           (@title,
 @content,
 @files,
 @create_by,
 GETDATE());
   end
   
 if @I_flag = ‘update‘
   begin
     update szsj_announce_info 
        set title = @title,
            content = @content,
            files = @files,
            update_by = @create_by,
            update_date = GETDATE()
      where id = @id;
   end
   
 if @I_flag = ‘updatetimes‘
   begin
     update szsj_announce_info 
        set times = isnull(times,0) + 1
      where id = @id;
   end
   
 if @I_flag = ‘del‘
   begin
     delete szsj_announce_info where id = @id;
   end
   
 if @I_flag = ‘show‘
   begin
     select * from szsj_announce_info where create_date between GETDATE()-15 and GETDATE();
   end
   
 if @I_flag = ‘select‘
  declare @sql NVARCHAR(MAX);
  set @sql = ‘select * from szsj_announce_info where 1=1 ‘
  begin
   if LEN (@id) > 0
  begin
    set @sql = @sql + ‘ and id = ‘‘‘ + @id + ‘‘‘‘ ;
  end
   
   if LEN (@create_date) > 0
  begin
    set @sql = @sql + ‘ and CONVERT(date,create_date,120) = convert(date,‘‘‘ + @create_date + ‘‘‘,120)‘ ;
  end
  
   if LEN (@title) > 0
  begin
    set @sql = @sql + ‘ and title like ‘‘%‘ + @title + ‘%‘‘‘ ;
  end
  EXEC sp_executesql @sql;
  end
 
END