Question

可能重复：
Select / Insert version of an Upsert: is there a design pattern for high concurrency?

我必须根据条件将数据从一个表插入另一个表。

1.If Key is found update records
2.If key is not found insert the record.

我正在使用sql server 2005.所以不能使用merge语句。请建议实现此目的的替代方案

Answer 1

从SourceTable复制到DesitinationTable：

update  dst
set     col1 = src.col1
from    DestinationTable dst
join    SourceTable src
on      src.Key = dst.Key

insert  DestinationTable 
        (Key, col1)
select  Key
,       col1
from    SourceTable src
where   not exists
        (
        select  *
        from    DestinationTable dst
        where   src.Key = dst.Key
        )

Answer 2

IF EXISTS(--Query to check for the existence of your condition here)
BEGIN
  --UPDATE HERE
END ELSE
BEGIN
  --INSERT HERE
END

Answer 3

以下是my answer to the similar question

中的存储过程示例

   CREATE PROCEDURE dbo.update_table1 
    @Field1 int, --key1
    @Field2 int, --data fields
    @Field3 int, 
    @Field4 int

    AS

    SET NOCOUNT ON
    update table1 set Field2=@Field2,Field3=@Field3,Field4=@Field4 
            where Field1=@Field1;
    IF(@@Rowcount=0)
    BEGIN
         insert into table1(Field1,Field2,Field3,Field4) 
                    values (@Field1,@Field2,@Field3,@Field4);
    END
    GO

在sql server 2005中的一个查询中插入和更新

3 个答案: