Sql Server 中无则插入有则更新字段的示例代码 ifnotexists(select1from表名where条件='值')--无则插入INSERTINTO表名 ( 键1 , 键2, 键3 )VALUES('值1','值2','值3')else--有则更新UPDATE表名SET键1='值1', 键2='值2'WHERE条件='值'...
方法1:先查询,根据查询结果判断使用insert或者update IFEXISTS(SELECT1FROMtable_AWHEREId=@Id)BEGINUPDATEdbo.table_ASETValue=@ValueWHEREId=@Id;ENDELSEBEGININSERTINTOdbo.table_A (Id, Value)VALUES(@Id,@Value)END 方法2:先更新,根据更新结果影响的条目数判断是否需要插入 UPDATEdbo.table_ASETValue=@Value...
after insert, update, delete as if ((exists (select 1 from inserted)) and (exists (select 1 from deleted))) begin insert into log(action) values('updated'); end else if (exists (select 1 from inserted) and not exists (select 1 from deleted)) begin insert into log(action) values('...
IFEXISTS(SELECTCOUNT(*)FROMusersWHEREusername=@username)BEGIN-- 数据存在的情况下执行的操作PRINT'数据已存在';-- 可以在这里添加相关操作的代码UPDATEusersSET...WHEREusername=@username;ENDELSEBEGIN-- 数据不存在的情况下执行的操作PRINT'数据不存在';-- 可以在这里添加相关操作的代码INSERTINTOusers(username,....
如果已有值存在,则使用UPDATE语句更新该值;如果不存在,则执行INSERT语句插入新的值。 以下是一个示例存储过程的代码,用于实现这个功能: 代码语言:txt 复制 CREATE PROCEDURE UpdateOrInsertData @id INT, @value VARCHAR(50) AS BEGIN IF EXISTS (SELECT * FROM YourTable WHERE id = @...
SQL Server 查询: IF (EXISTS (SELECT * FROM failed_logins_ip_address WHERE ip_address = 'xxx')) BEGIN UPDATE failed_logins_ip_address SET attempts_count = attempts_count + 1, attempt_datetime = CURRENT_TIMESTAMP WHERE ip_address = 'xxx' ...
SQL Server的INSERT或UPDATE解决方案有多种方法,下面将详细介绍一些最常用的方法: 1. 使用“ON DUPLICATE KEY UPDATE”子句: 该方法通过在INSERT操作中使用ON DUPLICATE KEY UPDATE来避免插入冲突,如果插入的记录已经存在,则将其覆盖。这种方法的优点是简单明了,但可能不适用于复杂的逻辑。
CREATE PROCEDURE Usp_yoursp @Key VARCHAR(50), @Name VARCHAR(50) AS BEGIN -- SET NOCOUNT ON added to prevent extra result sets from SET NOCOUNT ON; IF EXISTS (SELECT 1 FROM yourtable WHERE KEY = @Key) UPDATE aTable SET Name = @Name ELSE INSERT INTO aTable ([Key], [Name]) VALUES...
but i'm not using my sql.it's sql server 2005!. Anonymous February 28, 2010 Just for sake of completeness 2 things Isnt Update a Blocking call? In case the user expect most of the time Insert will happen he should go with if exists(select) insert else update. Also in some cases on...
to be updated if it already exists and inserted if it does not. If we refer to the Books Online documentation, it gives examples that are similar to: IF EXISTS (SELECT * FROM Table1 WHERE Column1='SomeValue') UPDATE Table1 SET (...) WHERE Column1='SomeValue' ELSE INSERT INTO Table...