没有初始化变量,或者变量null而用了+后会出现之后的问题
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- sql 2005问题
ALTER proc AddRevmeeting(@meetingId varchar(6),@fromtime datetime,@totime datetime,
@content varchar(50),@userName varchar(12),@node varchar(50),
@str varchar(200) output
)
asDECLARE @rId char(6)
DECLARE @rmeetingId char(6)
DECLARE @rfromtime datetime
DECLARE @rtotime datetime
DECLARE @rcontent varchar(50)
DECLARE @ruserName varchar(12)/*set @str=null*/
/*set nocount on*/
select @str=Id,@rmeetingId=meetingId,@rfromtime=fromtime,@rtotime=totime,
@rcontent=content,@ruserName=userName from Revmeeting where meetingId=@meetingId
/*and(fromtime<=@totime and totime>=@fromtime )*/
if(@@rowcount>0)
begin
set @str='預定發生衝突,沖突記錄如下:\r\n會議編號:'+@rId+
'\r\n會議室編號:'+isnull(@rmeetingId,'')+
'\r\n預定時間:'+cast(isnull(@rfromtime,'') as varchar)+
'\r\n結束時間:'+cast(isnull(@rtotime,'') as varchar)+
'\r\n會議名稱:'+isnull(@rcontent,'')+
'\r\n預定人:'+isnull(@ruserName,'')+'.'
select @str
return 1
end
else
insert into Revmeeting values(@meetingId,@fromtime,@totime,
@content,@userName,@node)
@content varchar(50),@userName varchar(12),@node varchar(50),
@str varchar(200) output
)
asDECLARE @rId char(6)
DECLARE @rmeetingId char(6)
DECLARE @rfromtime datetime
DECLARE @rtotime datetime
DECLARE @rcontent varchar(50)
DECLARE @ruserName varchar(12)/*set @str=null*/
/*set nocount on*/
select @str=Id,@rmeetingId=meetingId,@rfromtime=fromtime,@rtotime=totime,
@rcontent=content,@ruserName=userName from Revmeeting where meetingId=@meetingId
/*and(fromtime<=@totime and totime>=@fromtime )*/
if(@@rowcount>0)
begin
set @str='預定發生衝突,沖突記錄如下:\r\n會議編號:'+isnull(@rId,'')+
'\r\n會議室編號:'+isnull(@rmeetingId,'')+
'\r\n預定時間:'+cast(isnull(@rfromtime,'') as varchar)+
'\r\n結束時間:'+cast(isnull(@rtotime,'') as varchar)+
'\r\n會議名稱:'+isnull(@rcontent,'')+
'\r\n預定人:'+isnull(@ruserName,'')+'.'
select @str
return 1
end
else
insert into Revmeeting values(@meetingId,@fromtime,@totime,
@content,@userName,@node)
1 :普通SQL语句可以用Exec执行 eg: Select * from tableName
Exec('select * from tableName')
Exec sp_executesql N'select * from tableName' -- 请注意字符串前一定要加N 2:字段名,表名,数据库名之类作为变量时,必须用动态SQL eg:
declare @fname varchar(20)
set @fname = 'FiledName'
Select @fname from tableName -- 错误,不会提示错误,但结果为固定值FiledName,并非所要。
Exec('select ' + @fname + ' from tableName') -- 请注意 加号前后的 单引号的边上加空格 当然将字符串改成变量的形式也可
declare @fname varchar(20)
set @fname = 'FiledName' --设置字段名 declare @s varchar(1000)
set @s = 'select ' + @fname + ' from tableName'
Exec(@s) -- 成功
exec sp_executesql @s -- 此句会报错 declare @s Nvarchar(1000) -- 注意此处改为nvarchar(1000)
set @s = 'select ' + @fname + ' from tableName'
Exec(@s) -- 成功
exec sp_executesql @s -- 此句正确 3. 输出参数
declare @num int,
@sqls nvarchar(4000)
set @sqls='select count(*) from tableName'
exec(@sqls)
--如何将exec执行结果放入变量中? declare @num int,
@sqls nvarchar(4000)
set @sqls='select @a=count(*) from tableName '
exec sp_executesql @sqls,N'@a int output',@num output
select @num
ALTER proc AddRevmeeting(@meetingId varchar(6),@fromtime datetime,@totime datetime,
@content varchar(50),@userName varchar(12),@node varchar(50),
@str varchar(200) output
)
asDECLARE @rId char(6)
DECLARE @rmeetingId char(6)
DECLARE @rfromtime datetime
DECLARE @rtotime datetime
DECLARE @rcontent varchar(50)
DECLARE @ruserName varchar(12)/*set @str=null*/
/*set nocount on*/
select @str=isnull(Id,''),@rmeetingId=isnull(meetingId,''),@rfromtime=isnull(fromtime,''),@rtotime=isnull(totime,''),
@rcontent=isnull(content,''),@ruserName=isnull(userName,'') from Revmeeting where meetingId=@meetingId
/*and(fromtime<=@totime and totime>=@fromtime )*/
if(@@rowcount>0)
begin
set @str='預定發生衝突,沖突記錄如下:\r\n會議編號:'+@rId+
'\r\n會議室編號:'+@rmeetingId+
'\r\n預定時間:'+cast(@rfromtime as varchar)+
'\r\n結束時間:'+cast(@rtotime as varchar)+
'\r\n會議名稱:'+@rcontent+
'\r\n預定人:'+@ruserName+'.'
select @str
return 1
end
else
insert into Revmeeting values(@meetingId,@fromtime,@totime,
@content,@userName,@node)