declare @histabname varchar(50)
declare @device_id varchar(20)
declare @longitude float
declare @latitude float
declare @speed int
declare @direction varchar(50)
declare @newlicheng int
declare @acc bit
declare @placeinfo varchar(400)
declare @poiInfo varchar(400)
declare @Status varchar(20)
set @histabname='HISTRACEINFO1'
set @device_id='18949071017'
set @longitude=114.5526
set @latitude=30.5565
set @speed=56
set @direction=''
set @newlicheng=''
set @acc=1
set @placeinfo='123456789'
set @poiInfo=''
set @Status=''
declare @sqlstr varchar(400)
set @sqlstr='insert into ' + @histabname + '(phonenum,gpsx,gpsy,speed,direction,logintime,licheng,acc,RegionInfo,PlaceInfo,Status) values(' + @device_id + ',' + @longitude + ',' + @latitude + ','+ @speed + ',' + @direction + ',getdate(),' + @newlicheng + ',' + @acc + ',' + @placeinfo + ',' + @poiInfo + ',' + @Status + ')'
exec @sqlstr
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
set @sqlstr='insert into ' + @histabname + '(phonenum,gpsx,gpsy,speed,direction,logintime,licheng,acc,RegionInfo,PlaceInfo,Status) values(''' +
@device_id + ''',' + cast(@longitude as varchar) + ',' + cast(@latitude as varchar)+ ','+ cast(@speed as varchar)+ ',''' + @direction + ''',''' + convert(varchar(19),getdate(),120) + ''','
+ cast(@newlicheng as varchar) + ',' + cast(@acc as varchar) + ',''' + @placeinfo + ''',''' + @poiInfo + ''',''' + @Status + '''')'
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