TSQL - 選擇計數（*）..到Varchar變量

Question

比方說，我有10個表，我需要寫一個簡單的LOG條目，說明每個表有多少記錄。

喜歡的東西

Declare @msg Varchar(MAX) 
Set @msg = 'Process Succeeded; Table1 has xx record, Table2 has zz records, Table3 has ww records ...' 

Insert INTO LOG (msg) VALUES (@msg) 

Answer 1

或者把它捲成：

declare @Summary as VarChar(256) 
select @Summary = 
    'Foo: ' + Cast((select Count(42) from Foo) as VarChar(10)) + 
    ', Bar: ' + Cast((select Count(42) from Bar) as VarChar(10)) 
select @Summary 

Answer 2

由於SQL Server當前沒有這樣的事情string.Format任何支持，你要做的：

DECLARE @msg VARCHAR(MAX) 

DECLARE @Table1Count INT 
SELECT @Table1Count = COUNT(*) FROM dbo.Table1 

DECLARE @Table2Count INT 
SELECT @Table2Count = COUNT(*) FROM dbo.Table2 

..... and so forth for each table you want to consider 

SET @msg = 'Process Succeeded; ' + 
    'Table1 has ' + CAST(@Table1Count AS VARCHAR(10)) + ' rows, ' + 
    'Table2 has ' + CAST(@Table2Count AS VARCHAR(10)) + ' rows...' + ........ 

Insert INTO LOG (msg) VALUES (@msg) 

眼下，在SQL Server中，這是一個痛苦 - 這就是爲什麼將這些計數返回到前端應用程序並在那裏進行格式化和日誌寫入可能更容易。

SQL Server 2012 will have a FORMAT function（姍姍來遲！）

Answer 3

嘗試

Declare @msg Varchar(2000) 
,@table1count varchar (100) 
,@table2count varchar (100) 

Select @table1count= cast(count(*) as varchar (100)) from table1 

Select @table2count= cast(count(*) as varchar (100)) from table2 

Set @msg = 'Process Succeeded; Table1 has '+@table1count +' records, Table2 has '+@table2count+' records, ...' 

Insert INTO LOG (msg) VALUES (@msg) 

當然，我只給你的前兩個表，就可以使用同德爲techinique休息。