如何在SQL Server中使用动态查询执行sql

我有动态SQL的问题。当我使用Print (@sql)和manualy复制粘贴&，它完美的作品，但使用exec (@sql)或exec sp_executesql @sql如何在SQL Server中使用动态查询执行sql

在这个例子中我使用的系统表sys.types

你有什么想法我做错了吗？

CREATE TABLE [dbo].pomocnicza 
(okres VARCHAR(5) PRIMARY KEY 
, idWiersza INT 
, cnt INT 
) 

INSERT INTO [dbo].pomocnicza(okres, idWiersza, cnt) 
SELECT okres, idWiersza, cnt FROM(SELECT '07_03'okres, 2 idWiersza, 1 cnt 
UNION 
SELECT '07_04', 3, 2 
UNION 
SELECT '07_07', 6, 3 
UNION 
SELECT '07_10', 9, 4 
UNION 
SELECT '07_14', 13, 5) t

和动态SQL：

DECLARE @sql VARCHAR(max) 
, @sqlSub VARCHAR(max) 
, @cnt INT = 0 
, @cntSub INT = 2 
, @cnt_total INT = 0 
, @okres VARCHAR(5) 
, @idWiersza INT; 

SELECT @cnt_total = COUNT(1) FROM [dbo].pomocnicza 

WHILE @cnt <= @cnt_total 
BEGIN 
    SELECT @okres = okres, @idWiersza = idWiersza FROM [dbo].pomocnicza WHERE cnt = @cnt 
    SET @sql = 'select distinct name, schema_id, ''' + @okres 
       + ''' as okres, getdate() as czas 
       , (case when scale<>0 then 100 else 0 end) scale 
       , (case when precision>=4 
       ' 
    WHILE @cntSub <= @idWiersza 
    BEGIN 
     SET @sqlSub = @sqlSub + ' or isnull(lead(max_length,' + CAST(@cntSub AS VARCHAR) + ') over (partition by scale,precision order by precision),0)=0' 
     SET @cntSub = @cntSub + 1; 
    END 
     SET @sql = @sql + @sqlSub + ' then 0 else 1 end) all_period_available FROM sys.types' 

    if @cnt+1 <= @cnt_total 
    begin 
     SET @sql = @sql + ' 
     union all 
     '; 
    end 


    SET @cnt = @cnt + 1; 
    SET @sqlSub = '' 
    SET @cntSub = 2 

print (@sql) 
exec (@sql)  
END;

根据什么我执行我有不同的错误

1）只有exec (@sql)

消息：

Msg 102, Level 15, State 1, Line 5 
Incorrect syntax near 'all'. 
Msg 102, Level 15, State 1, Line 5 
Incorrect syntax near 'all'. 
Msg 102, Level 15, State 1, Line 5 
Incorrect syntax near 'all'. 
Msg 102, Level 15, State 1, Line 5 
Incorrect syntax near 'all'. 

(34 row(s) affected)

个

结果：

select distinct name, schema_id, '07_03' as okres, getdate() as czas 
       , (case when scale<>0 then 100 else 0 end) scale 
       , (case when precision>=4 
       or isnull(lead(max_length,2) over (partition by scale,precision order by precision),0)=0 then 0 else 1 end) all_period_available FROM sys.types 
     union all 

Msg 102, Level 15, State 1, Line 5 
Incorrect syntax near 'all'. 
select distinct name, schema_id, '07_04' as okres, getdate() as czas 
       , (case when scale<>0 then 100 else 0 end) scale 
       , (case when precision>=4 
       or isnull(lead(max_length,2) over (partition by scale,precision order by precision),0)=0 or isnull(lead(max_length,3) over (partition by scale,precision order by precision),0)=0 then 0 else 1 end) all_period_available FROM sys.types 
     union all 

Msg 102, Level 15, State 1, Line 5 
Incorrect syntax near 'all'. 
select distinct name, schema_id, '07_07' as okres, getdate() as czas 
       , (case when scale<>0 then 100 else 0 end) scale 
       , (case when precision>=4 
       or isnull(lead(max_length,2) over (partition by scale,precision order by precision),0)=0 or isnull(lead(max_length,3) over (partition by scale,precision order by precision),0)=0 or isnull(lead(max_length,4) over (partition by scale,precision order by precision),0)=0 or isnull(lead(max_length,5) over (partition by scale,precision order by precision),0)=0 or isnull(lead(max_length,6) over (partition by scale,precision order by precision),0)=0 then 0 else 1 end) all_period_available FROM sys.types 
     union all 

Msg 102, Level 15, State 1, Line 5 
Incorrect syntax near 'all'. 
select distinct name, schema_id, '07_10' as okres, getdate() as czas 
       , (case when scale<>0 then 100 else 0 end) scale 
       , (case when precision>=4 
       or isnull(lead(max_length,2) over (partition by scale,precision order by precision),0)=0 or isnull(lead(max_length,3) over (partition by scale,precision order by precision),0)=0 or isnull(lead(max_length,4) over (partition by scale,precision order by precision),0)=0 or isnull(lead(max_length,5) over (partition by scale,precision order by precision),0)=0 or isnull(lead(max_length,6) over (partition by scale,precision order by precision),0)=0 or isnull(lead(max_length,7) over (partition by scale,precision order by precision),0)=0 or isnull(lead(max_length,8) over (partition by scale,precision order by precision),0)=0 or isnull(lead(max_length,9) over (partition by scale,precision order by precision),0)=0 then 0 else 1 end) all_period_available FROM sys.types 
     union all 

Msg 102, Level 15, State 1, Line 5 
Incorrect syntax near 'all'. 
select distinct name, schema_id, '07_14' as okres, getdate() as czas 
       , (case when scale<>0 then 100 else 0 end) scale 
       , (case when precision>=4 
       or isnull(lead(max_length,2) over (partition by scale,precision order by precision),0)=0 or isnull(lead(max_length,3) over (partition by scale,precision order by precision),0)=0 or isnull(lead(max_length,4) over (partition by scale,precision order by precision),0)=0 or isnull(lead(max_length,5) over (partition by scale,precision order by precision),0)=0 or isnull(lead(max_length,6) over (partition by scale,precision order by precision),0)=0 or isnull(lead(max_length,7) over (partition by scale,precision order by precision),0)=0 or isnull(lead(max_length,8) over (partition by scale,precision order by precision),0)=0 or isnull(lead(max_length,9) over (partition by scale,precision order by precision),0)=0 or isnull(lead(max_length,10) over (partition by scale,precision order by precision),0)=0 or isnull(lead(max_length,11) over (partition by scale,precision order by precision),0)=0 or isnull(lead(max_length,12) over (partition by scale,precision order by precision),0)=0 or isnull(lead(max_length,13) over (partition by scale,precision order by precision),0)=0 then 0 else 1 end) all_period_available FROM sys.types 

(34 row(s) affected)

结果：：34行只从最后工会

3）只从最后工会

2）

print (@sql) exec (@sql)

消息34级的行 只有print (@sql) 我有完美的工作SQL：

select distinct name, schema_id, '07_03' as okres, getdate() as czas 
       , (case when scale<>0 then 100 else 0 end) scale 
       , (case when precision>=4 
       or isnull(lead(max_length,2) over (partition by scale,precision order by precision),0)=0 then 0 else 1 end) all_period_available FROM sys.types 
     union all 

select distinct name, schema_id, '07_04' as okres, getdate() as czas 
       , (case when scale<>0 then 100 else 0 end) scale 
       , (case when precision>=4 
       or isnull(lead(max_length,2) over (partition by scale,precision order by precision),0)=0 or isnull(lead(max_length,3) over (partition by scale,precision order by precision),0)=0 then 0 else 1 end) all_period_available FROM sys.types 
     union all 

select distinct name, schema_id, '07_07' as okres, getdate() as czas 
       , (case when scale<>0 then 100 else 0 end) scale 
       , (case when precision>=4 
       or isnull(lead(max_length,2) over (partition by scale,precision order by precision),0)=0 or isnull(lead(max_length,3) over (partition by scale,precision order by precision),0)=0 or isnull(lead(max_length,4) over (partition by scale,precision order by precision),0)=0 or isnull(lead(max_length,5) over (partition by scale,precision order by precision),0)=0 or isnull(lead(max_length,6) over (partition by scale,precision order by precision),0)=0 then 0 else 1 end) all_period_available FROM sys.types 
     union all 

select distinct name, schema_id, '07_10' as okres, getdate() as czas 
       , (case when scale<>0 then 100 else 0 end) scale 
       , (case when precision>=4 
       or isnull(lead(max_length,2) over (partition by scale,precision order by precision),0)=0 or isnull(lead(max_length,3) over (partition by scale,precision order by precision),0)=0 or isnull(lead(max_length,4) over (partition by scale,precision order by precision),0)=0 or isnull(lead(max_length,5) over (partition by scale,precision order by precision),0)=0 or isnull(lead(max_length,6) over (partition by scale,precision order by precision),0)=0 or isnull(lead(max_length,7) over (partition by scale,precision order by precision),0)=0 or isnull(lead(max_length,8) over (partition by scale,precision order by precision),0)=0 or isnull(lead(max_length,9) over (partition by scale,precision order by precision),0)=0 then 0 else 1 end) all_period_available FROM sys.types 
     union all 

select distinct name, schema_id, '07_14' as okres, getdate() as czas 
       , (case when scale<>0 then 100 else 0 end) scale 
       , (case when precision>=4 
       or isnull(lead(max_length,2) over (partition by scale,precision order by precision),0)=0 or isnull(lead(max_length,3) over (partition by scale,precision order by precision),0)=0 or isnull(lead(max_length,4) over (partition by scale,precision order by precision),0)=0 or isnull(lead(max_length,5) over (partition by scale,precision order by precision),0)=0 or isnull(lead(max_length,6) over (partition by scale,precision order by precision),0)=0 or isnull(lead(max_length,7) over (partition by scale,precision order by precision),0)=0 or isnull(lead(max_length,8) over (partition by scale,precision order by precision),0)=0 or isnull(lead(max_length,9) over (partition by scale,precision order by precision),0)=0 or isnull(lead(max_length,10) over (partition by scale,precision order by precision),0)=0 or isnull(lead(max_length,11) over (partition by scale,precision order by precision),0)=0 or isnull(lead(max_length,12) over (partition by scale,precision order by precision),0)=0 or isnull(lead(max_length,13) over (partition by scale,precision order by precision),0)=0 then 0 else 1 end) all_period_available FROM sys.types

来源

2016-08-12 Peter_K

有什么错误讯息？打印@sql时获得的文字是什么？ –

“不起作用”是什么意思？抛出一个错误？，错误的结果？，什么？ – Lamak

那个内在'while'看起来不太好... –

你需要移动EXEC (@sql)外While循环，即 - 你的最后三行..

print (@sql) 
exec (@sql)  
END;

..need更改为。。

END; 
print (@sql) 
exec (@sql)

而且，你的第一个@sql =声明必须@sql = @sql +像你在其他地方。由于您的陈述中有UNION，因此您只需要执行@sql一次。为了实现这个功能，您需要在脚本的开始部分输入set @sql = ''。

这一修正的整个脚本将看起来像这样：

DECLARE @sql VARCHAR(max) = '' 
, @sqlSub VARCHAR(max) = '' 
, @cnt INT = 1 
, @cntSub INT = 2 
, @cnt_total INT = 0 
, @okres VARCHAR(5) 
, @idWiersza INT; 

SELECT @cnt_total = COUNT(1) FROM [dbo].pomocnicza 

WHILE @cnt <= @cnt_total 
BEGIN 
    SELECT @okres = okres, @idWiersza = idWiersza FROM [dbo].pomocnicza WHERE cnt = @cnt 
    SET @sql = @sql + 'select distinct name, schema_id, ''' + @okres 
       + ''' as okres, getdate() as czas 
       , (case when scale<>0 then 100 else 0 end) scale 
       , (case when precision>=4 
       ' 
    WHILE @cntSub <= @idWiersza 
    BEGIN 
     SET @sqlSub = @sqlSub + ' or isnull(lead(max_length,' + CAST(@cntSub AS VARCHAR) + ') over (partition by scale,precision order by precision),0)=0' 
     SET @cntSub = @cntSub + 1; 
    END 
     SET @sql = @sql + @sqlSub + ' then 0 else 1 end) all_period_available FROM sys.types' 

    if @cnt+1 <= @cnt_total 
    begin 
     SET @sql = @sql + ' 
     union all 
     '; 
    end 


    SET @cnt = @cnt + 1; 
    SET @sqlSub = '' 
    SET @cntSub = 2 

END; 
print (@sql) 
exec (@sql)

来源

2016-08-17 12:12:48

当我用你的更正执行代码时，我只看到空的消息部分和“查询成功执行”。你有同样的结果吗？ –

我只是略微调整了脚本。 “@sqlsub”需要由“@sqlsub”=“'初始化”，就像“@sql”一样。另外“@cnt”应该从1开始，因为“cnt”从不为0. –

现在它完美地工作。非常感谢你：） –

如何在SQL Server中使用动态查询执行sql

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