SQL 服务器从 XML 路径中删除尾随逗号

Question

我有以下代码，可以在我的给定 table 中提取我的专栏名称：

SELECT 
   column_name + ','
FROM   
   information_schema.columns 
WHERE  
   table_name = 'maintReq'
FOR XML PATH('')

我想将其放入我当前的查询中：

SET IDENTITY_INSERT maintReq ON; 
GO

INSERT INTO maintReq  
OUTPUT Inserted.ID 
VALUES ((SELECT ISNULL(MAX(id) + 1, 0) 
         FROM maintReq WITH(SERIALIZABLE, UPDLOCK)                   
        ),'MAYBE', 'true'); 

SET IDENTITY_INSERT maintReq OFF;

我自己尝试过以下操作：

SET IDENTITY_INSERT maintReq ON; 
GO
INSERT INTO maintReq (
                      SELECT 
                         column_name + ','
                      FROM   
                         information_schema.columns 
                      WHERE  
                         table_name = 'maintReq'
                      for 
                         xml path('')
                     )
   OUTPUT Inserted.ID 
      VALUES (
              (
               SELECT                                       
                  ISNULL(MAX(id)+1,0) 
               FROM     
                  maintReq WITH(SERIALIZABLE, UPDLOCK)                   
              ),'MAYBE', 'true'
             ); 
SET IDENTITY_INSERT maintReq OFF;

但是我得到的错误是：

Msg 156, Level 15, State 1, Line 4
Incorrect syntax near the keyword 'SELECT'.

Msg 102, Level 15, State 1, Line 8
Incorrect syntax near ')'.

Msg 102, Level 15, State 1, Line 16
Incorrect syntax near ','.

不确定该错误是由添加到 XML 路径的输出中的额外逗号引起的还是其他原因引起的？

我的完整存储过程如下所示：

DECLARE @SQLQuery VARCHAR(MAX);
    SET @SQLQuery = 'SET IDENTITY_INSERT ' + @val1 + ' ON 
                     INSERT INTO ' +
                        @val1 + ' 
                        OUTPUT Inserted.ID 
                     VALUES ' + 
                        '(
                            (
                                SELECT 
                                    ISNULL(MAX(id)+1,0) 
                                FROM 
                                    ' + @val1 + ' WITH(SERIALIZABLE, UPDLOCK)
                            ),''' + @val2 + ''', ''' + @val3 + '''
                        ) ' +
                     'SET IDENTITY_INSERT ' + @val1 + ' OFF;'
    EXEC [dbo].[_chkQ] @SQLQuery

上面的SP就是我目前得到的这个错误：

An explicit value for the identity column in table 'maintReq' can only be specified when a column list is used and IDENTITY_INSERT is ON.

感谢@Pரதீப்这是最终的工作查询代码：

SET @SQLQuery = 'SET IDENTITY_INSERT ' + @val1 + ' ON 
                     INSERT INTO ' + @val1 + '(' + 
                        Stuff(
                               (SELECT 
                                    ',' + quotename(column_name) 
                                FROM  
                                    information_schema.columns 
                                WHERE 
                                    table_name = '' + @val1 + '' 
                                FOR xml path('')
                               ), 1, 1, ''
                             ) + 
                     ')
                        OUTPUT Inserted.ID 
                     VALUES ' + 
                        '(
                            (
                                SELECT 
                                    ISNULL(MAX(id)+1,0) 
                                FROM 
                                    ' + @val1 + ' WITH(SERIALIZABLE, UPDLOCK)
                            ),''' + @val2 + ''', ''' + @val3 + '''
                        ) ' +
                     'SET IDENTITY_INSERT ' + @val1 + ' OFF;'

Answer 1

您需要使用动态 sql

DECLARE @col_list VARCHAR(8000)= ''

SET @col_list = Stuff((SELECT ',' + quotename(column_name) --"quotename" is to escape illegal characters
                       FROM   information_schema.columns
                       WHERE  table_name = 'maintReq'
                       FOR xml path('')), 1, 1, '')
SET IDENTITY_INSERT maintReq ON;

EXEC ('
INSERT INTO maintReq ('+@col_list+')
   OUTPUT Inserted.ID 
      VALUES (
              (SELECT                                       
                  ISNULL(MAX(id)+1,0) 
               FROM     
                  maintReq WITH(SERIALIZABLE, UPDLOCK)                   
              ),''MAYBE'', ''true''
             ); ')

SET IDENTITY_INSERT maintReq OFF;

SQL 服务器从 XML 路径中删除尾随逗号

SQL Server remove trailing comma from XML path

sql-server

identity-insert

insert-into

sql-server-2016