How to insert Error_Message using EXECUTE sp_executesql - sql

Question

Using MS SQL Server I have the below code - it is being executed via a EXECUTE sp_executesql command:
Declare #Cmd nvarchar(max)
;with DistinctTables as
(
select distinct [DestTable], [SourceFile] from [tbl_IN_Ctrl_Dtl]
),
InsertCommands as
(
-- columns from Destination table
select *,
'BEGIN TRY insert into ' + [DestTable] + '(' +
STUFF((
SELECT ',' + [DestCol]
FROM [tbl_IN_Ctrl_Dtl] t1
where t1.DestTable = drt.DestTable
GROUP BY DestCol,ORDINAL_POSITION
ORDER BY ORDINAL_POSITION
FOR XML PATH(''), TYPE).value('.', 'VARCHAR(MAX)'),1,1,'')
+ ')' +
' select ' +
-- columns from source table
STUFF((
SELECT ',' + [SourceCol]
FROM [tbl_IN_Ctrl_Dtl] t1
where t1.DestTable = drt.DestTable
GROUP BY SourceCol,ORDINAL_POSITION
ORDER BY ORDINAL_POSITION
FOR XML PATH(''), TYPE).value('.', 'VARCHAR(MAX)'),1,1,'')
+ ' from ' + [SourceFile]
+ ';
update tbl_IN_Ctrl_Header set ErrMsg = ##ERROR where SourceFile_INSERT = 0 and SourceFile = ''' + [SourceFile]+ ''''
+';
update tbl_IN_Ctrl_Header set SourceFile_INSERT = 1 where SourceFile_INSERT = 0 and SourceFile = ''' + [SourceFile]+ ''''
+'; END TRY BEGIN CATCH'
as InsertCommand
from DistinctTables drt
)
select #cmd =
STUFF((
SELECT ';' + char(10) + [InsertCommand]
FROM InsertCommands
FOR XML PATH(''), TYPE).value('.', 'VARCHAR(MAX)'),1,1,'')
+';' from InsertCommands ic
--print #cmd
EXECUTE sp_executesql #cmd
I can retrieve the error number using line:
update tbl_IN_Ctrl_Header set ErrMsg = ##ERROR where SourceFile_INSERT = 0 and SourceFile = ''' + [SourceFile]+ ''''
However, how do I retrieve the actual text error message? If I use ERROR_MESSAGE I just get Null. How do I modify the above to update 'ErrMsg' to the actual text error message? I've put a BEGIN TRY at the beginning of the Insert and END TRY at the end of the UPDATE but I now receive the error Incorrect syntax near ';'.