How to get the columns from respective tables in a database dynamically in SQL?

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I want to get the columns from respective tables in a database dynamically in SQL. i am able to fetch columns without square braces embarrassed. But I need to do so since there is are columns with hyphen for few tables .

What I have tried:

Core Code is as below:

select @SourceColumnList = @SourceColumnList + ',' + case when DATA_TYPE = 'xml' then 'convert(varchar(max),'+column_name+')' else column_name end 
from information_schema.columns 
where table_name = @TableName and DATA_TYPE not in ('timestamp') 

select @DestinationColumnList=  @DestinationColumnList+ ',' + column_name 
from information_schema.columns 
where table_name = @TableName and DATA_TYPE not in ('timestamp') 


set @SourceColumnList= RIGHT(@SourceColumnList,Len(@SourceColumnList)-1) 
set @DestinationColumnList= RIGHT(@DestinationColumnList,Len(@DestinationColumnList)-1)

select

set @SourceColumnList

select

set @DestinationColumnList

Posted 11-Jun-18 17:55pm

ranio

Updated 12-Jun-18 2:28am

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Maciej Los 12-Jun-18 1:11am

What?

ranio 12-Jun-18 3:08am

I want to fetch the columns from table as in below format

I mean say

insert into test([a].[b],[c])
select [a],[b],[c] from abc

all columns must be with in square braces as mentioned above.
i need to set so in the dynamic script shown below:

select @SourceColumnList = @SourceColumnList + ',' + case when DATA_TYPE = 'xml' then 'convert(varchar(max),'+column_name+')' else column_name end
from information_schema.columns
where table_name = @TableName and DATA_TYPE not in ('timestamp')

select @DestinationColumnList= @DestinationColumnList+ ',' + column_name
from information_schema.columns
where table_name = @TableName and DATA_TYPE not in ('timestamp')

set @SourceColumnList= RIGHT(@SourceColumnList,Len(@SourceColumnList)-1)
set @DestinationColumnList= RIGHT(@DestinationColumnList,Len(@DestinationColumnList)-1)

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Eric Lynch · Answer 1 · 2018-06-11T23:51:00

Not sure I understand your question. Are you looking for a way to get the comma separated list or a way to add the brackets?

Does this perhaps solve your problem?

DECLARE @TableName varchar(max) = 'Invoices'
DECLARE @ColumnList varchar(max)
SELECT @ColumnList = COALESCE(@ColumnList + ',', '') + '[' + column_name + ']' from information_schema.columns WHERE table_name = @TableName
SELECT @ColumnList

RmcbainTheThird · Answer 2 · 2018-06-12T02:30:00

This is what your sql query should look like

INSERT INTO [SOME_TABLE]
           ([Position]
           ,[DisplayText]
           ,[DisplayURL]
           ,[ToolTip])
     VALUES (SELECT Position, DisplayText, Display, URLToolTip
			 FROM  [SOME_OTHER_TABLE]
			 WHERE [Position] = @parent_id)

The value for the where clause should be a parameter in your c# code.

SqlParameter param = new SqlParameter
            {
                ParameterName = "@parent_id",
                DbType = DbType.Int32,
                Value = parentID
            };

and added to your SqlCommand object like this

cmd.Parameters.Add(param);

How to get the columns from respective tables in a database dynamically in SQL?

2 solutions

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