how to fetch the data in data list using different databases and in a text box we have to write query

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Actually in my project i have to fetch the database from different servers in a Datalist.But i have to write the query in a text box...In a Tree view i have multiple databases based on the which database i click that database will appear in datalist. please help me....

Posted 28-Jul-11 8:21am

45678910

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Abhinav S · Answer 1 · 2011-07-28T08:31:00

Solution 1

If you need to do a Union for all the tables in the different servers, try

SQL

select column1 from [server1].[table1] 
UNION
select column1 from [server2].[table2]

Write the query in the text box and then execute this query in a Data Reader.

Posted 28-Jul-11 8:31am

Abhinav S

OriginalGriff · Answer 2 · 2011-07-28T08:36:00

Solution 2

You do realize just how dangerous that is, don't you?
It's one thing to risk an SQL Injection Attack by concatenating your strings, completely another to hand complete copntrol of the SQL query to the user. What happens if they enter a query like:

SQL

DROP TABLE Customers

Posted 28-Jul-11 8:36am

OriginalGriff

Comments

45678910 28-Jul-11 22:34pm

yes i know that i already implemented that...if any one write query like that it gives security alert...I gave access privileages...so please help me for above problem

OriginalGriff 29-Jul-11 3:39am

And that applies to UPDATE and INSERT statements, too?