We can query the results from the Microsoft search through SQL server. If we create a linked server with Search.CollatorDSO provider and try to query the SYSTEMINDEX to read the Microsoft search results. We get an error in SQL server 2008
Below is the query we tried to query the SYTEMINDEX. Here the linked server name is 'TESTSEARCH'
selectfilenamefromOPENQUERY(TESTSEARCH,'SELECT system. title FROM SYSTEMINDEX')
ERROR MESSAGE:
The Query fails with the following error.
OLE DB provider "Search.CollatorDSO" for linked server "TESTSEARCH" returned message "Command was not prepared.".
Msg 7399, Level 16, State 1, Line 1
The OLE DB provider "Search.CollatorDSO" for linked server "TESTSEARCH" reported an error. Command was not prepared.
Msg 7350, Level 16, State 2, Line 1
Cannot get the column information from OLE DB provider "Search.CollatorDSO" for linked server "TESTSEARCH".
We cannot always directly return the output from the Sytemindex as the resultset into the SQL server
RESOLUTION:
We can use the following C# code to return the String of top 5 item path from the SYSTEMINDEX data source to the SQL server. the Code establishes a connection to the seach.CollatorDSO and concatanates the output into a single strnig and resturn to the frontend.
using System.Data.OleDb;
using System.Data.SqlClient;
using Microsoft.SqlServer.Server;
public class cls_searchresults
{
[Microsoft.SqlServer.Server.SqlProcedure]
public static void fnc_searchresults()
{
SqlContext.Pipe.Send("Hello world! It's now " + System.DateTime.Now.ToString()+"\n");
using(OleDbConnection connection = new OleDbConnection("Provider=Search.CollatorDSO;Extended Properties='Application=Windows';"))
{
connection.Open();
OleDbCommand cmd = new OleDbCommand("SELECT Top 5 System.ItemPathDisplay FROM SYSTEMINDEX", connection);
OleDbDataReader reader = cmd.ExecuteReader();
string strOutput = "";
while (reader.Read())
{
strOutput += reader[0].ToString() + " ";
}
SqlContext.Pipe.Send(strOutput);
}
}
}
Then compile the code from the command prompt as a DLL using the following systax.
csc.exe /target:library result.cs
This create a DLL file with the name result.dll
Change the database property to trustworthy
ALTERDATABASEsampleSETTRUSTWORTHYON
We can use the CLR feature in SQL server to call this DLL. connect to the SQL server to appropriate database and create the assembly for the DLL file using the below syntax
CREATEASSEMBLY result_assembly from'E:\Cases\CLR\result.dll'WITHPERMISSION_SET=UNSAFE
Create a stored procedure with this assembly as below.
CREATEPROCEDURE sql_result
AS
EXTERNAL NAME result_assembly.cls_searchresults.fnc_searchresults()
Execute the stored procedure
EXEC sql_resul
We get the result in the string concatinated format as below
Hello world! It's now 5/22/2009 6:39:30 PM
c:\documents and settings c:\documents and settings\Administrator c:\documents and settings\All Users c:\documents and settings\ASPNET c:\documents and settings\sample
We can try to change the C# code further to obtain the output as a result set to the SQL server.
REFERENCES :
Querying the Index Programmatically: http://msdn.microsoft.com/en-us/library/bb266517(VS.85).aspx
Overview of the Windows Search SQL Syntax: http://msdn.microsoft.com/en-us/library/bb231255(VS.85).aspx
Using CLR Integration in SQL Server 2005 : http://msdn.microsoft.com/en-us/library/ms345136.aspx
SQL Server 2005: CLR Integration : http://blogs.msdn.com/sqlclr/
How to: Create and Run a CLR SQL Server User-Defined Function : http://msdn.microsoft.com/en-us/library/w2kae45k(VS.80).aspx
Introduction to SQL Server CLR Integration : http://msdn.microsoft.com/en-us/library/ms254498(VS.80).aspx
Memory Usage in SQL CLR : http://blogs.msdn.com/sqlclr/archive/2006/03/24/560154.aspx
SQL CLR Database Debugging : http://msdn.microsoft.com/en-us/library/ms165050.aspx
Sandeep Dasam
SQL Server Support Engineer
Reviewed by,
Nickson Dickson
Tech Lead – Microsoft SQL Server