BSP Application connection to SQL Express DB to execute SQL Queries

Hi There everyone,
I am not sure if I am posting this discussion in the correct section, but please try and help me out.
I have been tasked to write a BSP Application in the ABAP Workbench. The purpose of this application is to enable our Weighbridge operators to execute pre-defined SQL Queries by selecting certain criteria from the Application. The application is based on an HTML frontend which includes the Web Form (Input Fields, Submit buttons). We have 6 Weighbridges, each has its own HTML page in this application.
What I need to achieve is the following;
I need to know how I must setup the connection between the BSP Application and the SQL Express DB. Each Weighbridge has its own dedicated SQL Express instance + DB. These SQL Instances are not on the same host as where the BSP Application is located, I think the correct term is "External SQL Instances". Everything is on the same domain though.
What code would I need to add to the "OnInitialize" section in the BSP Application, to be able to establish the connection to the SQL Express database using Windows Authentication?
And what code would I need to attach to my submit buttons in the "OnInputProcessing" in the BSP Application, to execute a SQL Query to that DB and display the results in .CSV format back to the user?
I have attached 2 screenshots of what the BSP Application interface looks like. (This is what the user sees)
I am very new to creating BSP's, and I have never had to link to SQL from HTML / PHP before, so I basically have no knowledge of this.
Any help will be greatly appreciated.

Sorry for the late reply.
Yes, database is always available and online, not involved in Log Shipping or other things.
At the time of the connection failure I can find the following in the log of the application:
ProcessID:2452 ,ThreadID:4768 : NI-I - 24/08/2012-15:12:20 - \PCV/src/ni/src/pcvnireceive.cpp - 4741 - Thread 4768 - Receive Thread Started for Remote Node 043SBTMS10DRSP: In Thread index 1:
ProcessID:2452 ,ThreadID:4768 : NI-I - 24/08/2012-15:12:40 - \PCV/src/ni/src/pcvnireceive.cpp - 4968 - Thread 4768 - Receive Thread Ended for Remote Node 043SBTMS10DRSP: In Thread index 1:
ProcessID:2452 ,ThreadID:4768 : NI-I - 24/08/2012-15:12:40 - \PCV/src/ni/src/pcvnireceive.cpp - 115 - Thread 4768 - Merge Memory Usage: KB Allocated = 2186, KB in use = 889
ProcessID:2452 ,ThreadID:1408 : NiJ - E - 25/08/2012-19:35:29 - \PCV/src/ni/src/pcvnijournal.cpp - 2842 - PcvNiJournal::isRetrievePending() - DB Exception.Error: TCP Provider: The specified network name is no longer available.
Communication link failureQuery timeout expired - State:08S01,Native:64,Origin:[Microsoft][SQL Server Native Client 10.0] State:08S01,Native:64,Origin:Microsoft][SQL Server Native Client 10.0]
State:S1T00,Native:0,Origin:[Microsoft][SQL Server Native Client 10.0]

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