Setup automated login to Oracle database

Hi,
I am facing a problem while connecting to the Oracle database automatically.
I want to setup an SQL query on the database which is scheduled to run every midnight. The SQL query then populates an Excel spreadsheet with the results. I was able to schedule the SQL qeury, however, the problem is that it requests the user to type in the password every time it runs. I want to store the username and password in the connection string/driver settings to avoid uder interaction.
The following are ths current settings :
1. In Microsoft ODBC setup for Oracle settings,
DSN = DDTS
Description = (DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=TCP)(HOST=bee1.pcs.mot.com)(PORT=1521)))(CONNECT_DATA=(SERVICE_NAME=WSDTOOL1)))
Username = myUserName
Server = DDTS
2. In MS Excel, I created the Data Source and set the driver to MS ODBC for Oracle.
I tried to save the UID=xxx and PWD=xxx in the (a) Connection String for the ODBC Setup (b) in the tnsnames.org, but none of the options work. It still needs the user to enter the password everytime it executes.
Can someone help ?
Thanks !

Hi Justin,
Thanks for your reply.
There's no particular reason as to why I chose MS ODBC driver rather than selecting the Oracle ODBC driver.
As you had suggested, I tried to use the setup the data source using the Oracle ODBC driver, but I am getting a connection error : 'ORA-12154: TNS : Could not resolve service name Driver's SQLSetConnectAttr failed'. I guess its something to do with my settings, but I am not sure what's wrong. Here are the settings for the data source with Oracle ODBC driver :
Data Source Name : myDDTS
Description : (DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=TCP)(HOST=bee1.xx.xx.com)(PORT=1521)))(CONNECT_DATA=(SERVICE_NAME=WSDTOOL1)))
Data Source ( Service Name) : WSDTOOL1
Data Source ( UserID) : myUserID
Also, could you let me know which registry entries need to be modified to save the userID and password ? ( I am a newbie with Oracle).
Regarding your question, the ODBC connect string I was using with MS ODBC driver was : (DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=TCP)(HOST=bee1.xx.xx.com)(PORT=1521)))(CONNECT_DATA=(SERVICE_NAME=WSDTOOL1))). The connection was successful and the query worked fine, the only problem I was facing ( and looking for a solution ) was that a dialog box used to pop up asking for the password every time the SQL query is executed which I want to avoid. I want to save the password so that the query runs without any user interaction.
Thanks for your help ! Waiting for your reply....

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