Are there any examples on setting up a WebLogic 5.x with MSSQL 7.0?

It can be done in two steps:

1. Include the WebLogic jDriver for Microsoft SQL Server classes in the WebLogic classpath used to start WebLogic Server (specified with the weblogic.class.path property on the command line).
2. create a connection pool in weblogic.properties:

   weblogic.jdbc.connectionPool.SQLPool=
         url=jdbc:weblogic:mssqlserver4:myServer:myPort,
         driver=weblogic.jdbc.mssqlserver4.Driver,
         loginDelaySecs=1,
         initialCapacity=4,
         maxCapacity=10,
         capacityIncrement=2,
         allowShrinking=true,
         shrinkPeriodMins=15,
         refreshTestMinutes=10,
         testTable=dual,
         props=user=myUserName;password=secret;server=myServer;
   
   
   

You can find everything you need here:

• Installing WebLogic jDriver for Microsoft SQL Server
• Using WebLogic jDriver for Microsoft SQL Server