Generic database connection code

Question

Hi,
I want to write a code from which I can get the connection for any database. For that i have a properties file in which connection details are declared.
----------------Proerpties file for oracle ---------------
driverClass=oracle.jdbc.driver.OracleDriver
url=jdbc:oracle:thin
user=admin
password=admin
server=oracleserver
port=1521
db=testdb
----------------Proerpties file for sql server ---------------
driverClass=com.microsoft.jdbc.sqlserver.SQLServerDriver
url=jdbc:microsoft:sqlserver
user=admin
password=admin
server=sqlserver
port=1433
db=testdb
----------------Java code ---------------
Properties info = // code to read the above properties file as properties
String driverClass = (String)info.remove("driverClass");   
String url = (String)info.remove("url");
Connection connection;
try
   //Get Driver
   Class.forName(driverClass).newInstance();
   //Get Connection
   connection = DriverManager.getConnection(url, info);
   return connection;
catch(....)
{}Now code does not work for both oracle and sqlserver. Whether the url needs to be modified? I know that if I delcare everything in url it would work, but I would not like to do that. Is it not possible to write a generic code which would work on any database? If yes how?
Can anyone help me?
Thanks

Answer 1

The thing is, that you have to handle oracle a little bit different in the
URL-Part:
String url;
String databasePort; // where your RDBMS is listening
String database; // the name of your database / instance
// ORACLE speciality
url = url + user + "/" + password + "@" + host + ":" + databasePort + ":" + database;
// EMPRESS speciality
url = url + "/SERVER=" + host + ";PORT=" + databasePort + ";DATABASE=" + database;
// Standard JDBC things (whatever standard means)
url = url + host + ":" + databasePort + "/" + database;
Next thing is, that you have to handle the getConnection different:
ORACLE: con = DriverManager.getConnection(url);
EMPRESS: con = DriverManager.getConnection(url,user,password);
Standard:
Properties p = new Properties();
p.put("user",user);
p.put("password",password);
con = DriverManager.getConnection(url,p);
Please be aware, that there are some products, not listening onto a port,
so you have to take this also into consideration.