Question

I need to access DB2 database in plain standalone Java project.

I cannot use datasource from container right? Do I need to write JDBC connection?

Answer 1

You need to have necessary db2 JDBC jars in your program’s compile time, runtime classpath.
If you have native DB2 client installed on target machines, you may use JDBC ODBC Bridge. However, best to stick with pure Java- type4 drivers. (db2jcc.jar, db2jcc_license*.jar etc)

Once the drivers are in classpath, you may use usual JDBC code to start with. Such as:

import java.sql.*;
import java.lang.*;
import java.io.*;
import Com.ibm.db2.jcc.*;  //Type4 library
public class DB2Sample{
  static
  {
    try 
    {       

      Class.forName("com.ibm.db2.jcc.DB2Driver");
    } 
    catch (ClassNotFoundException e)
    {
       System.err.println("Could not load DB2 driver \n");
       System.err.println(e.getMessage());
       System.exit(1);
    }

public static void main(String args[]) 
  {

    /* Type 4 driver url */
    String url = "jdbc:db2j:net://machine-name:port-number/TGSAMPLE";
         Connection conn = DriverManager.getConnection(url,"userid", "psswrd");
...
  }

and so on.

Look at IBM documentation here for better examples and details