Main.java Source code

Introduction

Here is the source code for Main.java

Source

import java.sql.Connection;
import java.sql.DatabaseMetaData;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;

public class Main {

    public static void main(String[] args) throws Exception {
        Connection conn = getHSQLConnection();
        System.out.println("Got Connection.");
        Statement st = conn.createStatement();
        st.executeUpdate("create table survey (id int,name varchar, PRIMARY KEY (id) );");
        st.executeUpdate("insert into survey (id,name ) values (1,'nameValue')");

        ResultSet rs = null;
        DatabaseMetaData meta = conn.getMetaData();
        // The Oracle database stores its table names as Upper-Case,
        // if you pass a table name in lowercase characters, it will not work.
        // MySQL database does not care if table name is uppercase/lowercase.
        //
        rs = meta.getPrimaryKeys(null, null, "survey");

        java.util.List list = new java.util.ArrayList();
        while (rs.next()) {
            String columnName = rs.getString("COLUMN_NAME");
            System.out.println("getPrimaryKeys(): columnName=" + columnName);
        }

        st.close();
        conn.close();
    }

    private static Connection getHSQLConnection() throws Exception {
        Class.forName("org.hsqldb.jdbcDriver");
        System.out.println("Driver Loaded.");
        String url = "jdbc:hsqldb:data/tutorial";
        return DriverManager.getConnection(url, "sa", "");
    }

    public static Connection getMySqlConnection() throws Exception {
        String driver = "org.gjt.mm.mysql.Driver";
        String url = "jdbc:mysql://localhost/octopus";
        String username = "root";
        String password = "root";

        Class.forName(driver); // load MySQL driver
        Connection conn = DriverManager.getConnection(url, username, password);
        return conn;
    }

    public static Connection getOracleConnection() throws Exception {
        String driver = "oracle.jdbc.driver.OracleDriver";
        String url = "jdbc:oracle:thin:@localhost:1521:caspian";
        String username = "mp";
        String password = "mp2";

        Class.forName(driver); // load Oracle driver
        Connection conn = DriverManager.getConnection(url, username, password);
        return conn;
    }

}