Load and save data to Derby database : Derby « Database SQL JDBC « Java

1. Java
2. Database SQL JDBC
3. Derby

Load and save data to Derby database

 
import java.io.File;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;

public class MainClass {
  public static void createDatabase() {
    String data = "jdbc:derby:presidents;create=true";
    try {
      Class.forName("org.apache.derby.jdbc.EmbeddedDriver");
      Connection conn = DriverManager.getConnection(data);
      Statement st = conn.createStatement();
      int result = st.executeUpdate("CREATE TABLE contacts (dex INTEGER NOT NULL PRIMARY KEY "
          + "GENERATED ALWAYS AS identity (START WITH 1, INCREMENT BY 1), "
          + "name VARCHAR(40), address1 VARCHAR(40), address2 VARCHAR(40))");
 
      result = st.executeUpdate("INSERT INTO contacts (name, address1, address2"
          + ") VALUES('J','Center', 1 , 'GA')");
      st.close();
    } catch (Exception e) {
      System.out.println("Error - " + e.toString());
    }
  }

  public static void readDatabase() {
    String data = "jdbc:derby:presidents";
    try {
      Class.forName("org.apache.derby.jdbc.EmbeddedDriver");
      Connection conn = DriverManager.getConnection(data, "", "");
      Statement st = conn.createStatement();
      ResultSet rec = st.executeQuery("SELECT * FROM contacts ORDER BY name");
      while (rec.next()) {
        System.out.println(rec.getString("name") + "\n" + rec.getString("address1") + "\n"
            + rec.getString("address2") + "\n" + rec.getString("phone") + "\n"
            + rec.getString("email") + "\n");
      }
      st.close();
    } catch (Exception e) {
      System.out.println("Error - " + e.toString());
    }
  }

  public static void main(String[] arguments) {
    String home, system;    
    home = System.getProperty("user.home", ".");
    system = home + File.separatorChar + ".database";
    System.setProperty("derby.system.home", system);
    createDatabase();
    readDatabase();
  }
}

            

 

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