Savepoints in a Transaction - Java JDBC

Java examples for JDBC:Transaction

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Description

Savepoints in a Transaction

Demo Code

import java.sql.Connection;
import java.sql.Driver;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Savepoint;
import java.sql.Statement;

public class Main {
  public static void main(String[] args) {
    Connection conn = null;/*w  w  w .j  a v  a2s.  co m*/
    try {
      conn = JDBCUtil.getConnection();
      conn.setAutoCommit(false);

      String SQL = "update person " + "set income = ? " + "where person_id = ?";

      PreparedStatement pstmt = conn.prepareStatement(SQL);
      pstmt.setDouble(1, 20000);
      pstmt.setInt(2, 101);
      pstmt.execute();

      Savepoint sp1 = conn.setSavepoint();

      pstmt.setDouble(1, 25000);
      pstmt.execute();

      Savepoint sp2 = conn.setSavepoint();

      conn.rollback(sp1);

      JDBCUtil.commit(conn);
    } catch (SQLException e) {
      System.out.println(e.getMessage());
      JDBCUtil.rollback(conn);
    } finally {
      JDBCUtil.closeConnection(conn);
    }
  }
}

class JDBCUtil {
  public static Connection getConnection() throws SQLException {
    // Register the Java DB embedded JDBC driver
    Driver derbyEmbeddedDriver = null;// new
                                      // org.apache.derby.jdbc.EmbeddedDriver();
    DriverManager.registerDriver(derbyEmbeddedDriver);

    // Construct the connection URL
    String dbURL = "jdbc:derby:beginningJavaDB;create=true;";
    String userId = "root";
    String password = "password";

    // Get a connection
    Connection conn = DriverManager.getConnection(dbURL, userId, password);

    // Set the auto-commit off
    conn.setAutoCommit(false);

    return conn;
  }

  public static void closeConnection(Connection conn) {
    try {
      if (conn != null) {
        conn.close();
      }
    } catch (SQLException e) {
      e.printStackTrace();
    }
  }

  public static void closeStatement(Statement stmt) {
    try {
      if (stmt != null) {
        stmt.close();
      }
    } catch (SQLException e) {
      e.printStackTrace();
    }
  }

  public static void closeResultSet(ResultSet rs) {
    try {
      if (rs != null) {
        rs.close();
      }
    } catch (SQLException e) {
      e.printStackTrace();
    }
  }

  public static void commit(Connection conn) {
    try {
      if (conn != null) {
        conn.commit();
      }
    } catch (SQLException e) {
      e.printStackTrace();
    }
  }

  public static void rollback(Connection conn) {
    try {
      if (conn != null) {
        conn.rollback();
      }
    } catch (SQLException e) {
      e.printStackTrace();
    }
  }

  public static void main(String[] args) {
    Connection conn = null;
    try {
      conn = getConnection();
      System.out.println("Connetced to the database.");
    } catch (SQLException e) {
      e.printStackTrace();
    } finally {
      closeConnection(conn);
    }
  }
}

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