Executing a SQL UPDATE Statement Using a Statement Object - Java JDBC

Java examples for JDBC:SQL Statement

  1. HOME
  2. Java
  3. JDBC
  4. SQL Statement

Description

Executing a SQL UPDATE Statement Using a Statement Object

Demo Code

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

public class Main {
  public static void main(String[] args) {
    Connection conn = null;//from w  w  w.  ja v  a2s  .  c om
    try {
      conn = JDBCUtil.getConnection();
      giveRaise(conn, 5.0);
      JDBCUtil.commit(conn);
      System.out.println("Updated person records successfully.");
    } catch (SQLException e) {
      System.out.println(e.getMessage());
      JDBCUtil.rollback(conn);
    } finally {
      JDBCUtil.closeConnection(conn);
    }
  }

  public static void giveRaise(Connection conn, double percentRaise)
      throws SQLException {
    String SQL = "update person " + "set income = income + income * "
        + (percentRaise / 100);
    Statement stmt = null;
    try {
      stmt = conn.createStatement();
      int updatedCount = stmt.executeUpdate(SQL);
      System.out.println("Gave raise to " + updatedCount + " person(s).");
    } finally {
      JDBCUtil.closeStatement(stmt);
    }
  }
}

class JDBCUtil {
  public static Connection getConnection() throws SQLException {
    Driver derbyEmbeddedDriver = null;// new
                                      // org.apache.derby.jdbc.EmbeddedDriver();
    DriverManager.registerDriver(derbyEmbeddedDriver);

    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);
    }
  }
}

Related Tutorials