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

Java examples for JDBC:SQL Statement

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Description

Executing a SQL DELETE 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 . j  a va  2 s . c om
    try {
      conn = JDBCUtil.getConnection();
      deletePerson(conn, 101);
      JDBCUtil.commit(conn);
    } catch (SQLException e) {
      System.out.println(e.getMessage());
      JDBCUtil.rollback(conn);
    } finally {
      JDBCUtil.closeConnection(conn);
    }
  }

  public static void deletePerson(Connection conn, int personId)
      throws SQLException {
    String SQL = "delete from person " + "where person_id = " + personId;
    Statement stmt = null;
    try {
      stmt = conn.createStatement();
      int deletedCount = stmt.executeUpdate(SQL);
      System.out.println("Deleted " + deletedCount + " 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);

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

    Connection conn = DriverManager.getConnection(dbURL, userId, password);
    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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