连接数据库增加删除查询修改 (swing中)

最新推荐文章于 2022-04-06 23:29:07 发布

zings

最新推荐文章于 2022-04-06 23:29:07 发布

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分类专栏： swing 文章标签：数据库 swing exception string sql insert

本文链接：https://blog.youkuaiyun.com/zings/article/details/2780038

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本文提供了一个使用Java进行数据库操作的示例，包括插入记录、查询所有记录、查询特定条件的记录以及批量插入记录的方法。通过具体的代码展示了如何利用Statement和PreparedStatement来实现这些功能。

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1. 插入
//插入语句连接数据库(按钮)
public static Connection fetchconnection()
{
  try{
         Class.forName("oracle.jdbc.driver.OracleDriver");
      String url ="jdbc:oracle:thin:@192.168.119.108:1521:orclcn";
   String user = "zenggan";
   String pwd = "zeng";
      return DriverManager.getConnection(url, user, pwd);
  }
  catch(Exception e)
  {
   e.printStackTrace();
   return null;
  }
}

private void addCourseButtonActionPerformed(ActionEvent evt) throws SQLException {
  /**
   * 插入语句
   */
  //---------------------------------
  Statement statement = null;
  Connection connection =null;
  //ResultSet resultSet = null;
  try{
   connection = fetchconnection();
   //System.out.println(connection);
   statement = connection.createStatement();

   String sql = "insert into subject(sub_id,sub_name,credit) values('"+this.sub_idTextField.getText()+"','"+this.sub_nameTextField.getText()+"','"+this.creditTextField.getText()+"')";
      statement.executeUpdate(sql);

  }
  catch(Exception e)
  {
     e.printStackTrace();
  }
  finally{
   //resultSet.close();
   statement.close();
   connection.close();
  }

2. 查询
Statement statement = null;
  Connection connection =null;
  ResultSet resultSet = null;
  try{
   connection = fetchconnection();
   //System.out.println(connection);
   statement = connection.createStatement();

  /* String sql = "insert into class values(120,'zeng')";
   int i = statement.executeUpdate(sql);
    System.out.println(i); */

   String sql = "select * from class";
   resultSet = statement.executeQuery(sql);
   while(resultSet.next())
   {
     System.out.println("id: "+resultSet.getLong("id")+"| name: "+resultSet.getString("psd"));
   }
  }
  catch(Exception e)
  {
     e.printStackTrace();
  }
  finally{
   resultSet.close();
   statement.close();
   connection.close();
  }

}
public static Connection fetchconnection()
{
  try{
         Class.forName("oracle.jdbc.driver.OracleDriver");
      String url ="jdbc:oracle:thin:@192.168.119.108:1521:orclcn";
   String user = "zenggan";
   String pwd = "zeng";
      return DriverManager.getConnection(url, user, pwd);
  }
  catch(Exception e)
  {
   e.printStackTrace();
   return null;
  }
}

3. 查询ID>5的数据库里面的信息
public static void main(String[] args) throws Exception {

  PreparedStatement statement = null;
  Connection connection =null;
  ResultSet resultSet = null;
  try{
   connection = fetchconnection();

   String sql = "select * from class where id > ?";
   statement = connection.prepareStatement(sql);
   statement.setLong(1, 5);//此处是最大区别
   resultSet = statement.executeQuery();
   while(resultSet.next())
   {
     System.out.println("id: "+resultSet.getLong("id")+"| name: "+resultSet.getString("psd"));
   }
  }
  catch(Exception e)
  {
     e.printStackTrace();
  }
  finally{
   resultSet.close();
   statement.close();
   connection.close();
  }

4. 插入多条语句时代码
public static void main(String[] args) throws Exception {

  Statement statement = null;
  Connection connection =null;
  ResultSet resultSet = null;
  try{
   connection = fetchconnection();
   connection.setAutoCommit(false);    //设置为手动提交
   String sql = "insert into class values(119,'火警')";
   statement = connection.createStatement();
   int updateline = statement.executeUpdate(sql);
   sql = "insert into class values(110,'匪警')";
   statement.executeUpdate(sql);
   sql = "insert into class values(111,'不知111')";
   statement.executeUpdate(sql);
   connection.commit();

   sql = "insert into class values(112,'不知112')";
   statement.executeUpdate(sql);
   sql = "insert into class values(114,'据说咨询XX')";
   statement.executeUpdate(sql);
   sql = "insert into class values(115,'不知115')";
   statement.executeUpdate(sql);
   connection.rollback();
  }
  catch(Exception e)
  {
     e.printStackTrace();
  }
  finally{
   //resultSet.close();
   statement.close();
   connection.close();
  }