public class CategoryDaoImpl implements CategoryDao { @Override public void add(Category category){ try{ QueryRunner runner = new QueryRunner(JdbcUtils.getDataSource()); String sql = "insert into category(id,name) values(?,?)"; Object params[] = {category.getId(), category.getName()}; runner.update(sql, params); } catch(Exception e){ e.printStackTrace(); throw new RuntimeException(e); } } /* (non-Javadoc) * @see dao.impl.CategoryDao#find(java.lang.String) */ @Override public Category find(String id){ try { QueryRunner runner = new QueryRunner(JdbcUtils.getDataSource()); String sql = "select * from category where id=?"; return (Category)runner.query(sql, id, new BeanHandler(Category.class)); } catch (SQLException e) { e.printStackTrace(); throw new RuntimeException(e); } } /* (non-Javadoc) * @see dao.impl.CategoryDao#getAll() */ @Override public List<Category> getAll(){ try { QueryRunner runner = new QueryRunner(JdbcUtils.getDataSource()); String sql = "select * from category"; return (List<Category>)runner.query(sql, new BeanListHandler(Category.class)); } catch (SQLException e) { e.printStackTrace(); throw new RuntimeException(e); } } @Override public int delete(String id) { try { QueryRunner runner = new QueryRunner(JdbcUtils.getDataSource()); //执行删除的sql runner.update("delete from category where id=?",id); } catch (SQLException e) { throw new RuntimeException(e);//抛出运行异常 } return 1;//删除成功返回1表示结束 } @Override public void update(Category record) { try{ QueryRunner runner = new QueryRunner(JdbcUtils.getDataSource()); String sql = "update category set name=?,where id=? "; Object params[] = { record.getName(), record.getId()}; runner.update(sql, params); } catch(Exception e){ e.printStackTrace(); throw new RuntimeException(e); } } }帮我加一下注释

public class CategoryDaoImpl implements CategoryDao {

    // 添加分类
    @Override
    public void add(Category category){
        try{
            QueryRunner runner = new QueryRunner(JdbcUtils.getDataSource()); // 创建QueryRunner对象
            String sql = "insert into category(id,name) values(?,?)"; // SQL插入语句
            Object params[] = {category.getId(), category.getName()}; // 插入参数
            runner.update(sql, params); // 执行插入操作
        } catch(Exception e){
            e.printStackTrace(); // 打印异常信息
            throw new RuntimeException(e); // 抛出运行时异常
        }
    }

    // 根据分类ID查找分类信息
    @Override
    public Category find(String id){
        try {
            QueryRunner runner = new QueryRunner(JdbcUtils.getDataSource()); // 创建QueryRunner对象
            String sql = "select * from category where id=?"; // SQL查询语句
            return (Category)runner.query(sql, id, new BeanHandler(Category.class)); // 执行查询并返回结果
        } catch (SQLException e) {
            e.printStackTrace(); // 打印异常信息
            throw new RuntimeException(e); // 抛出运行时异常
        }
    }

    // 获取所有分类信息
    @Override
    public List<Category> getAll(){
        try {
            QueryRunner runner = new QueryRunner(JdbcUtils.getDataSource()); // 创建QueryRunner对象
            String sql = "select * from category"; // SQL查询语句
            return (List<Category>)runner.query(sql, new BeanListHandler(Category.class)); // 执行查询并返回结果
        } catch (SQLException e) {
            e.printStackTrace(); // 打印异常信息
            throw new RuntimeException(e); // 抛出运行时异常
        }
    }

    // 根据分类ID删除分类信息
    @Override
    public int delete(String id) { 
        try { 
            QueryRunner runner = new QueryRunner(JdbcUtils.getDataSource()); // 创建QueryRunner对象
            runner.update("delete from category where id=?",id); // 执行删除的SQL语句
        } catch (SQLException e) { 
            throw new RuntimeException(e); // 抛出运行时异常
        } 
        return 1; // 删除成功返回1表示结束
    }

    // 更新分类信息
    @Override
    public void update(Category record) {
        try{
            QueryRunner runner = new QueryRunner(JdbcUtils.getDataSource()); // 创建QueryRunner对象
            String sql = "update category set name=?,where id=? "; // SQL更新语句
            Object params[] = { record.getName(), record.getId()}; // 更新参数
            runner.update(sql, params); // 执行更新操作
        } catch(Exception e){
            e.printStackTrace(); // 打印异常信息
            throw new RuntimeException(e); // 抛出运行时异常
        }
    }

}

这段代码实现了对分类信息的增、删、改、查功能。其中，每个方法都调用了QueryRunner对象执行SQL语句，并返回结果或抛出异常。方法名和注释说明了各个方法的具体功能。