JDBC - implements实现接口 - XxxDAOImpl.java

实现接口

extends继承BaseDAO、实现CustomerDAO
CustomerDAO可以快速实现

1、写sql
2、调用BaseDAO

package com.atguigu3.dao;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.sql.Connection;
import java.sql.Date;
import java.util.List;
import com.atguigu2.bean.Customer;
public class CustomerDAOImpl extends BaseDAO<Customer> implements CustomerDAO{
    @Override
    public void insert(Connection conn, Customer cust) {
        String sql = "insert into customers(name,email,birth)values(?,?,?)";
        update(conn, sql,cust.getName(),cust.getEmail(),cust.getBirth());
    }
    @Override
    public void deleteById(Connection conn, int id) {
        String sql = "delete from customers where id = ?";
        update(conn, sql, id);
    }
    @Override
    public void update(Connection conn, Customer cust) {
        String sql = "update customers set name = ?,email = ?,birth = ? where id = ?";
        update(conn, sql,cust.getName(),cust.getEmail(),cust.getBirth(),cust.getId());
    }
    @Override
    public Customer getCustomerById(Connection conn, int id) {
        String sql = "select id,name,email,birth from customers where id = ?";
        Customer customer = getInstance(conn, sql,id);
        return customer;
    }
    @Override
    public List<Customer> getAll(Connection conn) {
        String sql = "select id,name,email,birth from customers";
        List<Customer> list = getForList(conn, sql);
        return list;
    }
    @Override
    public Long getCount(Connection conn) {
        String sql = "select count(*) from customers";
        return getValue(conn, sql);
    }
    @Override
    public Date getMaxBirth(Connection conn) {
        String sql = "select max(birth) from customers";
        return getValue(conn, sql);
    }
}