实际开发中Dao层使用JdbcTemplate

Posted 2021-03-11 lijiahaoAA

实体类

package com.itheima.domain;

import java.io.Serializable;

/**
 * @Author: lijiahao
 * @Description: 账户的实体类
 * @Data: Create in 1:32 2020/2/9
 * @Modified By:
 */
public class Account implements Serializable {

    private Integer id;
    private String name;
    private Float money;

    @Override
    public String toString() {
        return "account{" +
                "id=" + id +
                ", name=‘" + name + ‘‘‘ +
                ", money=" + money +
                ‘}‘;
    }

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Float getMoney() {
        return money;
    }

    public void setMoney(Float money) {
        this.money = money;
    }
}

Dao接口

package com.itheima.Dao;

import com.itheima.domain.Account;

/**
 * @Author: lijiahao
 * @Description: 帐户的持久性接口
 * @Data: Create in 2:30 2020/2/9
 * @Modified By:
 */
public interface IAccountDao {

    /**
     * @Author Lijiahao
     * @Description 根据id查帐户
     * @Date 2:31 2020/2/9
     * @Param [id]
     * @return com.itheima.domain.Account
     **/
    Account findAccountById(Integer id);
    //根据名字查帐户
    Account findAccountByName(String name);
    //更新帐户
    void updateAccount(Account account);
}

Dao具体实现类

package com.itheima.Dao.impl;

import com.itheima.Dao.IAccountDao;
import com.itheima.domain.Account;
import org.springframework.jdbc.core.BeanPropertyRowMapper;
import org.springframework.jdbc.core.JdbcTemplate;

import java.util.List;

/**
 * @Author: lijiahao
 * @Description:
 * @Data: Create in 2:32 2020/2/9
 * @Modified By:
 */
public class AccountDaoImpl implements IAccountDao {

    private JdbcTemplate jdbcTemplate;

    public void setJdbcTemplate(JdbcTemplate jdbcTemplate) {
        this.jdbcTemplate = jdbcTemplate;
    }

    public Account findAccountById(Integer id) {
        List<Account> accountList = jdbcTemplate.query("select * from account where id = ?", new BeanPropertyRowMapper<Account>(Account.class),id);
        return accountList.isEmpty()?null:accountList.get(0);
    }

    public Account findAccountByName(String name) {
        List<Account> accountList = jdbcTemplate.query("select * from account where name = ?", new BeanPropertyRowMapper<Account>(Account.class),name);
        if(accountList.isEmpty()){
            return null;
        }
        if(accountList.size()>1){
            throw new RuntimeException("结果集不唯一");
        }
        return accountList.get(0);
    }

    public void updateAccount(Account account) {
        jdbcTemplate.update("update account set name=? ,money=? where id = ?", account.getName(),account.getMoney(),account.getId());
    }
}

测试

package com.itheima.jdbctemplate;

import com.itheima.Dao.IAccountDao;
import com.itheima.domain.Account;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.jdbc.core.BeanPropertyRowMapper;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.RowMapper;

import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.List;

/**
 * @Author: lijiahao
 * @Description: jdbctemplate的最基本用法：CRUD
 * @Data: Create in 1:34 2020/2/9
 * @Modified By:
 */
public class JdbcTemplateDemo4 {
    public static void main(String[] args) {

        //1.获取容器
        ApplicationContext applicationContext = new ClassPathXmlApplicationContext("bean.xml");
        //2.获取对象
        IAccountDao accountDao = (IAccountDao) applicationContext.getBean("accountDao");

        Account account = accountDao.findAccountById(1);
        System.out.println(account);
        account.setMoney(10000f);
        accountDao.updateAccount(account);
    }
}

配置文件

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        https://www.springframework.org/schema/beans/spring-beans.xsd">

    <!--配置账户的持久层-->
    <bean id="accountDao" class="com.itheima.Dao.impl.AccountDaoImpl">
        <property name="jdbcTemplate" ref="jdbcTemplate"></property>
    </bean>
    <!--配置JdbTemplate-->
    <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
        <property name="dataSource" ref="dataSource"></property>
    </bean>

    <!--配置数据源-->
    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="com.mysql.cj.jdbc.Driver"></property>
        <property name="url" value="jdbc:mysql://localhost:3306/eesy?serverTimezone=Asia/Shanghai&amp;characterEncoding=utf8&amp;useSSL=false"></property>
        <property name="username" value="root"></property>
        <property name="password" value="123456"></property>
    </bean>
</beans>