使用注解方式实现账户的CRUD

1 需求和技术要求

1.1 需求

• 实现账户的CRUD。

1.2 技术要求

• 使用Spring的IOC实现对象的管理。
• 使用QueryRunner作为持久层的解决方案。
• 使用C3p0作为数据源。

2 环境搭建并配置

2.1 导入所需要的依赖jar包的maven坐标

<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-context</artifactId>
    <version>5.2.0.RELEASE</version>
</dependency>
<dependency>
    <groupId>junit</groupId>
    <artifactId>junit</artifactId>
    <version>4.12</version>
</dependency>
<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <version>8.0.17</version>
</dependency>
<dependency>
    <groupId>commons-dbutils</groupId>
    <artifactId>commons-dbutils</artifactId>
    <version>1.7</version>
</dependency>
<dependency>
    <groupId>com.mchange</groupId>
    <artifactId>c3p0</artifactId>
    <version>0.9.5.4</version>
</dependency>

2.2 数据库脚本

SET NAMES utf8mb4;
SET FOREIGN_KEY_CHECKS = 0;

-- ----------------------------
-- Table structure for account
-- ----------------------------
DROP TABLE IF EXISTS `account`;
CREATE TABLE `account`  (
  `id` int(11) NOT NULL AUTO_INCREMENT COMMENT '主键',
  `name` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '名称',
  `money` double(11, 0) NULL DEFAULT NULL COMMENT '余额',
  PRIMARY KEY (`id`) USING BTREE
) ENGINE = InnoDB CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Dynamic;

-- ----------------------------
-- Records of account
-- ----------------------------
INSERT INTO `account` VALUES (1, 'aaa', 1000);
INSERT INTO `account` VALUES (2, 'bbb', 1000);

SET FOREIGN_KEY_CHECKS = 1;

2.3 编写实体类

• Account.java

package com.sunxiaping.spring5.domain;

import java.io.Serializable;

/**
 * 账户
 */
public class Account implements Serializable {

    private Integer id;

    private String name;

    private Double 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 Double getMoney() {
        return money;
    }

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

}

2.4 编写持久层代码

• IAccountDao.java

package com.sunxiaping.spring5.dao;

import com.sunxiaping.spring5.domain.Account;

import java.util.List;

/**
 * 账户的持久层接口
 */
public interface IAccountDao {

    /**
     * 保存账户
     *
     * @param account
     */
    void save(Account account);

    /**
     * 更新账户
     *
     * @param account
     */
    void update(Account account);

    /**
     * 删除账户
     *
     * @param id
     */
    void delete(Integer id);

    /**
     * 根据主键查询账户信息
     *
     * @param id
     * @return
     */
    Account findById(Integer id);

    /**
     * 查询所有
     *
     * @return
     */
    List<Account> findAll();

}

• AccountDaoImpl.java

package com.sunxiaping.spring5.dao.impl;

import com.sunxiaping.spring5.dao.IAccountDao;
import com.sunxiaping.spring5.domain.Account;
import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.handlers.BeanHandler;
import org.apache.commons.dbutils.handlers.BeanListHandler;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Repository;

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

@Repository
public class AccountDaoImpl implements IAccountDao {

    @Autowired
    private QueryRunner queryRunner;

    @Override
    public void save(Account account) {
        try {
            queryRunner.update("insert into account(name,money) values (?,?)", account.getName(), account.getMoney());
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }

    @Override
    public void update(Account account) {
        try {
            queryRunner.update("update account set name=?,money=? where id = ?", account.getName(), account.getMoney(), account.getId());
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }

    @Override
    public void delete(Integer id) {
        try {
            queryRunner.update("delete from account where id = ?", id);
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }

    @Override
    public Account findById(Integer id) {
        try {
            return queryRunner.query("select * from account where id = ?", new BeanHandler<>(Account.class), id);
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return null;
    }

    @Override
    public List<Account> findAll() {
        try {
            return queryRunner.query("select * from account", new BeanListHandler<>(Account.class));
        } catch (SQLException e) {
            e.printStackTrace();
        }

        return null;
    }
}

2.5 编写业务层代码

• IAccountService.java

package com.sunxiaping.spring5.service;

import com.sunxiaping.spring5.domain.Account;

import java.util.List;

public interface IAccountService {

    /**
     * 保存账户
     *
     * @param account
     */
    void save(Account account);

    /**
     * 更新账户
     *
     * @param account
     */
    void update(Account account);

    /**
     * 删除账户
     *
     * @param id
     */
    void delete(Integer id);

    /**
     * 根据主键查询账户信息
     *
     * @param id
     * @return
     */
    Account findById(Integer id);

    /**
     * 查询所有
     *
     * @return
     */
    List<Account> findAll();
}

• AccountServiceImpl.java

package com.sunxiaping.spring5.service.impl;

import com.sunxiaping.spring5.dao.IAccountDao;
import com.sunxiaping.spring5.domain.Account;
import com.sunxiaping.spring5.service.IAccountService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

@Service
public class AccountServiceImpl implements IAccountService {

    @Autowired
    private IAccountDao accountDao;

    @Override
    public void save(Account account) {
        accountDao.save(account);
    }

    @Override
    public void update(Account account) {
        accountDao.update(account);
    }

    @Override
    public void delete(Integer id) {
        accountDao.delete(id);
    }

    @Override
    public Account findById(Integer id) {
        return accountDao.findById(id);
    }

    @Override
    public List<Account> findAll() {
        return accountDao.findAll();
    }
}

2.6 创建并配置applicationContext.xml

• applicationContext.xml

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

    <!--告知Spring创建容器的时候要扫描的包-->
    <context:component-scan base-package="com.sunxiaping.spring5"></context:component-scan>
    <!--配置QueryRunner-->
    <bean id="queryRunner" class="org.apache.commons.dbutils.QueryRunner" scope="prototype">
        <constructor-arg name="ds" ref="dataSource"></constructor-arg>
    </bean>

    <!--配置数据源-->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="jdbcUrl" value="jdbc:mysql://localhost:3306/test?useUnicode=true&amp;characterEncoding=UTF-8&amp;autoReconnect=true&amp;useSSL=false&amp;serverTimezone=GMT%2B8&amp;allowPublicKeyRetrieval=true"></property>
        <property name="driverClass" value="com.mysql.cj.jdbc.Driver"></property>
        <property name="user" value="root"></property>
        <property name="password" value="123456"></property>
    </bean>

</beans>

2.7 测试

• 示例：

package com.sunxiaping;

import com.sunxiaping.spring5.domain.Account;
import com.sunxiaping.spring5.service.IAccountService;
import org.junit.Before;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class spring5Test {
    ApplicationContext context = null;

    @Before
    public void before() {
        context = new ClassPathXmlApplicationContext("applicationContext.xml");
    }

    @Test
    public void test() {

        IAccountService accountService = context.getBean(IAccountService.class);
        Account account = new Account();
        account.setName("xxx");
        account.setMoney(1.2);
        accountService.save(account);
    }

}