使用 spring 的 IoC 的实现账户的CRUD

首先通过maven导入
mysql,
commons-dbutils,
spring-context,
c3p0,
junit
等所需jar包
然后创建数据库和编写实体类

create table account(
   id int primary key auto_increment,
   name varchar(40),
   money float
)character set utf8 collate utf8_general_ci;

insert into account(name,money) values('aaa',1000);
insert into account(name,money) values('bbb',1000);
insert into account(name,money) values('ccc',1000);

Account.java

/**
* 账户的实体类
*/
public class Account implements Serializable {
private Integer id;
private String name;
private Float 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;
}
}

编写持久层DAO代码

/**
* 账户的持久层接口
*/
public interface IAccountDao {
/**
* 保存
* @param account
*/
void save(Account account);
/**
* 更新
* @param account
*/
void update(Account account);
/**
* 删除
* @param accountId
*/
void delete(Integer accountId);
/**
* 根据 id 查询
* @param accountId
* @return
*/
Account findById(Integer accountId);
/**
* 查询所有
* @return
*/
List<Account> findAll();
}

Dao层实现类
public class AccountDaoImpl implements IAccountDao {

    private QueryRunner runner;

    @Override
    public List<Account> findAllAccount() {
        try{
            return runner.query("select * from account",new BeanListHandler<Account>(Account.class));
        }catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

    @Override
    public Account findAccountById(Integer accountId) {
        try{
            return runner.query("select * from account where id = ? ",new BeanHandler<Account>(Account.class),accountId);
        }catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

    @Override
    public void saveAccount(Account account) {
        try{
            runner.update("insert into account(name,money)values(?,?)",account.getName(),account.getMoney());
        }catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

    @Override
    public void updateAccount(Account account) {
        try{
            runner.update("update account set name=?,money=? where id=?",account.getName(),account.getMoney(),account.getId());
        }catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

    @Override
    public void deleteAccount(Integer accountId) {
        try{
            runner.update("delete from account where id=?",accountId);
        }catch (Exception e) {
            throw new RuntimeException(e);
        }
    }
}

编写业务层Service层

package com.itheima.service;

import com.itheima.domain.Account;

import java.util.List;

/**
 * 账户的业务层接口
 */
public interface IAccountService {

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

    /**
     * 查询一个
     * @return
     */
    Account findAccountById(Integer accountId);

    /**
     * 保存
     * @param account
     */
    void saveAccount(Account account);

    /**
     * 更新
     * @param account
     */
    void updateAccount(Account account);

    /**
     * 删除
     * @param acccountId
     */
    void deleteAccount(Integer acccountId);
}

Service层实现类
public class AccountServiceImpl implements IAccountService {
   private IAccountDao accountDao;
   public void setAccountDao(IAccountDao accountDao) {
      this.accountDao = accountDao;
   }
   @Override
   public void saveAccount(Account account) {
      accountDao.save(account);
   }
   @Override
   public void updateAccount(Account account) {
      accountDao.update(account);
   }
   @Override
   public void deleteAccount(Integer accountId) {
      accountDao.delete(accountId);
  }
   @Override
   public Account findAccountById(Integer accountId) {
      return accountDao.findById(accountId);
   }
   @Override
   public List<Account> findAllAccount() {
      return accountDao.findAll();
   }
}

bean.xml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
http://www.springframework.org/schema/beans/spring-beans.xsd">
<!-- 配置 service -->
<bean id="accountService" class="com.itheima.service.impl.AccountServiceImpl">
   <property name="accountDao" ref="accountDao"></property>
</bean>
<!-- 配置 dao -->
<bean id="accountDao" class="com.itheima.dao.impl.AccountDaoImpl">
   <property name="dbAssit" ref="dbAssit"></property>
</bean>
<!-- 配置 dbAssit 此处我们只注入了数据源，表明每条语句独立事务-->
<bean id="dbAssit" class="com.itheima.dbassit.DBAssit">
   <property name="dataSource" ref="dataSource"></property>
</bean>
<!-- 配置数据源 -->
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
   <property name="driverClass" value="com.mysql.jdbc.Driver"></property>
   <property name="jdbcUrl" value="jdbc:mysql:///spring_day02"></property>
   <property name="user" value="root"></property>
   <property name="password" value="1234"></property>
</bean>
</beans>