QueryRunner:SQL语句的操作对象,可以设置查询结果集的封装策略
创建方法:QueryRunner runner=new QueryRunner(dataSource)
ResultSetHandler:封装数据的策略的对象
BeanHandler:将SQL查询的结果集转换成一个javaBean
Account account=runner.query(sql,new BeanHandler
(Account.class),3); BeanListHandler:将SQL查询的结果集转换成一个集合的对象,集合中存储javaBean
用法:list
list=runner.query(sql,new BeanListHandler (Account.class));
commons-dbutils
commons-dbutils
1.4
c3p0
c3p0
0.9.1.2
mysql
mysql-connector-java
5.1.6
junit
junit
4.12
org.springframework
spring-context
5.0.2.RELEASE
表结构和数据
SQL语句
CREATE TABLE account(
id int primary key AUTO_increment,
name varchar(40),
money float
);
insert into account(name,money) values('aaa',1000);
insert into account(name,money) values('bbb',1000);
insert into account(name,money) values('ccc',1000);
package com.itheiam.domain;
import lombok.Data;
import lombok.ToString;
import java.io.Serializable;
@Data
@ToString
public class Account implements Serializable {
private Integer id;
private String name;
private Float money;
}
/***
*账户的持久层接口
***/
public interface AccountDao {
/**
* 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 findAll();
}
/***
*账户的持久层接口实现类
***/
public class AccountDaoImpl implements AccountDao {
private QueryRunner runner;
/**
* 保存操作
* @param account
*/
public void save(Account account) {
try {
runner.update("insert into account(name,money)values(?,?)",account.getName(),account.getMoney());
} catch (SQLException e) {
e.printStackTrace();
}
}
/***
* 修改操作
* @param account
*/
public void update(Account account) {
try {
runner.update("update account set name=?,money=? where id=?",account.getName(),account.getMoney(),account.getId());
} catch (SQLException e) {
e.printStackTrace();
}
}
/**
* 删除操作
* @param accountId
*/
public void delete(Integer accountId) {
try {
runner.update("delete from account where id=?",accountId);
} catch (SQLException e) {
e.printStackTrace();
}
}
/**
* 根据ID查询
* @param accountId
* @return
*/
public Account findById(Integer accountId) {
try {
return runner.query("select * from account where id=?",new BeanHandler(Account.class),accountId);
} catch (SQLException e) {
e.printStackTrace();
}
return null;
}
/***
* 查询所有
* @return
*/
public List findAll() {
try {
return runner.query("select * from account",new BeanListHandler(Account.class));
} catch (SQLException e) {
e.printStackTrace();
}
return null;
}
/***
* 注入QueryRunner对象
* @param runner
*/
public void setRunner(QueryRunner runner) {
this.runner = runner;
}
}
/****
* 业务层接口
***/
public interface AccountService {
/**
* 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 findAll();
}
/****
* 业务层接口实现类
***/
public class AccountServiceImpl implements AccountService {
private AccountDao accountDao;
public void save(Account account) {
accountDao.save(account);
}
public void update(Account account) {
accountDao.update(account);
}
public void delete(Integer accountId) {
accountDao.delete(accountId);
}
public Account findById(Integer accountId) {
return accountDao.findById(accountId);
}
public List findAll() {
return accountDao.findAll();
}
public void setAccountDao(AccountDao accountDao) {
this.accountDao = accountDao;
}
public class AccountServiceTest {
private AccountService accountService;
@Before
public void init(){
ApplicationContext ac = new ClassPathXmlApplicationContext("bean.xml");
accountService = ac.getBean(AccountService.class);
}
/**
* 保存
*/
@Test
public void testSave(){
Account account = new Account();
account.setMoney(999f);
account.setName("小红");
accountService.save(account);
}
/**
* 更新
*/
@Test
public void testUpdate(){
//查询出id=3的账户,再修改
Account account = accountService.findById(4);
account.setName("zhangsan");
//修改
accountService.update(account);
}
/**
* 删除
*/
@Test
public void testDelete(){
Integer accountId=3;
accountService.delete(accountId);
}
/**
* 根据id查询
* @return
*/
@Test
public void testFindById(){
Integer accountId=3;
Account account = accountService.findById(accountId);
System.out.println(account);
}
/**
* 查询所有
* @return
*/
@Test
public void testFindAll(){
List accounts = accountService.findAll();
for (Account account : accounts) {
System.out.println(account);
}
}
}