spring xml 配置实现数据库简单的增删改查（CRUD）
1.导入需要的maven坐标
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0modelVersion>
<groupId>com.cenzngroupId>
<artifactId>springXMLartifactId>
<version>1.0-SNAPSHOTversion>
<dependencies>
<dependency>
<groupId>org.springframeworkgroupId>
<artifactId>spring-contextartifactId>
<version>5.2.5.RELEASEversion>
dependency>
<dependency>
<groupId>commons-dbutilsgroupId>
<artifactId>commons-dbutilsartifactId>
<version>1.7version>
dependency>
<dependency>
<groupId>mysqlgroupId>
<artifactId>mysql-connector-javaartifactId>
<version>8.0.19version>
dependency>
<dependency>
<groupId>c3p0groupId>
<artifactId>c3p0artifactId>
<version>0.9.1.2version>
dependency>
<dependency>
<groupId>junitgroupId>
<artifactId>junitartifactId>
<version>4.12version>
dependency>
dependencies>
project>
2.目录结构
3.数据库sql
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);
4.实体类Account.java
package com.cenzn.domain;
public class Account {
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;
}
@Override
public String toString() {
return "Account{" +
"id=" + id +
", name='" + name + '\'' +
", money=" + money +
'}';
}
}
5.业务层接口类IAccountService.java
package com.cenzn.service;
import com.cenzn.domain.Account;
import java.util.List;
public interface IAccountService {
void saveAccount(Account account);
void deleteAccount(Integer accountId);
void updateAccount(Account account);
List<Account> findAllAccount();
Account findAccountById(Integer accountId);
}
6.业务层实现类AccountServiceImpl.java
package com.cenzn.service.impl;
import com.cenzn.dao.IAccoutDao;
import com.cenzn.domain.Account;
import com.cenzn.service.IAccountService;
import java.util.List;
public class AccountServiceImpl implements IAccountService {
private IAccoutDao iAccoutDao;
public void setiAccoutDao(IAccoutDao iAccoutDao) {
this.iAccoutDao = iAccoutDao;
}
public void saveAccount(Account account) {
iAccoutDao.saveAccount(account);
}
public void deleteAccount(Integer accountId) {
iAccoutDao.deleteAccount(accountId);
}
public void updateAccount(Account account) {
iAccoutDao.updateAccount(account);
}
public List<Account> findAllAccount() {
return iAccoutDao.findAllAccount();
}
public Account findAccountById(Integer accountId) {
return iAccoutDao.findAccountById(accountId);
}
}
7.持久层接口类IAccountDao.java
package com.cenzn.dao;
import com.cenzn.domain.Account;
import java.util.List;
public interface IAccoutDao {
int saveAccount(Account account);
void deleteAccount(Integer accountId);
void updateAccount(Account account);
List<Account> findAllAccount();
Account findAccountById(Integer accountId);
}
8.持久层实现类AccountDaoImpl.java
package com.cenzn.dao.impl;
import com.cenzn.dao.IAccoutDao;
import com.cenzn.domain.Account;
import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.handlers.BeanHandler;
import org.apache.commons.dbutils.handlers.BeanListHandler;
import java.util.List;
public class AccountDaoImpl implements IAccoutDao {
private QueryRunner runner;
public void setRunner(QueryRunner runner) {
this.runner = runner;
}
public int saveAccount(Account account) {
try{
return runner.update("insert into account(name,money)values(?,?)" ,account.getName(),account.getMoney());
}catch (Exception e){
throw new RuntimeException(e);
}
}
public void deleteAccount(Integer accountId) {
try{
runner.update("delete from account where id = ?" ,accountId);
}catch (Exception e){
throw new RuntimeException(e);
}
}
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);
}
}
public List<Account> findAllAccount() {
try{
return runner.query("select * from account" ,new BeanListHandler<Account>(Account.class));
}catch (Exception e){
throw new RuntimeException(e);
}
}
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);
}
}
}
9.配置文件bean.xml
<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">
<bean id="accountService" class="com.cenzn.service.impl.AccountServiceImpl">
<property name="iAccoutDao" ref="accountDao"/>
bean>
<bean id="accountDao" class="com.cenzn.dao.impl.AccountDaoImpl">
<property name="runner" ref="queryRunner"/>
bean>
<bean id="queryRunner" class="org.apache.commons.dbutils.QueryRunner" scope="prototype">
<constructor-arg name="ds" ref="dateSource"/>
bean>
<bean id="dateSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
<property name="driverClass" value="com.mysql.jdbc.Driver"/>
<property name="jdbcUrl" value="jdbc:mysql:///spring?serverTimezone=UTC"/>
<property name="user" value="root"/>
<property name="password" value="root"/>
bean>
beans>
10.测试类AccountServiceTest.java
package com.cenzn.test;
import com.cenzn.domain.Account;
import com.cenzn.service.impl.AccountServiceImpl;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import java.util.List;
public class AccountServiceTest {
@Test
public void testFindAll(){
ApplicationContext ac = new ClassPathXmlApplicationContext("bean.xml");
AccountServiceImpl accountService = ac.getBean("accountService",AccountServiceImpl.class);
List<Account> accounts = accountService.findAllAccount();
for(Account account : accounts){
System.out.println(account);
}
}
@Test
public void testFindById(){
ApplicationContext ac = new ClassPathXmlApplicationContext("bean.xml");
AccountServiceImpl accountService = ac.getBean("accountService",AccountServiceImpl.class);
System.out.println(accountService.findAccountById(2));
}
@Test
public void testSave(){
Account account = new Account();
account.setName("小小");
account.setMoney(1200d);
ApplicationContext ac = new ClassPathXmlApplicationContext("bean.xml");
AccountServiceImpl accountService = ac.getBean("accountService",AccountServiceImpl.class);
accountService.saveAccount(account);
}
@Test
public void testDelete(){
ApplicationContext ac = new ClassPathXmlApplicationContext("bean.xml");
AccountServiceImpl accountService = ac.getBean("accountService",AccountServiceImpl.class);
accountService.deleteAccount(4);
}
@Test
public void testUpdate(){
ApplicationContext ac = new ClassPathXmlApplicationContext("bean.xml");
AccountServiceImpl accountService = ac.getBean("accountService",AccountServiceImpl.class);
Account account = accountService.findAccountById(5);
account.setMoney(2000d);
accountService.updateAccount(account);
}
}
11.遇到的坑
https://blog.csdn.net/qq_43589241/article/details/105656149