我们的项目是Maven工程,项目结构如下:
pom.xml:
<?xml version="1.0" encoding="UTF-8"?>
<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>4.0.0</modelVersion>
<groupId>com.zl</groupId>
<artifactId>spring_day02_example_crud</artifactId>
<version>1.0-SNAPSHOT</version>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>8</source>
<target>8</target>
</configuration>
</plugin>
</plugins>
</build>
<packaging>jar</packaging>
<dependencies>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>5.0.2.RELEASE</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.6</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
</dependency>
<dependency>
<groupId>c3p0</groupId>
<artifactId>c3p0</artifactId>
<version>0.9.1.2</version>
</dependency>
<dependency>
<groupId>commons-dbutils</groupId>
<artifactId>commons-dbutils</artifactId>
<version>1.4</version>
</dependency>
</dependencies>
</project>
com.zl.domain.Account实体类:
package com.zl.domain;
public class Account {
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;
}
@Override
public String toString() {
return "Account{" +
"id=" + id +
", name='" + name + '\'' +
", money=" + money +
'}';
}
}
com.zl.service.AccountService接口:
package com.zl.service;
import com.zl.domain.Account;
import java.util.List;
public interface AccountService {
/**
* 查找所有账户
* @return
*/
List<Account> findAll();
/**
* 根据id查询账户
* @param id
* @return
*/
Account findById(Integer id);
/**
* 保存账户
* @param account
*/
void saveAccount(Account account);
/**
* 更新账户
* @param account
*/
void updateAccount(Account account);
/**
* 根据id删除用户
* @param id
*/
void deleteAccount(Integer id);
}
com.zl.service.AccountServiceImpl实现类:
package com.zl.service.impl;
import com.zl.dao.AccountDao;
import com.zl.domain.Account;
import com.zl.service.AccountService;
import java.util.List;
public class AccountServiceImpl implements AccountService {
private AccountDao dao;
public void setDao(AccountDao dao) {
this.dao = dao;
}
public List<Account> findAll() {
return dao.findAll();
}
public Account findById(Integer id) {
return dao.findById(id);
}
public void saveAccount(Account account) {
dao.saveAccount(account);
}
public void updateAccount(Account account) {
dao.updateAccount(account);
}
public void deleteAccount(Integer id) {
dao.deleteAccount(id);
}
}
com.zl.dao.AccountDao接口:
package com.zl.dao;
import com.zl.domain.Account;
import java.util.List;
public interface AccountDao {
/**
* 查找所有账户
* @return
*/
List<Account> findAll();
/**
* 根据id查询账户
* @param id
* @return
*/
Account findById(Integer id);
/**
* 保存账户
* @param account
*/
void saveAccount(Account account);
/**
* 更新账户
* @param account
*/
void updateAccount(Account account);
/**
* 根据id删除用户
* @param id
*/
void deleteAccount(Integer id);
}
com.zl.dao.AccountDaoImpl实现类:
package com.zl.dao.impl;
import com.zl.dao.AccountDao;
import com.zl.domain.Account;
import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.handlers.BeanHandler;
import org.apache.commons.dbutils.handlers.BeanListHandler;
import java.sql.SQLException;
import java.util.List;
public class AccountDaoImpl implements AccountDao {
private QueryRunner queryRunner;
public void setQueryRunner(QueryRunner queryRunner) {
this.queryRunner = queryRunner;
}
public List<Account> findAll() {
try {
return queryRunner.query("select * from account",new BeanListHandler<Account>(Account.class));
} catch (SQLException e) {
throw new RuntimeException(e);
}
}
public Account findById(Integer id) {
try {
return queryRunner.query("select * from account where id=?",new BeanHandler<Account>(Account.class),id);
} catch (SQLException e) {
throw new RuntimeException(e);
}
}
public void saveAccount(Account account) {
try {
queryRunner.update("insert into account(name,money) values(?,?)",account.getName(),account.getMoney());
} catch (SQLException e) {
throw new RuntimeException(e);
}
}
public void updateAccount(Account account) {
try {
queryRunner.update("update account set name=?,money=? where id=?",account.getName(),account.getMoney(),account.getId());
} catch (SQLException e) {
throw new RuntimeException(e);
}
}
public void deleteAccount(Integer id) {
try {
queryRunner.update("delete from account where id=?",id);
} catch (SQLException e) {
throw new RuntimeException(e);
}
}
}
resources文件夹下的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
http://www.springframework.org/schema/beans/spring-beans.xsd">
<bean id="accountService" class="com.zl.service.impl.AccountServiceImpl">
<property name="dao" ref="accountDao"></property>
</bean>
<bean id="accountDao" class="com.zl.dao.impl.AccountDaoImpl">
<property name="queryRunner" ref="runner"></property>
</bean>
<bean id="runner" class="org.apache.commons.dbutils.QueryRunner">
<constructor-arg name="ds" ref="dataSource"></constructor-arg>
</bean>
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
<property name="driverClass" value="com.mysql.jdbc.Driver"></property>
<property name="jdbcUrl" value="jdbc:mysql://localhost:3306/spring"></property>
<property name="user" value="root"></property>
<property name="password" value="root"></property>
</bean>
</beans>
测试类:
import com.zl.domain.Account;
import com.zl.service.AccountService;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import java.util.List;
public class TestCRUD {
ApplicationContext ac = new ClassPathXmlApplicationContext("bean.xml");
AccountService service = ac.getBean("accountService", AccountService.class);
@Test
public void testFindAll(){
List<Account> accounts = service.findAll();
accounts.stream().forEach(System.out::println);
}
@Test
public void testFindById() {
Account account = service.findById(2);
System.out.println(account);
}
@Test
public void testSaveAaccount() {
Account account = new Account();
account.setName("zhangsan");
account.setMoney(5000f);
service.saveAccount(account);
}
@Test
public void testUpdateAccount() {
Account account = new Account();
account.setId(2);
account.setMoney(5000f);
account.setName("LR");
service.updateAccount(account);
}
@Test
public void testDeleteAccount() {
service.deleteAccount(4);
}
}
数据库:
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);
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