commons-dbutils实现增删改查(spring新注解)

Posted 2021-03-08 牛牛的自留地

1、maven依赖

<?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.ly.spring</groupId>
    <artifactId>spring04</artifactId>
    <version>1.0-SNAPSHOT</version>
    <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>commons-dbutils</groupId>
            <artifactId>commons-dbutils</artifactId>
            <version>1.6</version>
        </dependency>
        <dependency>
            <groupId>c3p0</groupId>
            <artifactId>c3p0</artifactId>
            <version>0.9.0.2</version>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.10</version>
            <scope>test</scope>
        </dependency>
    </dependencies>
</project>

2、实体类

package com.ly.spring.domain;

import java.io.Serializable;

public class Account implements Serializable {
    private Integer id;
    private Integer uid;
    private double money;

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public Integer getUid() {
        return uid;
    }

    public void setUid(Integer uid) {
        this.uid = uid;
    }

    public double getMoney() {
        return money;
    }

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

    @Override
    public String toString() {
        return "Account{" +
                "id=" + id +
                ", uid=" + uid +
                ", money=" + money +
                ‘}‘;
    }
}

 

3、Service接口

package com.ly.spring.service;

import com.ly.spring.domain.Account;

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

public interface IAccountService {
    public List<Account> findAll() throws SQLException;
    public Account findOne(Integer id) throws SQLException;
    public void save(Account account) throws SQLException;
    public void update(Account account) throws SQLException;
    public void delete(Integer id) throws SQLException;
}

4、Service实现类

package com.ly.spring.service.impl;

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

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

@Service("accountService")
public class AccountServiceImpl implements IAccountService {
    @Autowired
    private IAccountDao accountDao;
    public List<Account> findAll() throws SQLException {
        return accountDao.findAll();
    }

    @Override
    public Account findOne(Integer id) throws SQLException {
        return accountDao.findOne(id);
    }

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

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

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

5、Dao接口

package com.ly.spring.dao;

import com.ly.spring.domain.Account;

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

public interface IAccountDao {
    public List<Account> findAll() throws SQLException;
    public Account findOne(Integer id) throws SQLException;
    public void save(Account account) throws SQLException;
    public void update(Account account) throws SQLException;
    public void delete(Integer id) throws SQLException;
}

6、Dao实现类

package com.ly.spring.dao.impl;

import com.ly.spring.dao.IAccountDao;
import com.ly.spring.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("accountDao")
public class AccountDaoImpl implements IAccountDao {
    @Autowired
    private QueryRunner queryRunner;
    public List<Account> findAll() throws SQLException {
        return queryRunner.query("select * from account",new BeanListHandler<Account>(Account.class));
    }

    @Override
    public Account findOne(Integer id) throws SQLException {
        return queryRunner.query("select * from account where id = ?",new BeanHandler<Account>(Account.class),id);
    }

    @Override
    public void save(Account account) throws SQLException {
        queryRunner.update("insert into account(uid,money) values(?,?)",account.getUid(),account.getMoney());
    }

    @Override
    public void update(Account account) throws SQLException {
        queryRunner.update("update account set money = ? where id = ?",account.getMoney(),account.getId());
    }

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

7、jdbc资源文件

jdbc.url = jdbc:mysql://localhost:3306/db01
jdbc.driver = com.mysql.jdbc.Driver
jdbc.username = root
jdbc.password = root

 

8、spring主配置类

package com.ly.spring.config;
import org.springframework.context.annotation.*;
//@Configuration：用于标记此类为配置类
/**
 * @Configuration说明：
 * 1、若该类为new AnnotationConfigApplicationContext()的入参类型，则可以省略@Configuration注解
 * 2、若该类是配置类但不是new AnnotationConfigApplicationContext()的入参类型(JdbcConfig.java)，
 * 且引入该配置类的方式是@ComponentScan而非@Import时，不可以省略@Configuration注解
 * 3、若是通过@Import引入的该配置类(JdbcConfig.java)，则被引入的配置类可省略@Configuration注解
 * 4、@ComponentScan({"com.ly.spring","xx.xxx"})可以配置多个
 */
@Configuration
//@ComponentScan:用于指定spring注解扫描的包
@ComponentScan("com.ly.spring")
//@PropertySource:指定外部properties文件
@PropertySource("classpath:db.properties")
//@Import:引入另外一个配置类
/**
 * @Import说明
 * 1、若需要引入的类通过@ComponentScan可以被扫描到，且该类有@Configuration注解则不需要配置@Import注解引入该配置类
 * 2、使用@Import引入配置类时，该配置类可以省略@Configuration注解
 * 3、@Import({JdbcConfig.class,xxx.class}) 可以引入多个
 */
@Import(JdbcConfig.class)
public class SpringConfiguration {

}

9、jdbc配置类

package com.ly.spring.config;

import com.mchange.v2.c3p0.ComboPooledDataSource;
import org.apache.commons.dbutils.QueryRunner;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Scope;

import javax.sql.DataSource;

//@Configuration：用于标记此类为配置类
@Configuration
public class JdbcConfig {
    //@Value：用于读取资源文件中指定key对用的值
    @Value("${jdbc.url}")
    private String jdbcUrl;
    @Value("${jdbc.driver}")
    private String jdbcDriver;
    @Value("${jdbc.username}")
    private String username;
    @Value("${jdbc.password}")
    private String password;

    //@Bean用于在spring容器中创建方法返回值类型的bean,创建的bean默认id为方法名
    //@Bean配置了name属性时即指定了创建的bean对应的id
    @Bean
    //@Scope：指定创建的bean的作用范围，默认是单例的
    @Scope("singleton")
    //当方法中有参数且没有@Qualifier注解指定bean的id时，会自动从spring容器中按照@Autowired注解的方式去注入bean
    //当方法中有参数且有@Qualifier注解指定bean的id时，会根据指定的id去spring容器中寻找对应的bean
    public QueryRunner getQueryRunner(@Qualifier("dataSource") DataSource dataSource) {
        return new QueryRunner(dataSource);
    }

    //name指定创建的bean在spring容器中的id
    @Bean(name = "dataSource")
    public DataSource getDataSource() {
        try {
            ComboPooledDataSource comboPooledDataSource = new ComboPooledDataSource();
            comboPooledDataSource.setDriverClass(jdbcDriver);
            comboPooledDataSource.setJdbcUrl(jdbcUrl);
            comboPooledDataSource.setUser(username);
            comboPooledDataSource.setPassword(password);
            return comboPooledDataSource;
        }catch (Exception e) {
            throw new RuntimeException(e);
        }
    }
}

 

10、测试类

package com.ly.spring.test;

import com.ly.spring.config.JdbcConfig;
import com.ly.spring.config.SpringConfiguration;
import com.ly.spring.domain.Account;
import com.ly.spring.service.IAccountService;
import org.apache.commons.dbutils.QueryRunner;
import org.junit.Before;
import org.junit.Test;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;

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

public class MainTest {
    private AnnotationConfigApplicationContext context;
    private IAccountService accountService;
    @Before
    public void init() {
        //通过注解获取spring容器
        //可以同时指定多个配置类
        //context = new AnnotationConfigApplicationContext(SpringConfiguration.class, JdbcConfig.class);
        context = new AnnotationConfigApplicationContext(SpringConfiguration.class);
        accountService = context.getBean("accountService",IAccountService.class);
    }

    @Test
    public void testScope() {
        DataSource dataSource1 = context.getBean("dataSource", DataSource.class);
        DataSource dataSource2 = context.getBean("dataSource", DataSource.class);
        System.out.println(dataSource1 == dataSource2);

        QueryRunner queryRunner1 = context.getBean("getQueryRunner", QueryRunner.class);
        QueryRunner queryRunner2 = context.getBean("getQueryRunner", QueryRunner.class);
        System.out.println(queryRunner1);
        System.out.println(queryRunner1 == queryRunner2);
    }

    @Test
    public void findAll() throws SQLException {
        List<Account> accounts = accountService.findAll();
        System.out.println(accounts);
    }

    @Test
    public void findOne() throws SQLException {
        Account account = accountService.findOne(3);
        System.out.println(account);
    }

    @Test
    public void save() throws SQLException {
        Account account = new Account();
        account.setUid(52);
        account.setMoney(6000);
        accountService.save(account);
    }

    @Test
    public void update() throws SQLException {
        Account account = new Account();
        account.setId(5);
        account.setMoney(100000);
        accountService.update(account);
    }
    @Test
    public void delete() throws SQLException {
        accountService.delete(5);
    }
}

11、补充spring整合junit，修改如下：

11.1、引入spring-test的jar包

<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-test</artifactId>
    <version>5.0.2.RELEASE</version>
    <scope>test</scope>
</dependency>

11.2、在测试类中使用@RunWith注解替换junit的main方法

11.3、在测试类中使用@ContextConfiguration注解指定spring配置文件的位置或者spring配置类

package com.ly.spring.test;

import com.ly.spring.config.SpringConfiguration;
import com.ly.spring.domain.Account;
import com.ly.spring.service.IAccountService;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import java.sql.SQLException;
import java.util.List;
//@RunWith:用于替换junit的main方法
@RunWith(SpringJUnit4ClassRunner.class)
//@ContextConfiguration：用于指定spring配置文件的位置或者spring配置类
/**
 * @ContextConfiguration说明
 * 1、locations用于指定spring配置文件的位置locations = "classpath:bean.xml"
 * 2、classes用于指定spring配置类
 */
@ContextConfiguration(classes = SpringConfiguration.class)
public class MainTest {
    @Autowired
    private IAccountService accountService;

    @Test
    public void findAll() throws SQLException {
        List<Account> accounts = accountService.findAll();
        System.out.println(accounts);
    }

    @Test
    public void findOne() throws SQLException {
        Account account = accountService.findOne(3);
        System.out.println(account);
    }

    @Test
    public void save() throws SQLException {
        Account account = new Account();
        account.setUid(52);
        account.setMoney(6000);
        accountService.save(account);
    }

    @Test
    public void update() throws SQLException {
        Account account = new Account();
        account.setId(5);
        account.setMoney(100000);
        accountService.update(account);
    }
    @Test
    public void delete() throws SQLException {
        accountService.delete(5);
    }
}

11.4、SpringJUnit4ClassRunner requires JUnit 4.12 or higher报错解决

需升级junit版本4.12及以上

<dependency>
    <groupId>junit</groupId>
    <artifactId>junit</artifactId>
    <version>4.12</version>
    <scope>test</scope>
</dependency>