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  • commons-dbutils实现增删改查(spring新注解)

    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>
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  • 原文地址:https://www.cnblogs.com/liuyang-520/p/12341579.html
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