Spring.xml+jdbcTemplate完成CRUD

约定不等于承诺〃 2022-02-15 10:00 208阅读 0赞

## 一、目录结构 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poYW5nMTUwMTE0_size_16_color_FFFFFF_t_70]

## 二、代码详解 ##

**1、bean.xml**

<?xml version="1.0" encoding="UTF-8"?>
    <beans xmlns="http://www.springframework.org/schema/beans"
           xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
           xmlns:context="http://www.springframework.org/schema/context"
           xsi:schemaLocation="http://www.springframework.org/schema/beans
            http://www.springframework.org/schema/beans/spring-beans.xsd
            http://www.springframework.org/schema/context
            http://www.springframework.org/schema/context/spring-context.xsd">
    
        
        <context:property-placeholder location="classpath:db.properties"/>
    
        
        <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" destroy-method="close">
            <property name="driverClass" value="${jdbc.driverClass}"/>
            <property name="JdbcUrl" value="${jdbc.jdbcUrl}"/>
            <property name="user" value="${jdbc.user}"/>
            <property name="password" value="${jdbc.password}"/>
        </bean>
    
        
        <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
            
            <constructor-arg name="dataSource" ref="dataSource"></constructor-arg>
        </bean>
    
        
        <bean id="userService" class="com.mollen.service.impl.UserServiceImpl">
            
            <property name="userDao" ref="userDao"></property>
        </bean>
    
        
        <bean id="userDao" class="com.mollen.dao.impl.UserDaoImpl">
            
            <property name="jdbcTemplate" ref="jdbcTemplate"></property>
        </bean>
    </beans>

**2.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.mollen</groupId>
        <artifactId>spring_exam</artifactId>
        <version>1.0-SNAPSHOT</version>
    
        <dependencies>
    
            <dependency>
                <groupId>junit</groupId>
                <artifactId>junit</artifactId>
                <version>4.12</version>
            </dependency>
    
            <dependency>
                <groupId>mysql</groupId>
                <artifactId>mysql-connector-java</artifactId>
                <version>5.1.38</version>
            </dependency>
    
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-jdbc</artifactId>
                <version>5.0.2.RELEASE</version>
            </dependency>
    
            <dependency>
                <groupId>c3p0</groupId>
                <artifactId>c3p0</artifactId>
                <version>0.9.1.2</version>
            </dependency>
    
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-context</artifactId>
                <version>5.0.2.RELEASE</version>
            </dependency>
    
        </dependencies>
    
        <build>
            <plugins>
                <plugin>
                    <groupId>org.apache.maven.plugins</groupId>
                    <artifactId>maven-compiler-plugin</artifactId>
                    <version>3.7.0</version>
                    <configuration>
                        <target>1.8</target>
                        <source>1.8</source>
                    </configuration>
                </plugin>
            </plugins>
        </build>

**3、数据库表：user**

![在这里插入图片描述][20190424114140332.png]

**4、数据源配置：db.properties**

jdbc.driverClass=com.mysql.jdbc.Driver
    jdbc.jdbcUrl=jdbc:mysql://localhost:3306/mybatis_day01
    jdbc.user=root
    jdbc.password=root

**5、service层**

1、Userservice.java

package com.mollen.service;
    
    import com.mollen.bean.User;
    
    import java.util.Date;
    import java.util.List;
    
    /**
     * @ClassName: UserService
     * @Auther: Mollen
     * @CreateTime: 2018-11-03  19:40:55
     * @Description:
     */
    public interface UserService {
    
        /**
         * 1.添加/更新用户
         */
        public void addOrSaveUser(User user);
    
        /**
         * 2.删除用户
         */
        public void removeUser(Integer id);
    
        /**
         * 3.根据id查询用户
         */
        public User findById(Integer id);
    
        /**
         * 4.查询所有用户
         */
        public List<User> findAll();
    }

2、UserserviceImpl.java

package com.mollen.service.impl;
    
    import com.mollen.bean.User;
    import com.mollen.dao.UserDao;
    import com.mollen.service.UserService;
    
    import java.util.List;
    
    /**
     * @ClassName: UserServiceImpl
     * @Auther: Mollen
     * @CreateTime: 2018-11-03  19:41:22
     * @Description:
     */
    public class UserServiceImpl  implements UserService{
    
        private UserDao userDao;
    
        public void setUserDao(UserDao userDao) {
            this.userDao = userDao;
        }
    
        @Override
        public void addOrSaveUser(User user) {
            userDao.addOrSaveUser(user);
        }
    
        @Override
        public void removeUser(Integer id) {
            userDao.removeUser(id);
        }
    
        @Override
        public User findById(Integer id) {
            return userDao.findById(id);
        }
    
        @Override
        public List<User> findAll() {
            return userDao.findAll();
        }
    
    }

**6、dao层：**

1、UserDao.java

package com.mollen.dao;
    
    import com.mollen.bean.User;
    
    import java.util.List;
    
    /**
     * @ClassName: UserDao
     * @Auther: Mollen
     * @CreateTime: 2018-11-03  19:40:36
     * @Description:
     */
    public interface UserDao {
    
        /**
         * 1.添加/更新用户
         */
        public void addOrSaveUser(User user);
    
        /**
         * 2.删除用户
         */
        public void removeUser(Integer id);
    
        /**
         * 3.根据id查询用户
         */
        public User findById(Integer id);
    
        /**
         * 4.全查用户
         */
        public List<User> findAll();
    
    }

2、UserDaoImpl.java

package com.mollen.dao.impl;
    
    import com.mollen.bean.User;
    import com.mollen.dao.UserDao;
    import org.springframework.jdbc.core.BeanPropertyRowMapper;
    import org.springframework.jdbc.core.JdbcTemplate;
    
    import java.util.List;
    
    /**
     * @ClassName:  UserDaoImpl
     * @Auther:     Mollen
     * @CreateTime: 2018-11-03  19:41:46
     * @Description:
     */
    public class UserDaoImpl implements UserDao {
    
        private JdbcTemplate jdbcTemplate;
    
        public void setJdbcTemplate(JdbcTemplate jdbcTemplate) {
            this.jdbcTemplate = jdbcTemplate;
        }
    
        @Override
        public void addOrSaveUser(User user) {
            jdbcTemplate.update("INSERT INTO user VALUES (null,?,?,?,?)",user.getUsername(),user.getBirthday(),user.getSex(),user.getAddress());
    
        }
    
        @Override
        public void removeUser(Integer id) {
            jdbcTemplate.update("DELETE  FROM  user  where id = ?",id);
        }
    
        @Override
        public User findById(Integer id) {
            try {
                return jdbcTemplate.queryForObject("SELECT * FROM user WHERE id = ?",new BeanPropertyRowMapper<User>(User.class), id);
            }catch (Exception e){
                e.printStackTrace();
                return  null;
            }
        }
    
        @Override
        public List<User> findAll() {
            return  jdbcTemplate.query("select * from user",new BeanPropertyRowMapper<User>(User.class));
        }
    }

**7、测试类:Test.java**

package com.mollen.test;
    
    import com.mollen.bean.User;
    import com.mollen.service.UserService;
    import org.junit.After;
    import org.junit.Before;
    import org.junit.Test;
    import org.springframework.context.ApplicationContext;
    import org.springframework.context.support.ClassPathXmlApplicationContext;
    
    import java.text.ParseException;
    import java.text.SimpleDateFormat;
    import java.util.Date;
    import java.util.List;
    
    /**
     * @ClassName: test
     * @Auther: Mollen
     * @CreateTime: 2018-11-05  10:17:54
     * @Description:
     */
    public class MyTest {
    
        private  UserService userService;
    
        @Before
        public void init(){
            //创建web容器
            ApplicationContext applicationContext = new ClassPathXmlApplicationContext("beans.xml");
            //获取业务层bean对象
            userService = (UserService) applicationContext.getBean("userService");
        }
    
        @Test
        public void test01(){
            List<User> users = userService.findAll();
            for (User user : users) {
                System.out.println(user);
            }
        }
    
        @Test
        public void test02(){
            User user = userService.findById(41);
            System.out.println(user);
        }
    
        @Test
        public void test03(){
            userService.removeUser(49);
        }
    
        @Test
        public void test04() throws ParseException {
            Date birthday = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").parse("2018-02-27 17:47:08");
            User user = new User();
    
            user.setUsername("里斯");
            user.setBirthday(birthday);
            user.setSex("男");
            user.setAddress("杭州");
    
            userService.addOrSaveUser(user);
        }
    
        @After
        public void destory(){
    
        }
    }

注：多数据源配置可以根据$\{ \}里面的名字 和 db.properties配置文件里面的名字进行对应来区分

原文：[https://blog.csdn.net/mollen/article/details/83748041][https_blog.csdn.net_mollen_article_details_83748041]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poYW5nMTUwMTE0_size_16_color_FFFFFF_t_70]: /images/20220215/b4f169131b564d2bbe0ce0b80b3e7614.png
[20190424114140332.png]: /images/20220215/640caad055f24d3d811ff2d5160f8437.png
[https_blog.csdn.net_mollen_article_details_83748041]: https://blog.csdn.net/mollen/article/details/83748041