2022.5.31 整合mybatis

12、整合mybatis

导包

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 1 <dependencies>
 2     <dependency>
 3         <groupId>junit</groupId>
 4         <artifactId>junit</artifactId>
 5         <version>4.12</version>
 6     </dependency>
 7 
 8     <dependency>
 9         <groupId>mysql</groupId>
10         <artifactId>mysql-connector-java</artifactId>
11         <version>8.0.29</version>
12     </dependency>
13     <dependency>
14         <groupId>org.mybatis</groupId>
15         <artifactId>mybatis</artifactId>
16         <version>3.5.9</version>
17     </dependency>
18     <dependency>
19         <groupId>org.springframework</groupId>
20         <artifactId>spring-webmvc</artifactId>
21         <version>5.3.20</version>
22     </dependency>
23     <!--spring操作数据库,还需要一个spring-jdbc-->
24     <dependency>
25         <groupId>org.springframework</groupId>
26         <artifactId>spring-jdbc</artifactId>
27         <version>5.3.20</version>
28     </dependency>
29     <dependency>
30         <groupId>org.aspectj</groupId>
31         <artifactId>aspectjweaver</artifactId>
32         <version>1.9.2</version>
33     </dependency>
34     <dependency>
35         <groupId>org.mybatis</groupId>
36         <artifactId>mybatis-spring</artifactId>
37         <version>2.0.7</version>
38     </dependency>
39 </dependencies>
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12.1、回忆mybatis

1.编写实体类

2.编写核心配置文件

3.编写接口

4.编写Mapper.xml

5.测试

12.2、Mybatis-spring

法一：

 

 

User

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 1 package com.xing.pojo;
 2 
 3 public class User {
 4     private int id;
 5     private String name;
 6     private String pwd;
 7 
 8     public User() {
 9     }
10 
11     public User(int id, String name, String pwd) {
12         this.id = id;
13         this.name = name;
14         this.pwd = pwd;
15     }
16 
17     public int getId() {
18         return id;
19     }
20 
21     public void setId(int id) {
22         this.id = id;
23     }
24 
25     public String getName() {
26         return name;
27     }
28 
29     public void setName(String name) {
30         this.name = name;
31     }
32 
33     public String getPwd() {
34         return pwd;
35     }
36 
37     public void setPwd(String pwd) {
38         this.pwd = pwd;
39     }
40 
41     @Override
42     public String toString() {
43         return "User{" +
44                 "id=" + id +
45                 ", name='" + name + '\'' +
46                 ", pwd='" + pwd + '\'' +
47                 '}';
48     }
49 }
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UserMapper

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1 package com.xing.mapper;
2 
3 import com.xing.pojo.User;
4 
5 import java.util.List;
6 
7 public interface UserMapper {
8     List<User> selectUser();
9 }
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UserMapper.xml

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 1 <?xml version="1.0" encoding="UTF-8" ?>
 2 <!DOCTYPE mapper
 3         PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
 4         "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
 5 
 6 <mapper namespace="com.xing.mapper.UserMapper">
 7 
 8     <select id="selectUser" resultType="user">
 9         select * from mybatis.user;
10     </select>
11 </mapper>
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mybatis-config.xml

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 1 <?xml version="1.0" encoding="UTF-8" ?>
 2 <!DOCTYPE configuration
 3         PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
 4         "http://mybatis.org/dtd/mybatis-3-config.dtd">
 5 <!--configuration核心配置文件-->
 6 <configuration>
 7 
 8     <!--体类起别名：它的默认别名就为这个类的类名，首字母小写!-->
 9     <typeAliases>
10         <package name="com.xing.pojo"/>
11     </typeAliases>
12 
13 <!--    <mappers>-->
14 <!--        <mapper class="com.xing.mapper.UserMapper"/>-->
15 <!--    </mappers>-->
16 </configuration>
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spring-dao.xml

数据库配置文件

1.编写数据源配置

2.sqlSessionFactory

3.sqlSessionTemplate

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 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <beans xmlns="http://www.springframework.org/schema/beans"
 3        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 4        xsi:schemaLocation="http://www.springframework.org/schema/beans
 5         https://www.springframework.org/schema/beans/spring-beans.xsd">
 6 
 7     <!--DataSource:使用Spring的数据源替换Mybatis的配置
 8     我们这里使用Spring提供的JDBC:org.springframework.jdbc.datasource
 9     -->
10     <bean id="datasource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
11         <property name="driverClassName" value="com.mysql.jdbc.Driver"/>
12         <property name="url" value="jdbc:mysql://localhost:3306/mybatis?useSSL=true&amp;useUnicode=true&amp;characterEncoding=UTF-8"/>
13         <property name="username" value="root"/>
14         <property name="password" value="123456"/>
15     </bean>
16 
17     <!--sqLSessionFactory-->
18     <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
19                                          注入上面的数据源
20         <property name="dataSource" ref="datasource"/>
21 
22         <!--绑定mybatis配置文件  可以不用写mybatis配置文件,因为可以在这里配置,例如下面配置的mapper-->
23         <property name="configLocation" value="classpath:mybatis-config.xml"/>
24 
25 
26         <!--等价于mybatis配置文件中的
27         <mappers>
28             <mapper class="com.xing.mapper.UserMapper"/>
29         </mappers>
30         -->
31         <property name="mapperLocations" value="classpath:com/xing/mapper/*.xml"/>
32     </bean>
33 
34     <!--sqLsessionTemplate:就是我们使用的sqLsession-->
35     <bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate">
36         <!--只能使用构造器注入sqlSessionFactory,因为没有set方法        -->
37         <constructor-arg index="0" ref="sqlSessionFactory"/>
38     </bean>
39 
40 </beans>
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UserMapperImpl

4.需要给接口加实现类

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 1 package com.xing.mapper;
 2 
 3 import com.xing.pojo.User;
 4 import org.mybatis.spring.SqlSessionTemplate;
 5 
 6 import java.util.List;
 7 
 8 public class UserMapperImpl implements UserMapper{
 9 
10     //我们的所有操作，在原来都使用sqLSession来执行，现在都是用SqLSessionTemplate
11     private SqlSessionTemplate sqlSession;
12 
13     //spring万物都要注入,所以要set方法
14     public void setSqlSession(SqlSessionTemplate sqlSession) {
15         this.sqlSession = sqlSession;
16     }
17 
18 
19     @Override
20     public List<User> selectUser() {
21         UserMapper mapper = sqlSession.getMapper(UserMapper.class);
22         return mapper.selectUser();
23     }
24 }
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applicationContext.xml

5.将自己写的实现类，注入到Spring中

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 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <beans xmlns="http://www.springframework.org/schema/beans"
 3        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 4        xsi:schemaLocation="http://www.springframework.org/schema/beans
 5         https://www.springframework.org/schema/beans/spring-beans.xsd">
 6 
 7     <import resource="spring-dao.xml"/>
 8 
 9     <!--    将实现类注入到spring-->
10     <bean id="userMapper" class="com.xing.mapper.UserMapperImpl">
11         <!--                                调用上面(在spring-dao.xml中)的bean-->
12         <property name="sqlSession" ref="sqlSession"/>
13     </bean>
14 
15 </beans>
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MyTest

6.测试使用

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 1 import com.xing.mapper.UserMapper;
 2 import com.xing.pojo.User;
 3 import org.junit.Test;
 4 import org.springframework.context.ApplicationContext;
 5 import org.springframework.context.annotation.AnnotationConfigApplicationContext;
 6 import org.springframework.context.support.ClassPathXmlApplicationContext;
 7 
 8 import java.util.List;
 9 
10 public class MyTest {
11     @Test
12     public void test() {
13         ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
14         UserMapper mapper = context.getBean("userMapper", UserMapper.class);
15         List<User> userList = mapper.selectUser();
16         for (User user : userList) {
17             System.out.println(user);
18         }
19     }
20 
21 
22 }
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法二：

UserMapperImpl2

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 1 package com.xing.mapper;
 2 
 3 import com.xing.pojo.User;
 4 import org.apache.ibatis.session.SqlSession;
 5 import org.mybatis.spring.support.SqlSessionDaoSupport;
 6 
 7 import java.util.List;
 8 //简化了方法一实现类的操作
 9 
10 //继承一个类SqlSessionDaoSupport
11 //SqlSessionDaoSupport是一个抽象的支持类，用来为你提供 SqlSession。调用getsqlsession()方法你会得到一个SqlSessionTemplate，之后可以用于执行SQL方法
12 public class UserMapperImpl2 extends SqlSessionDaoSupport implements UserMapper{
13     @Override
14     public List<User> selectUser() {
15         SqlSession sqlSession = getSqlSession();
16         UserMapper mapper = sqlSession.getMapper(UserMapper.class);
17         return mapper.selectUser();
18     }
19 }
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spring-dao.xml

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 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <beans xmlns="http://www.springframework.org/schema/beans"
 3        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 4        xsi:schemaLocation="http://www.springframework.org/schema/beans
 5         https://www.springframework.org/schema/beans/spring-beans.xsd">
 6 
 7     <bean id="datasource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
 8         <property name="driverClassName" value="com.mysql.jdbc.Driver"/>
 9         <property name="url" value="jdbc:mysql://localhost:3306/mybatis?useSSL=true&amp;useUnicode=true&amp;characterEncoding=UTF-8"/>
10         <property name="username" value="root"/>
11         <property name="password" value="123456"/>
12     </bean>
13 
14     <!--sqLSessionFactory-->
15     <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
16         <property name="dataSource" ref="datasource"/>
17 
18         <property name="configLocation" value="classpath:mybatis-config.xml"/>
19         <property name="mapperLocations" value="classpath:com/xing/mapper/*.xml"/>
20     </bean>
21 
22 
23 </beans>
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applicationContext.xml

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 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <beans xmlns="http://www.springframework.org/schema/beans"
 3        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 4        xsi:schemaLocation="http://www.springframework.org/schema/beans
 5         https://www.springframework.org/schema/beans/spring-beans.xsd">
 6 
 7     <import resource="spring-dao.xml"/>
 8 
 9     <!--    将实现类注入到spring  -->
10     <bean id="userMapper2" class="com.xing.mapper.UserMapperImpl2">
11         <!--相当于简化了spring-dao  sqLsessionTemplate的bean配置       -->
12         <property name="sqlSessionFactory" ref="sqlSessionFactory"/>
13     </bean>
14 
15 </beans>
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test

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 1 import com.xing.mapper.UserMapper;
 2 import com.xing.pojo.User;
 3 import org.junit.Test;
 4 import org.springframework.context.ApplicationContext;
 5 import org.springframework.context.annotation.AnnotationConfigApplicationContext;
 6 import org.springframework.context.support.ClassPathXmlApplicationContext;
 7 
 8 import java.util.List;
 9 
10 public class MyTest {
11     @Test
12     public void test() {
13         ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
14         UserMapper mapper = context.getBean("userMapper2", UserMapper.class);
15         List<User> userList = mapper.selectUser();
16         for (User user : userList) {
17             System.out.println(user);
18         }
19     }
20 }
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posted @   暴躁C语言  阅读(33)  评论(0)  编辑  收藏  举报
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