Spring學習筆記-Spring整合Mybatis
阿新 • • 發佈:2021-08-13
建立專案&搭建環境
匯入依賴(jar包)
- junit
- mybatis
- mysql資料庫
- spring相關
- aop織入
- mybatis-spring【叮!獲得新知識點】
<dependencies> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.13</version> <scope>test</scope> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>8.0.22</version> </dependency> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis</artifactId> <version>3.5.7</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-webmvc</artifactId> <version>5.3.9</version> </dependency> <!--Spring操作資料庫--> <!-- https://mvnrepository.com/artifact/org.springframework/spring-jdbc --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-jdbc</artifactId> <version>5.3.9</version> </dependency> <!--AOP織入--> <dependency> <groupId>org.aspectj</groupId> <artifactId>aspectjrt</artifactId> <version>1.8.14</version> </dependency> <dependency> <groupId>org.aspectj</groupId> <artifactId>aspectjweaver</artifactId> <version>1.8.14</version> </dependency> <!-- https://mvnrepository.com/artifact/org.mybatis/mybatis-spring --> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis-spring</artifactId> <version>2.0.6</version> </dependency> </dependencies>
編寫實體類(資料庫資料略)
package cn.iris.pojo; /** * @author Iris 2021/8/13 */ public class User { private int id; private String name; private String pwd; public User() { } public User(int id, String name, String pwd) { this.id = id; this.name = name; this.pwd = pwd; } public int getId() { return id; } public void setId(int id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public String getPwd() { return pwd; } public void setPwd(String pwd) { this.pwd = pwd; } @Override public String toString() { return "User{" + "id=" + id + ", name='" + name + '\'' + ", pwd='" + pwd + '\'' + '}'; } }
編寫interface UserMapper(略)&UserMapper.xml
<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd"> <mapper namespace="cn.iris.mapper.UserMapper"> <select id="selectUser" resultType="User"> SELECT * FROM user; </select> </mapper>
編寫配置檔案【mybatis-config】
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
<properties resource="db.properties"/>
<typeAliases>
<package name="cn.iris.pojo"/>
</typeAliases>
<environments default="mybatis">
<environment id="mybatis">
<transactionManager type="JDBC"/><!-- 單獨使用時配置成MANAGED沒有事務 -->
<dataSource type="POOLED">
<property name="driver" value="${driver}"/>
<property name="url" value="${url}"/>
<property name="username" value="${username}"/>
<property name="password" value="${password}"/>
</dataSource>
</environment>
</environments>
<mappers>
<mapper class="cn.iris.mapper.UserMapper"/>
</mappers>
</configuration>
【tip】解決資源掃描問題
在pom.xml檔案中加入以下語句
<build>
<resources>
<resource>
<directory>src/main/java</directory>
<includes>
<include>**/*.properties</include>
<include>**/*.xml</include>
</includes>
<filtering>false</filtering>
</resource>
<!-- 由於修改了預設的resource目錄,導致src/main/resources的所有檔案都不能被掃描,因此還要配多一個 -->
<resource>
<directory>src/main/resources</directory>
<includes>
<include>**/*.properties</include>
<include>**/*.xml</include>
</includes>
<filtering>false</filtering>
</resource>
</resources>
</build>
整合Spring方式一
由Spring接管Myabtis業務
- 【spring-mapper.xml】:負責Mybatis的mapper註冊,資料庫連線以及sqlSession的建立(使用Spring的SqlSessionTemplate)
<?xml version="1.0" encoding="UTF-8"?>
<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 class="cn.iris.pojo.User"/>
<!--Datasource 使用Spring的資料來源替換Mybatis的配置-->
<bean id="datasource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="com.mysql.cj.jdbc.Driver"/>
<property name="url" value="jdbc:mysql://localhost:3306/mybatis?useSSL=false&allowPublicKeyRetrieval=true&serverTimezone=Asia/Shanghai"/>
<property name="username" value="root"/>
<property name="password" value="123456"/>
</bean>
<!--SqlSessionFactory-->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="datasource"/>
<!--繫結mybatis-config+mapper-->
<property name="configLocation" value="classpath:mybatis-config.xml"/>
<property name="mapperLocations" value="cn/iris/mapper/UserMapper.xml"/>
</bean>
<!--SqlSessionTemplate 等同於SqlSessionFactory-->
<bean id="sqlSessionTemplate" class="org.mybatis.spring.SqlSessionTemplate">
<!--只能使用構造器注入sqlSessionFactory(沒有Setter)-->
<constructor-arg index="0" ref="sqlSessionFactory"/>
</bean>
<!---->
<bean id="userMapper" class="cn.iris.mapper.UserMapperImpl">
<property name="sqlSession" ref="sqlSessionTemplate"/>
</bean>
</beans>
- 【applicationConfig.xml】:Spring全域性配置
<?xml version="1.0" encoding="UTF-8"?>
<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">
<import resource="spring-mapper.xml"/>
</beans>
- 【mybatis-config.xml】:由Spring接管後,只需保留別名設定以及部分核心設定(日誌、駝峰命名...)內容
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
<typeAliases>
<package name="cn.iris.pojo"/>
</typeAliases>
<!-- <settings>-->
<!-- <setting name="" value=""/>-->
<!-- </settings>-->
</configuration>
- 【Class UsermapperImpl】:繼承InterFace UserMapper,完成SQlSessionTemplate執行sql操作
package cn.iris.mapper;
import cn.iris.pojo.User;
import org.mybatis.spring.SqlSessionTemplate;
import java.util.List;
/**
* @author Iris 2021/8/13
*/
public class UserMapperImpl implements UserMapper{
// 之前:所有操作都用SQLSession執行
// 現在:都由SqlSessionTemplate執行
private SqlSessionTemplate sqlSession;
public void setSqlSession(SqlSessionTemplate sqlSession) {
this.sqlSession = sqlSession;
}
@Override
public List<User> selectUser() {
UserMapper mapper = sqlSession.getMapper(UserMapper.class);
return mapper.selectUser();
}
}
【測試】
@Test
public void selectUser() throws IOException {
ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("spring-mapper.xml");
UserMapper userMapper = context.getBean("userMapper", UserMapper.class);
List<User> users = userMapper.selectUser();
for ( User user : users) {
System.out.println(user);
}
}
}
整合Spring方式二
【SqlSessionDaoSupport(Spring5.2及以上版本支援)】
- Class UserMapperImp2
package cn.iris.mapper;
import cn.iris.pojo.User;
import org.mybatis.spring.support.SqlSessionDaoSupport;
import java.util.List;
/**
* @author Iris 2021/8/13
*/
public class UserMapperImpl2 extends SqlSessionDaoSupport implements UserMapper{
@Override
public List<User> selectUser() {
return getSqlSession().getMapper(UserMapper.class).selectUser();
}
}
- 在applicationConfig.xml中註冊Bean
<bean id="userMapper2" class="cn.iris.mapper.UserMapperImpl2">
<property name="sqlSessionFactory" ref="sqlSessionFactory"/>
</bean>
- 測試
@Test
public void selectUser() throws IOException {
ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("applicationConfig.xml");
UserMapper userMapper = context.getBean("userMapper2", UserMapper.class);
List<User> users = userMapper.selectUser();
for ( User user : users) {
System.out.println(user);
}
}