Lou Chen

SpringBoot整合MyBatis以及多数据源

Lou.Chen
大约 4 分钟

springboot整合Mybatis

注意：

1、mapper映射文件存放位置：
①存放在java文件夹中

当mapper映射文件存放的位置在src/mian/java中，即和mapper接口文件位置一致时。由于maven编译时会忽略配置xml文件，所以我们需要手动配置过滤其java文件夹下的xml文件即resource下的xml

<build>
       <resources>
            <resource>
                <directory>src/main/java</directory>
                <includes>
                    <include>**/*.xml</include>
                </includes>
            </resource>
            <resource>
                <directory>src/main/resources</directory>
            </resource>
        </resources>
 </build>
②存放在resources下

放在同一目录结构==>

放在resources下的文件夹要和接口中的文件夹目录结构一致。

注意：这里新建包名要一个一个建，不要想java目录中的结果一样，直接把所有的包名写在一起。

例如：接口目录 src/main/org/lc/mybatis/mapper/xxxx.java

mappes映射文件目录 resources/org/lc/mybatis/mapper/xxxx.mapper

放在不同目录结构==>

例如：resources/mapper/mybatis01/xxxx.mapper

则需要在yaml中重新指定mappe映射位置：

spring:
  datasource:
    type: com.alibaba.druid.pool.DruidDataSource
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql://127.0.0.1:3306/test?serverTimezone=Asia/Shanghai&useUnicode=true&characterEncoding=UTF-8&useSSL=false
    username: root
    password: 123456

mybatis:
 #映射resources资源目录下的mapper文件夹下的任意目录下的xml文件
  mapper-locations: classpath:/mapper/**/*.xml
2、@Mapper @MapperScan(s）

@Mapper 扫描单个mapper接口

@MapperScans({

​ @MapperScan(),

​ @MapperScan()

})

@MapperScan() 扫描指定包下的所有mapper接口，多数据源时，则需要指定对应的sqlSessionFactoryRef，sqlSessionTemplateRef

 @MapperScan(basePackages = "org.lc.mybatis.mapper.mapper1",sqlSessionFactoryRef = "sqlSessionFactoryOne",sqlSessionTemplateRef = "sqlSessionTemplateOne")
@Configuration
public class MybatisConfig {
}

单数据源配置:

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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.2.5.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>org.lc</groupId>
    <artifactId>mybatis</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>mybatis</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.1.2</version>
        </dependency>

        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
            <version>1.1.18</version>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
            <version>5.1.27</version>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>

        <resources>
            <resource>
                <directory>src/main/java</directory>
                <includes>
                    <include>**/*.xml</include>
                </includes>
            </resource>
            <resource>
                <directory>src/main/resources</directory>
            </resource>
        </resources>
    </build>
</project>

spring:
  datasource:
    type: com.alibaba.druid.pool.DruidDataSource
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql://127.0.0.1:3306/test?serverTimezone=Asia/Shanghai&useUnicode=true&characterEncoding=UTF-8&useSSL=false
    username: root
    password: 123456

Lombok插件的使用:==>

生成getter setter及 tostring

@Getter
@Setter
@ToString
public class User {
    private Integer id;
    private String username;
    private String address;
}

**@Mapper **扫描mapper注入容器中

@Mapper
public interface UserMapper {
    List<User> getAllUser();
}

<?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="org.lc.mybatis.mapper.UserMapper">
    <select id="getAllUser" resultType="org.lc.mybatis.bean.User">
        select *  from user
    </select>
</mapper>

使用==>

@SpringBootTest
class MybatisApplicationTests {

    @Autowired
    private UserMapper userMapper;

    @Test
    void contextLoads() {
        List<User> allUser = userMapper.getAllUser();
        System.out.println(allUser);
    }
}

多数据源配置:

spring:
  datasourceone:
    type: com.alibaba.druid.pool.DruidDataSource
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql://127.0.0.1:3306/test?serverTimezone=Asia/Shanghai&useUnicode=true&characterEncoding=UTF-8&useSSL=false
    username: root
    password: 123456

  datasourcetwo:
    type: com.alibaba.druid.pool.DruidDataSource
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql://47.96.141.44:3306/test?serverTimezone=Asia/Shanghai&useUnicode=true&characterEncoding=UTF-8&useSSL=false
    username: root
    password: xxxx

数据源属性注入==>

@Configuration
public class DataSourceConfig {

    @ConfigurationProperties("spring.datasourceone")
    @Bean
    public DataSource dataSourceOne(){
        return DruidDataSourceBuilder.create().build();
    }

    @ConfigurationProperties("spring.datasourcetwo")
    @Bean
    public DataSource dataSourceTwo(){
        return DruidDataSourceBuilder.create().build();
    }

}

SqlSessionFactory与SqlSessionTemplate配置==>

@MapperScans({
    	//数据源一的对应的mapper接口位置
        @MapperScan(basePackages = "org.lc.mybatis.mapper.mapper1",sqlSessionFactoryRef = "sqlSessionFactoryOne",sqlSessionTemplateRef = "sqlSessionTemplateOne"),
        //数据源二的对应的mapper接口位置
        @MapperScan(basePackages = "org.lc.mybatis.mapper.mapper2",sqlSessionFactoryRef ="sqlSessionFactoryTwo",sqlSessionTemplateRef = "sqlSessionTemplatelTwo")
})
@Configuration
public class MybatisConfig {

    /**
     * 数据源一注入
     */
    @Qualifier("dataSourceOne")
    @Autowired
    DataSource dataSourceOne;

    /**
     * 数据源二注入
     */
    @Resource(name = "dataSourceTwo")
    DataSource dataSourceTwo;

    /**
     * SqlSessionFactory 属性配置
     * @return
     */
    @Bean
    public SqlSessionFactory sqlSessionFactoryOne(){
        SqlSessionFactoryBean sqlSessionFactoryBean=new SqlSessionFactoryBean();
        sqlSessionFactoryBean.setDataSource(dataSourceOne);
        try {
            //配置在resources下的自定义mapper文件位置
            sqlSessionFactoryBean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath:mapper/mybatis01/**/*.xml"));
            return sqlSessionFactoryBean.getObject();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * SqlSessionTemplate 一模板操作配置
     * @return
     */
    @Bean
    public SqlSessionTemplate sqlSessionTemplateOne(){
        return new SqlSessionTemplate(sqlSessionFactoryOne());
    }

    @Bean
    public SqlSessionFactory sqlSessionFactoryTwo(){
        SqlSessionFactoryBean sqlSessionFactoryBean=new SqlSessionFactoryBean();
        sqlSessionFactoryBean.setDataSource(dataSourceTwo);
        try {
            //配置在resources下的自定义mapper文件位置
            sqlSessionFactoryBean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath:mapper/mybatis02/**/*.xml"));
            return sqlSessionFactoryBean.getObject();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;

    }
    @Bean
    public SqlSessionTemplate sqlSessionTemplatelTwo(){
        return new SqlSessionTemplate(sqlSessionFactoryTwo());
    }
}

同理=>

①当mapper.xml在java文件夹下，则不需要配置mapper.xml的位置

②当mapper.xml在resources自定义的文件夹下，则需要配置mapper.xml的位置

//配置在resources下的自定义mapper文件位置
            sqlSessionFactoryBean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath:mapper/mybatis02/**/*.xml")

因为多数据源的关系，所以所有在yaml的基本mybatis的配置失效，需要重新在SqlSessionFactory配置