SpringBoot2.0之八 多資料來源配置
阿新 • • 發佈:2019-02-18
在開發的過程中我們可能都會遇到對接公司其他系統等需求,對於外部的系統可以採用介面對接的方式,對於一個公司開發的兩個系統,並且知道相關資料庫結構的情況下,就可以考慮使用多資料來源來解決這個問題。SpringBoot為我們提供了相對簡單的實現。
一、建立如下結構的maven專案
二、新增相關資料庫配置資訊
server:
port: 8080
spring:
datasource:
master:
driver-class-name: com.mysql.jdbc.Driver
url: jdbc:mysql://127.0.0.1:3306/test ?useUnicode=true&characterEncoding=utf-8&useSSL=false
username: root
password: 123456
slaver:
driver-class-name: com.mysql.jdbc.Driver
url: jdbc:mysql://127.0.0.1:3306/dev?useUnicode=true&characterEncoding=utf-8&useSSL=false
username: root
password: 123456
三、主庫和從庫的相關配置
1、主庫資料來源配置
@Configuration
@MapperScan(basePackages = "com.somta.springboot.dao.master", sqlSessionTemplateRef = "masterSqlSessionTemplate")
public class MasterDataSourceConfiguration {
@Value("${spring.datasource.master.driver-class-name}")
private String driverClassName;
@Value ("${spring.datasource.master.url}")
private String url;
@Value("${spring.datasource.master.username}")
private String username;
@Value("${spring.datasource.master.password}")
private String password;
@Bean(name = "masterDataSource")
@Primary
public DataSource dataSource() {
DruidDataSource dataSource = new DruidDataSource();
dataSource.setDriverClassName(this.driverClassName);
dataSource.setUrl(this.url);
dataSource.setUsername(this.username);
dataSource.setPassword(this.password);
return dataSource;
}
@Bean(name = "masterSqlSessionFactory")
@Primary
public SqlSessionFactory sqlSessionFactory(@Qualifier("masterDataSource") DataSource dataSource) throws Exception {
SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
bean.setDataSource(dataSource);
bean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath*:mybatis/master/**/Mysql_*Mapper.xml"));
return bean.getObject();
}
@Bean(name = "masterTransactionManager")
@Primary
public DataSourceTransactionManager transactionManager(@Qualifier("masterDataSource") DataSource dataSource) {
return new DataSourceTransactionManager(dataSource);
}
@Bean(name = "masterSqlSessionTemplate")
@Primary
public SqlSessionTemplate sqlSessionTemplate(@Qualifier("masterSqlSessionFactory") SqlSessionFactory sqlSessionFactory) throws Exception {
return new SqlSessionTemplate(sqlSessionFactory);
}
}
2、從庫的資料來源配置資訊
@Configuration
@MapperScan(basePackages = "com.somta.springboot.dao.slaver", sqlSessionTemplateRef = "slaverSqlSessionTemplate")
public class SlaverDataSourceConfiguration {
@Value("${spring.datasource.slaver.driver-class-name}")
private String driverClassName;
@Value("${spring.datasource.slaver.url}")
private String url;
@Value("${spring.datasource.slaver.username}")
private String username;
@Value("${spring.datasource.slaver.password}")
private String password;
@Bean(name = "slaverDataSource")
public DataSource dataSource() {
DruidDataSource dataSource = new DruidDataSource();
dataSource.setDriverClassName(this.driverClassName);
dataSource.setUrl(this.url);
dataSource.setUsername(this.username);
dataSource.setPassword(this.password);
return dataSource;
}
@Bean(name = "slaverSqlSessionFactory")
public SqlSessionFactory sqlSessionFactory(@Qualifier("slaverDataSource") DataSource dataSource) throws Exception {
SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
bean.setDataSource(dataSource);
bean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath*:mybatis/slaver/**/Mysql_*Mapper.xml"));
return bean.getObject();
}
@Bean(name = "slaverTransactionManager")
public DataSourceTransactionManager transactionManager(@Qualifier("slaverDataSource") DataSource dataSource) {
return new DataSourceTransactionManager(dataSource);
}
@Bean(name = "slaverSqlSessionTemplate")
public SqlSessionTemplate sqlSessionTemplate(@Qualifier("slaverSqlSessionFactory") SqlSessionFactory sqlSessionFactory) throws Exception {
return new SqlSessionTemplate(sqlSessionFactory);
}
}
注意在配置資料來源的資訊時,一定要通過@Primary配置一個主庫,對於資料庫配置部分與普通的資料來源配置沒有差異,新建一個DataSource,在建立一個SqlSessionTemplate,最後建立一個SqlSessionTemplate,分別以此注入即可,@MapperScan註解的掃描路徑要分別對於相應的dao層
四、編寫dao層和xml
public interface UserMasterDao {
int addUser(User user);
int deleteUserById(Long id);
int updateUserById(User user);
User queryUserById(Long id);
List<User> queryUserList();
}
<?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="com.somta.springboot.dao.master.UserMasterDao" >
<!-- Result Map-->
<resultMap id="BaseResultMap" type="com.somta.springboot.pojo.User" >
<result column="id" property="id"/>
<result column="name" property="name"/>
<result column="age" property="age"/>
</resultMap>
<!-- th_role_user table all fields -->
<sql id="Base_Column_List" >
id, name, age
</sql>
<insert id="addUser" parameterType="com.somta.springboot.pojo.User" >
insert into t_user (id, name, age)
values (#{id},#{name},#{age});
</insert>
<delete id="deleteUserById" parameterType="java.lang.Long">
delete from t_user where id=#{id}
</delete>
<update id="updateUserById" parameterType="com.somta.springboot.pojo.User" >
update t_user set
<trim suffixOverrides="," >
<if test="id != null and id != ''">
id=#{id},
</if>
<if test="name != null and name != ''">
name=#{name},
</if>
<if test="age != null and age != ''">
age=#{age},
</if>
</trim> where id=#{id}
</update>
<select id="queryUserById" resultMap="BaseResultMap" parameterType="java.lang.Long">
select <include refid="Base_Column_List" />
from t_user where id = #{id}
</select>
<select id="queryUserList" resultMap="BaseResultMap">
select <include refid="Base_Column_List" />
from t_user
</select>
</mapper>
五、編寫測試類進行測試
@RunWith(SpringJUnit4ClassRunner.class)
@SpringBootTest(classes = Application.class)
public class MultiDatasourceTest {
@Autowired
private UserMasterDao masterUserDao;
@Autowired
private UserSlaverDao slaverUserDao;
/**
* 查詢使用者
* @throws Exception
*/
@Test
public void testQueryUser() throws Exception {
User masterUser = masterUserDao.queryUserById(1L);
System.out.println("masterUser==>"+masterUser.getName());
User slaverUser = slaverUserDao.queryUserById(1L);
System.out.println("slaverUser==>"+slaverUser.getName());
}
}
當在控制檯看到如下所示輸出就代表我們的配置已經成功了
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