一、為什麼需要多資料源
在項目中,可能會出現需要查詢不同資料庫的表的情況,是以這就需要配置多資料源。原則上可以配置無數個資料源,但是需要硬體的支援(記憶體等)。
二、整合多資料源的兩種方式
- 分包,根據不同的業務劃分不同包名作為區分
- 根據注解的方式,自定義注解
三、具體實作
本人才疏學淺,這裡就先實作第一種方式——分包,開發以及技術版本環境:eclipse、springboot2.0、jdk1.8
1.項目結構
根據不同的業務,我這裡劃分test01、test02兩個包
2.資料庫設計
3.pom檔案依賴
<dependencies>
<!-- jdbcTemplate 依賴 -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
<!-- mysql 依賴 -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>1.1.1</version>
</dependency>
<!-- 測試 -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<!-- springboot-web元件 -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!-- Lombok插件 -->
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
</dependency>
</dependencies>
4.配置檔案中新增兩個資料源
在配置檔案中自定義資料源,spring.datasource.test1.****、spring.datasource.test2.****、前半段是自定義的
###datasource1
spring.datasource.test1.driver-class-name = com.mysql.jdbc.Driver
spring.datasource.test1.jdbc-url = jdbc:mysql://localhost:3306/test01?useUnicode=true&characterEncoding=utf-8
spring.datasource.test1.username = root
spring.datasource.test1.password = root
###datasource2
spring.datasource.test2.driver-class-name = com.mysql.jdbc.Driver
spring.datasource.test2.jdbc-url = jdbc:mysql://localhost:3306/test02?useUnicode=true&characterEncoding=utf-8
spring.datasource.test2.username = root
spring.datasource.test2.password = root
5.配置資料源
因為在配置檔案中定義了兩個資料源,但是spring boot是無法識别的,是以就需要寫兩個配置檔案去配置資料源的相關内容
DataSource1Config.java
package com.zhu.dataSource;
import javax.sql.DataSource;
import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.SqlSessionTemplate;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.jdbc.DataSourceBuilder;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;
//DataSource01
@Configuration // 注冊到springboot容器中
@MapperScan(basePackages = "com.zhu.test01.mapper", sqlSessionFactoryRef = "test1SqlSessionFactory")//basePackages的位址要寫全
public class DataSource1Config {
/**
* 功能描述:(配置test1資料庫)
* @return
*/
@Bean(name = "test1DataSource")
@ConfigurationProperties(prefix = "spring.datasource.test1")
@Primary
public DataSource testDataSource() {
return DataSourceBuilder.create().build();
}
/**
* 功能描述:(test1 sql會話工廠)
* @param dataSource
* @return
* @throws Exception
*/
@Bean(name = "test1SqlSessionFactory")
@Primary
public SqlSessionFactory testSqlSessionFactory(@Qualifier("test1DataSource") DataSource dataSource)
throws Exception {
SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
bean.setDataSource(dataSource);
// bean.setMapperLocations(
// new
// PathMatchingResourcePatternResolver().getResources("classpath:mybatis/mapper/test1/*.xml"));
return bean.getObject();
}
/**
* 功能描述:(test1 事物管理)
* @param dataSource
* @return
*/
@Bean(name = "test1TransactionManager")
@Primary
public DataSourceTransactionManager testTransactionManager(@Qualifier("test1DataSource") DataSource dataSource) {
return new DataSourceTransactionManager(dataSource);
}
@Bean(name = "test1SqlSessionTemplate")
@Primary
public SqlSessionTemplate testSqlSessionTemplate(
@Qualifier("test1SqlSessionFactory") SqlSessionFactory sqlSessionFactory) throws Exception {
return new SqlSessionTemplate(sqlSessionFactory);
}
}
DataSource2Config.jave
package com.zhu.dataSource;
import javax.sql.DataSource;
import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.SqlSessionTemplate;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.jdbc.DataSourceBuilder;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;
//DataSource2
@Configuration // 注冊到springboot容器中
@MapperScan(basePackages = "com.zhu.test02.mapper", sqlSessionFactoryRef = "test2SqlSessionFactory")
public class DataSource2Config {
/**
* 功能描述:(配置test2資料庫)
* @return
*/
@Bean(name = "test2DataSource")
@ConfigurationProperties(prefix = "spring.datasource.test2")
public DataSource testDataSource() {
return DataSourceBuilder.create().build();
}
/**
* 功能描述:(test2 sql會話工廠)
* @param dataSource
* @return
* @throws Exception
*/
@Bean(name = "test2SqlSessionFactory")
public SqlSessionFactory testSqlSessionFactory(@Qualifier("test2DataSource") DataSource dataSource)
throws Exception {
SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
bean.setDataSource(dataSource);
// bean.setMapperLocations(
// new
// PathMatchingResourcePatternResolver().getResources("classpath:mybatis/mapper/test1/*.xml"));
return bean.getObject();
}
/**
* 功能描述:(test2 事物管理)
* @param dataSource
* @return
*/
@Bean(name = "test2TransactionManager")
public DataSourceTransactionManager testTransactionManager(@Qualifier("test2DataSource") DataSource dataSource) {
return new DataSourceTransactionManager(dataSource);
}
@Bean(name = "test2SqlSessionTemplate")
public SqlSessionTemplate testSqlSessionTemplate(
@Qualifier("test2SqlSessionFactory") SqlSessionFactory sqlSessionFactory) throws Exception {
return new SqlSessionTemplate(sqlSessionFactory);
}
}
@Primary:指定主資料源,spring boot2.0以下版本必須加上這個注解,否則會報錯,2.0可以不需要指定
@MapperScan(basePackages = "com.zhu.test01.mapper", sqlSessionFactoryRef = "test1SqlSessionFactory")
@MapperScan(basePackages = "com.zhu.test02.mapper", sqlSessionFactoryRef = "test2SqlSessionFactory")
包掃描,告訴spring boot我們的mapper層的位置。
6.spring boot整合多資料源demo下載下傳
https://download.csdn.net/download/qq_22774179/11504826