創建SpringBoot項目就不說了。(直接使用IDEA創建就好了)

整個目錄結構如圖：（不用管圖中報錯，項目是在另一臺電腦上寫的。報錯是沒有jar包，因為網絡比較慢。）

1、主要pom.xml

<dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><!-- Spring Boot Test 依賴 --><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope></dependency><!-- Spring Boot Mybatis 依賴 --><dependency><groupId>org.mybatis.spring.boot</groupId><artifactId>mybatis-spring-boot-starter</artifactId><version>1.2.0</version></dependency> <!-- MySQL 連接驅動依賴 --><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>${mysql-connector}</version></dependency> <!-- Druid 數據連接池依賴 --><dependency><groupId>com.alibaba</groupId><artifactId>druid</artifactId><version>1.0.18</version></dependency><dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>3.8.1</version><scope>test</scope></dependency><dependency><groupId>com.microsoft.sqlserver</groupId><artifactId>mssql-jdbc</artifactId><version>7.0.0.jre8</version></dependency></dependencies>

2、在配置文件中配置多數據源application.properties

## 默認的數據源 master.datasource.url=jdbc:mysql://localhost:3306/springbootdb?useUnicode=true&characterEncoding=utf8&allowMultiQueries=true master.datasource.username=root master.datasource.password=admin master.datasource.driverClassName=com.mysql.jdbc.Driver ## 另一個的數據源 cluster.datasource.url=jdbc:sqlserver://localhost:1433;DatabaseName=tablename cluster.datasource.username=sa cluster.datasource.password=admin cluster.datasource.driverClassName=com.microsoft.sqlserver.jdbc.SQLServerDriver

?我這配置SqlServer、MySql，如果需要連接MySql中的兩個數據庫。請自行更更改配置，并刪除pom依賴。

3、配置mapper接口的數據源

MasterDataSourceConfig.java

package com.wzq.datasource2.config;import javax.sql.DataSource;import com.alibaba.druid.pool.DruidDataSource; import org.apache.ibatis.session.SqlSessionFactory; import org.mybatis.spring.SqlSessionFactoryBean; import org.mybatis.spring.annotation.MapperScan; import org.springframework.beans.factory.annotation.Qualifier; import org.springframework.beans.factory.annotation.Value; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.context.annotation.Primary; import org.springframework.core.io.support.PathMatchingResourcePatternResolver; import org.springframework.jdbc.datasource.DataSourceTransactionManager;@Configuration //掃描 Mapper 接口并容器管理 @MapperScan(basePackages = {"com.wzq.datasource2.mapper.master"}, sqlSessionFactoryRef = "masterSqlSessionFactory") public class MasterDataSourceConfig {// 精確到 master 目錄，以便跟其他數據源隔離static final String PACKAGE = "com.wzq.datasource2.mapper.master";static final String MAPPER_LOCATION = "classpath:mapper/master/*.xml";@Value("${master.datasource.url}")private String url;@Value("${master.datasource.username}")private String user;@Value("${master.datasource.password}")private String password;@Value("${master.datasource.driverClassName}")private String driverClass;@Primary@Bean(name = "masterDataSource")public DataSource masterDataSource() {DruidDataSource dataSource = new DruidDataSource();dataSource.setDriverClassName(driverClass);dataSource.setUrl(url);dataSource.setUsername(user);dataSource.setPassword(password);return dataSource;}@Bean(name = "masterTransactionManager")@Primarypublic DataSourceTransactionManager masterTransactionManager() {return new DataSourceTransactionManager(masterDataSource());}@Bean(name = "masterSqlSessionFactory")@Primarypublic SqlSessionFactory masterSqlSessionFactory(@Qualifier("masterDataSource") DataSource masterDataSource)throws Exception {final SqlSessionFactoryBean sessionFactory = new SqlSessionFactoryBean();sessionFactory.setDataSource(masterDataSource);sessionFactory.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath:mapper/master/*.xml"));return sessionFactory.getObject();} }

4、創建entity實體類

public class StuT {private static final long serialVersionUID = 1L;private Integer id;private String name;//get/set}public class Stu {private static final long serialVersionUID = 1L;private Integer id;private String name;//get/set } ClusterDataSourceConfig.java package com.wzq.datasource2.config;import javax.sql.DataSource; import org.apache.ibatis.session.SqlSessionFactory; import org.mybatis.spring.SqlSessionFactoryBean; import org.mybatis.spring.annotation.MapperScan; import org.springframework.beans.factory.annotation.Qualifier; import org.springframework.beans.factory.annotation.Value; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.core.io.support.PathMatchingResourcePatternResolver; import org.springframework.jdbc.datasource.DataSourceTransactionManager;import com.alibaba.druid.pool.DruidDataSource;@Configuration //掃描 Mapper 接口并容器管理 @MapperScan(basePackages = {"com.wzq.datasource2.mapper.cluster"}, sqlSessionFactoryRef = "clusterSqlSessionFactory") public class ClusterDataSourceConfig {// 精確到 cluster 目錄，以便跟其他數據源隔離static final String PACKAGE = "com.wzq.datasource2.mapper.cluster";static final String MAPPER_LOCATION = "classpath:mapper/cluster/*.xml";@Value("${cluster.datasource.url}")private String url;@Value("${cluster.datasource.username}")private String user;@Value("${cluster.datasource.password}")private String password;@Value("${cluster.datasource.driverClassName}")private String driverClass;@Bean(name = "clusterDataSource")public DataSource clusterDataSource() {DruidDataSource dataSource = new DruidDataSource();dataSource.setDriverClassName(driverClass);dataSource.setUrl(url);dataSource.setUsername(user);dataSource.setPassword(password);return dataSource;}@Bean(name = "clusterTransactionManager")public DataSourceTransactionManager clusterTransactionManager() {return new DataSourceTransactionManager(clusterDataSource());}@Bean(name = "clusterSqlSessionFactory")public SqlSessionFactory clusterSqlSessionFactory(@Qualifier("clusterDataSource") DataSource clusterDataSource)throws Exception {final SqlSessionFactoryBean sessionFactory = new SqlSessionFactoryBean();sessionFactory.setDataSource(clusterDataSource);sessionFactory.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath:mapper/cluster/*.xml"));return sessionFactory.getObject();} }

請根據實體類自行創建表?

5、編寫mapper層

?

?

6、Service省略，目錄結構如下：

?7、controller層

package com.wzq.datasource2.controller;import com.wzq.datasource2.entity.cluster.StuT; import com.wzq.datasource2.entity.master.Stu; import com.wzq.datasource2.service.cluster.StuTService; import com.wzq.datasource2.service.master.StuService; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.beans.factory.annotation.Qualifier; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.ResponseBody;import java.util.List;@Controller public class StuController {@Autowired@Qualifier(value = "stuServiceImpl")private StuService stuService;@Autowired@Qualifier(value = "stuTServiceImpl")private StuTService stuTService;@RequestMapping("/list")@ResponseBodypublic List<Stu> getAllStu(){return stuService.getAllStu();}@RequestMapping("/list2")@ResponseBodypublic List<StuT> getAllStuT(){return stuTService.getAllStuT();}}

總結：

1、配置多數據的目的是因為新項目需要用到老項目中的數據，而數據存放在兩個不同的數據庫當中，配置多數據源能很好的解決這一方面。還有一些公司進行了分庫的操作，就比如一個制作增刪改，一個制作查詢。

2、?可能是我在配置數據源的時候使用了master或cluster，亦或者在配置mapper接口的數據源時指定的mastter或cluster，所以需要在mapperwen文件下創建master和cluster文件，以此來區分數據源的使用。

PS:報紅是因為沒有jar包！報紅是因為沒有jar包！報紅是因為沒有jar包！

GitHub網址：https://github.com/qz596766829/WzqRepository.git?(datasoutrce2項目)

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