SpringBoot+MyBatis配置两种数据源

技术2022-07-10 182

SpringBoot+MyBatis配置两种数据源

前言

前段时间做项目，要配置两种数据源，以后也是会经常遇到的，下面记录一下如何用pringBoot+MyBatis配置两种数据源。公司通用数据库是postgresql和Oracle,无奈Oracle实在太大，用MySQL代替一下。

一、. 项目结构二、pom.xml 添加两种数据源的相关依赖

<dependency> <groupId>org.postgresql</groupId> <artifactId>postgresql</artifactId> <version>42.2.5</version> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>8.0.11</version> </dependency>

三、application.properties 这里也要配置两种数据源

spring.datasource.master.jdbc-url=jdbc:postgresql://39.99.... spring.datasource.master.username= spring.datasource.master.password= spring.datasource.master.driver-class-name=org.postgresql.Driver spring.datasource.slave.jdbc-url=jdbc:mysql:// ........./.......?serverTimezone=GMT&useUnicode=true&characterEncoding=utf8 spring.datasource.slave.username= spring.datasource.slave.password= spring.datasource.slave.driver-class-name=com.mysql.cj.jdbc.Driver

spring.datasource.master、spring.datasource.slave分别代表两种数据源的前缀，url要改成 jdbc-url，不然会报错： spring.datasource.url 数据库的 JDBC URL。

spring.datasource.jdbc-url 用来重写自定义连接池

官方文档的解释是：

因为连接池的实际类型没有被公开，所以在您的自定义数据源的元数据中没有生成密钥，而且在IDE中没有完成(因为DataSource接口没有暴露属性)。另外，如果您碰巧在类路径上有Hikari，那么这个基本设置就不起作用了，因为Hikari没有url属性(但是确实有一个jdbcUrl属性)。

这里是引用 https://blog.csdn.net/newbie_907486852/article/details/81391525

注意： com.mysql.jdbc.Driver 是 mysql-connector-java 5中的， com.mysql.cj.jdbc.Driver 是 mysql-connector-java 6中的

四、 ※配置类

MasterConfig

package com.appport.config; 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.core.io.support.PathMatchingResourcePatternResolver; //表示这个类为一个配置类 @Configuration //配置mybatis的接口类放的地方 @MapperScan(basePackages = "com.appport.mapperone", sqlSessionFactoryRef = "masterSqlSessionFactory") public class MasterConfig { // 将这个对象放入Spring容器中 @Bean(name = "masterDataSource") // 表示这个数据源是默认数据源 @Primary // 读取application.properties中的配置参数映射成为一个对象 // prefix表示参数的前缀 @ConfigurationProperties(prefix = "spring.datasource.master") public DataSource getDateSource1() { return DataSourceBuilder.create().build(); } @Bean(name = "masterSqlSessionFactory") // 表示这个数据源是默认数据源 @Primary // @Qualifier表示查找Spring容器中名字为masterDataSource的对象 public SqlSessionFactory masterSqlSessionFactory(@Qualifier("masterDataSource") DataSource datasource) throws Exception { SqlSessionFactoryBean bean = new SqlSessionFactoryBean(); bean.setDataSource(datasource); bean.setMapperLocations( // 设置mybatis的xml所在位置 new PathMatchingResourcePatternResolver().getResources("classpath*:mapper/one/*.xml")); /* System.out.println("dddddddddddddddddddddddddddddd"); */ return bean.getObject(); } @Bean("masterSqlSessionTemplate") // 表示这个数据源是默认数据源 @Primary public SqlSessionTemplate mastersqlsessiontemplate( @Qualifier("masterSqlSessionFactory") SqlSessionFactory sessionfactory) { return new SqlSessionTemplate(sessionfactory); } }

SlaveConfig

package com.appport.config; 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.core.io.support.PathMatchingResourcePatternResolver; @Configuration @MapperScan(basePackages = "com.appport.mappertwo", sqlSessionFactoryRef = "slaveSqlSessionFactory") public class SlaveConfig { @Bean(name = "slaveDataSource") @ConfigurationProperties(prefix = "spring.datasource.slave") public DataSource getDateSource2() { return DataSourceBuilder.create().build(); } @Bean(name = "slaveSqlSessionFactory") public SqlSessionFactory slaveSqlSessionFactory(@Qualifier("slaveDataSource") DataSource datasource) throws Exception { SqlSessionFactoryBean bean = new SqlSessionFactoryBean(); bean.setDataSource(datasource); bean.setMapperLocations( new PathMatchingResourcePatternResolver().getResources("classpath*:mapper/two/*.xml")); return bean.getObject(); } @Bean("slaveSqlSessionTemplate") public SqlSessionTemplate slavesqlsessiontemplate( @Qualifier("slaveSqlSessionFactory") SqlSessionFactory sessionfactory) { return new SqlSessionTemplate(sessionfactory); } }

五. 测试相关代码 mapper：

package com.appport.mapperone; import java.util.List; import org.apache.ibatis.annotations.Mapper; import org.springframework.stereotype.Repository; import com.appport.domain.Qyxxb; @Repository @Mapper public interface QyxxbMapper { public List<Qyxxb> SelectQymc(Qyxxb qyxxb); } package com.appport.mappertwo; import java.util.List; import org.apache.ibatis.annotations.Mapper; import org.apache.ibatis.annotations.Select; import org.springframework.stereotype.Repository; import com.appport.domain.BidwinningNotice; @Repository @Mapper public interface BidwinningNoticeMapper { public List<BidwinningNotice> selectAll(String xm_bh); }

mapper.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="com.appport.mapperone.QyxxbMapper"> <select id="SelectQymc" parameterType="java.util.Map" resultType="com.appport.domain.Qyxxb"> select * from qyxxb </select> </mapper> <?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.appport.mappertwo.BidwinningNoticeMapper"> <select id="selectAll" resultType="com.appport.domain.BidwinningNotice"> select * from bidwinningnotice where xm_bh=#{xm_bh}; </select> </mapper>

service:

package com.appport.service; import java.util.List; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; import com.appport.domain.BidwinningNotice; import com.appport.mappertwo.BidwinningNoticeMapper; @Service public class BidwinningNoticeService { //定义日志打印 private static final Logger log = LoggerFactory.getLogger(BidwinningNoticeService.class); @Autowired private BidwinningNoticeMapper bidwinningNoticeMapper; public List<BidwinningNotice> selectAll(String xm_bh){ return bidwinningNoticeMapper.selectAll(xm_bh); } } package com.appport.service; import java.util.List; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; import com.appport.domain.Qyxxb; import com.appport.mapperone.QyxxbMapper; import com.appport.service.QyxxbService; @Service public class QyxxbService { private static final Logger log = LoggerFactory.getLogger(QyxxbService.class); @Autowired private QyxxbMapper qyxxbMapper; /** * @param 查询企业信息 * */ public List<Qyxxb> SelectQymc(Qyxxb qyxxb) { List<Qyxxb> a=qyxxbMapper.SelectQymc(qyxxb); return a; } }

controller:

package com.appport.controller; import java.util.List; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController; import com.appport.domain.BidwinningNotice; import com.appport.domain.Qyxxb; import com.appport.service.BidwinningNoticeService; import com.appport.service.QyxxbService; @RestController public class NetDiskFileController { @Autowired private BidwinningNoticeService bidwinningNoticeService; @Autowired private QyxxbService qyxxbService; @RequestMapping("/selectAll") public List<BidwinningNotice> selectAll(String xm_bh){ List<BidwinningNotice> list=bidwinningNoticeService.selectAll(xm_bh); System.out.println(list); return list; } @RequestMapping("/SelectQymc") public List<Qyxxb> SelectQymc(Qyxxb qyxxb){ List<Qyxxb> list=qyxxbService.SelectQymc(qyxxb); System.out.println(list); return list; } }

六. 执行结果七. 总结百度很强大，一大堆的案例，至于我参考的哪位大牛的，很遗憾，后来怎么找也找不到了，在此谢谢大佬了。。。

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