SpringBoot多数据源（五）

SpringBoot多数据源-集成多个mybatis框架

1.基本框架
2.使用
- 2.1项目结构
- 2.2 依赖导入
- 2.3 application.yml配置
- 2.4 创建读与写的SqlSessionFactoryBean
3.总结

1.基本框架

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通过启动多个SqlSessionFactoryBean，每个SqlSessionFactoryBean对应一个datasource和指定位置的mapper.xml文件，就可以实现多个数据源了。而不用切换数据源，不用实现AbstractRoutingDataSource。

2.使用

2.1项目结构

在这里插入图片描述

2.2 依赖导入

<?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>3.2.4</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.rql</groupId>
    <artifactId>springboot-mybatis-dataSource-043</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>springboot-mybatis-dataSource-043</name>
    <description>springboot-mybatis-dataSource-043</description>
    <properties>
        <java.version>17</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jdbc</artifactId>
        </dependency>
        <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>3.0.3</version>
        </dependency>

        <dependency>
            <groupId>com.mysql</groupId>
            <artifactId>mysql-connector-j</artifactId>
            <scope>runtime</scope>
        </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>
        </dependency>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter-test</artifactId>
            <version>3.0.3</version>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
            <version>1.2.6</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <excludes>
                        <exclude>
                            <groupId>org.projectlombok</groupId>
                            <artifactId>lombok</artifactId>
                        </exclude>
                    </excludes>
                </configuration>
            </plugin>
        </plugins>
    </build>

</project>

2.3 application.yml配置

spring:
  datasource:
    datasource1:
      driver-class-name: com.mysql.cj.jdbc.Driver
      jdbc-url: jdbc:mysql://localhost:3306/test_master
      username: root
      password: root
      druid:
         initial-size: 1
         min-idle: 1
         max-active: 20
         test-on-borrow: true

    datasource2:
      driver-class-name: com.mysql.cj.jdbc.Driver
      jdbc-url: jdbc:mysql://localhost:3306/test_slave
      username: root
      password: root
      druid:
        initial-size: 1
        min-idle: 1
        max-active: 20
        test-on-borrow: true
  main:
    allow-bean-definition-overriding: true

mybatis:
  type-aliases-package: com.rql.entity

2.4 创建读与写的SqlSessionFactoryBean

RMybatisConfig.java（读）


package com.rql.config;


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.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;

import javax.sql.DataSource;

@Configuration
@MapperScan(basePackages = "com.rql.mapper.r",sqlSessionFactoryRef = "rsqlSessionFactory")
public class RMybatisConfig {

    @Bean
    @ConfigurationProperties(prefix = "spring.datasource.datasource2")
    public DataSource dataSource2(){
        return DataSourceBuilder.create().build();
    }

    @Bean
    public SqlSessionFactory rsqlSessionFactory() throws Exception {

        SqlSessionFactoryBean sqlSessionFactoryBean = new SqlSessionFactoryBean();
        sqlSessionFactoryBean.setDataSource(dataSource2());
        sqlSessionFactoryBean.setMapperLocations(new PathMatchingResourcePatternResolver()
                .getResources("classpath:mybatis/r/*.xml"));
        return sqlSessionFactoryBean.getObject();

    }
}

WMybatisConfig.java（写）

package com.rql.config;

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.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;

import javax.sql.DataSource;

@Configuration
//继承mybatis
//1.basePackages:指定扫描的mapper接口包（主库）
//2.sqlSessionFactoryRef：指定使用sqlSessionFactory是哪个
@MapperScan(basePackages = "com.rql.mapper.w",sqlSessionFactoryRef = "wsqlSessionFactory")
public class WMybatisConfig {

    @Bean
    @ConfigurationProperties(prefix = "spring.datasource.datasource1")
    public DataSource dataSource1(){
        return DataSourceBuilder.create().build();
    }

    @Bean
    @Primary
    public SqlSessionFactory wsqlSessionFactory() throws Exception {

        SqlSessionFactoryBean sqlSessionFactoryBean = new SqlSessionFactoryBean();
        sqlSessionFactoryBean.setDataSource(dataSource1());
        sqlSessionFactoryBean.setMapperLocations(new PathMatchingResourcePatternResolver()
                .getResources("classpath:mybatis/w/*.xml"));
        return sqlSessionFactoryBean.getObject();

    }
}