SpringBoot- Mybatis多數據源

在有些項目中，我們可能不同的數據操作需要訪問不同的數據源，這裏僅僅都考慮DAO層技術都是使用mybatis的情況（因爲通常情況mybatis用的比較多）。

首先需要明確的是，我們實際上是對不同的mapper文件設置不同的數據源

一、數據源信息

因爲是不同的數據源，所以我們需要在application.properties文件中配置不同的數據源

spring.datasource.test1.jdbc-url=jdbc:mysql:///testdb1
spring.datasource.test1.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.test1.username=root
spring.datasource.test1.password=root

spring.datasource.test2.jdbc-url=jdbc:mysql:///testdb2
spring.datasource.test2.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.test2.username=root
spring.datasource.test2.password=root

可以看到，我們配置了兩個數據源，分別爲test1,test2，注意的是，數據庫連接需要些jdbc-url，而不是原始的url。

二、創建mybatis配置文件及接口

結構如下：

具體的內容就補貼出來了，沒有什麼意義，也就是簡單的一些操作。

三、創建不同的數據源配置

test1數據源的配置

package com.example.demo.config.dbconfig;

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;
import org.springframework.core.io.support.ResourcePatternResolver;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;

/**
 * 作者：劉興 時間:2019-11-04
 **/
@Configuration
@MapperScan(basePackages = "com.example.demo.mapper.test1", sqlSessionTemplateRef = "test1SqlSessionTemplate")
public class Datasoure1Config {

    @Bean(name = "test1DataSource")
    @ConfigurationProperties(prefix = "spring.datasource.test1")
    @Primary
    public DataSource testDataSource() {
        return DataSourceBuilder.create().build();
    }

    @Bean(name = "test1SqlSessionFactory")
    @Primary
    public SqlSessionFactory testSqlSessionFactory(@Qualifier("test1DataSource") DataSource dataSource)
        throws Exception {
        SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
        bean.setDataSource(dataSource);
        //添加XML目錄
        ResourcePatternResolver resolver = new PathMatchingResourcePatternResolver();
        try {
            bean.setMapperLocations(resolver.getResources("classpath*:mapper/test1/*.xml"));
            return bean.getObject();
        } catch (Exception e) {
            e.printStackTrace();
            throw new RuntimeException(e);
        }

    }

    @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);
    }
}

test2的配置

package com.example.demo.config.dbconfig;

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;
import org.springframework.core.io.support.ResourcePatternResolver;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;

/**
 * 作者：劉興 時間:2019-11-04
 **/
@Configuration
@MapperScan(basePackages = "com.example.demo.mapper.test2", sqlSessionTemplateRef = "test2SqlSessionTemplate")
public class Datasoure2Config {

    @Bean(name = "test2DataSource")
    @ConfigurationProperties(prefix = "spring.datasource.test2")
    public DataSource testDataSource() {
        return DataSourceBuilder.create().build();
    }

    @Bean(name = "test2SqlSessionFactory")
    public SqlSessionFactory testSqlSessionFactory(@Qualifier("test2DataSource") DataSource dataSource)
        throws Exception {
        SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
        bean.setDataSource(dataSource);
        //添加XML目錄
        ResourcePatternResolver resolver = new PathMatchingResourcePatternResolver();
        try {
            bean.setMapperLocations(resolver.getResources("classpath*:mapper/test2/*.xml"));
            return bean.getObject();
        } catch (Exception e) {
            e.printStackTrace();
            throw new RuntimeException(e);
        }

    }

    @Bean(name = "test2TransactionManager")
    @Primary
    public DataSourceTransactionManager testTransactionManager(@Qualifier("test2DataSource") DataSource dataSource) {
        return new DataSourceTransactionManager(dataSource);
    }

    @Bean(name = "test2SqlSessionTemplate")
    @Primary
    public SqlSessionTemplate testSqlSessionTemplate(
        @Qualifier("test2SqlSessionFactory") SqlSessionFactory sqlSessionFactory) throws Exception {
        return new SqlSessionTemplate(sqlSessionFactory);
    }
}