SpringBoot增加Mybatis-plus並配置雙數據源

MyBatis-Plus（簡稱 MP）是一個 MyBatis 的增強工具，在 MyBatis 的基礎上只做增強不做改變，爲簡化開發、提高效率而生。

Mybatis-Plus官網地址

1.創建sb項目

2.添加MyBatis-Plus依賴

<!-- 以上省略sb的相關依賴，下面這個是web項目依賴 -->
<dependency>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-web</artifactId>
</dependency>

<!-- mybatis-plus依賴 -->
<dependency>
		<groupId>com.baomidou</groupId>
		<artifactId>mybatis-plus-boot-starter</artifactId>
		<version>3.0.6</version>
</dependency>

<!-- 連接池依賴+數據庫驅動包依賴 -->
<dependency>
		<groupId>mysql</groupId>
		<artifactId>mysql-connector-java</artifactId>
		<scope>runtime</scope>
</dependency>
<dependency>
		<groupId>com.alibaba</groupId>
		<artifactId>druid</artifactId>
		<version>1.1.10</version>
</dependency>

3.添加配置類

兩個數據源，我們這裏配置兩個類

 配置類1

package com.yanva.dm.common.config;

import com.alibaba.druid.pool.DruidDataSource;
import com.baomidou.mybatisplus.extension.spring.MybatisSqlSessionFactoryBean;
import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.context.properties.ConfigurationProperties;
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 = DruidConfig.PACKAGE, sqlSessionFactoryRef = "sqlSessionFactory1")
public class DruidConfig {
    static final String PACKAGE = "com.yanva.dm.*.mapper";
    static final String MAPPER_LOCATION = "classpath:mapper/*/*.xml";


    @Bean("db1")
    @ConfigurationProperties(prefix = "spring.datasource.druid.master")
    public DataSource druidDataSource1() {
        DruidDataSource druidDataSource = new DruidDataSource();
        return druidDataSource;
    }

    @Bean("sqlSessionFactory1")
    public SqlSessionFactory sqlSessionFactory1(@Qualifier("db1")DataSource db1) throws Exception {
        MybatisSqlSessionFactoryBean sqlSessionFactoryBean = new MybatisSqlSessionFactoryBean();
        sqlSessionFactoryBean.setDataSource(db1);
        sqlSessionFactoryBean.setMapperLocations(new PathMatchingResourcePatternResolver()
                .getResources(DruidConfig.MAPPER_LOCATION));
        return sqlSessionFactoryBean.getObject();

    }




}

 配置類2

package com.yanva.dm.common.config;

import com.alibaba.druid.pool.DruidDataSource;
import com.baomidou.mybatisplus.extension.spring.MybatisSqlSessionFactoryBean;
import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.context.properties.ConfigurationProperties;
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 = DruidConfig1.PACKAGE, sqlSessionFactoryRef = "sqlSessionFactory2")
public class DruidConfig1 {
    static final String PACKAGE = "com.yanva.dm.slavedb.*.mapper";
    static final String MAPPER_LOCATION = "classpath:mapper/slavedb/*.xml";

    @Bean("db2")
    @ConfigurationProperties(prefix = "spring.datasource.druid.slave")
    public DataSource druidDataSource1() {
        DruidDataSource druidDataSource = new DruidDataSource();
        return druidDataSource;
    }

    @Bean("sqlSessionFactory2")
    public SqlSessionFactory sqlSessionFactory1(@Qualifier("db2")DataSource db2) throws Exception {
        MybatisSqlSessionFactoryBean  sqlSessionFactoryBean = new MybatisSqlSessionFactoryBean();
        sqlSessionFactoryBean.setDataSource(db2);
        sqlSessionFactoryBean.setMapperLocations(new PathMatchingResourcePatternResolver()
                .getResources(DruidConfig1.MAPPER_LOCATION));
        return sqlSessionFactoryBean.getObject();

    }




}

 * 注意 PACKAGE 和MAPPER_LOCATION 還有 @ConfigurationProperties(prefix = "spring.datasource.druid.slave")

    都需要根據具體情況配置。

 

4.修改application.yml文件（對數據源的配置和mybatis-plus的配置）

 

server:
  port: 9898
spring:
  datasource:
    name: druidDataSource
    type: com.alibaba.druid.pool.DruidDataSource
    druid:
      master:
        driver-class-name: com.mysql.cj.jdbc.Driver
        url: jdbc:mysql://localhost:3306/home?allowMultiQueries=true&useUnicode=true&serverTimezone=UTC&characterEncoding=UTF-8&useSSL=false
        username: root
        password: root
        initial-size: 10
        max-active: 100
        min-idle: 10
        max-wait: 60000
        pool-prepared-statements: true
        max-pool-prepared-statement-per-connection-size: 20
        time-between-eviction-runs-millis: 60000
        min-evictable-idle-time-millis: 300000
        test-while-idle: true
        test-on-borrow: false
        test-on-return: false
      slave:
        driver-class-name: com.mysql.cj.jdbc.Driver
        url: jdbc:mysql://localhost:3306/yinzi_database?allowMultiQueries=true&useUnicode=true&serverTimezone=UTC&characterEncoding=UTF-8&useSSL=false
        username: root
        password: root

        initial-size: 10
        max-active: 100
        min-idle: 10
        max-wait: 60000
        pool-prepared-statements: true
        max-pool-prepared-statement-per-connection-size: 20
        time-between-eviction-runs-millis: 60000
        min-evictable-idle-time-millis: 300000

        test-while-idle: true
        test-on-borrow: false
        test-on-return: false
  freemarker:
    template-loader-path: classpath:templates/
    suffix: .ftl

mybatis-plus:
  mapper-locations: classpath:dao/*Mapper.xml
  type-aliases-package: com.yanva.dm.entity

* 注意 yml文件中，屬性和值一定要有空格，還要格外注意縮進，同等級的，縮進必須一致。

* 注意 兩個數據源的表不可以是同名的 ，不同數據源所對應的mapper文件也需要放在不同的包中。因爲框架是通過映射關係來自動區分數據源的