springboot简易集成mybatisPlus+多数据源

该项目主要实现mybatisplus、多数据源、lombok、druid的集成
主要参考 https://mp.baomidou.com/guide/quick-start.html
项目地址：https://github.com/Blankwhiter/mybatisplus-springboot release1.0
项目结构：

一、创建表以及测试数据

CREATE TABLE user
(
	id VARCHAR(32) NOT NULL COMMENT '主键ID',
	name VARCHAR(30) NULL DEFAULT NULL COMMENT '姓名',
	age INT(11) NULL DEFAULT NULL COMMENT '年龄',
	email VARCHAR(50) NULL DEFAULT NULL COMMENT '邮箱',
	PRIMARY KEY (id)
);


INSERT INTO user (id, name, age, email) VALUES
(1, 'Jone', 18, '[email protected]'),
(2, 'Jack', 20, '[email protected]'),
(3, 'Tom', 28, '[email protected]'),
(4, 'Sandy', 21, '[email protected]'),
(5, 'Billie', 24, '[email protected]');

二、引入项目依赖，加入配置，修改启动类，编写实体类和mapper对象（读者可以根据自动生成工具生成这块代码）

1.引入依赖

pom.xml

<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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0modelVersion>
    <parent>
        <groupId>org.springframework.bootgroupId>
        <artifactId>spring-boot-starter-parentartifactId>
        <version>2.1.4.RELEASEversion>
        <relativePath/> 
    parent>
    <groupId>com.examplegroupId>
    <artifactId>mybatisplus-springbootartifactId>
    <version>0.0.1-SNAPSHOTversion>
    <name>mybatisplus-springbootname>
    <description>Demo project for Spring Bootdescription>

    <properties>
        <java.version>1.8java.version>
        <mysql.version>6.0.6mysql.version>
        <mybatisplus.boot.version>3.1.0mybatisplus.boot.version>
        <druid.version>1.1.10druid.version>
        <dynamic.datasource.boot.version>2.5.4dynamic.datasource.boot.version>
    properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-webartifactId>
        dependency>

        <dependency>
            <groupId>org.projectlombokgroupId>
            <artifactId>lombokartifactId>
            <optional>trueoptional>
        dependency>

        <dependency>
            <groupId>mysqlgroupId>
            <artifactId>mysql-connector-javaartifactId>
            <version>${mysql.version}version>
        dependency>

        <dependency>
            <groupId>com.baomidougroupId>
            <artifactId>mybatis-plus-boot-starterartifactId>
            <version>${mybatisplus.boot.version}version>
        dependency>

        <dependency>
            <groupId>org.projectlombokgroupId>
            <artifactId>lombokartifactId>
            <optional>trueoptional>
        dependency>

        <dependency>
            <groupId>com.alibabagroupId>
            <artifactId>druid-spring-boot-starterartifactId>
            <version>${druid.version}version>
        dependency>

        <dependency>
            <groupId>com.baomidougroupId>
            <artifactId>dynamic-datasource-spring-boot-starterartifactId>
            <version>${dynamic.datasource.boot.version}version>
        dependency>

        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-testartifactId>
            <scope>testscope>
        dependency>
    dependencies>


    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.bootgroupId>
                <artifactId>spring-boot-maven-pluginartifactId>
            plugin>
        plugins>
    build>

project>

2.编写配置

application.yml

spring:
  autoconfigure:
    exclude: com.alibaba.druid.spring.boot.autoconfigure.DruidDataSourceAutoConfigure  # 为了某些版本的springboot  @SpringBootApplication(exclude= {DataSourceAutoConfiguration.class}) 无法生效
  datasource:
    dynamic:
      primary: master #设置默认的数据源或者数据源组,默认值即为master，如果读者只是单数据源只需要注释掉slave相关配置即可，这里为了方便演示master与slave保持相同
      datasource:
        master:
          url: jdbc:mysql://localhost:3306/test?serverTimezone=Hongkong&allowMultiQueries=true&useUnicode=true&characterEncoding=UTF-8&autoReconnect=true&useSSL=false  # serverTimezone=Hongkong 需要填上时区
          username: root
          password: 111111
          driverClassName:  com.mysql.cj.jdbc.Driver
        slave:
          url: jdbc:mysql://localhost:3306/test?serverTimezone=Hongkong&allowMultiQueries=true&useUnicode=true&characterEncoding=UTF-8&autoReconnect=true&useSSL=false  # serverTimezone=Hongkong 需要填上时区
          username: root
          password: 111111
          driverClassName:  com.mysql.cj.jdbc.Driver
      initial-size: 10 # 以下是连接池配置
      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
      #validation-query: SELECT 1
      test-while-idle: true
      test-on-borrow: false
      test-on-return: false
      stat-view-servlet:
        enabled: true
        url-pattern: /druid/*
        login-username: druid
        login-password: 123456
      filter:
        stat:
          log-slow-sql: true
          slow-sql-millis: 1000
          merge-sql: false
        wall:
          config:
            multi-statement-allow: true



#mybatis plus
mybatis-plus:
  mapper-locations: classpath:mapper/**/*.xml
  #实体扫描，多个package用逗号或者分号分隔
  typeAliasesPackage: com.example.mybatisplus.entity
  check-config-location: true
  configuration:
    #是否开启自动驼峰命名规则（camel case）映射
    map-underscore-to-camel-case: true
    #全局地开启或关闭配置文件中的所有映射器已经配置的任何缓存
    cache-enabled: false
    call-setters-on-nulls: true
    #配置JdbcTypeForNull, oracle数据库必须配置
    jdbc-type-for-null: 'null'
    #MyBatis 自动映射时未知列或未知属性处理策略 NONE：不做任何处理 (默认值), WARNING：以日志的形式打印相关警告信息, FAILING：当作映射失败处理，并抛出异常和详细信息
    auto-mapping-unknown-column-behavior: warning
  global-config:
    banner: false
    db-config:
      #主键类型  0:"数据库ID自增", 1:"未设置主键类型",2:"用户输入ID (该类型可以通过自己注册自动填充插件进行填充)", 3:"全局唯一ID (idWorker), 4:全局唯一ID (UUID), 5:字符串全局唯一ID (idWorker 的字符串表示)";
      id-type: UUID
      #字段验证策略 IGNORED:"忽略判断", NOT_NULL:"非NULL判断", NOT_EMPTY:"非空判断", DEFAULT 默认的,一般只用于注解里(1. 在全局里代表 NOT_NULL,2. 在注解里代表 跟随全局)
      field-strategy: NOT_EMPTY
      #数据库大写下划线转换
      capital-mode: true
      #逻辑删除值
      logic-delete-value: 0
      #逻辑未删除值
      logic-not-delete-value: 1

server:
  port: 7000

3.修改启动类

MybatisplusSpringbootApplication.java

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;

@SpringBootApplication(exclude= {DataSourceAutoConfiguration.class}) //去掉springboot 默认的数据源配置
@MapperScan("com.example.mybatisplus.mapper") //扫描mapper的包，或者读者可以在对应的mapper上加上@Mapper的注解
public class MybatisplusSpringbootApplication {

    public static void main(String[] args) {
        SpringApplication.run(MybatisplusSpringbootApplication.class, args);
    }

}

4.编写实体

4.1 user.java

import lombok.Data;

/**
 *  user 实体类
 */
@Data
public class User {
    private String id;
    private String name;
    private Integer age;
    private String email;
}

注：读者请自行在开发工具安装lombok插件，或者去掉@data注解换成setter getter方法即可

4.2 UserMapper.java

import com.baomidou.dynamic.datasource.annotation.DS;
import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.example.mybatisplus.entity.User;

/**
 *  用户mapper
 */
@DS("slave") //这里是配置数据源注解，默认是master
public interface UserMapper extends BaseMapper<User> {
}

三、编写测试用例

import com.example.mybatisplus.entity.User;
import com.example.mybatisplus.mapper.UserMapper;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;

import java.util.List;

/**
 * 简单的测试增删改查
 */
@RunWith(SpringRunner.class)
@SpringBootTest
public class MybatisplusSpringbootApplicationTests {


    @Autowired
    private UserMapper userMapper;

    @Test
    public void addUser() {
        User user = new User();
        user.setAge(200);
        user.setEmail("[email protected]");
        user.setName("belongHuang");
        userMapper.insert(user);
    }

    @Test
    public void updateUser() {
        User user = userMapper.selectById(1);
        user.setAge(300);
        int i = userMapper.updateById(user);
        if (i>0) {
            System.out.println("修改成功");
        }else {
            System.out.println("修改失败");
        }
    }

    @Test
    public void deleteUser() {
        int i = userMapper.deleteById(1);
        if (i>0) {
            System.out.println("删除成功");
        }else {
            System.out.println("删除失败");
        }
    }
    @Test
    public void selectUser() {
        List<User> users = userMapper.selectList(null);
        users.stream().map(User::getName).forEach(System.out::println);//打印出所用用户名字
    }

}

本文侧重点于集成，更多功能移步至官网。