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Springboot+MybatisPlust+ControllerAdvice ；Mybatis_Plus多数据源，controller统一异常返回

Springboot+MybatisPlus多数据源+controller全局异常返回

1、多数据源

1.1 添加依赖

<?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>
<!--    <modelVersion>4.0.0</modelVersion>-->
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.4.5</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.mybatis_plus</groupId>
    <artifactId>mybatisplus</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>mybatisplus</name>
    <description>Demo project for Spring Boot</description>
    <properties>
        <java.version>1.8</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.1.3</version>
        </dependency>
        <dependency>
            <groupId>com.mybatiplus</groupId>
            <artifactId>demo</artifactId>
            <version>0.0.1-SNAPSHOT</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
<!--添加MybatisPlus依赖-->
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.3.2</version>
        </dependency>
<!--添加Mysql依赖-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.21</version>
        </dependency>
<!--Lombok不用写get、set-->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.12</version>
        </dependency>
<!--代码生成器-->
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-generator</artifactId>
            <version>3.4.1</version>
        </dependency>
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-core</artifactId>
            <version>3.4.1</version>
        </dependency>
        <!--MyBatis Plus 多数据源-->
        <!--不造为啥 dynamic-datasource-spring-boot-starter 会依赖这个 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-actuator</artifactId>
        </dependency>
        <dependency>
            <groupId>org.apache.velocity</groupId>
            <artifactId>velocity-engine-core</artifactId>
            <version>2.0</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-autoconfigure</artifactId>
            <version>2.4.5</version>
            <scope>compile</scope>
        </dependency>
        <dependency>
            <groupId>org.codehaus.jettison</groupId>
            <artifactId>jettison</artifactId>
            <version>1.4.0</version>
            <scope>test</scope>
        </dependency>
<!--            <dependency>
                <groupId>org.mybatis</groupId>
                <artifactId>mybatis</artifactId>
                <version>3.5.6</version>
            </dependency>-->
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>dynamic-datasource-spring-boot-starter</artifactId>
            <version>3.2.1</version>
        </dependency>
        <dependency>
            <groupId>org.codehaus.jettison</groupId>
            <artifactId>jettison</artifactId>
            <version>1.4.0</version>
            <scope>compile</scope>
        </dependency>
    </dependencies>
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
        <resources>
            <resource>
                <directory>src/main/java</directory>
                <includes>
                    <include>**/*.xml</include>
                </includes>
                <filtering>false</filtering>
            </resource>
        </resources>
    </build>
</project>

1.2 MybatisPlus代码生成器

public class SggCodeGenerator {

    public static void main(String[] args) {

        // 1、创建代码生成器
        AutoGenerator mpg = new AutoGenerator();

        // 2、全局配置
        GlobalConfig gc = new GlobalConfig();
        String projectPath = System.getProperty("user.dir");
        gc.setOutputDir(projectPath + "/mybatisplus/src/main/java");
        gc.setAuthor("ken");
        gc.setOpen(false); //生成后是否打开资源管理器
        gc.setFileOverride(false); //重新生成时文件是否覆盖
        gc.setServiceName("%sService"); //去掉Service接口的首字母I
        gc.setIdType(IdType.ID_WORKER_STR); //主键策略
        gc.setDateType(DateType.ONLY_DATE);//定义生成的实体类中日期类型
        gc.setSwagger2(false);//开启Swagger2模式

        mpg.setGlobalConfig(gc);

        // 3、数据源配置
        DataSourceConfig dsc = new DataSourceConfig();
        dsc.setUrl("jdbc:mysql://localhost:3306/vhr?serverTimezone=Asia/Shanghai&characterEncoding=utf8&useUnicode=true&useSSL=false");
        dsc.setDriverName("com.mysql.cj.jdbc.Driver");
        dsc.setUsername("root");
        dsc.setPassword("root");
        dsc.setDbType(DbType.MYSQL);
        mpg.setDataSource(dsc);

        // 4、包配置
        PackageConfig pc = new PackageConfig();
        pc.setModuleName(null); //模块名
        pc.setParent("com.ken.hr");
        pc.setController("controller");
        pc.setEntity("entity");
        pc.setService("service");
        pc.setMapper("mapper");
        mpg.setPackageInfo(pc);

        // 5、策略配置
        StrategyConfig strategy = new StrategyConfig();
        strategy.setInclude("hr");//对那一张表生成代码
        strategy.setNaming(NamingStrategy.underline_to_camel);//数据库表映射到实体的命名策略
        strategy.setTablePrefix(pc.getModuleName() + "_"); //生成实体时去掉表前缀

        strategy.setColumnNaming(NamingStrategy.underline_to_camel);//数据库表字段映射到实体的命名策略
        strategy.setEntityLombokModel(true); // lombok 模型 @Accessors(chain = true) setter链式操作

        strategy.setRestControllerStyle(true); //restful api风格控制器
        strategy.setControllerMappingHyphenStyle(true); //url中驼峰转连字符

        mpg.setStrategy(strategy);

        // 6、执行
        mpg.execute();
    }
}

1.3 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.ken.role.mapper.RoleMapper">




<!--不带条件的语句-->
    <select id="testReturnListMap" resultType="java.util.Map">

        select id,name,nameZh from role

    </select>


<!--带条件的查询语句-->
    <select id="testReturnListMapById" resultType="java.util.Map" parameterType="integer">

   select id,name from role where 1=1
   <if test="id!= null"  >
    and id=#{id, jdbcType=INTEGER  }

   </if>



    </select>

<!--带参数的存储过程-->

    <select id="exePro" parameterType="integer" resultType="java.util.Map" statementType="CALLABLE">
        {

        call stu_findByid (

        #{id,jdbcType=VARCHAR,mode=IN}
        )
        }



    </select>



    <!--带参数的存储过程-->

    <select id="exeProByName" parameterType="com.ken.role.entity.Role" resultType="java.util.Map" statementType="CALLABLE">
        {

        call stu_findByid (

        #{id,jdbcType=VARCHAR,mode=IN}
        )
        }



    </select>




</mapper>

1.4 dao

package com.ken.role.mapper;

import com.baomidou.dynamic.datasource.annotation.DS;
import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.ken.role.entity.Role;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;

import java.util.List;
import java.util.Map;

/**

 * @author ken
 * @since 2021-05-16
 */

@Mapper
public interface RoleMapper extends BaseMapper<Role> {


    /**
     *
     * 查询所有的Role
     *
     * @return
     */
    List<Map<String, Object>> testReturnListMap() ;


    /**
     *
     * 通过ID查询记录
     * @param id
     * @return
     */
    List<Map<String,Object>>  testReturnListMapById(@Param("id") Integer id);



    /**
     *
     * 通过ID查询记录
     * @param id
     * @return
     */
    List<Map<String, Object>> exePro(@Param("id") Integer id);


    /**
     * 通过ID查询记录
     * @param role
     * @return
     */

    @DS("master")
    List<Map<String, Object>> exeProByName(Role role);



}

1.5 Yml

server:
  port: 9009

mybatis-plus:
  mapper-locations: classpath:com/ken/role/mapper/xml/*.xml
  configuration:
    default-statement-timeout: 3

spring:
  application:
    name: mybatis_plus
  datasource:
    dynamic:
      primary: master  #设置默认的数据源或者数据源组,默认值即为master
      strict: false #严格匹配数据源,默认false. true未匹配到指定数据源时抛异常,false使用默认数据源
      datasource:
        master:      #默认数据源
          url: jdbc:mysql://localhost:3306/vhr?serverTimezone=Asia/Shanghai&characterEncoding=utf8&useUnicode=true&useSSL=false
          username: root
          password: root
          driver-calss-name: com.mysql.cj.jdbc.Driver

        db02:
          url: jdbc:mysql://localhost:3306/demo2?serverTimezone=Asia/Shanghai&characterEncoding=utf8&useUnicode=true&useSSL=false
          username: root
          password: root
          driver-calss-name: com.mysql.cj.jdbc.Driver

        db03:
          url: jdbc:mysql://localhost:3306/demo?serverTimezone=Asia/Shanghai&characterEncoding=utf8&useUnicode=true&useSSL=false
          username: root
          password: root
          driver-calss-name: com.mysql.cj.jdbc.Driver

2. 注意点：

pom.xml 里面必须增加resources 指定Mapper.xml的位置，不然会提示找不到mapper
在Yml配置里面里面增加mybatis locations 也可以
controller需要在启动类加上
controller全局异常需要
```
@Bean
MyExceptionHandler myExceptionHandler(){

    return  new MyExceptionHandler();
}
```
不然全局异常类和controller要放到一个package上面

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原文地址：https://www.cnblogs.com/Ken2018/p/14782832.html