转：
springboot简易集成mybatisPlus+多数据源
【我好用的配置文件：
1、pom:【注意druid吧版本要能获取到jar】
<?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>2.3.2.RELEASE</version> <relativePath/> <!-- lookup parent from repository --> </parent> <groupId>com.example</groupId> <artifactId>demo</artifactId> <version>0.0.1-SNAPSHOT</version> <name>demo</name> <description>Demo project for Spring Boot</description> <properties> <java.version>1.8</java.version> <mysql.version>6.0.6</mysql.version> <mybatisplus.boot.version>3.1.0</mybatisplus.boot.version> <druid.version>1.1.22</druid.version> <dynamic.datasource.boot.version>2.5.4</dynamic.datasource.boot.version> </properties> <dependencies> <dependency> <groupId>commons-net</groupId> <artifactId>commons-net</artifactId> <version>3.3</version> </dependency> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-annotations</artifactId> <version>2.9.0</version> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <optional>true</optional> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>${mysql.version}</version> </dependency> <dependency> <groupId>com.baomidou</groupId> <artifactId>mybatis-plus-boot-starter</artifactId> <version>${mybatisplus.boot.version}</version> </dependency> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <optional>true</optional> </dependency> <dependency> <groupId>com.alibaba</groupId> <artifactId>druid-spring-boot-starter</artifactId> <version>${druid.version}</version> </dependency> <dependency> <groupId>com.baomidou</groupId> <artifactId>dynamic-datasource-spring-boot-starter</artifactId> <version>${dynamic.datasource.boot.version}</version> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build> </project>
2、application.yml:【主要注意加粗的红色两行要配成和自己本地的mapper及xml一致的】
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/account1?serverTimezone=Hongkong&allowMultiQueries=true&useUnicode=true&characterEncoding=UTF-8&autoReconnect=true&useSSL=false # serverTimezone=Hongkong 需要填上时区 username: root password: 123 driverClassName: com.mysql.cj.jdbc.Driver slave: url: jdbc:mysql://localhost:3306/account2?serverTimezone=Hongkong&allowMultiQueries=true&useUnicode=true&characterEncoding=UTF-8&autoReconnect=true&useSSL=false # serverTimezone=Hongkong 需要填上时区 username: root password: 123 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 mapper-locations: classpath:/com/example/demo/verifyaccount/mapper/xml/*Mapper.xml #实体扫描，多个package用逗号或者分号分隔 # typeAliasesPackage: com.example.mybatisplus.entity typeAliasesPackage: com.example.demo.verifyaccount.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
#这个配置会将执行的sql打印出来，在开发或测试的时候可以用
log-impl: org.apache.ibatis.logging.stdout.StdOutImpl 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、启动类：
【要注意这一行：
@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
最好在生产的Mpper类上都加上@Mapper注解
】
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、分页拦截器【加上这个就可以用分页了】
package com.example.demo.config; import com.baomidou.mybatisplus.extension.plugins.PaginationInterceptor; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; @Configuration //@MapperScan("com.example.demo.verifyaccount.*") public class MybatisPlusConfig { @Bean public PaginationInterceptor paginationInterceptor() { return new PaginationInterceptor(); } }
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经过上面4个步骤就可以了，不需要其他config配置类
使用例子：
默认使用主数据源，要想使用其他数据源，可以在生成的service上加@DS("副数据源名称")
eg:这里的slave对应application.yml中的配置
分页查询
eg:
需要现在生成的service中加入分页查询代码：
public interface IDzDetailService extends IService<DzDetail> { public IPage selectPage(IPage iPage, QueryWrapper QueryWrapper); }
然后在业务中调用即可
QueryWrapper<DzDetail> dzDetailQueryWrapper = new QueryWrapper<>();
dzDetailQueryWrapper.eq("status_cd", "1");//未处理
dzDetailQueryWrapper.eq("doc_id", dzDocId);
dzDetailQueryWrapper.orderByAsc("id");
int count = dzDetailService.count(dzDetailQueryWrapper);
//根据文档id查询记录表，分页查询，每一万条处理一次
int size = 10000;
int batchNum = count / size + 1;
IPage<DzDetail> userPage = new Page<>(i*size, size);//参数一是当前页，参数二是每页个数
IPage iPage = dzDetailService.selectPage(userPage, dzDetailQueryWrapper);
List<DzDetail> detailList = iPage.getRecords();
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Mybatisplus多数据源
做最会吹牛的程序猿 2019-04-30 14:37:08 
12005 
收藏 13
12005 收藏 13 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, 'test1@baomidou.com'),
(2, 'Jack', 20, 'test2@baomidou.com'),
(3, 'Tom', 28, 'test3@baomidou.com'),
(4, 'Sandy', 21, 'test4@baomidou.com'),
(5, 'Billie', 24, 'test5@baomidou.com');
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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
<?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 http://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>2.1.4.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.example</groupId>
<artifactId>mybatisplus-springboot</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>mybatisplus-springboot</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>1.8</java.version>
<mysql.version>6.0.6</mysql.version>
<mybatisplus.boot.version>3.1.0</mybatisplus.boot.version>
<druid.version>1.1.10</druid.version>
<dynamic.datasource.boot.version>2.5.4</dynamic.datasource.boot.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>${mysql.version}</version>