标签：MyBatisPlus 数据源 boot version 切换 mysql org com

一、官方文档

https://baomidou.com/pages/a61e1b/#%E6%96%87%E6%A1%A3-documentation

二、操作步骤

1、引入依赖

版本号在下面懒得单独复制了一起贴出来了

       <!-- Dynamic-DataSource多数据源依赖 -->
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>dynamic-datasource-spring-boot-starter</artifactId>
            <version>${dynamic.version}</version>
        </dependency>

<?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>

    <groupId>io.zeal</groupId>
    <artifactId>generator-tools</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>jar</packaging>
    <description>快速构建工具</description>


    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.2.6.RELEASE</version>
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
        <mybatisplus.version>3.3.1</mybatisplus.version>
        <druid.version>1.1.13</druid.version>
        <commons.lang.version>2.6</commons.lang.version>
        <commons.io.version>2.5</commons.io.version>
        <commons.configuration.version>1.10</commons.configuration.version>
        <fastjson.version>1.2.60</fastjson.version>
        <velocity.version>1.7</velocity.version>
        <pagehelper.spring.boot.version>1.2.5</pagehelper.spring.boot.version>
        <mysql.version>8.0.17</mysql.version>
        <oracle.version>11.2.0.3</oracle.version>
        <lombok.version>1.18.24</lombok.version>
        <dynamic.version>3.5.1</dynamic.version>
        <poi.version>4.0.1</poi.version>
        <ooxml.version>4.0.1</ooxml.version>
        <schemas.version>4.0.1</schemas.version>

    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>${mybatisplus.version}</version>
            <exclusions>
                <exclusion>
                    <groupId>com.baomidou</groupId>
                    <artifactId>mybatis-plus-generator</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <!-- Dynamic-DataSource多数据源依赖 -->
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>dynamic-datasource-spring-boot-starter</artifactId>
            <version>${dynamic.version}</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>${druid.version}</version>
        </dependency>
        <dependency>
            <groupId>commons-lang</groupId>
            <artifactId>commons-lang</artifactId>
            <version>${commons.lang.version}</version>
        </dependency>
        <dependency>
            <groupId>commons-io</groupId>
            <artifactId>commons-io</artifactId>
            <version>${commons.io.version}</version>
        </dependency>
        <dependency>
            <groupId>commons-configuration</groupId>
            <artifactId>commons-configuration</artifactId>
            <version>${commons.configuration.version}</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>${fastjson.version}</version>
        </dependency>
        <dependency>
            <artifactId>velocity</artifactId>
            <groupId>org.apache.velocity</groupId>
            <version>${velocity.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-configuration-processor</artifactId>
            <optional>true</optional>
        </dependency>

        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi</artifactId>
            <version>${poi.version}</version>
        </dependency>
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-ooxml</artifactId>
            <version>${ooxml.version}</version>
        </dependency>

        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-ooxml-schemas</artifactId>
            <version>${schemas.version}</version>
        </dependency>

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>${lombok.version}</version>
        </dependency>
        <dependency>
            <groupId>com.github.pagehelper</groupId>
            <artifactId>pagehelper-spring-boot-starter</artifactId>
            <version>${pagehelper.spring.boot.version}</version>
            <exclusions>
                <exclusion>
                    <groupId>org.mybatis</groupId>
                    <artifactId>mybatis</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>org.mybatis</groupId>
                    <artifactId>mybatis-spring</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <!-- mysql驱动 -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>${mysql.version}</version>
        </dependency>
        <!-- oracle驱动 -->
        <dependency>
            <groupId>com.oracle</groupId>
            <artifactId>ojdbc6</artifactId>
            <version>${oracle.version}</version>
        </dependency>
    </dependencies>

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

</project>

2、数据源配置

# mysql
spring:
  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:
          url: jdbc:mysql://127.0.0.1:3306/zeal_acl?useUnicode=true&characterEncoding=UTF-8&useSSL=false&serverTimezone=Asia/Shanghai
          username: root
          password: root
          driverClassName: com.mysql.cj.jdbc.Driver
        slave_1:
          url: jdbc:mysql://127.0.0.1:3306/demo?useUnicode=true&characterEncoding=UTF-8&useSSL=false&serverTimezone=Asia/Shanghai
          username: root
          password: root
          driverClassName: com.mysql.cj.jdbc.Driver
        slave_2:
         url: jdbc:mysql://127.0.0.1:3306/huas?useUnicode=true&characterEncoding=UTF-8&useSSL=false&serverTimezone=Asia/Shanghai
         username: root
         password: root
         driverClassName: com.mysql.cj.jdbc.Driver
        slave_3:
          url: jdbc:mysql://127.0.0.1:3306/huas?useUnicode=true&characterEncoding=UTF-8&useSSL=false&serverTimezone=Asia/Shanghai
          username: root
          password: root
          driverClassName: com.mysql.cj.jdbc.Driver
        slave_4:
          url: jdbc:mysql://127.0.0.1:3306/huas?useUnicode=true&characterEncoding=UTF-8&useSSL=false&serverTimezone=Asia/Shanghai
          username: root
          password: root
          driverClassName: com.mysql.cj.jdbc.Driver

3、使用 @DS 切换数据源。

@DS 可以注解在方法上或类上，同时存在就近原则方法上注解优先于类上注解。

@Service
@DS("slave")
public class UserServiceImpl implements UserService {

  @Autowired
  private JdbcTemplate jdbcTemplate;

  public List selectAll() {
    return  jdbcTemplate.queryForList("select * from user");
  }
  
  @Override
  @DS("slave_1")
  public List selectByCondition() {
    return  jdbcTemplate.queryForList("select * from user where age >10");
  }
}

4、踩坑点

如果在同一个service 中一个方法想调用另外2个方法且另外2个方法上标注的是不同的数据源配置，这样是查不出来了的改进：一个方法调用另外一个service的方法就查的出来

5、测试

查第一个数据源的表

查第三个数据源的表

SUCCESS!!!!! 非常强大

标签：MyBatisPlus,数据源,boot,version,切换,mysql,org,com
From： https://www.cnblogs.com/mangoubiubiu/p/16905166.html

MyBatisPlus 多数据源动态切换