前言

因为项目要求需要两个项目中同时使用3个数据源,然后就折腾了一下。从网上也看了许多的案例,但是都多多少少有问题。比如说MyBatis只能用注解开发,而不能用配置之类的。这个我觉得无坑版吧,尽量会说的详细一点。

目录结构

SpringBoot MyBatisPlus 配置多数据源 springboot mybatis druid多数据源_java

主要依赖
<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.1.0</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
<!--    druid 连接池  -->        
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
            <version>1.1.10</version>
        </dependency>

<!--  分页插件,尝试高版本和spring-boot-starter-pagehalper 均启动失败     -->
        <dependency>
            <groupId>com.github.pagehelper</groupId>
            <artifactId>pagehelper</artifactId>
            <version>4.1.6</version>
        </dependency>

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

在 pom.xml的<build>标签中添加静态资源扫描:

<resources>
    <resource>
        <directory>src/main/java</directory>
        <includes>
            <include>**/*.*</include>
        </includes>
    </resource>
    <resource>
        <directory>src/main/resources</directory>
        <includes>
            <include>**/*.*</include>
        </includes>
    </resource>
</resources>

配置文件

application.yml 配置

主要给出数据源的配置

spring: 
  datasource:
    pigxpf:
      type: com.alibaba.druid.pool.DruidDataSource
      
      # 注意在配置多数据源时这里要用 jdbc-url,驱动名需要用 driver-class-name
      jdbc-url: jdbc:mysql://localhost:3306/pf?useUnicode=true&characterEncoding=utf-8&useSSL=false&serverTimezone = GMT
      username: root
      password: 123456
      driver-class-name: com.mysql.cj.jdbc.Driver

    pigxhr:
      type: com.alibaba.druid.pool.DruidDataSource
      jdbc-url: jdbc:mysql://localhost:3306/hr?useUnicode=true&characterEncoding=utf-8&useSSL=false&serverTimezone = GMT
      username: root
      password: 123456
      driver-class-name: com.mysql.cj.jdbc.Driver

# mybatis配置都在 resources/mybatis/mabatis-config.xml中,这里配置并不会自动扫描。
mybatis:
  # 加载全局的配置文件
  configLocation: classpath:mybatis/mybatis-config.xml
mybatis-config配置
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">

<configuration>
    <properties>
        <property name="dialect" value="mysql" />
    </properties>
    <settings>
        <!-- 开启驼峰匹配 -->
        <setting name="mapUnderscoreToCamelCase" value="true"/>
        <!-- 这个配置使全局的映射器启用或禁用缓存。系统默认值是true,设置只是为了展示出来 -->
        <setting name="cacheEnabled" value="true" />
        <!-- 全局启用或禁用延迟加载。当禁用时,所有关联对象都会即时加载。 系统默认值是true,设置只是为了展示出来 -->
        <setting name="lazyLoadingEnabled" value="true" />
        <!-- 允许或不允许多种结果集从一个单独的语句中返回(需要适合的驱动)。 系统默认值是true,设置只是为了展示出来 -->
        <setting name="multipleResultSetsEnabled" value="true" />
        <!--使用列标签代替列名。不同的驱动在这方便表现不同。参考驱动文档或充分测试两种方法来决定所使用的驱动。 系统默认值是true,设置只是为了展示出来 -->
        <setting name="useColumnLabel" value="true" />
        <!--允许 JDBC 支持生成的键。需要适合的驱动。如果设置为 true 则这个设置强制生成的键被使用,尽管一些驱动拒绝兼容但仍然有效(比如
            Derby)。 系统默认值是false,设置只是为了展示出来 -->
        <setting name="useGeneratedKeys" value="false" />
        <!--配置默认的执行器。SIMPLE 执行器没有什么特别之处。REUSE 执行器重用预处理语句。BATCH 执行器重用语句和批量更新 系统默认值是SIMPLE,设置只是为了展示出来 -->
        <setting name="defaultExecutorType" value="SIMPLE" />
        <!--设置超时时间,它决定驱动等待一个数据库响应的时间。 系统默认值是null,设置只是为了展示出来 -->
        <setting name="defaultStatementTimeout" value="25000" />
    </settings>

    <!-- 分页插件 -->
    <plugins>
        <plugin interceptor="com.github.pagehelper.PageHelper">
            <!-- 数据库方言 -->
            <property name="dialect" value="mysql" />
            <property name="offsetAsPageNum" value="true" />
            <!-- 设置为true时,使用RowBounds分页会进行count查询 会去查询出总数 -->
            <property name="rowBoundsWithCount" value="true" />
            <property name="pageSizeZero" value="true" />
            <property name="reasonable" value="true" />
        </plugin>
    </plugins>
</configuration>
Application.java启动类

我这里什么都没动也能正常用,有的博客说要取消自动扫描,因为自动扫描只会加载一个数据源。

配置类

DataSourceConfig.java
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.jdbc.DataSourceBuilder;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;

import javax.sql.DataSource;


/**
 * @author: litblue
 * @Time : 2019/7/28 10:38
 * @Email: litblue@163.com
 * 绝不敷衍,毫不懈怠
 *
 * 手动配置数据源
 *
 */

@Configuration
public class DataSourceConfig {

    @Bean(name = "pigxpfDatasource")
    @Primary   /*  主要数据源 */
    @ConfigurationProperties(prefix = "spring.datasource.pigxpf")
    public DataSource pigxpfDatasource(){
        return DataSourceBuilder.create().build();
    }

    @Bean(name = "pigxhrDatasource")
    @ConfigurationProperties(prefix = "spring.datasource.pigxhr")
    public DataSource pighrDatasource(){
        return DataSourceBuilder.create().build();
    }
}
MyBatisPigxpfConfig.java
import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.SqlSessionTemplate;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.core.io.DefaultResourceLoader;
import org.springframework.core.io.Resource;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;

import javax.sql.DataSource;


/**
 * @author: litblue
 * @Time : 2019/7/28 10:53
 * @Email: litblue@163.com
 * 绝不敷衍,毫不懈怠
 */

@Configuration
@MapperScan(basePackages = {"com.pigx.pigxpf.mapper"},sqlSessionFactoryRef = "pigxpfSqlFactory")
public class MyBatisPigxpfConfig {

    @Autowired
    @Qualifier("pigxpfDatasource")
    private DataSource pigxpfSource;

    // 加载配置文件
    @Value("${mybatis.configLocation}")
    private String configLocation;


    @Bean(name="pigxpfSqlFactory")
    @Primary
    public SqlSessionFactory pigxpfSqlSessionFactory() throws Exception{
        SqlSessionFactoryBean factoryBean = new SqlSessionFactoryBean();
        factoryBean.setDataSource(pigxpfSource);
        // 配置类型别名
        factoryBean.setTypeAliasesPackage("com.pigx.pigxpf.entity");
        // 配置mapper的扫描,找到所有的mapper.xml映射文件
        Resource[] resources = new PathMatchingResourcePatternResolver()
                .getResources("classpath:mapper/*.xml");
        factoryBean.setMapperLocations(resources);

        // 加载配置文件
        factoryBean.setConfigLocation(new DefaultResourceLoader().getResource(configLocation));

        return factoryBean.getObject();
    }

    @Bean(name="pigxpfSqlFactory")
    @Primary
    public SqlSessionTemplate pigxpfSqlSessionTemplate() throws Exception{
        SqlSessionTemplate template = new SqlSessionTemplate(pigxpfSqlSessionFactory());
        return template;
    }
}
MyBatisPigxhrConfig.java

这里与上述相同,只是不需要添加@Primary 注解了。

import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.SqlSessionTemplate;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.io.DefaultResourceLoader;
import org.springframework.core.io.Resource;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;

import javax.sql.DataSource;

/**
 * @author: litblue
 * @Time : 2019/7/28 11:26
 * @Email: litblue@163.com
 * 绝不敷衍,毫不懈怠
 */

@Configuration
@MapperScan(basePackages = {"com.pigx.pigxpf.mapper"},sqlSessionFactoryRef = "pigxpfSqlFactory")
public class MyBatisPigxhrConfig {

    @Autowired
    @Qualifier("pigxhrDatasource")
    private DataSource pigxhrSource;

    @Value("${mybatis.configLocation}")
    private String configLocation;

    @Bean(name="pigxhrSqlFactory")
    public SqlSessionFactory pigxhrSqlSessionFactory() throws Exception{
        SqlSessionFactoryBean factoryBean = new SqlSessionFactoryBean();
        factoryBean.setDataSource(pigxhrSource);
        // 配置类型别名
        factoryBean.setTypeAliasesPackage("com.pigx.pigxpf.entity");
        // 配置mapper的扫描,找到所有的mapper.xml映射文件
        Resource[] resources = new PathMatchingResourcePatternResolver()
                .getResources("classpath:mapper/*.xml");
        factoryBean.setMapperLocations(resources);

        // 加载配置文件
        factoryBean.setConfigLocation(new DefaultResourceLoader().getResource(configLocation));

        return factoryBean.getObject();
    }

    @Bean(name="pigxhrSqlFactory")
    public SqlSessionTemplate pigxhrSqlSessionTemplate() throws Exception{
        SqlSessionTemplate template = new SqlSessionTemplate(pigxhrSqlSessionFactory());
        return template;
    }
}
运行结果

SpringBoot MyBatisPlus 配置多数据源 springboot mybatis druid多数据源_多数据源_02

最后

关于Druid 的监控的暂时还没有配置,也还不知道咋弄,过段时间再更新。