Springboot如何同时装配两个相同类型数据库

目录

• 同时装配两个相同类型数据库
• 配置连接两个或多个数据库

同时装配两个相同类型数据库

1.配置文件：

spring:
  profiles:
    active: dev

  datasource:
    primary:
      jdbc-url: jdbc:sqlserver://localhost:1111;DatabaseName=DB1
      driverClassName: com.microsoft.sqlserver.jdbc.SQLServerDriver
      type: com.alibaba.druid.pool.DruidDataSource
      username: root
      password: root
    secondary:
      jdbc-url: jdbc:sqlserver://localhost:1111;DatabaseName=DB2
      driverClassName: com.microsoft.sqlserver.jdbc.SQLServerDriver
      type: com.alibaba.druid.pool.DruidDataSource
      username: root
      password: root

2.配置类：

①主配置类：DataSourceConfigPrimary

@Configuration
@MapperScan(basePackages = "com.message.dao.primary", sqlSessionFactoryRef = "primarySqlSessionFactory")
public class DataSourceConfigPrimary {

    // 将这个对象放入Spring容器中
    @Bean(name = "primaryDataSource")
    // 表示这个数据源是默认数据源
    @Primary
    // 读取application.properties中的配置参数映射成为一个对象
    // prefix表示参数的前缀
    @ConfigurationProperties(prefix = "spring.datasource.primary")
    public DataSource getDateSourcePrimary()
    {
        return DataSourceBuilder.create().build();
    }

    @Bean(name = "primarySqlSessionFactory")
    // 表示这个数据源是默认数据源
    @Primary
    // @Qualifier表示查找Spring容器中名字为test1DataSource的对象
    public SqlSessionFactory primarySqlSessionFactory(@Qualifier("primaryDataSource") DataSource datasource)
            throws Exception
    {
        SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
        bean.setDataSource(datasource);
        bean.setMapperLocations(
                // 设置mybatis的xml所在位置
                new PathMatchingResourcePatternResolver().getResources("classpath:mapper/primary/*.xml"));
        return bean.getObject();
    }

    @Bean("primarySqlSessionTemplate")
    // 表示这个数据源是默认数据源
    @Primary
    public SqlSessionTemplate primarySqlSessionTemplate(
            @Qualifier("primarySqlSessionFactory") SqlSessionFactory sessionFactory)
    {
        return new SqlSessionTemplate(sessionFactory);
    }
}

②次配置类：DataSourceConfigSecondary

@Configuration
@MapperScan(basePackages = "com.message.dao.secondary", sqlSessionFactoryRef = "secondarySqlSessionFactory")
public class DataSourceConfigSecondary {
    @Bean(name = "secondaryDataSource")
    @ConfigurationProperties(prefix = "spring.datasource.secondary")
    public DataSource getDateSource2()
    {
        return DataSourceBuilder.create().build();
    }

    @Bean(name = "secondarySqlSessionFactory")
    public SqlSessionFactory secondarySqlSessionFactory(@Qualifier("secondaryDataSource") DataSource datasource)
            throws Exception
    {
        SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
        bean.setDataSource(datasource);
        bean.setMapperLocations(
                new PathMatchingResourcePatternResolver().getResources("classpath:mapper/secondary/*.xml"));
        return bean.getObject();
    }

    @Bean("secondarySqlSessionTemplate")
    public SqlSessionTemplate secondarySqlSessionTemplate(
            @Qualifier("secondarySqlSessionFactory") SqlSessionFactory sessionFactory)
    {
        return new SqlSessionTemplate(sessionFactory);
    }
}

3.扫描XML

4.启动类：

@SpringBootApplication(scanBasePackages = {"com.lalal.*"})
public class MessageApplication extends SpringBootServletInitializer {
    public static void main(String[] args) {
        SpringApplication.run(MessageApplication.class, args);
    }

    @Bean
    public RestTemplate restTemplate(){
        return new RestTemplate();
    }
}

配置连接两个或多个数据库

背景：

项目中需要从两个不同的数据库查询数据，之前实现方法是：springboot配置连接一个数据源，另一个使用jdbc代码连接。

为了改进，现在使用SpringBoot配置连接两个数据源

实现效果：

一个SpringBoot项目，同时连接两个数据库：比如一个是pgsql数据库，一个是oracle数据库

（啥数据库都一样，连接两个同为oracle的数据库，或两个不同的数据库，只需要更改对应的driver-class-name和jdbc-url等即可）

注意：连接什么数据库，要引入对应数据库的包

实现步骤：

1、修改application.yml，添加一个数据库连接配置

（我这里是yml格式，后缀为properties格式是一样的

server:
  port: 7101
spring:
  jpa:
    show-sql: true
  datasource:
    test1:
      driver-class-name: org.postgresql.Driver
      jdbc-url: jdbc:postgresql://127.0.0.1:5432/test  #测试数据库
      username: root
      password: root

    test2:
      driver-class-name: oracle.jdbc.driver.OracleDriver
      jdbc-url: jdbc:oracle:thin:@127.0.0.1:8888:orcl  #测试数据库
      username: root
      password: root

特别注意：

（1）使用test1、test2区分两个数据库连接

（2）url改为：jdbc-url

2、使用代码进行数据源注入，和扫描dao层路径（以前是在yml文件里配置mybatis扫描dao的路径）

新建config包，包含数据库1和数据库2的配置文件

（1）第一个数据库作为主数据库，项目启动默认连接此数据库

DataSource1Config.java

package com.test.config;
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.Qualifier;
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 org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;
import javax.sql.DataSource;

@Configuration
@MapperScan(basePackages = "com.test.dao.test1", sqlSessionTemplateRef  = "test1SqlSessionTemplate")
public class DataSource1Config {

    @Bean(name = "test1DataSource")
    @ConfigurationProperties(prefix = "spring.datasource.test1")
    @Primary
    public DataSource testDataSource() {
        return DataSourceBuilder.create().build();
    }

    @Bean(name = "test1SqlSessionFactory")
    @Primary
    public SqlSessionFactory testSqlSessionFactory(@Qualifier("test1DataSource") DataSource dataSource) throws Exception {
        SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
        bean.setDataSource(dataSource);
        bean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath:test1/*.xml"));
        return bean.getObject();
    }

    @Bean(name = "test1TransactionManager")
    @Primary
    public DataSourceTransactionManager testTransactionManager(@Qualifier("test1DataSource") DataSource dataSource) {
        return new DataSourceTransactionManager(dataSource);
    }

    @Bean(name = "test1SqlSessionTemplate")
    @Primary
    public SqlSessionTemplate testSqlSessionTemplate(@Qualifier("test1SqlSessionFactory") SqlSessionFactory sqlSessionFactory) throws Exception {
        return new SqlSessionTemplate(sqlSessionFactory);
    }
}

特别注意：

（1）主数据库都有 @Primary注解，从数据库都没有

（2）第二个数据库作为从数据库

DataSource2Config.java

package com.test.config;
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.Qualifier;
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.core.io.support.PathMatchingResourcePatternResolver;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;
import javax.sql.DataSource;

@Configuration
@MapperScan(basePackages = "com.test.dao.test2", sqlSessionTemplateRef  = "test2SqlSessionTemplate")
public class DataSource2Config {

    @Bean(name = "test2DataSource")
    @ConfigurationProperties(prefix = "spring.datasource.test2")
    public DataSource testDataSource() {
        return DataSourceBuilder.create().build();
    }

    @Bean(name = "test2SqlSessionFactory")
    public SqlSessionFactory testSqlSessionFactory(@Qualifier("test2DataSource") DataSource dataSource) throws Exception {
        SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
        bean.setDataSource(dataSource);
        bean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath:test2/*.xml"));
        return bean.getObject();
    }

    @Bean(name = "test2TransactionManager")
    public DataSourceTransactionManager testTransactionManager(@Qualifier("test2DataSource") DataSource dataSource) {
        return new DataSourceTransactionManager(dataSource);
    }

    @Bean(name = "test2SqlSessionTemplate")
    public SqlSessionTemplate testSqlSessionTemplate(@Qualifier("test2SqlSessionFactory") SqlSessionFactory sqlSessionFactory) throws Exception {
        return new SqlSessionTemplate(sqlSessionFactory);
    }
}

3、 在dao文件夹下，新建test1和test2两个包，分别放两个不同数据库的dao层文件

（1）TestDao1.java

@Component
public interface TestDao1 {
    List<DailyActivityDataMiddle> selectDailyActivity();
}

（2）TestDao2.java

@Component
public interface TestDao2 {
    List<MovieShowTest> selectDailyActivity();
}

4、 在resource下新建test1和test2两个文件夹，分别放入对应dao层的xml文件

（我原来项目的dao的xml文件在resource目录下，你们在自己的项目对应目录下即可）

注意dao的java文件和dao的xml文件名字要一致

（1）TestDao1.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.test.dao.test1.TestDao1">
    <select id="selectDailyActivity" resultType="com.test.pojo.DailyActivityDataMiddle">
        SELECT * FROM daily_activity_data_middle
    </select>
</mapper>

（2）TestDao2.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.test.dao.test2.TestDao2">
    <select id="selectDailyActivity" resultType="com.test.pojo.MovieShowTest">
        SELECT * FROM movieshowtest
    </select>
</mapper>

5、测试

在controller文件里，注入两个数据库的dao，分别查询数据

@RestController
public class TestController extends BaseController{
    @Autowired
    private PropertiesUtils propertiesUtils;
    @Autowired
    private TestDao1 testDao1;
    @Autowired
    private TestDao2 testDao2;

    @RequestMapping(value = {"/test/test1"},method = RequestMethod.POST)
    public Result<JSONObject> DataStatistics (@RequestBody JSONObject body) throws Exception {
        Result<JSONObject> result = new Result<>(ICommon.SUCCESS, propertiesUtils.get(ICommon.SUCCESS));
        JSONObject object = new JSONObject();
        object.put("data",testDao1.selectDailyActivity());
        result.setResult(object);
        return result;
    }

    @RequestMapping(value = {"/test/test2"},method = RequestMethod.POST)
    public Result<JSONObject> DataStatisticsaa (@RequestBody JSONObject body) throws Exception {
        Result<JSONObject> result = new Result<>(ICommon.SUCCESS, propertiesUtils.get(ICommon.SUCCESS));
        JSONObject object = new JSONObject();
        object.put("data",testDao2.selectDailyActivity());
        result.setResult(object);
        return result;
    }
}

以上为个人经验，希望能给大家一个参考，也希望大家多多支持我们。