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Springboot装配两个数据库 Springboot怎样同时装配两个相同类型数据库

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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。

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