springboot多数据源JdbcTemplate和SessionFactory两种方式学习

第一种方式JdbcTemplate 多数据

1，贴，配置文件

spring:
  datasource:
    druid:
      # 数据库访问配置, 使用druid数据源
      # 数据源1 mysql
      mysql:
        type: com.alibaba.druid.pool.DruidDataSource
        driver-class-name: com.mysql.jdbc.Driver
        url: jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=UTF-8&rewriteBatchedStatements=true&autoReconnect=true&failOverReadOnly=false&zeroDateTimeBehavior=convertToNull
        username: root
        password: 123456
      # 数据源2 oracle
      oracle: 
        type: com.alibaba.druid.pool.DruidDataSource
        driver-class-name: oracle.jdbc.driver.OracleDriver
        url: jdbc:oracle:thin:@localhost:1521:ORCL
        username: test
        password: 123456

2，贴，获取DataSource

import javax.sql.DataSource;

import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.jdbc.core.JdbcTemplate;

import com.alibaba.druid.spring.boot.autoconfigure.DruidDataSourceBuilder;

@Configuration
public class DataSourceConfig {
	@Primary
	@Bean(name = "mysqldatasource")
	@ConfigurationProperties("spring.datasource.druid.mysql")
	public DataSource dataSourceOne(){
	    return DruidDataSourceBuilder.create().build();
	}
	
	@Bean(name = "oracledatasource")
	@ConfigurationProperties("spring.datasource.druid.oracle")
	public DataSource dataSourceTwo(){
	    return DruidDataSourceBuilder.create().build();
	}

	@Bean(name = "mysqlJdbcTemplate")
	public JdbcTemplate primaryJdbcTemplate(
	        @Qualifier("mysqldatasource") DataSource dataSource) {
	    return new JdbcTemplate(dataSource);
	}
	
	@Bean(name = "oracleJdbcTemplate")
	public JdbcTemplate secondaryJdbcTemplate(
	        @Qualifier("oracledatasource") DataSource dataSource) {
	    return new JdbcTemplate(dataSource);
	}
}

3，贴 Service

@Service("studentService")
public class StudentServiceImp implements StudentService{
	@Autowired
	private OracleStudentDao oracleStudentDao;
	@Autowired
	private MysqlStudentDao mysqlStudentDao;
	
	@Override
	public List<Map<String, Object>> getAllStudentsFromOralce() {
		return this.oracleStudentDao.getAllStudents();
	}

	@Override
	public List<Map<String, Object>> getAllStudentsFromMysql() {
		return this.mysqlStudentDao.getAllStudents();
	}

}

4、贴mapper

import java.util.List;
import java.util.Map;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.stereotype.Repository;

import com.springboot.dao.MysqlStudentDao;

@Repository
public class MysqlStudentDaoImp implements MysqlStudentDao{

	@Autowired
	@Qualifier("mysqlJdbcTemplate")
	private JdbcTemplate jdbcTemplate;

	@Override
	public List<Map<String, Object>> getAllStudents() {
		return this.jdbcTemplate.queryForList("select * from student");
	}

}

-------------------------------------------------------------> 分割线 <-------------------------------------------------------------

第二种方式SessionFactory 多数据

1、配置文件同上
2、贴 oracle config

import javax.sql.DataSource;

import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.context.properties.ConfigurationProperties;
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 com.alibaba.druid.spring.boot.autoconfigure.DruidDataSourceBuilder;

@Configuration
@MapperScan(basePackages = OracleDatasourceConfig.PACKAGE, 
	sqlSessionFactoryRef = "oracleSqlSessionFactory")
public class OracleDatasourceConfig {
	
	// oracledao扫描路径
	static final String PACKAGE = "com.springboot.oracledao"; 
	// mybatis mapper扫描路径
	static final String MAPPER_LOCATION = "classpath:mapper/oracle/*.xml";
	
	@Bean(name = "oracledatasource")
	@ConfigurationProperties("spring.datasource.druid.oracle")
	public DataSource oracleDataSource() {
		return DruidDataSourceBuilder.create().build();
	}
	
	@Bean(name = "oracleTransactionManager")
    public DataSourceTransactionManager oracleTransactionManager() {
        return new DataSourceTransactionManager(oracleDataSource());
    }
 
    @Bean(name = "oracleSqlSessionFactory")
    public SqlSessionFactory oracleSqlSessionFactory(@Qualifier("oracledatasource") DataSource dataSource) throws Exception {
        final SqlSessionFactoryBean sessionFactory = new SqlSessionFactoryBean();
        sessionFactory.setDataSource(dataSource);
        //如果不使用xml的方式配置mapper，则可以省去下面这行mapper location的配置。
        sessionFactory.setMapperLocations(new PathMatchingResourcePatternResolver()
                .getResources(OracleDatasourceConfig.MAPPER_LOCATION));
        return sessionFactory.getObject();
    }
}

3、贴 mysqlconfig

import javax.sql.DataSource;

import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.context.properties.ConfigurationProperties;
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 com.alibaba.druid.spring.boot.autoconfigure.DruidDataSourceBuilder;

@Configuration
@MapperScan(basePackages = MysqlDatasourceConfig.PACKAGE, sqlSessionFactoryRef = "mysqlSqlSessionFactory")
public class MysqlDatasourceConfig {

	// mysqldao扫描路径
	static final String PACKAGE = "com.springboot.mysqldao";
	// mybatis mapper扫描路径
	static final String MAPPER_LOCATION = "classpath:mapper/mysql/*.xml";

	@Primary
	@Bean(name = "mysqldatasource")
	@ConfigurationProperties("spring.datasource.druid.mysql")
	public DataSource mysqlDataSource() {
		return DruidDataSourceBuilder.create().build();
	}

	@Bean(name = "mysqlTransactionManager")
	@Primary
	public DataSourceTransactionManager mysqlTransactionManager() {
		return new DataSourceTransactionManager(mysqlDataSource());
	}

	@Bean(name = "mysqlSqlSessionFactory")
	@Primary
	public SqlSessionFactory mysqlSqlSessionFactory(@Qualifier("mysqldatasource") DataSource dataSource)
			throws Exception {
		final SqlSessionFactoryBean sessionFactory = new SqlSessionFactoryBean();
		sessionFactory.setDataSource(dataSource);
		//如果不使用xml的方式配置mapper，则可以省去下面这行mapper location的配置。
		sessionFactory.setMapperLocations(
				new PathMatchingResourcePatternResolver().getResources(MysqlDatasourceConfig.MAPPER_LOCATION));
		return sessionFactory.getObject();
	}
}

4、贴 service

import java.util.List;
import java.util.Map;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import com.springboot.mysqldao.MysqlStudentMapper;
import com.springboot.oracledao.OracleStudentMapper;
import com.springboot.service.StudentService;

@Service("studentService")
public class StudentServiceImp implements StudentService{
	@Autowired
	private OracleStudentMapper oracleStudentMapper;
	@Autowired
	private MysqlStudentMapper mysqlStudentMapper;
	
	@Override
	public List<Map<String, Object>> getAllStudentsFromOralce() {
		return this.oracleStudentMapper.getAllStudents();
	}

	@Override
	public List<Map<String, Object>> getAllStudentsFromMysql() {
		return this.mysqlStudentMapper.getAllStudents();
	}

}

5、贴 mapper

@Mapper
public interface MysqlStudentMapper {
	List<Map<String, Object>> getAllStudents();
}

    
         
<mapper namespace="com.springboot.mysqldao.MysqlStudentMapper">  
    <select id="getAllStudents" resultType="java.util.Map">
        select * from student
    select>
mapper>