jdbctemplate 多数据源

1.数据源配置

spring:
    #    jdbctemplate 连接多数据源配置
  db1:
    datasource:
      jdbcurl: jdbc:mysql://127.0.0.1:3306/cloud-main1?useUnicode=true&characterEncoding=utf8&useSSL=false&allowMultiQueries=true
      username: root
      password: 123456
      driver-class-name: com.mysql.jdbc.Driver
      type: com.alibaba.druid.pool.DruidDataSource
  db2:
    datasource:
      jdbcurl: jdbc:mysql://127.0.0.1:3306/cloud-main2?useUnicode=true&characterEncoding=utf8&useSSL=false&allowMultiQueries=true
      username: root
      password: 123456
      driver-class-name: com.mysql.jdbc.Driver
      type: com.alibaba.druid.pool.DruidDataSource

2.启动类

@SpringBootApplication(exclude = DataSourceAutoConfiguration.class)

3.config  配置datasource

package com.example.demo.jdbctemplate.config;

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 javax.sql.DataSource;

@Configuration
public class DataSourceConfig {

    @Primary //（主数据源配置）
    @Bean(name = "db1")
    @Qualifier("db1")
    @ConfigurationProperties(prefix = "spring.db1.datasource")
    public DataSource mysqlDataSource(){

        return DataSourceBuilder.create().build();
    }

    //
    @Bean(name = "db2")
    @Qualifier("db2")
    @ConfigurationProperties(prefix = "spring.db2.datasource")
    public DataSource sqlServerDataSource(){

        return DataSourceBuilder.create().build();
    }
}

构造 db1JdbcTemplate、　　db2JdbcTemplate

package com.example.demo.jdbctemplate.config;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.context.annotation.Bean;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.stereotype.Component;
import org.springframework.stereotype.Repository;

import javax.sql.DataSource;

@Repository
public class DBLoader {
    @Bean(name = "db1JdbcTemplate")
    public JdbcTemplate primaryJdbcTemplate(@Qualifier("db1") DataSource dataSource) {
        return new JdbcTemplate(dataSource);
    }

    @Bean(name = "db2JdbcTemplate")
    public JdbcTemplate secondaryJdbcTemplate(@Qualifier("db2") DataSource dataSource) {
        return new JdbcTemplate(dataSource);
    }

}

　　4.调用

@Service
public class DBTools {
    @Autowired
    @Qualifier( "db1JdbcTemplate")
    private  JdbcTemplate jdbcTemplate1;
    @Autowired
    @Qualifier("db2JdbcTemplate")
    private  JdbcTemplate jdbcTemplate2 ;

    JdbcTemplate jdbcTemplate;

    public  JdbcTemplate getDB(String db  ) {
        if("db1".equals(db)){
            return  jdbcTemplate1;
        }else if ("db2".equals(db)){
            return  jdbcTemplate2;
        }else {
            return null ;
        }

    }

    /***
     * 查询
     * @param sql
     * @return 返回list
     */
    public   List<Map<String, Object>> queryForList(String db,String sql ) {
        List<Map<String, Object>> queryForList =  getDB(db).queryForList(sql );
        return  queryForList;
    }
}