java代码实现数据源切换(连接池简单粗暴)

--最佳实践配置(.yml)

gs.oracle:
#driverClassName: oracle.jdbc.driver.OracleDriver
driverClassName: oracle.jdbc.OracleDriver
username: myuser
password: root
url: jdbc:oracle:thin:@127.0.0.1:1521:orcl

 

--最佳实践(注意在springboot的.yml中配置gs.oracle,若使用gs_oracle,@@ConfigurationProperties会提示使用规范配置)

package com.dhht.config;

import lombok.Data;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;

/**
* @Author: sh
* @Description: oracleDataCfg 前置数据库配置类
* @Date: 9:26 2019/7/23
*/
@Component
@ConfigurationProperties(prefix = "gs.oracle")
@Data
public class OrcaleDataCfg {

private String driverClassName;
private String username;
private String password;
private String url;
}

 

--最佳实践DbConnect

package com.dhht.wechat.util;

import com.alibaba.druid.pool.DruidDataSource;
import com.dhht.config.OrcaleDataCfg;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.stereotype.Component;

import javax.annotation.Resource;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.util.Date;
import java.util.List;
import java.util.Map;

/**
* @Author: sh
* @Description: DbConnect
* @Date: 23:01 2019/7/22
*/
@Component
public class DbConnect {

@Resource
OrcaleDataCfg orcaleDataCfg;

private static DruidDataSource dataSource = null;
private static JdbcTemplate jdbcTemplate = null;

/**
* 构造函数完成数据库的连接和连接对象的生成
*
* @throws Exception
*/
private DbConnect() {

}

public synchronized DruidDataSource GetDbConnect() throws Exception {
try {
if (dataSource == null) {
dataSource = new DruidDataSource();
//设置连接参数
dataSource.setUrl(orcaleDataCfg.getUrl());
dataSource.setDriverClassName(orcaleDataCfg.getDriverClassName());
dataSource.setUsername(orcaleDataCfg.getUsername());
dataSource.setPassword(orcaleDataCfg.getPassword());
//配置初始化大小、最小、最大
dataSource.setInitialSize(5);
dataSource.setMinIdle(5);
dataSource.setMaxActive(5);
//连接泄漏监测
dataSource.setRemoveAbandoned(true);
dataSource.setRemoveAbandonedTimeout(30);
//配置获取连接等待超时的时间
dataSource.setMaxWait(20000);
//配置间隔多久才进行一次检测,检测需要关闭的空闲连接,单位是毫秒
dataSource.setTimeBetweenEvictionRunsMillis(20000);
//防止过期,Oracle必须添加 FROM DUAL!
dataSource.setValidationQuery("SELECT 'x' FROM DUAL");
dataSource.setTestWhileIdle(true);
dataSource.setTestOnBorrow(true);
return dataSource;
}
} catch (Exception e) {
return null;
}
return null;
}

/**
* 取得已经构造生成的数据库连接
*
* @return 返回数据库连接对象
* @throws Exception
*/
public Connection getConnect() throws Exception {
Connection con = null;
try {
GetDbConnect();
con = dataSource.getConnection();
} catch (Exception e) {
throw e;
}
return con;
}

public synchronized JdbcTemplate getJdbcTemplate() throws Exception{
DruidDataSource druidDataSource = GetDbConnect();
if(jdbcTemplate==null){
jdbcTemplate = new JdbcTemplate();
jdbcTemplate.setDataSource(druidDataSource);
}
return jdbcTemplate;
}


public static void main(String[] args) throws Exception {
DbConnect dbConnect = new DbConnect();
Connection connection = dbConnect.getConnect();
String sql = "SELECT * from DZHY_GAYZ_KZLOG";
PreparedStatement ps = connection.prepareStatement(sql);
ResultSet resultSet = ps.executeQuery();
if (resultSet.next()) {
System.out.println(resultSet.getInt(1));
}
JdbcTemplate jdbcTemplate = new JdbcTemplate();
jdbcTemplate.setDataSource(dataSource);
List> list = jdbcTemplate.queryForList(sql);
String SQL = "insert into DZHY_GAYZ_KZLOG (id,uniscid,entname,startdate,enddate,kz_uniscid,kz_entname) values (?,?,?,?,?,?,?)";
jdbcTemplate.update(SQL,DateUtil.get32UUIDMilli(),"333","需要刻章33",new Date(),new Date(),"33-33","刻章店33");
}
}

转载于:https://www.cnblogs.com/sung1024/p/11240139.html

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