解决：Connections could not be acquired from the underlying database!

问题

Connections could not be acquired from the underlying database!

出错，最后发现我的mysql版本是8.x 导入的依赖是5.x版本

排查问题步骤：

1.查看 mysql 数据库中是否创建了相应的表

2.查看账号密码和driver信息是否输入正确

这个是5.x的版本的driver

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/test?serverTimezone=UTC
jdbc.username=root
jdbc.password=root

这个是8.x的版本的driver

jdbc.driver=com.mysql.cj.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf-8&serverTimezone=Asia/Shanghai
jdbc.username=root
jdbc.password=root

3.首先查看你的mysql版本,导入相应的依赖或者相应的jar包

cmd输入 MySQL -V

 <dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>8.0.21</version></dependency>
<!--    5.x版本-->
<!--    <dependency>-->
<!--      <groupId>mysql</groupId>-->
<!--      <artifactId>mysql-connector-java</artifactId>-->
<!--    <version>5.1.32</version>-->
<!--    </dependency>--><dependency><groupId>c3p0</groupId><artifactId>c3p0</artifactId><version>0.9.1.2</version></dependency>

4.数据库未启动或无权访问

5.远程访问时，mysql root没有访问的权限

解决：Connections could not be acquired from the underlying database!相关推荐

新手解决Connections could not be acquired from the underlying database!Java代码上传到服务器连接不上数据库
本人刚入门Java,最近在开发一个项目,由于项目中有些问题需要与客户沟通.就想着把程序先上传到服务器上,先是上传到我之前用的服务器,服务器没有配置Java 环境.我自己配置好环境后把编译后代码上传上去 ...
解决Connections could not be acquired from the underlying database!
之前一直认为是代码错了,后来网上查资料,发现可能是C3P0和mysql的版本不匹配导致的,更改完C3P0的版本以后就好了,更改完的版本如下: <dependency><groupI ...
解决：Connections could not be acquired from the underlying database！（mysql）
这两天一直有这个bug出现,记录一下解决方案和总结. 解决方案: 1.驱动配置错误(本人的bug) 2.数据库连接地址错误 3.账号密码错误 4.数据库未启动或者无权访问,如没有联网的情况下 5.版本 ...
SSM：出现Connections could not be acquired from the underlying database异常的解决
QUESTION:SSM:出现Connections could not be acquired from the underlying database异常的解决 ANSWER: 近期在学习ssm框 ...
Connections could not be acquired from the underlying database异常，已解决。
问题描述在运用JDBC连接数据库时,用的是C3P0数据源,出现Connections could not be acquired from the underlying database!这个异常 ...
【JDBC 报错】Connections could not be acquired from the underlying database!
项目启动报错: 1 [2016-07-13 10:04:15,074] ERROR org.apache.ibatis.executor.BaseExecutor Could not get a da ...
Hibernate 错误记录Connections could not be acquired from the underlying database!
Hibernate 错误记录Connections could not be acquired from the underlying database! 错误详情网上的解决办法我的错误解决错误 ...
Oracle 换库时发生 Connections could not be acquired from the underlying database
在进行数据库切换发生如下错误: Error querying database. Cause: org.springframework.jdbc.CannotGetJdbcConnectionExce ...
数据库连接问题Connections could not be acquired from the underlying database!
问题:Connections could not be acquired from the underlying database! 1.无法从底层数据库获取连接 1.1.首先日常打开自己的项目,运行 ...

解决：Connections could not be acquired from the underlying database!

问题

排查问题步骤：

1.查看 mysql 数据库中是否创建了相应的表

2.查看账号密码和driver信息是否输入正确

3.首先查看你的mysql版本,导入相应的依赖或者相应的jar包

4.数据库未启动或无权访问

5.远程访问时，mysql root没有访问的权限

解决：Connections could not be acquired from the underlying database!相关推荐

最新文章

热门文章

解决：Connections could not be acquired from the underlying database!

问题

排查问题步骤：

1.查看 mysql 数据库中是否创建了相应的表

2.查看账号密码和driver信息 是否输入正确

3.首先查看你的mysql版本,导入相应的依赖或者相应的jar包

4.数据库未启动或无权访问

5.远程访问时，mysql root没有访问的权限

解决：Connections could not be acquired from the underlying database!相关推荐

最新文章

热门文章

2.查看账号密码和driver信息是否输入正确