数据库连接失败:Connections could not be acquired from the underlying database!
2018-04-11 21:13
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可能解决该问题的办法有:1,驱动配置有误:driver=com.mysql.jdbc.Driver
2,数据库连接地址有误:url=jdbc:mysql://localhost:3306/test?3useUnicode=true&characterEncoding=utf8
3,密码或帐号有误:username=root password=root(上面三条一般都写在配置文件中,如果是因为修改了配置文件后导致该错误,建议重写一遍配置文件,因为有时候开发工具就是很蛋疼,表面没有错误,程序运行却提示报错)4,数据库未启动或无权访问5,项目未引入对应的驱动jar包mysql-connector-java-5.1.6-bin.jar6,mysql root没有远程访问的权限,需要增加权限,增加权限的步骤如下:
进入mysql数据库:
grant all privileges on *.* to 'root'@'%' identified by 'root' with grant option;
flush privileges;7.在普通java项目中使用 mybatis+C3p0+spring时也遇见上述问题。
问题原因是:在xml配置文件中显示声明了自动装载 <beans default-autowire="byName"> 几经折腾,把自动装载设置去掉,就没有问题了,应该使用默认的 byType。
参考的文章http://jyao.iteye.com/blog/1915561
2,数据库连接地址有误:url=jdbc:mysql://localhost:3306/test?3useUnicode=true&characterEncoding=utf8
3,密码或帐号有误:username=root password=root(上面三条一般都写在配置文件中,如果是因为修改了配置文件后导致该错误,建议重写一遍配置文件,因为有时候开发工具就是很蛋疼,表面没有错误,程序运行却提示报错)4,数据库未启动或无权访问5,项目未引入对应的驱动jar包mysql-connector-java-5.1.6-bin.jar6,mysql root没有远程访问的权限,需要增加权限,增加权限的步骤如下:
进入mysql数据库:
grant all privileges on *.* to 'root'@'%' identified by 'root' with grant option;
flush privileges;7.在普通java项目中使用 mybatis+C3p0+spring时也遇见上述问题。
问题原因是:在xml配置文件中显示声明了自动装载 <beans default-autowire="byName"> 几经折腾,把自动装载设置去掉,就没有问题了,应该使用默认的 byType。
参考的文章http://jyao.iteye.com/blog/1915561
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