这个怎么弄？？？？？

Question

org.springframework.jdbc.UncategorizedSQLException: Hibernate operation: Cannot open connection; uncategorized SQLException for SQL [???]; SQL state [null]; error code [0]; Connections could not be acquired from the underlying database!; nested exception is java.sql.SQLException: Connections could not be acquired from the underlying database!

Answer 1

以上问题可能有一下原因造成：
1，驱动配置有误：driver=com.mysql.jdbc.Driver //oracle则写其对应驱动
2，数据库连接地址有误：url=jdbc:mysql://localhost:3306/test?haracterEncoding=utf8 //oracle则为：url=jdbc:oracle:thin:@localhost:1521:test
3，密码或帐号有误：username=root
password=root
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.jar
6,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;