解決Connections could not be acquired from the underlying database!問題
搭建自定義持久層框架出現的問題 解決方案： 驅動配置有誤：driver=com.mysql.cj.jdbc.Driver 在mysql8.0.xx的版本中需要在驅動配置中添加cj 數據庫連接地址有誤：url=jdbc:mysql://localhost:3306/zdy_mybatis?3useUnicode=true&characterEncoding=utf8 密碼或帳號有誤：username
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- 1. java.sql.SQLException: Connections could not be acquired from the underlying database!
- 2. hibernate Connections could not be acquired from the underlying database!
- 3. Connections could not be acquired from the underlying database!
- 4. 解決：Connections could not be acquired from the underlying database!
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