文章浏览阅读812次。连接oracle数据库一直报：ORA-12505, TNS:listener does not currently know of SID given in connect descriptor数据库配置如下：#数据库的地址以及端口号 spring.datasource.zzymoracle.driver-class-name=oracle.jdbc.driver.OracleDriverspring.datasource.zzy......

文章浏览阅读2.5w次，点赞22次，收藏20次。使用php 查询数据库中的数据时，出现了： Warning: mysqli_fetch_assoc() expects parameter 1 to be mysqli_result, bool given in.......因为刚开始使用select * from 表名;的时候没有问题，但是后来加了约束条件......

文章浏览阅读6.4k次，点赞2次，收藏3次。The given artifact contains a string literal with a package reference 'android.support.v4.content' that cannot be safely rewritten. Libraries using reflection such as annotation processors need to be updated manually to add support for androidx.......

文章浏览阅读8k次。问题写sparksql语句时出现的错误，他说该字段不在表中Exception in thread "main" org.apache.spark.sql.AnalysisException: cannot resolve '`Class`' given input columns: [Cno, Cnam, Tno]; line 1 pos 28;'Project [*]+- 'Filter..._mysql中的sql语句......