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问题1: Another app is currently holding the yum lock; waiting for it to exit... The other application is: yum Memory : 111 M RSS (432 MB VSZ) Started: W 阅读全文
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使用FileInputStream一切正常,切换为使用classpath从jar包读取getResourceAsStream一直报如下错误 javax.crypto.BadPaddingException: Given final block not properly padded 经过多种尝试,是 阅读全文
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and优先级高于or, 不使用()情形:or后仍遇到and时,先算and再算or select * from table1 where f1=1 and f2=2 or f3=3 and f4=4 or f5=5 等价于 select * from table1 where (f1=1 and f2 阅读全文