Cannot invoke “java.sql.Connection.prepareStatement(String)“because “this.conn“ is null
就是jar包太老了,資料庫是新版本的,用8以上的connector
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Cannot invoke “java.sql.Connection.prepareStatement(String)“because “this.conn“ is null
就是jar包太老了,資料庫是新版本的,用8以上的connector
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