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Ii. Summary of Knowledge points When the model query APIs don ' t go far enough, you can fall back to writing raw SQL. Go far enough: not enough fall back to: HelpRaw: Raw, unprocessed Django provides two ways of executing

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Directory1. Introduction of test environment2. Backup strategy3. Backup4. Disaster recovery5. Summary1. Introduction of Test ringMysql> select version (); +------------+| version ()   |+------------+| 5.5.36- log |+------------+mysql> show databases;

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Exception handlingExceptions (exception) are problems that occur during the execution of a programException classification:1 Checking for exceptions2 Running exceptions3 ErrorThere are three ways to handle exceptions:1. Catch the exception so that

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