How to operate JDBC encapsulating mysql

Yes, I copied this from my OneNote again, so it turned into a very long picture. What can I do? I am also desperate. If you are interested, just watch it.

Nowadays, development projects basically use frameworks (hibernate or mybatis) for the persistence layer, so this thing is basically not used. Since some masters have encapsulated it very well, why should we write it ourselves? However,

This can help us understand jdbc well. You can often understand better and quickly when using other people's frameworks.

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