'Build your Own ORM from Scratch With Python' python model
class ConnectionSqliteManager: def __init__: self.filename=filename def __enter__: print self.connection=sql3.connect self.cursor=self.connection.cursor return self def __exit__: print self.connection.close with ConnectionSqliteManager as Connection: # Do what you want with Connection instance, you manage the database within the scope, without taking the bother of opening and closing the connection manager.Never forget to add some sqlite3 error exception in each command execution.
#inside ConnectionSqliteManager class def commit: def wrapper: operation self.connection.commit return wrapper @commit def Sql_operation: # execute an sql command here passis a Python class that inherits from theclass. The model class defines a new kind of datastore entity and the properties the kind is expected to take.
I won’t dive into too much implementation here. all you have to do is to define a model class like the following:In this code, you need to specify the name of the table of the database and its fields.model_list=[Model, ]Now let’s prepare the user for a good interface in our command prompt. To implement it, we used thelibrary to let the user input the arguments in the command prompt and execute the migration., there is no need to explain each line of code. I made it as simple as possible.
Begin database Migration ... Model Migration Connection started ... Model: created successfully! 2022-01-04 02:29:53.402991: Commit is successful!! Connection ended ...It’s good to implement a technique like ORM from scratch, it will help you understand and learn technologies quickly without any difficulties in grasping the concept behind it.
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