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A simple ORM MySQL operation Library, running on Python3.

Project description

mysqlorm

TL:DR

A simple ORM MySQL operation Library, running on Python3. Automatic long connection,support chain call, more secure statement generation and the MySQL query can be constructed more elegantly.

Installation

Install via pip

(sudo) pip(3) install mysqlorm

Usage

Begin by importing the mysqlorm module:

from mysqlorm import ORMModel, MySQLConnect

You need to link the database before use:

mysql_connect_config = {
    "host": "host",
    "user": "user",
    "passwd": "passwd",
    "db": "db",
}
MySQLConnect.connect(mysql_connect_config)

Create a class to inherit ormmodel and set table_name attribute: (If no table_name attribute is set, use the lowercase class name by default.)

class ExampleModel(ORMModel):
    table_name = "exampletable"

Insert:

ExampleModel.insert({"field1": "value1", "field2", "value2"}) # single insert
ExampleModel.insert(( # batch insert, can use tuple or list
    {"field1": "value1", "field2", "value2"}, 
    {"field1": "value1", "field2", "value2"}))

Where:

# Support call chaining.
# The `where` method can pass 2 or 3 parameters.
# If two parameters are passed, the comparison symbol uses the equal sign by default.
# Call chaining use `and` connection condition, you must use `orWhere` method to `or` condition
ExampleModel.where("field", "value").where("field", ">", "value")
ExampleModel.where("field", "value").orWhere("field", ">", "value")
# Support batch afferent condition, can use tuple or list.
# Use `and` connection condition
ExampleModel.where((("filed1", "value1"), ("filed2", "value2")))
# Support aggregation condition query.
# Or you can use lambda method.
def condition(query):
    return query.where("field", "value").where("field1", ">", "value")

ExampleModel.where(condition).orWhere(
    lambda query: return query.where("field", "value").where("field1", "<", "value")
)
# The `like` condition uses the "LOCATE()" implementation.
# because the `%` symbol is a special symbol in Python will cause some problems. 
# So do not pass in the `where` method the parameter with the `%` symbol.
ExampleModel.where("file", 'like', "value")
# You can use `whereIn` and `whereNotIn` method.
# Can use tuple or list.
ExampleModel.whereIn("field", TupleOrList).whereNotIn("field", TupleOrList)
# You can use `whereBetween` and `whereNotBetween`.
ExampleModel.whereBetween("field", "from_condition", "to_condition"
    ).whereNotBetween("field", "from_condition", "to_condition")
# You can use `whereNull` and `whereNotNull`.
ExampleModel.whereNull("field1").whereNotNull("field2")

Query:

# You can use `select` method to defining query fields.
# If a parameter is not passed, use by default `*`.
# The default is to query `id`.
# Or can not use `select` method.
query = ExampleModel.select("field1", "field2", "field3")# n field parameters can be passed in.
# All queries support the `where` method conditional queries.
query.where("field", "value")
# You can use `when` method.
# Execute the query when the value is true or skip.
# The second parameter can be a function, like the use of the `where` method.
import random
a = random.choice(range(1, 10))
b = random.choice(range(1, 10))
query.when(a != b, condition).when(a == b, lambda query: return query.where("field", "value"))
# You can use `orderBy` method to sort resault.
# The `orderBy` method can pass 1 or 2 parameters.
# If one parameter passed, use 'ASC' by default.
query.orderBy("field")
# You can use `groupBy` method
# But you must pay attention to the problems caused by `sql_mode=only_full_group_by`
query.groupBy("field")
# You can use `limit` method
# The `where` method can pass 1 or 2 parameters.
# If one parameter is passed, offer use 0 by default.
query.limit(0, 10)
# The query returns are all model instances.
# Can easy to operate on a single instance.
query.all() # to get all data
query.find(1) # to find data from id
query.get() # to get data what query according to conditions
query.first() # to get first raw data what query according to conditions

Update:

# The `update` method supports the `where` conditions.
ExampleModel.update({"field1": "value1", "field2", "value2"}) # batch update
ExampleModel.where("field", "value").update({"field1": "value1"})

Delete:

# The `delete` method supports the `where` conditions.
ExampleModel.where("field", "value").delete()

ORMModel:

# ORMModel instances can be operated on a variety of operations.
# You can get a ormmodel instance in this way:
example = ExampleModel(attributes=attr) # attr must be a dict that matches the database field
# You can use the `save` method to insert data.
example.save()
# You can use the `save` method to update data or use the `delete` method to delete data.
# But the instances must from query resault.
example = ExampleModel.find(1)
example.field = "new value"
example.save() # update data
example.delete() # delete data
# Converting ormmodel instances to dict with `dict` method
example.dict()

TODO

  • Perfect the join table query.
  • Add more functions for ormmodel.
  • Increase the association between ormmodel.

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