django执行原生SQL查询的实现

Manager.raw(raw_query, params=None, translations=None)

class Person(models.Model):
    first_name = models.CharField(...)
    last_name = models.CharField(...)
    birth_date = models.DateField(...)

for p in Person.objects.raw('SELECT * FROM app_person'): # django默认的表名是app名加类名
    print(p)
​# 没有查询到就报错

Person.objects.raw('SELECT id, first_name, last_name, birth_date FROM app_person')

Person.objects.raw('SELECT last_name, birth_date, first_name, id FROM app_person')

>>> Person.objects.raw('''SELECT first AS first_name,
...                              last AS last_name,
...                              bd AS birth_date,
...                              pk AS id,
...                       FROM app_person''')

>>> name_map = {'first': 'first_name', 'last': 'last_name', 'bd': 'birth_date', 'pk': 'id'}
>>> Person.objects.raw('SELECT * FROM some_other_table', translations=name_map)

>>> first_person = Person.objects.raw('SELECT * FROM app_person')[0]

>>> lname = 'Doe'
>>> Person.objects.raw('SELECT * FROM myapp_person WHERE last_name = %s', [lname])

from django.db import connection
​
def my_sql(self):
    with connection.cursor() as cursor:
        cursor.execute("UPDATE bar SET foo = 1 WHERE baz = %s", [self.baz])
        cursor.execute("SELECT foo FROM bar WHERE baz = %s", [self.baz])
        row = cursor.fetchone()
​
    return row

cursor.execute("SELECT foo FROM bar WHERE baz = '30%%' AND id = %s", [self.id])

from django.db import connections
with connections['my_db_alias'].cursor() as cursor: