Get SQL a Django model has (or would call) on .save()
How can you get the SQL for a Django model's .save(), i.e.
from django.db import models
class MyM(models.Model):
text = models.TextField()
How can you get the SQL that would be created/used in the following scenario:
>>> m = MyM(text="123")
>>> m.save()
# What开发者_StackOverflow社区 SQL Django just run?
Thanks!
If you want get the insert statement for model before saving - you can use the following code (checked on django 1.4)
from django.db import connection
from django.db.models import sql
def object_to_query(objects):
if isinstance(objects, (list, tuple)
values = obj._meta.local_fields
q = sql.InsertQuery(obj)
q.insert_values(values, [obj])
compiler = q.get_compiler('default')
# Normally, execute sets this, but we don't want to call execute
setattr(compiler, 'return_id', False)
stmts = compiler.as_sql()
stmt = [stmt % params for stmt, params in stmts]
return stmt[0]
From the Django FAQ:
How can I see the raw SQL queries Django is running? Make sure your Django DEBUG setting is set to True. Then, just do this:
>>> from django.core.db import db
>>> db.queries
[{'sql': 'SELECT polls_polls.id,polls_polls.question,polls_polls.pub_date FROM polls_polls',
'time': '0.002'}]
db.queries is only available if DEBUG is True. It's a list of dictionaries in order of query execution. Each dictionary has the following:
sql
--The raw SQL statement
time
-- How long the statement took to execute, in seconds.
db.queries includes all SQL statements -- INSERTs, UPDATES, SELECTs, etc.
from django.db.models import sql, Model
from typing import List
def _escape_sql_param(param):
if type(param) is str:
return f"'{param}'"
return str(param)
# noinspection PyProtectedMember
def model_to_insert_sql(models: List[Model]):
fields = models[0]._meta.local_fields
q = sql.InsertQuery(models[0])
q.insert_values(fields, models)
compiler = q.get_compiler('default')
# Normally, execute sets this, but we don't want to call execute
setattr(compiler, 'return_id', False)
raw_statements = compiler.as_sql()
mixed_statements = [statement % tuple(_escape_sql_param(param) for param in params)
for statement, params in raw_statements]
return mixed_statements
Then call it such as
model_to_insert_sql([your_model_1, your_model_2])
for a bulk insert. If only want a single insert, call it as
model_to_insert_sql([your_model])
p.s. @Kerrigan's answer cannot compile, and does not work with string types...
Just run python manage.py sqlall APP_NAME
.
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