Django:show/log来自python shell的ORMSQL调用
使用优秀的SQL语句,我在代码中发现了各种有趣和意外的SQL调用。我想找到调用来自何处,因此我正在寻找一种方法来获取Python shell中Django ORM生成的所有SQL调用的日志或打印输出。也就是说,当我通过pythonshell执行Django-ORM调用时,我希望看到结果SQL打印出来或记录下来Django:show/log来自python shell的ORMSQL调用,django,orm,Django,Orm,使用优秀的SQL语句,我在代码中发现了各种有趣和意外的SQL调用。我想找到调用来自何处,因此我正在寻找一种方法来获取Python shell中Django ORM生成的所有SQL调用的日志或打印输出。也就是说,当我通过pythonshell执行Django-ORM调用时,我希望看到结果SQL打印出来或记录下来 我注意到有几种将日志信息添加到html页面的解决方案。是否有一种简单的方法可以将其转储到命令行?Rob Hudson's以及它的一般功能,还包括一个非常漂亮的debugsqlshellma
我注意到有几种将日志信息添加到html页面的解决方案。是否有一种简单的方法可以将其转储到命令行?Rob Hudson's以及它的一般功能,还包括一个非常漂亮的
debugsqlshell
manage.py命令,它可以实现这一点。如果您在shell中,或者在任何地方,您都可以使用queryset方法
query.as_sql()
打印SQL命令
即:
如果您真的很想查看/记录所有SQL查询,那么您应该尝试Django 1.3(目前在alpha中,但即将投入生产),它支持许多组件,包括数据库后端 当然,如果您一直在使用Django的稳定版本,您可以通过将以下内容添加到导入列表的底部来修补
Django/db/models/sql/compiler.py
,相对轻松地获得相同的效果:
import logging
_querylogger = logging.getLogger( 'sql.compiler' )
查找SQLCompiler::execute_sql()
方法并更改:
cursor = self.connection.cursor()
cursor.execute( sql, params )
为此:
cursor = self.connection.cursor()
_querylogger.info( "%s <= %s", sql, params )
cursor.execute( sql, params )
cursor=self.connection.cursor()
_querylogger.info(“%s如果您使用的是Django 1.3:
import logging
l = logging.getLogger('django.db.backends')
l.setLevel(logging.DEBUG)
l.addHandler(logging.StreamHandler())
我试图在生产服务器上的shell中使用“”,但它不起作用。最终有人指出,它只会在debug=True
时进行此调试日志记录。但您可以这样解决此问题:
import logging
from django.db import connection
connection.force_debug_cursor = True # Change to use_debug_cursor in django < 1.8
l = logging.getLogger('django.db.backends')
l.setLevel(logging.DEBUG)
l.addHandler(logging.StreamHandler())
导入日志
从django.db导入连接
connection.force_debug_cursor=True#更改为在django中使用_debug_cursor<1.8
l=logging.getLogger('django.db.backends'))
l、 setLevel(logging.DEBUG)
l、 addHandler(logging.StreamHandler())
我把这个放在这里,以便以后能找到它,希望它能像我一样为其他人节省时间。使用django扩展
pip install django-extensions
./manage.py shell_plus --print-sql
对于生产环境,由于调试设置,它可能无法工作。仅提及另一个选项-我制作了django sql sniffer
工具,以便它可以连接到任何正在运行的Python进程,并监视/分析来自django ORM的sql执行
因此,它还可以用于监视来自Python shell进程的查询(请参见第页的演示视频):
- 打开shell并获取进程ID:
- 在另一个选项卡中附加
django sql sniffer
(在本例中,指定跟踪实时查询的尾部模式)
- 返回shell并开始执行查询
- 该工具在执行原始查询时打印这些查询
- 最后,点击
Ctrl+C
停止该工具并对所有捕获的查询进行分析
您还可以执行>>>打印MyModel.objects.all()。查询使用Django 1.5和query.as_sql()
对我不起作用。query.sql\u with_params()
则起作用。在幕后查找调用的来源和进行的操作“我还建议使用Django Debug Toolbar。不仅适用于debugsqlshell命令,也适用于实际的工具栏,其中还包含大量有关SQL调用的信息。str(qs)工作也很好。如果我使用django 1.2呢?+1这也适用于django 1.5,你一辈子都在哪里?这对django 1.8仍然很有用。ruby on rails控制台默认启用了这种输出,我希望复制这种输出;太好了!我应该把这段代码放在settings.py?Noob中吗?请帮助。即使在在生产环境中,您可以运行settings.DEBUG=True
作为第一个Python shell_plus命令。如果Django生成的查询太长(这很可能是因为您的表只有几列),则shell将停止打印并继续执行。我看到的任何查询都不会到达WHERE子句。
import logging
from django.db import connection
connection.force_debug_cursor = True # Change to use_debug_cursor in django < 1.8
l = logging.getLogger('django.db.backends')
l.setLevel(logging.DEBUG)
l.addHandler(logging.StreamHandler())
pip install django-extensions
./manage.py shell_plus --print-sql
In [1]: import os
In [2]: os.getpid()
Out[2]: 99688
$ django-sql-sniffer -p 99688 -t
In [3]: cat library/models.py
from django.db import models
class Book(models.Model):
title = models.CharField(null=False, blank=False, max_length=100)
author = models.ForeignKey('Author', on_delete=models.CASCADE)
class Author(models.Model):
first_name = models.CharField(max_length=30)
last_name = models.CharField(max_length=30)
In [4]: from library.models import *
In [5]: books = Book.objects.all()
In [6]: len(books) # better use count
Out[6]: 121000
In [7]: book = books.first() # query set not ordered, will hit db again
In [8]: book = books.first() # query set not ordered, will hit db again
In [9]: book = books.first() # query set not ordered, will hit db again
In [10]: book.author.id # better use author_id
Out[10]: 1
In [11]: Book.objects.filter(author__first_name__startswith='A').count() > 0
Out[11]: True
In [12]: Book.objects.filter(author__first_name__startswith='A').exists()
Out[12]: True
Count: 1; Duration: 0.002211809; Max Duration: 0.002211809; Query:
SELECT "library_book"."id",
"library_book"."title",
"library_book"."author_id"
FROM "library_book"
-------------------------------------------------------
Count: 1; Duration: 0.000240326; Max Duration: 0.000240326; Query:
SELECT "library_book"."id",
"library_book"."title",
"library_book"."author_id"
FROM "library_book"
ORDER BY "library_book"."id" ASC
LIMIT 1
-------------------------------------------------------
Count: 2; Duration: 0.000150919; Max Duration: 0.000240326; Query:
SELECT "library_book"."id",
"library_book"."title",
"library_book"."author_id"
FROM "library_book"
ORDER BY "library_book"."id" ASC
LIMIT 1
-------------------------------------------------------
Count: 3; Duration: 0.000187874; Max Duration: 0.000240326; Query:
SELECT "library_book"."id",
"library_book"."title",
"library_book"."author_id"
FROM "library_book"
ORDER BY "library_book"."id" ASC
LIMIT 1
-------------------------------------------------------
Count: 1; Duration: 0.000919104; Max Duration: 0.000919104; Query:
SELECT "library_author"."id",
"library_author"."first_name",
"library_author"."last_name"
FROM "library_author"
WHERE "library_author"."id" = %s
LIMIT 21
-------------------------------------------------------
Count: 1; Duration: 0.040677071; Max Duration: 0.040677071; Query:
SELECT COUNT(*) AS "__count"
FROM "library_book"
INNER JOIN "library_author"
ON ("library_book"."author_id" = "library_author"."id")
WHERE "library_author"."first_name" LIKE %s ESCAPE '\'
-------------------------------------------------------
Count: 1; Duration: 0.002345800; Max Duration: 0.002345800; Query:
SELECT (1) AS "a"
FROM "library_book"
INNER JOIN "library_author"
ON ("library_book"."author_id" = "library_author"."id")
WHERE "library_author"."first_name" LIKE %s ESCAPE '\'
LIMIT 1
-------------------------------------------------------
=======================================================
____ ___ _ ____ _____ _ _____ ____
/ ___| / _ \ | | / ___||_ _| / \ |_ _|/ ___|
\___ \ | | | || | \___ \ | | / _ \ | | \___ \
___) || |_| || |___ ___) | | | / ___ \ | | ___) |
|____/ \__\_\|_____| |____/ |_|/_/ \_\|_| |____/
Django SQL Sniffer v1.0.0
=======================================================
TOP QUERIES BY MAX DURATION
Count: 1; Max Duration: 0.040677071; Combined Duration: 0.040677071; Query:
SELECT COUNT(*) AS "__count"
FROM "library_book"
INNER JOIN "library_author"
ON ("library_book"."author_id" = "library_author"."id")
WHERE "library_author"."first_name" LIKE %s ESCAPE '\'
-------------------------------------------------------
Count: 1; Max Duration: 0.002345800; Combined Duration: 0.002345800; Query:
SELECT (1) AS "a"
FROM "library_book"
INNER JOIN "library_author"
ON ("library_book"."author_id" = "library_author"."id")
WHERE "library_author"."first_name" LIKE %s ESCAPE '\'
LIMIT 1
-------------------------------------------------------
Count: 1; Max Duration: 0.002211809; Combined Duration: 0.002211809; Query:
SELECT "library_book"."id",
"library_book"."title",
"library_book"."author_id"
FROM "library_book"
-------------------------------------------------------
=======================================================