是否有一种方法可以在执行查询时显示Django正在运行的SQL ?
当前回答
如果你确保你的settings.py文件有:
django.core.context_processors.debug中列出的 DEBUG = True INTERNAL_IPS元组中的IP
然后您应该可以访问sql_queries变量。我在每个页面上都添加了一个页脚,如下所示:
{%if sql_queries %}
<div class="footNav">
<h2>Queries</h2>
<p>
{{ sql_queries|length }} Quer{{ sql_queries|pluralize:"y,ies" }}, {{sql_time_sum}} Time
{% ifnotequal sql_queries|length 0 %}
(<span style="cursor: pointer;" onclick="var s=document.getElementById('debugQueryTable').style;s.disp\
lay=s.display=='none'?'':'none';this.innerHTML=this.innerHTML=='Show'?'Hide':'Show';">Show</span>)
{% endifnotequal %}
</p>
<table id="debugQueryTable" style="display: none;">
<col width="1"></col>
<col></col>
<col width="1"></col>
<thead>
<tr>
<th scope="col">#</th>
<th scope="col">SQL</th>
<th scope="col">Time</th>
</tr>
</thead>
<tbody>
{% for query in sql_queries %}
<tr class="{% cycle odd,even %}">
<td>{{ forloop.counter }}</td>
<td>{{ query.sql|escape }}</td>
<td>{{ query.time }}</td>
</tr>
{% endfor %}
</tbody>
</table>
</div>
{% endif %}
通过添加一行,我得到了变量sql_time_sum
context_extras['sql_time_sum'] = sum([float(q['time']) for q in connection.queries])
到django_src/django/core/context_processors.py中的debug函数。
其他回答
这里已经有几个很好的答案了。
还有一种方法。
在测试中,这样做:
with self.assertNumQueries(3):
response = self.client.post(reverse('payments:pay_list'))
# or whatever
如果查询数量错误,则测试失败,并在控制台中打印所有原始SQL查询。
此外,此类测试有助于控制SQL查询的数量不会随着代码的更改而增加,并且数据库负载不会过多。
如果您需要为一些自定义SQL重用查询,还有另一种非常有用的方法。我曾在一个分析应用程序中使用过这种方法,它远远超出了Django的ORM所能轻松完成的范围,所以我将ORM生成的SQL作为子查询包含进来。
from django.db import connection
from myapp.models import SomeModel
queryset = SomeModel.objects.filter(foo='bar')
sql_query, params = queryset.query.as_sql(None, connection)
这将为您提供带有占位符的SQL,以及可以使用的带有查询参数的元组。你可以直接把它传递给DB:
with connection.connection.cursor(cursor_factory=DictCursor) as cursor:
cursor.execute(sql_query, params)
data = cursor.fetchall()
从django获取查询结果到数据库(使用正确的参数替换) 你可以使用这个函数:
from django.db import connection
def print_database_query_formatted(query):
sql, params = query.sql_with_params()
cursor = connection.cursor()
cursor.execute('EXPLAIN ' + sql, params)
db_query = cursor.db.ops.last_executed_query(cursor, sql, params).replace('EXPLAIN ', '')
parts = '{}'.format(db_query).split('FROM')
print(parts[0])
if len(parts) > 1:
parts = parts[1].split('WHERE')
print('FROM{}'.format(parts[0]))
if len(parts) > 1:
parts = parts[1].split('ORDER BY')
print('WHERE{}'.format(parts[0]))
if len(parts) > 1:
print('ORDER BY{}'.format(parts[1]))
# USAGE
users = User.objects.filter(email='admin@admin.com').order_by('-id')
print_database_query_formatted(users.query)
输出示例
SELECT "users_user"."password", "users_user"."last_login", "users_user"."is_superuser", "users_user"."deleted", "users_user"."id", "users_user"."phone", "users_user"."username", "users_user"."userlastname", "users_user"."email", "users_user"."is_staff", "users_user"."is_active", "users_user"."date_joined", "users_user"."latitude", "users_user"."longitude", "users_user"."point"::bytea, "users_user"."default_search_radius", "users_user"."notifications", "users_user"."admin_theme", "users_user"."address", "users_user"."is_notify_when_buildings_in_radius", "users_user"."active_campaign_id", "users_user"."is_unsubscribed", "users_user"."sf_contact_id", "users_user"."is_agree_terms_of_service", "users_user"."is_facebook_signup", "users_user"."type_signup"
FROM "users_user"
WHERE "users_user"."email" = 'admin@admin.com'
ORDER BY "users_user"."id" DESC
它基于这个票证评论:https://code.djangoproject.com/ticket/17741#comment:4
你可以使用连接。在Django中运行原始SQL查询,如下所示:
# "store/views.py"
from django.db import transaction
from .models import Person
from django.db import connection
from django.http import HttpResponse
@transaction.atomic
def test(request):
Person.objects.create(name="John") # INSERT
qs = Person.objects.select_for_update().get(name="John") # SELECT FOR UPDATE
qs.name = "Tom"
qs.save() # UPDATE
qs.delete() # DELETE
for query in connection.queries: # Here
print(query)
return HttpResponse("Test")
然后,原始查询打印在控制台,如下所示:
{'sql': 'INSERT INTO "store_person" ("name") VALUES (\'John\') RETURNING "store_person"."id"', 'time': '0.000'}
{'sql': 'SELECT "store_person"."id", "store_person"."name" FROM "store_person" WHERE "store_person"."name" = \'John\' LIMIT 21 FOR UPDATE', 'time': '0.000'}
{'sql': 'UPDATE "store_person" SET "name" = \'Tom\' WHERE "store_person"."id" = 179', 'time': '0.000'}
{'sql': 'DELETE FROM "store_person" WHERE "store_person"."id" IN (179)', 'time': '0.000'}
[24/Dec/2022 06:29:32] "GET /store/test/ HTTP/1.1" 200 9
然后,把reset_queries()放在Person.objects.select_for_update()之后,如果你想只得到UPDATE和DELETE查询,而没有INSERT和SELECT FOR UPDATE查询,如下所示:
# "store/views.py"
from django.db import transaction
from .models import Person
from django.db import reset_queries
from django.db import connection
from django.http import HttpResponse
@transaction.atomic
def test(request):
Person.objects.create(name="John") # INSERT
qs = Person.objects.select_for_update().get(name="John") # SELECT FOR UPDATE
reset_queries() # Here
qs.name = "Tom"
qs.save() # UPDATE
qs.delete() # DELETE
for query in connection.queries: # Here
print(query)
return HttpResponse("Test")
然后,只打印UPDATE和DELETE查询,不打印INSERT和SELECT FOR UPDATE查询,如下所示:
{'sql': 'UPDATE "store_person" SET "name" = \'Tom\' WHERE "store_person"."id" = 190', 'time': '0.000'}
{'sql': 'DELETE FROM "store_person" WHERE "store_person"."id" IN (190)', 'time': '0.000'}
[24/Dec/2022 07:00:01] "GET /store/test/ HTTP/1.1" 200 9
对于Django 2.2:
当我使用。/manage.py shell时,大多数答案对我没有多大帮助。最后我找到了答案。希望这能对别人有所帮助。
查询所有查询信息。
from django.db import connection
connection.queries
查看单个查询的查询:
q=Query.objects.all()
q.query.__str__()
q。query只是为我显示对象。 使用__str__()(字符串表示)显示完整的查询。
推荐文章
- 证书验证失败:无法获得本地颁发者证书
- 当使用pip3安装包时,“Python中的ssl模块不可用”
- 无法切换Python与pyenv
- Python if not == vs if !=
- 如何在Ruby On Rails中使用NuoDB手动执行SQL命令
- 查询JSON类型内的数组元素
- 如何在django应用程序中显示favicon ?
- 如何从scikit-learn决策树中提取决策规则?
- 为什么在Mac OS X v10.9 (Mavericks)的终端中apt-get功能不起作用?
- 确定记录是否存在的最快方法
- 将旋转的xtick标签与各自的xtick对齐
- 为什么元组可以包含可变项?
- 如何合并字典的字典?
- 获得PostgreSQL数据库中当前连接数的正确查询
- 如何创建类属性?