I am little new to Django,
My Question is How do i do %LIKE% of MYSQL in Django Filter
Want something like this
myModel.objects.filter(myField__**like**="xyz")
as we can do
myModel.objects.filter(myField__startswith="xyz")
for strings that starts with 'xyz' but i want to match anywhere in the myField content.
What i know
it can be done by REGEX and .extra() but i want something very straight forward.
Thanks in advance.
You can do it like this:
myModel.objects.filter(myField__contains = "xyz")
Note: __contains is case sensitive. You can use __icontains if you don't care about the case of the text.
Use the contains operator my_model.objects.filter(my_field__contains='xyz') and icontains if you want case insensitivity
Related
I'm trying to find a regex expression in python that will be able to handle most of the UPDATE queries that I throw at if from my DB. I can't use sqlparse or any other libraries that may be useful with for this, I can only use python's built-in modules or cx_Oracle, in case it has a method I'm not aware of that could do something like this.
Most update queries look like this:
UPDATE TABLE_NAME SET COLUMN_NAME=2, OTHER_COLUMN=to_date('31-DEC-202023:59:59','DD-MON-YYYYHH24:MI:SS'), COLUMN_STRING='Hello, thanks for your help', UPDATED_BY=-100 WHERE CODE=9999;
Most update queries I use have a version of these types of updates. The output has to be a list including each separate SQL keyword (UPDATE, SET, WHERE), each separate update statement(i.e COLUMN_NAME=2) and the final identifier (CODE=9999).
Ideally, the result would look something like this:
list = ['UPDATE', 'TABLE_NAME', 'SET', 'COLUMN_NAME=2', 'OTHER_COLUMN=("31-DEC-2020 23:59:59","DD-MON-YYYY HH24:MI:SS")', COLUMN_STRING='Hello, thanks for your help', 'UPDATED_BY=-100', 'WHERE', 'CODE=9999']
Initially I tried doing this using a string.split() splitting on the spaces, but when dealing with one of my slightly more complex queries like the one above, the split method doesn't deal well with string updates such as the one I'm trying to make in COLUMN_STRING or those in OTHER_COLUMN due to the blank spaces in those updates.
Let's use the shlex module :
import shlex
test="UPDATE TABLE_NAME SET COLUMN_NAME=2, OTHER_COLUMN=to_date('31-DEC-202023:59:59','DD-MON-YYYYHH24:MI:SS'), COLUMN_STRING='Hello, thanks for your help', UPDATED_BY=-100 WHERE CODE=9999;"
t=shlex.split(test)
Up to here, we won't get rid of comma delimiters and the last semi one, so maybe we can do this :
for i in t:
if i[-1] in [',',';']:
i=i[:-1]
If we print every element of that list we'll get :
UPDATE
TABLE_NAME
SET
COLUMN_NAME=2
OTHER_COLUMN=to_date(31-DEC-202023:59:59,DD-MON-YYYYHH24:MI:SS)
COLUMN_STRING=Hello, thanks for your help
UPDATED_BY=-100
WHERE
CODE=9999
Not a proper generic answer, but serves the purpose i hope.
I am trying to apply a model filter on a JSONField BUT the keys in the JSON are UUIDs.
So when is do something like...
MyModel.objects.filter(data__8d8dd642-32cb-48fa-8d71-a7d6668053a7=‘bob’)
... I get a compile error. The hyphens in the UUID are the issue.
Any clues if there is an escape char or another behaviour to use? My database is PostgreSQL.
Update 1 - now with added JSON
{
‘8d8dd642-32cb-48fa-8d71-a7d6668053a7’: ’8d8dd642-32cb-48fa-8d71-a7d6668053a7’,
‘9a2678c4-7a49-4851-ab5d-6e7fd6d33d72’: ‘John Smith’,
‘9933ae39-1a27-4477-a9f4-3d1839f93fb4’: ‘Employee’
}
I was having this same issue where I couldn't use __contains, and found that you can use **kwargs unpacking to get it to work, which allows you to pass the filter as a string (this is also useful if you were to need a dynamic filter):
kwargs = {
'data__8d8dd642-32cb-48fa-8d71-a7d6668053a7': 'bob'
}
MyModel.objects.filter(**kwargs)
That's looks difficult and I'm not 100% convinced what I have will work.
You can try using the JsonField contains lookup. The lookup is explained more under the docs for HStoreField since it's shared functionality.
This would look like this:
MyModel.objects.filter(data__contains={'8d8dd642-32cb-48fa-8d71-a7d6668053a7': 'bob'})
I think this will allow you to circumvent the fact that the lookups need to be valid Python variable names.
If you also want to search wild card (using the example from above)
This will basically search LIKE %bob%
kwargs = {
'data__8d8dd642-32cb-48fa-8d71-a7d6668053a7__icontains': 'bob'
}
MyModel.objects.filter(**kwargs)
My problem is people keep linking to example.com/FooBar but the actual link is example.com/foobar.
My current regex is...
SLUG = '(?P<slug>[\w\d-]+)'
I hope that makes sense. I was surprised I couldn't find this question already asked. Maybe my google fu is weak today.
The regex matches both. The difficulty is that you've likely got a query like:
obj = MyModel.objects.get(slug=slug)
Which isn't matching.
To fix this, change the query to:
obj = MyModel.objects.get(slug=slug.lower())
Also your query could be like
obj = MyModel.objects.get(slug__icontains=slug)
The icontains field lookup will do a case insensitive match
I am using haystack within a project using solr as the backend. I want to be able to perform a contains search, similar to the Django .filter(something__contains="...")
The __startswith option does not suit our needs as it, as the name suggests, looks for words that start with the string.
I tried to use something like *keyword* but Solr does not allow the * to be used as the first character
Thanks.
To get "contains" functionallity you can use:
<tokenizer class="solr.WhitespaceTokenizerFactory"/>
<filter class="solr.EdgeNGramFilterFactory" minGramSize="1" maxGramSize="100" side="back"/>
<filter class="solr.LowerCaseFilterFactory" />
as index analyzer.
This will create ngrams for every whitespace separated word in your field. For example:
"Index this!" => x, ex, dex, ndex, index, !, s!, is!, his!, this!
As you see this will expand your index greatly but if you now enter a query like:
"nde*"
it will match "ndex" giving you a hit.
Use this approach carefully to make sure that your index doesn't get too large. If you increase minGramSize, or decrease maxGramSize it will not expand the index as mutch but reduce the "contains" functionallity. For instance setting minGramSize="3" will require that you have at least 3 characters in your contains query.
You can achieve the same behavior without having to touch the solr schema. In your index, make your text field an EdgeNgramField instead of a CharField. Under the hood this will generate a similar schema to what lindstromhenrik suggested.
I am using an expression like:
.filter(something__startswith='...')
.filter_or(name=''+s'...')
as is seems solr does not like expression like '...*', but combined with or will do
None of the answers here do a real substring search *keyword*.
They don't find the keyword that is part of a bigger string, (not a prefix or suffix).
Using EdgeNGramFilterFactory or the EdgeNgramField in the indexes can only do a "startswith" or a "endswith" type of filtering.
The solution is to use a NgramField like this:
class MyIndex(indexes.SearchIndex, indexes.Indexable):
...
field_to_index= indexes.NgramField(model_attr='field_name')
...
This is very elegant, because you don't need to manually add anything to the schema.xml
I might have missed somthing while searching through the documentation - I can't seem to find a way to use data from one query to form another query.
My query is:
sites_list = Site.objects.filter(worker=worker)
I'm trying to do something like this:
for site in sites_list:
[Insert Query Here]
Edit: I saw the awnser and im not sure how i didnt get that, maybe thats the sign im up too late coding :S
You could easily do something like this:
sites_list = Site.objects.filter(worker=worker)
for site in sites_list:
new_sites_list = Site.objects.filter(name=site.name).filter(something else)
You can also use the __in lookup type. For example, if you had an Entry model with a relation to Site, you could write:
Entry.objects.filter(site__in=Site.objects.filter(...some conditions...))
This will end up doing one query in the DB (the filter condition on sites would be turned into a subquery in the WHERE clause).