I have a membership model, and I want to search OR on two columns....not sure how to do it.
I tried this:
u1.all_memberships.where(inviter: u2, invited: u2)
Membership Load (6.8ms) SELECT "memberships".* FROM "memberships" WHERE (memberships.user_id = 1 OR memberships.invited_id = 1) AND "memberships"."user_id" = 3 AND "memberships"."invited_id" = 3
=> []
But note the 2 AND on both queries, when ideally what I would like to do is literally just replace all the ANDs with ORs.
So I would love if the query looked something like this:
Membership Load (6.8ms) SELECT "memberships".* FROM "memberships" WHERE (memberships.user_id = 1 OR memberships.invited_id = 1) OR (memberships.user_id = 3 OR memberships.invited_id = 3)
Assuming that my modification is syntactically correct SQL ofcourse.
How do I do that with a where clause? Is that possible?
I expect It can help
where("inviter_id = ? OR invited_id = ? ", u2.id, u2.id)
DRYer solution
where("inviter_id = :uid OR invited_id = :uid ", uid: u2.id)
Related
How can i filter 12 random objects from a model in django .
I tried to do this but It does not work and It just returned me 1 object.
max = product.objects.aggregate(id = Max('id'))
max_p = int(max['id'])
l = []
for s in range(1 , 13):
l.append(random.randint(1 , max_p))
for i in l:
great_proposal = product.objects.filter(id=i)
products = product.objects.all().order_by('-id')[:50]
great_proposal1 = random.sample(list(products) , 12)
Hi . It worked with this code !
Try this:
product.objects.order_by('?')[:12]
The '?' will "sort" randomly and "[:12]" will get only 12 objects.
I'm pretty sure the code is correct, but maybe you did not realize that you're just using great_proposal as variable to save the output, which is not an array, and therefore only returns one output.
Try:
result_array = []
for i in l:
result_array.append(product.objects.filter(index=i))
I have three lists that look like this:
age = ['51+', '21-30', '41-50', '31-40', '<21']
cluster = ['notarget', 'cluster3', 'allclusters', 'cluster1', 'cluster2']
device = ['htc_one_2gb','iphone_6/6+_at&t','iphone_6/6+_vzn','iphone_6/6+_all_other_devices','htc_one_2gb_limited_time_offer','nokia_lumia_v3','iphone5s','htc_one_1gb','nokia_lumia_v3_more_everything']
I also have column in a df that looks like this:
campaign_name
0 notarget_<21_nokia_lumia_v3
1 htc_one_1gb_21-30_notarget
2 41-50_htc_one_2gb_cluster3
3 <21_htc_one_2gb_limited_time_offer_notarget
4 51+_cluster3_iphone_6/6+_all_other_devices
I want to split the column into three separate columns based on the values in the above lists. Like so:
age cluster device
0 <21 notarget nokia_lumia_v3
1 21-30 notarget htc_one_1gb
2 41-50 cluster3 htc_one_2gb
3 <21 notarget htc_one_2gb_limited_time_offer
4 51+ cluster3 iphone_6/6+_all_other_devices
First thought was to do a simple test like this:
ages_list = []
for i in ages:
if i in df['campaign_name'][0]:
ages_list.append(i)
print ages_list
>>> ['<21']
I was then going to convert ages_list to a series and combine it with the remaining two to get the end result above but i assume there is a more pythonic way of doing it?
the idea behind this is that you'll create a regular expression based on the values you already have , for example if you want to build a regular expressions that capture any value from your age list you may do something like this '|'.join(age) and so on for all the values you already have cluster & device.
a special case for device list becuase it contains + sign that will conflict with the regex ( because + means one or more when it comes to regex ) so we can fix this issue by replacing any value of + with \+ , so this mean I want to capture literally +
df = pd.DataFrame({'campaign_name' : ['notarget_<21_nokia_lumia_v3' , 'htc_one_1gb_21-30_notarget' , '41-50_htc_one_2gb_cluster3' , '<21_htc_one_2gb_limited_time_offer_notarget' , '51+_cluster3_iphone_6/6+_all_other_devices'] })
def split_df(df):
campaign_name = df['campaign_name']
df['age'] = re.findall('|'.join(age) , campaign_name)[0]
df['cluster'] = re.findall('|'.join(cluster) , campaign_name)[0]
df['device'] = re.findall('|'.join([x.replace('+' , '\+') for x in device ]) , campaign_name)[0]
return df
df.apply(split_df, axis = 1 )
if you want to drop the original column you can do this
df.apply(split_df, axis = 1 ).drop( 'campaign_name', axis = 1)
Here I'm assuming that a value must be matched by regex but if this is not the case you can do your checks , you got the idea
In database I have partitioning table by column 'status' for better performance. My database administrator ask me about put in query value for that column directly in sql (not bind by parameter).
I can change binding by set hint QueryHints.BIND_PARAMETERS on false, but then all parameters are inside sql.
Can I set not bind only on 'status' parameter ?
Example result when BIND_PARAMETERS = true
SELECT t0.* FROM S_JOBS_ORG_UNIT_CFG t0
WHERE ((((t0.ORG_ID = ?) AND (t0.SCHEDULER_NEXT_ACTIVATION < SYSDATE)) AND (t0.ACTIVE = ?))
AND NOT EXISTS (SELECT ? FROM S_JOBS t1 WHERE (((t1.ORDER_ID = t0.ORDER_ID) AND (t1.ORG_ID = t0.ORG_ID)) AND NOT ((t1.STATUS = ?)))) )
bind => [472100, Y, 1, E]
and result when BIND_PARAMETERS = false
SELECT t0.* FROM S_JOBS_ORG_UNIT_CFG t0
WHERE ((((t0.ORG_ID = 472100) AND (t0.SCHEDULER_NEXT_ACTIVATION < SYSDATE)) AND (t0.ACTIVE = Y))
AND NOT EXISTS (SELECT 1 FROM S_JOBS t1 WHERE (((t1.ORDER_ID = t0.ORDER_ID) AND (t1.ORG_ID = t0.ORG_ID)) AND NOT ((t1.STATUS = E)))) )
Code:
Query jobOrgUnitCfgQuery = entityManager.createQuery(
"SELECT c FROM JobOrgUnitCfg c WHERE c.orgId = :orgId and c.schedulerNextActivation < current_timestamp and c.active = :active and " +
" not exists (SELECT j FROM Job j WHERE j.orderId = c.orderId and j.orgId = c.orgId and j.status <> 'E')");
jobOrgUnitCfgQuery.setParameter("orgId", orgId);
jobOrgUnitCfgQuery.setParameter("active", Boolean.TRUE);
return jobOrgUnitCfgQuery.getResultList();
I think your best bet is just to programmatically build your query like you're doing with a hard coded status and escape the other paramaters manually to avoid SQL Injection.
I have a query
SELECT d.name, count(e.id) FROM department d LEFT OUTER JOIN employee e on e.department_id = d.id and e.salary > 5000
and how i can convert this to jpa
right now i have:
CriteriaQuery<Object[]> criteria = builder.createQuery(Object[].class);
Root<Department> root = criteria.from(Department.class);
Path<String> name = root.get("name");
Expression<Long> empCount = builder.count(root.get("employees").get("id"));
criteria.multiselect(name,empCount);
TypedQuery<Object[]> query = em.createQuery(criteria);
I simplified both examples by removing ordering and grouping
can anyone tell me how i can modifie my jpa code to get same reslults like from my sql query
thanks in advance
You're not far from the result. The problem is that, AFAIK, you can't add any restriction on the on clause, using JPA. So the query wil have to be rewritten as
SELECT d.name, count(e.id) FROM department d
LEFT OUTER JOIN employee e on e.department_id = d.id
where (e.id is null or e.salary > 5000)
Here is the equivalent of this query not tested):
CriteriaQuery<Object[]> criteria = builder.createQuery(Object[].class);
Root<Department> root = criteria.from(Department.class);
Path<String> name = root.get("name");
Join<Department, Employee> employee = root.join("employees", JoinType.LEFT);
Expression<Long> empCount = builder.count(employee.get("id"));
criteria.multiselect(name,empCount);
criteria.where(builder.or(builder.isNull(employee.get("id")),
builder.gt(employee.get("salary"), 5000)));
TypedQuery<Object[]> query = em.createQuery(criteria);
Is it possible to do something like this in SubSonic3?
_db.Update<Product>()
.Set("UnitPrice")
.EqualTo(UnitPrice + 5)
.Where<Product>(x=>x.ProductID==5)
.Execute();
I would need something lik this:
UPDATE Blocks
SET OrderId = OrderId - 1
WHERE ComponentId = 3
But in SubSonic3
I think you can here is a sample for demonstrating how you can use subsonic 3
// One thing you might not have seen with Linq To Sql is the ability to run Updates
//and Inserts, which I've always missed and have now implemented with SubSonic 3.0:
db.Update<Products>().Set(
x => x.Discontinued == false,
x => x.ReorderLevel == 100)
.Where(x=>x.Category==5)
.Execute();
db.Insert.Into<Region>(x => x.RegionID, x => x.RegionDescription)
.Values(6, "Hawaii")
.Execute();
and here a link to the full demonstration
i do it as a select
var model = ClassName.SingleOrDefault(x => x.id == 1);
model.name = "new name";
model.tel = " new telephone;
model.save();
done