I want to execute query in my yii2 application. I'm using PostgreSQl. There is a table called list inside the user schema. If I try to build any query it returns 1. My code is here:
$numUsers = Yii::$app->db->createCommand('
SELECT COUNT(*) FROM "user"."list"
')->execute();
Please show me my mistake in the query above.
This is not related to the DB type in Yii2 if you want the result of a single value you should use queryScalar() instead of execute()
$numUsers = Yii::$app->db->createCommand('
SELECT COUNT(*) FROM "user"."list" ')->queryScalar();
Related
If it's relevant I'm using Django with Django Rest Framework, django-mssql-backend and pyodbc
I am building some read only models of a legacy database using fairly complex queries and Django's MyModel.objects.raw() functionality. Initially I was executing the query as a Select query which was working well, however I received a request to try and do the same thing but with a table-valued function from within the database.
Executing this:
MyModel.objects.raw(select * from dbo.f_mytablefunction)
Gives the error: Invalid object name 'myapp_mymodel'.
Looking deeper into the local variables at time of error it looks like this SQL is generated:
'SELECT [myapp_mymodel].[Field1], '
'[myapp_mymodel].[Field2] FROM '
'[myapp_mymodel] WHERE '
'[myapp_mymodel].[Field1] = %s'
The model itself is mapped properly to the query as executing the equivalent:
MyModel.objects.raw(select * from dbo.mytable)
Returns data as expected, and dbo.f_mytablefunction is defined as:
CREATE FUNCTION dbo.f_mytablefunction
(
#param1 = NULL etc etc
)
RETURNS TABLE
AS
RETURN
(
SELECT
field1, field2 etc etc
FROM
dbo.mytable
)
If anyone has any explanation as to why these two modes of operation are treated substantially differently then I would be very pleased to find out.
Guess you've figured this out by now (see docs):
MyModel.objects.raw('select * from dbo.f_mytablefunction(%s)', [1])
If you'd like to map your table valued function to a model, this gist has a quite thorough approach, though no license is mentioned.
Once you've pointed your model 'objects' to the new TableFunctionManager and added the 'function_args' OrderedDict (see tests in gist), you can query it as follows:
MyModel.objects.all().table_function(param1=1)
For anyone wondering about use cases for table valued functions, try searching for 'your_db_vendor tvf'.
I have a table of projects with two of it's columns as 'language' and 'tag'.
After the user gives an input, I want to output all the projects whose language is input or tag is input.
Sql query for above would be this,
Sql query: Select * from TableName where language='input' OR tag='input'
I tried to execute the same in Gql but in vain. What should be the query in Gql to output the data in the above mentioned way.
GQL doesn't have OR, so basically you have to make two separate queries and union results:
Select * from TableName where language='input'
Select * from TableName where tag='input'
You should join results on your app side, Cloud Console doesn't support such things too.
See GQL reference: https://cloud.google.com/datastore/docs/apis/gql/gql_reference
I don't know if is mandatory for you to use GQL, but in case you are able to avoid it, you can use the ndb filter instead.
results = TableName.query(ndb.OR(TableName.language == 'input',
TableName.tag == 'input'))
for result in results:
....your code here...
More information in: https://cloud.google.com/appengine/docs/python/ndb/queries
Using SQL Server Management
Using MVC VS 2013 for Web
Being in a Controller
Here materialnumb it's a LINQ query that always return only one value.
Being the following...
var materialnumb = (from r in db.MaterialNumber
where r.MaterialNumber == 80254842
select r.MaterialNumber);
I have another LINQ query from a SQL view that involves several other tables with inner join statements and so on (which includes the previous table db.MaterialNumber) that goes like this:
var query = (from r in db.SQLViewFinalTable
where r.MaterialNumber == Convert.ToInt32(materialnumb.MaterialNumber)
select r
I want to sort all the materials by the retrieved material number from the first query but it drops the following error when I try to pass the query as a model for my View:
LINQ to Entities does not recognize the method 'Int32
ToInt32(System.String)' method, and this method cannot be translated
into a store expression.
I assume this is because the query is an object even if its has just one value so it can't be converted into a single Int32.
Even more, the query it's not being executed, it's just a query...
So, how can achieve my goal?
Additional information: I tried to convert the query outside the "final" query. It still doesn't work.
Additional information: This is just an example, the true query actually has several more other querys embedded and this other querys have also other querys in them, so I need a practical way.
Additional information: I have also tried to convert the query into a string and then again into an int.
Try this:
var materialnumb = (from r in db.MaterialNumber
where r.MaterialNumber == 80254842
select r.MaterialNumber).FirstOrDefault();
var query = from r in db.SQLViewFinalTable
where r.MaterialNumber == materialnumb
select r
But I can not get whay are you filtering by 80254842 and selecting the same value? You can do directly:
var query = from r in db.SQLViewFinalTable
where r.MaterialNumber == 80254842
select r
From my ASP.Net application I am generating XML and pass it as input data to stored procedure as below,
<Aprroval>
<Approve>
<is_nb_approved>false</is_nb_approved>
<is_approved>true</is_approved>
<is_submitted>true</is_submitted>
<UserId>35</UserId>
<ClientId>405</ClientId>
<taskDate>2015-05-23T00:00:00</taskDate>
</Approve>
<Approve>
<is_nb_approved>false</is_nb_approved>
<is_approved>true</is_approved>
<is_submitted>true</is_submitted>
<UserId>35</UserId>
<ClientId>405</ClientId>
<taskDate>2015-05-24T00:00:00</taskDate>
</Approve>
</Approval>
And below is my stored procedure,
create procedure UpdateTaskStatus(#XMLdata XML)
AS
UPDATE [TT_TaskDetail]
SET
is_approved=Row.t.value('(is_approved/text())[1]','bit'),
is_nb_approved=Row.t.value('(is_nb_approved/text())[1]','bit'),
is_submitted=Row.t.value('(is_submitted/text())[1]','bit')
FROM #XMLdata.nodes('/Aprroval/Aprrove') as Row(t)
WHERE user_id = Row.t.value('(UserId/text())[1]','int')
AND client_id = Row.t.value('(ClientId/text())[1]','int')
AND taskdate = Row.t.value('(taskDate/text())[1]','date')
But when I execute this stored procedure, I am getting return value as 0 and no record is getting updated. Any suggestions welcome.
You have 2 errors in your xml:
First is nonmatching root tags.
Second, more important, you are quering nodes('/Aprroval/Aprrove'), but inner tag is Approve not Aprrove.
Fiddle http://sqlfiddle.com/#!3/66b08/3
Your outer tags do not match. Your opening tag says, "Aprroval" instead of "Approval". Once I corrected that, I was able to select from the XML without issue.
I want to create VIEW definitions on MS Access. I have used following CREATE VIEW Statement:
SELECT
MFP.FollowUpPlan_Id,
MFP.FollowUpPlan_Name AS PlanName,
DFP.Sequence_No AS SequenceNo,
MFS.FollowUpSchedule_Name AS ScheduleName
FROM
MAS_FollowUp_Plan AS MFP,
DET_FollowUp_Plan AS DFP,
MAS_FollowUp_Schedule AS MFS
WHERE
(((MFP.FollowUpPlan_Id)=DFP.FollowUpPlan_Id) AND
((DFP.FollowUpSchedule_Id)=MFS.FollowUpSchedule_Id)) AND
MFP.is_Deleted = FALSE AND
DFP.is_Deleted = false
ORDER BY
MFP.FollowUpPlan_Id, DFP.Sequence_No;
but it throw an error:
Only Simple Select Queries are allowed in view.
Please Help, Thanks in Advance.
The issue here, as Jeroen explained, is a limitation of Access' CREATE VIEW statement. For this case, you can use CREATE PROCEDURE instead. It will create a new member of the db's QueryDefs collection --- so from the Access user interface will appear as a new named query.
The following statement worked for me using ADO from VBScript. From previous Delphi questions on here, my understanding is that Delphi can also use ADO, so I believe this should work for you, too.
CREATE PROCEDURE ViewSubstitute AS
SELECT
MFP.FollowUpPlan_Id,
MFP.FollowUpPlan_Name AS PlanName,
DFP.Sequence_No AS SequenceNo,
MFS.FollowUpSchedule_Name AS ScheduleName
FROM
(MAS_FollowUp_Plan AS MFP
INNER JOIN DET_FollowUp_Plan AS DFP
ON MFP.FollowUpPlan_Id = DFP.FollowUpPlan_Id)
INNER JOIN MAS_FollowUp_Schedule AS MFS
ON DFP.FollowUpSchedule_Id = MFS.FollowUpSchedule_Id
WHERE
MFP.is_Deleted=False AND DFP.is_Deleted=False
ORDER BY
MFP.FollowUpPlan_Id,
DFP.Sequence_No;
You cannot mix ORDER BY with JOIN when creating views in Access. It will get you the error "Only simple SELECT queries are allowed in VIEWS." (note the plural VIEWS)
Having multiple tables in the FROM is a kind of to JOIN.
either remove the ORDER BY,
or have only one table in the FROM and no JOINs.
I remember from the past (when I did more Access stuff than now) seeing this for a large query with a single table select with an ORDER BY as well.
The consensus is that you should not have ORDER BY in views anyway, so that is your best thing to do.
Another reason that you can get the same error message is if you add parameters or sub selects. Access does not like those in views either, but that is not the case in your view.
Declare variable olevarCatalog ,cmd as OleVariant in Delphi, Uses ComObj
olevarCatalog := CreateOleObject('ADOX.Catalog');
olevarCatalog.create(YourConnectionString); //This Will create MDB file.
// Using ADO Query(CREATE TABLE TABLEName....) add the required Tables.
// To Insert View Definition on MDB file.
cmd := CreateOleObject('ADODB.Command');
cmd.CommandType := cmdText;
cmd.CommandText := 'ANY Kind of SELECT Query(JOIN, OrderBy is also allowed)';
olevarCatalog.Views.Append('Name of View',cmd);
cmd := null;
This is a best way to Create MS ACCESS File(.MDB) and VIEWs using Delphi.