I have two tables. Both of them have a column named 'title'. When I use the following code snippet to join two tables, I can't access one of the title column.
$select = $this->select(Zend_Db_Table::SELECT_WITH_FROM_PART);
$select->setIntegrityCheck(false);
$select->join("service","service.id = lecture.service_id");
return $select;
is there a way to access both columns?
You need to rename one of the columns so it doesn't conflict with the other. If you pass an array as the optional 3rd argument to join(), you can specify which columns to retrieve from the joined table. If one or more of the entries in the array is hashed, then the hash key will be used as the property name. With the code below, you can refer to the title column of the service table as "service_title" in your query results. If you want other columns from the service table, add them to the array, with or without hashes as desired.
$select = $this->select(Zend_Db_Table::SELECT_WITH_FROM_PART);
$select->setIntegrityCheck(false);
$select->join("service", "service.id = lecture.service_id",
array("service_title" => "service.title");
return $select;
$select = $this->select();
$select->from(array('t'=>'table1'), array('table_title AS title_first','table_sendo_colun','table_third_colun'));
$select->setIntegrityCheck(false);
$select->join("service","service.id = t.service_id");
return $select;
Maybe It can do the job.
Regard´s.
Related
Working on Azure Cognitive Search with backend as MS SQL table, have some scenarios where need help to define a query.
Sample table structure and data :
Scenarios 1 : Need to define a query which will return data based on category.
I have tied query using search.ismatch but its uses prefix search and matches other categories as well with similar kind of values i.e. "Embedded" and "Embedded Vision"
$filter=Region eq 'AA' and search.ismatch('Embedded*','Category')
https://{AZ_RESOURCE_NAME}.search.windows.net/indexes/{INDEX_NAME}/docs?api-version=2020-06-30-Preview&$count=true&$filter=Region eq 'AA' and search.ismatch('Embedded*','Category')
And it will response with below result, where it include "Embedded" and "Embedded Vision" both categories.
But my expectation is to fetch data only if it match "Embedded" category, as highlighted below
Scenario 2: For the above Scenario 1, Need little enhancement to find records with multiple category
For example if I pass multiple categories (i.e. "Embedded" , "Automation") need below highlighted output
you'll need to use a different analyzer which will break the tokens on every ';' just for the category field rather than 'whitespaces'.
You should first ensure your Category data is populated as a Collection(Edm.String) in the index. See Supported Data Types in the official documentation. Each of your semicolon-separated values should be separate values in the collection, in a property called Category (or similar).
You can then filter by string values in the collection. See rules for filtering string collections. Assuming that your index contains a string collection field called Category, you can filter by categories containing Embedded like this:
Category/any(c: c eq 'Embedded')
You can filter by multiple values like this:
Category/any(c: search.in(c, 'Embedded, Automation'))
Start with clean data in your index using proper types for the data you have. This allows you to implement proper facets and you can utilize the syntax made specifically for this. Trying to work around this with wildcards is a hack that should be avoided.
To solve above mention problem used a below SQL function which will convert category to a json string array supported by Collection(Edm.String) data type in Azure Search.
Sql Function
CREATE FUNCTION dbo.GetCategoryAsArray
(
#ID VARCHAR(20)
)
RETURNS NVARCHAR(MAX)
AS
BEGIN
DECLARE #result NVARCHAR(MAX) = ''
SET #result = REPLACE(
STUFF(
(SELECT
','''+ TRIM(Value) + ''''
FROM dbo.TABLEA p
CROSS APPLY STRING_SPLIT (Category, ';')
WHERE p.ID = #ID
FOR XML PATH('')
),1,1,''),'&','&')
RETURN '[' + #result + ']'
END
GO
View to use function and return desired data
CREATE View dbo.TABLEA_VIEW AS
select
id
,dbo. GetCategoryAsArray(id) as CategoryArr
,type
,region
,Category
from dbo.TABLEA
Defined a new Azure Search Index using above SQL View as data source and during Index column mapping defined CategoryArr column as Collection(Edm.String) data type
Query to use to achieve expected output from Azure Search
$filter=Region eq 'AA' and CategoryArr/any(c: search.in(c, 'Embedded, Automation'))
I have a database from which data is coming into a QTableWidget. The table in the database has the following Columns,
ID (Primary key, auto-increment value)
Name
Location
The QTableWidget has the following columns (that I have added)
ID (this column, I have hidden. and it contains the value of "ID" column from the Database Table)
Sr # (Represents the Row Number of the table)
Name (Contains "name" from the database table)
Location (Contains "Location from the database table)
Actions (Contains a Delete Button for that Row)
By hidden, I mean to say that I have made this column hidden using the folliwng command,
self.ui.table.setColumnHidden(0, True);
This is how I am populating my QTableWidget and creating a Delete Function,
def get_data(self):
mycursor = self.DB.cursor()
Subquery = "select id, name, location "
Subquery += " from tbl_person"
mycursor.execute(Subquery)
numcols = len(mycursor.fetchall()[0])
mycursor.execute(Subquery)
numrows = len(mycursor.fetchall())
self.ui.table.setRowCount(numrows)
self.ui.table.setColumnCount(numcols+2)
mycursor.execute(Subquery)
tablerow = 0
for row in mycursor.fetchall():
layout = QHBoxLayout()
layout.setContentsMargins(0, 0, 0, 0)
layout.setSpacing(0)
delete_button = QPushButton("Delete Data")
delete_button.clicked.connect(self.executeDeleteFunction)
# delete_button.setStyleSheet(delete_push_button) -> Only for styling
self.ui.table.setItem(tablerow, 0, PySide2.QtWidgets.QTableWidgetItem(str(row[0])))
self.ui.table.setItem(tablerow, 1, PySide2.QtWidgets.QTableWidgetItem(str(tablerow+1)))
self.ui.table.setItem(tablerow, 2, PySide2.QtWidgets.QTableWidgetItem(str(row[1])))
self.ui.table.setItem(tablerow, 3, PySide2.QtWidgets.QTableWidgetItem(str(row[2])))
self.ui.table.setCellWidget(tablerow, 4, delete_button)
tablerow += 1
self.ui.table.setColumnHidden(0, True)
#self.ui.registered_table.horizontalHeader().setSectionResizeMode(PySide2.QtWidgets.QHeaderView.Stretch)
self.ui.table.resizeColumnsToContents()
def executeDeleteFunction(self):
self.person_id = self.ui.table.selectionModel().selectedIndexes()[0]
self.person_id = self.person_id.row()
mycursor = self.DB.cursor()
sql = "delete from tbl_person where id = %s"
val = (id, )
mycursor.execute(sql, val)
print("Deletion Successful")
On the Deletion Function, what this code does is basically gets the value of the **Sr # ** Column from the QTableWidget and deletes the data according to that, i.e. it is getting me the value from the visible first column and not the actual first column. But, I want the data from the "ID" column of the QTableWidget which is hidden
I tried to look up on how to get the value from the first hidden column on the QTableWidget and ended up with this link: How to get data from hidden 'id' column in QtableWidget
This apparently solves my issue but I can not seem to make it work for my code. I don't want to retrieve values of multiple Rows but only of one row so how do I do this (as I am only deleting one row. But in the question mentioned, I believe that it is getting data from multiple rows due to that for each loop)?
Moreover, I tried to find help regarding the functionality of sibling function (which is provided in the answer of above question) however I could not find any good resource on this function (i.e. how to use this, or some practical example and etc.)
I tried the following with Sibling function to obtain the value of first hidden column of the Selected Row but it did not work,
self.value = self.table.selectedItems()[0]
self.value = sibling(self.value.row(), 0)
There are some conceptual problems with the given code.
First of all, the QtSql module should be preferred instead of artificially creating a model. For basic tables, QSqlTableModel is fine enough, while for custom queries, QSqlQueryModel is a good choice.
Now the problem is that UI-based selection is always based on visible items: if you select a row in a view that has hidden columns, you will not get the hidden indexes that belong to those columns.
In order to get the indexes (as in QModelIndex) of hidden columns on a table widget, the only way is the same for a table view: you need to access the model and get the index for the row, or you get the actual model index and then get the sibling (which is conceptually the same, as the underlying function does):
item = self.table.selectedItems()[0]
index = self.table.indexForItem(index)
firstRowIndex = index.sibling(index.row(), 0)
sqlIndex = firstRowIndex.data() # might be a string
Note that you can also use siblingAtColumn():
firstRowIndex = index.siblingAtColumn(0)
That's because when you create QTableWidget items, you're actually creating a new model, and the row for that model doesn't reflect the actual "row" of that index in the source model; items in the second row will return 1 for row(), even if their actual row is different, and that's because that item has been added as second to the table widget, since it's the second item in the query.
So, the solution is that you either get the incremental row value for the first column index sibling, or you use one of the predefined Sql models.
For simple models, the latter solution is fine enough, but if you need more complex models, the first is certainly more accurate and reliable.
I've got a problem that I don't know how to solve, I've tried many solutions but always getting that Operational error: near...
def insert_medicine_to_table():
con = sqlite3.connect('med_db3.db')
cur = con.cursor()
table_name = 'medicines'
column_name = "présentation"
value = 'Boîte de 2 seringues pré-remplies'
cur.execute("INSERT INTO medicines {} VALUES (?)".format(column_name), value)
con.commit()
con.close()
sqlite3.OperationalError: near "présentation": syntax error
The goal here is that either the script or python has to recognize the field (column name) and insert the value into "that" field, like the following:
fields = ['présentation', 'princeps', 'distributeur_ou_fabriquant', 'composition', 'famille', 'code_atc', 'ppv', 'prix_hospitalier', 'remboursement', 'base_de_remboursement__ppv', 'nature_du_produit']
values = ['Boîte de 2 seringues pré-remplies', 'Oui', 'SANOFI', 'Héparine', 'Anticoagulant héparinique', 'B01AB01', '43.80', '27.40', 'Oui', '43.80', 'Médicament']
That is one entry in the database. The problem here is that other entries can or not have one or more values for some field, and also the fields are not presented in the same order in other entries.
It has to recognize each field in the database table and insert each value into the right column.
The problem causing your error is that your SQL isn't valid. The statement you are trying to execute is:
INSERT INTO medicines présentation VALUES (?)
The statement you want to execute is:
INSERT INTO medicines ("présentation") VALUES (?)
As far as your larger question is concerned, if you create both the list of columns ("présentation") and list of parameter markers (?) and build the query using them, you're most of the way there.
If a field can have multiple values supplied for each "entry" in your database, you may need to change your database design to handle that. You'll at least need to figure out how you want to handle the situation, but that would be a matter for a different question.
Say I have a stored procedure that returns dataSet from 2 different tables. Example:
SELECT Customers.FirstName, Customers.LastName, SUM(Sales.SaleAmount) AS SalesPerCustomer
FROM Customers LEFT JOIN Sales
ON Customers.CustomerID = Sales.CustomerID
GROUP BY Customers.FirstName, Customers.LastName
Is there any way to get a strongly typed list as a result from this stored procedure ? Something like this:
StoredProcedure sp = myDevDB.GetCustomerSales();
List<MyCustomType> resultSet = sp.ExecuteTypedList<MyCustomType>();
How and where do I define the MyCustomType class ? How do I map its properties to the actual table columns ?
thanks,mehul
I solved it by creating a class (in the same place as all my other classes, but I didn't extend IActiveRecord, it's just a vanilla class).
Make sure the property names have exactly the same name and data type as the ones in the procedure, then call db.sproc(params).ExecuteTypedList().AsQueryable(); and it populated fine.
I am creating BOOK_Issue table which will contain id of person to whom the book is issued.
i have a column name user_id witch will contain ids from tbl_student as well as tbl_faculty. so how to set user_id field of book_issue table with reference to two primary key columns.
Your database schema is not correct.
If you expect unique IDs then they should be in one table.
You can create a table with all the users, and have a column to set their type (student, faculty). Then create 2 different tables for each type that has the proper information for each user based on their type.
Create a "person" superclass that can be either of type "student" or type "faculty". Reference this from the BOOK_Issue table instead.
Basically to create this relationship, you'll need one unique ID that spans both "student" and "faculty". Put this in a table (tbl_person?) and have each row in tbl_student and tbl_faculty reference this new table. It's probably also best to then pull out the fields present in both tbl_student and tbl_faculty and put them in this new supertable instead.
You can solve the problem by either having an extra column in BOOK_Issue table, next to user_id, which indicates if this is a Student ID or a Faculty ID.
Alternatively, the IDs themselves may readily include some pattern which indicate their nature (for example no all faculty Ids may start with say "UC", and none of the student Id are so).
The two solutions above then allow using queries similar to the following
SELECT B.*,
CASE B.BorrowerType -- could be LEFT(user_id, 2) etc...
WHEN 'S' THEN S.Name
WHEN 'F' Then F.Name
END As Name,
CASE B.BorrowerType
WHEN 'S' THEN S.PhoneNumber
WHEN 'F' Then F.Phone -- Note that these constructs allow
-- mapping distinct columns names etc.
END As PhoneNr
FROM BOOK_Issue B
LEFT JOIN tbl_student S ON B.BorrowerType = 'S' AND B.user_id = S.id
LEFT JOIN tbl_faculty F ON B.BorrowerType = 'F' AND B.user_id = F.id
WHERE B.DueDate < '11/23/2009' -- or some other condition
This can get a bit heavy when we need to get multiple columns from the student/faculty tables. A possible alternative is a UNION, but this would then cause the repeating of the search clause.
Finally, the best solution but not avaible on all DBMS is a sub-query driven by an "IF B.BorrowerType = 'S' " condition.
This should be your table design:
FacultyTable (FacultyID, FacultyName)
StudentsTable (StudentID, StudentName, FacultlyID, ...)
BookTable (BookID, BookName, ...)
UsersTable(UserID, UserName, UserPassword, StudentID, LastLogin, ...)
Now this is the main thing:
BookIssedTable(BookIssedID, BookID, UserID)
//This table tells me that a book of "BookID was issued to a user of "UserID"
//this can be better for this is certainly a great improvement from the initial design.