I have two tables employee, department with a one to many relationship such that a column name 'depRefID' in employee references the primary key of the 'department' table.
I have a dojogrid that fetched data from employee table via a Service variable and a select menu that lists the department names.
I've setup an onchange function on the select menu that, would ideally loop each selected row in the employee table and change its foreign key to the one selected via the select widget.
I'm trying to use a separate service variable to update "employee" table using and update query.
How can I reference or access the foreign key 'depRefID' in HQl as directly referencing it throws an exception.
Related
the problem is that i have made three tables and first two table's primary keys are declared as foreign keys in the third table. now i want to store data in the third table but the problem is that no ids are being passsed to the foreign Key values thats why i am getting errors
as you can see i have shown to drop down lists, one for student and second for courses but when i try to register the record it is not getting ids of primary keys which are declared as foreign keys in the new table
I have a large detail table for which one column is a foreign key to a list of values/lookup table.
The BIRT report is on the detail table.
I want to select rows from the detail table given a user-selected value from the foreign key table.
Detail:
select id, o.owner_name, ....
from detail as d
inner join
owner as o
on (d.owner_id = o.owner_id)
where d.owner_id = ?
Foreign Key/LOV/Lookup table
select owner_id, owner_name
from owner;
So, on report execution, the user is presented with a pulldown menu populated with the owner_id/owner_name values from the owner table. The user selects the required owner_name whose owner_id value is then provided to the detail where clause parameter.
Is this possible?
I didn't see it after quite a bit of time looking, but in the end RTFM got me there.
Create two data sets, one for the detail the other for the lookup;
In report's parameters, see "Selection list values"/Dynamic
I have a table cars with attributes: id, name. I also have another table specs with id, car_id, name. This tables are related with one to many relations from the Models. I also have set up the foreign keys in.
I have a controller manageData where i have a function insertCar which i use to insert data and update both tables. I wan to create another function deleteCar from where i can delete the car along with its specs from the other table
Use onDelete() method in migration when defining foreign key:
$table->foreign('car_id')->references('id')->on('cars')->onDelete('cascade');
In this case when you'll delete a car record, related data will be automatically deleted from another table.
https://laravel.com/docs/5.4/migrations#foreign-key-constraints
I want to add to the UserProfile table of the StarterSite database created by the WebMatrix Starter Site template another column named email_pk (varchar 50) as primary key and add to id a foreign key constraint that references the Email column (varchar 50) of a new tb_contacts table. The latter column isn't a primary key.
When I try to do that manually in the WebMatrix Database workspace I get the following error:
There are no primary or candidate keys in the referenced table 'dbo.UserProfile' that match the referencing column list in the foreign key 'FK_tb_admin_user_UserProfile'.
Could not create constraint. See previous errors.
System.Data.SqlClient.SqlException (0x80131904): There are no primary or candidate keys in the referenced table 'dbo.UserProfile' that match the referencing column list in the foreign key 'FK_tb_admin_user_UserProfile'.
Could not create constraint. See previous errors.
at Microsoft.WebMatrix.DatabaseManager.SqlDatabase.SqlDatabaseProvider.EditTable(String connectionString, String schema, TableInfo tableInfo)
at Microsoft.WebMatrix.DatabaseManager.IisDbManagerModuleService.EditTable(DatabaseConnection databaseConnection, String schema, Object tableInfoData, String configPathState)
at Microsoft.WebMatrix.DatabaseManager.Client.ClientConnection.EditTable(String schema, Object tableInfoData)
at Microsoft.WebMatrix.DatabaseManager.Client.ClientTable.CommitChanges()
at Microsoft.WebMatrix.DatabaseManager.Client.TableDesignerViewModel.PerformSave()
ClientConnectionId:1da00f40-8f46-4c5b-b423-905c6990fd0d
If you want to add a foreign key to your UserProfile table, the referenced column must be a primary key or have a unique constraint.
You could manually add a unique constraint with a query like this:
ALTER TABLE tb_contacts
ADD UNIQUE (Email)
By the way, the New Relationship dialog of the WebMatrix Databases workspace displays as possible references only the tables with suitable primary keys.
Note that your StarterSite db alterations inhibit the use of the WebSecurity class.
There is a requirement in our application to create the unique primary key which depend on the value of another unique column (ERROR_CODE). But our application is in a geo active active environment (have several active databases which are synchronized using another program).
Therefore even-though we have a unique constraint on this ERROR_CODE field, there is a possibility that each database has a row with a different PK for the same ERROR_CODE. During the database synchronization, this is a problem, because there are some child tables which has the PK stored in one DB and other rows contain the PK stored in other DB. Because of the unique constraint of ERROR_CODE, sync process cannot move both rows to each database (which is also not a good thing to do).
So there is a suggestion to use the hash of the ERROR_CODE field as the PK value.
I would like to know whether we can define a function based Primary key in oracle?
If PK field is "ID",
"ID" should be equal to ora_has(ERROR_CODE).
Is it possible to define the primary key like that in oracle?
In Oracle 10 you cannot do this, but in Oracle 11 you can. You have to create a virtual column, such columns can be used also as primary key:
ALTER TABLE MY_TABLE ADD (ID NUMBER GENERATED ALWAYS AS (ora_has(ERROR_CODE)) VIRTUAL);
ALTER TABLE MY_TABLE ADD CONSTRAINT t_test_pk PRIMARY KEY (ID) USING INDEX;