Dataset updating multiple tables
For example, when displaying product information we likely want to list each product s corresponding category and supplier s names. All of the SQL gurus I ve talked to have said roughly the same thing, that it doesn t really matter performance-wise as SQL Server will produce roughly identical execution plans. Figure 15: Deleting an Employee That has Corresponding Orders Results in a Foreign Key Constraint Violation (Click to view full-size image) To allow an employee to be deleted you could: s provide two different techniques for accessing data from related tables in a query.
The SELECT Product ID, Product Name, Supplier ID, Category ID, Quantity Per Unit, Unit Price, Units In Stock, Units On Order, Reorder Level, Discontinued, (SELECT Category Name FROM Categories WHERE Categories. Category ID) as Category Name, (SELECT Company Name FROM Suppliers WHERE Suppliers. Supplier ID) as Supplier Name FROM Products SELECT Product ID, Product Name, Products. Category ID, Quantity Per Unit, Unit Price, Units In Stock, Units On Order, Reorder Level, Discontinued, Categories. Company Name as Supplier Name FROM Products LEFT JOIN Categories ON Categories. Their advice, then, is to use the technique that you and your team are most comfortable with. That means all of the customizations we later made would be lost if we right-clicked on the Table Adapter, chose Configure from the context menu, and completed the wizard again. In previous tutorials we most commonly made use of correlated subqueries because the Table Adapter cannot auto-generate s.
Modified Current)) however having no errors during code execution when i call this code but still after i close the form and open again i can't find the changes i made after i save the data w/ the code above.
If you have'updates, inserts, and deletes happening in all of'the datase's tables then yoyu have to submit things'in order.'submit all the inserts first starting from the'top table on down My AD1.
i would be very if someone can enlighten me on how to save a dataset that has a multiple table in it.
Hello jay 'in the example code below it is assumed that each data 'adapter (My AD1, My AD2, My Ad3) have commands for update 'delete and inserts for the respective tables they are 'managing.
If there'are parent/child relationships involed here then you'have to break up the process lets say the tables'are 1 parent to two that is parent to 3.
Modified Current))'finally submit the deletions from the bottom up My AD3.
Therefore, we will start by creating a Table Adapter whose main query does not contain any folder. Last Name as Manager Last Name FROM Employees LEFT JOIN Employees AS Manager ON Employees. Employee ID stored procedure in the Server Explorer and choose Execute. With the Table Adapter s initial configuration complete, we augmented the stored procedure. the following are the 3 tables in my sql database students schyrsem Sch Yr Sem Course here's some variables i have Private ds Student Course As Data Set Private dt Students As Data Table Private dt Sch Yr Sem As Data Table Private dt Sch Yr Sem Course As Data Table Private dv Sch Yr Sem As Data View Private dv Sch Yr Sem Course As Data View Private sda As Sql Data Adapter here's some of the code to fill the dataset Dim scnn NW As New Sql Connection(str Conn) Dim str SQL As String = _ "SELECT IDNo, Last Name, First Name " & _ "FROM Students" Dim scmd As New Sql Command(str SQL, scnn NW) sda = New Sql Data Adapter(scmd) Dim scb As New Sql Command Builder(sda) scb. my 3 tables looks like the 3 tables from northwind database that has an employees, orders, and order details. Modified Current)) 'finally submit the deletions from the bottom up My AD3. i would be very if someone can enlighten me on how to save a dataset that has a multiple table in it. i tried your source code just the update only to simplify my problem here's the source code modified from what you have told me to do.