D5 Creating a Master-Details DataSet in Visual Studio .NET

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Listing D5 Creating a Master-Details DataSet
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private DataSet GetCustomersAndOrders() { DataSet ds = new DataSet(); SqlConnection conn = new SqlConnection( "server=localhost;database=Northwind;trusted_connection=true"); SqlCommand customersCmd = new SqlCommand("SELECT CustomerID, CompanyName, ContactName FROM Customers", conn); SqlDataAdapter customersAdapter = new SqlDataAdapter(customersCmd); // Set the adapter to add primary key information customersAdapterMissingSchemaAction = MissingSchemaActionAddWithKey; SqlCommand ordersCmd = new SqlCommand("SELECT OrderID, CustomerID, OrderDate FROM Orders", conn); SqlDataAdapter ordersAdapter = new SqlDataAdapter(ordersCmd); // Set the adapter to add primary key information ordersAdapterMissingSchemaAction = MissingSchemaActionAddWithKey; // Add the customers to the DataSet customersAdapterFill(ds,"Customers"); // Add the orders to the DataSet ordersAdapterFill(ds, "Orders"); // Create the parent-child relation DataColumn parentCol = dsTables["Customers"]Columns["CustomerID"]; DataColumn childCol = dsTables["Orders"]Columns["CustomerID"]; DataRelation dr = new DataRelation( "Customers_Orders",parentCol,childCol); // Set the relation as nested for output XML
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// (Orders are child elements of Customers) drNested = true; // Add the relation to the DataSet's collection // Adds a corresponding foreign key constraint as well dsRelationsAdd(dr); // Return the result return ds; }
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Setting the data adapter's MissingSchemaAction property to AddWithKey before calling Fill will direct the data adapter to also determine the column(s) that comprise the primary key, if any, when the data adapter executes the query, and it will create corresponding unique constraints in the resulting table To create the data relation, you need to specify what the primary key column in the parent table is, as well as the foreign key column in the child table The easiest way to do this is using the DataColumn objects representing those columns This will also implicitly specify which table is the parent table and which table is the child table, because columns can only belong to one table Alternatively, you could specify the parent and child tables and columns by name Adding the data relation also creates a corresponding foreign key constraint to enforce the rule that a corresponding row in the parent table must exist when a row in the child table refers to it Notice that the code also sets the Nested property on the data relation to true This only affects the XML that is output if you save the data set with WriteXml or get it as a string withGetXml It would then show child rows as nested elements under the parent row elements
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Retrieving Data with Stored Procedures
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When you work with stored procedures, you often need to provide parameters to them that affect their execution The stored procedure might simply wrap a query that will return rows of data, or it might update, insert, or delete data in the database In any of these cases, you usually have to tell the stored procedure which sets of data to operate on, and you do this through parameters Let's start with a simple example In the Northwind database, there is a stored procedure defined named CustOrderHist You provide it with a customer ID, and it will return a result set containing a summary of products and their quantity ordered by that customer To call a stored procedure using ADONET, you use the SqlCommand class, as demonstrated earlier in this appendix However, you need to tell the command object that you are calling a stored procedure instead of providing a textual query You also need to provide the command object with any parameters that need to be passed to the stored procedure that it will execute You do this as shown in Listing D6
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Listing D6 Retrieving Data Through a Stored Procedure
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private DataSet GetCustomerOrderHistory(string custId) { // Validate the input if (custIdLength != 5) throw new ArgumentException( "The customer ID must be a 5 character string","custId"); DataSet ds = new DataSet("CustomerOrderHistoryDataSet"); SqlConnection conn = new SqlConnection( "server=localhost;database=Northwind;trusted_connection=true"); // Create the stored proc command to get customer history SqlCommand custHistCmd = new SqlCommand("CustOrderHist", conn); custHistCmdCommandType = CommandTypeStoredProcedure; // Create the parameter for the customer ID SqlParameter custIdParam = new SqlParameter( "@CustomerID",SqlDbTypeNChar,5); custIdParamValue = custId; // Add the parameter to the command custHistCmdParametersAdd(custIdParam); SqlDataAdapter custHistAdapter = new SqlDataAdapter(custHistCmd); custHistAdapterFill(ds,"CustomerHistory"); return ds; }
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In this case, you create the command object by specifying the name of the stored procedure you want to call instead of supplying a SQL query string, and you set the CommandType property on the command to StoredProcedure (the default is CommandTypeText) You then need to create a SqlParameter object (discussed later in this appendix) to encapsulate each of the parameters needed by the stored procedure and add them to the command's Parameters collection Once everything is set up, you call theFill method on the data adapter as before, and it will call the specified stored procedure, placing the result set returned into a table in the data set
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