Figure 129 An Empty Typed Data Set in .NET

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Figure 129 An Empty Typed Data Set
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Apparently this picture is worth 18 words, and, as it states, you can drag objects from either Server Explorer or the Toolbox Most often it will be Server Explorer, as shown in Figure 1210
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Figure 1210 Server Explorer
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Server Explorer allows you to navigate to various data providers If you are using SQL Server, you can navigate directly to the servers to find databases Otherwise, you will need to create a data connection or select an existing one If you created new data connections in the earlier examples for adding a connection to a form, you should notice that connection shown here as well To create a typed data set, you drag any number of tables, stored procedures, views, or functions from the database onto the Designer surface Dragging and dropping the Customers and Orders tables form the Northwind database will show you something like Figure 1211
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Figure 1211 Typed Data Set with New Tables
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Here, dropping the tables onto the design surface created two tables: one for Customers and one for Orders In each table, the Designer was able to ask the database for the primary key, as indicated by the key icons In addition, notice that each column is typed, which is what puts the "typed" in "typed data set" Saving the schema generates a new type having the same name as the schema and deriving from the DataSet base class Inside this new type are
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nested types that provide type-safe wrappers around each row: public class CustomerSet : DataSet { public class CustomersRow : DataRow { public string CustomerID {} public string CompanyName {} } } With the new typed data set, the code to pull data out of a column is now shorter and more robust: // Create a typed data set CustomerSet dataset = new CustomerSet(); // Fill the data set as normal // // Untyped access // string postalCode = // (string)datasetTables["Customers"]Rows[0]["PostalCode"]; // Typed access string postalCode = datasetCustomers[0]PostalCode; Because it derives directly from the DataSet class, a CustomerSet object can be filled and manipulated exactly like a regular data set It is a typed data set, so the new typed properties simplify the code As an additional benefit, the tables and columns in the typed data are also available in VSNET's IntelliSense, causing typed data sets to further decrease our typing [sic] Using typed data sets in this way is very helpful, but what about constraints, relations, and expressions Data Set Designer supports them, too
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Constraints in Typed Data Sets
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Adding a unique constraint to a table is a matter of dropping a key onto the table from the XML Schema Toolbox, as shown in Figure 1212
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Figure 1212 XML Schema Toolbox
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Dropping a key produces the Edit Key dialog, as shown in Figure 1213
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Figure 1213 Edit Key Dialog
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To add the unique constraint, you specify the table in the Element drop-down, and the column in the Fields If you want to create a multicolumn unique constraint, such as requiring that the combination of first and last name be unique, you can specify more than one column under Fields Adding a foreign key constraint requires adding a Relation from the Toolbox
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Relations in Typed Data Sets
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To add a relation to a typed data set, drop a Relation onto the table that will serve as the parent of the relation This opens the Edit Relation dialog, where you finish the job, as shown
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inFigure 1214
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Figure 1214 Edit Relation Dialog
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The Parent element will be set based on the table you dropped the Relation onto, so you'll need to set the Child element After you do, the Name will be set to something fairly intuitive, although you can change it if you like By default, the Key Fields (which form the relation) will be the two primary keys from the two tables, which is likely what you want to relate in the first place In most cases this dialog will give you all the options you need (the documentation can explain the subtleties of this dialog if you need more) A relation will show in the Designer something like the one shown in Figure 1215
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