Returning a Dataset in VS .NET

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Listing 6-10 Returning a Dataset
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public DataSet GetCourses() { DataSet ds = new DataSet("Courses"); SqlConnection connection = new SqlConnection(dsn); // Fill the Course table in the DataSet string command = "SELECT CourseID, Number, " + "Title, Active, [Timestamp] FROM CourseInfo"; SqlDataAdapter adapter = new SqlDataAdapter(command, connection); adapterFill(ds, "Course"); // Fill the CourseDate table in the DataSet command = "SELECT CourseDateId, CourseId, StartDate " + "Length, Location, Price, MaxAttendees, " + "[Timestamp] FROM CourseDates"; adapter = new SqlDataAdapter(command, connection); adapterFill(ds, "CourseDate"); // Define a relation from the Course to the // CourseData table dsRelationsAdd("Courses_CourseDates", dsTables["Course"]Columns["CourseId"], dsTables["CourseDate"]Columns["CourseId"], true); return ds; }
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Listing 6-11 shows how you can use an untyped dataset The dataset is returned from theGetCourses method shown in Listing 6-10 The Tables property of the dataset returns aDataTableCollection where an indexer with the name of the table is used to get a DataTable The DataTable object has a propertyRows that returns a DataRowCollection With a foreach statement, you can loop through all DataRow objects In the foreach block, the columns Number and Title are accessed by using indexers
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Listing 6-11 Using an Untyped Dataset
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using SamplesCourseManagementData; using SystemData; public class Test { static void Main() { string dsn = "server=localhost;database=Courses;" + "trusted_connection=true"; CoursesData db = new CoursesData(dsn); DataSet ds = dbGetCourses(); foreach (DataRow row in dsTables["Course"]Rows) { ConsoleWriteLine("{0} {1}", row["Number"], row["Title"]); } } }
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With Visual Studio, you can also create typed datasets A typed dataset is a class that derives from the class DataSet and adds properties for tables and columns in addition to inner classes that represent the tables You can create a typed dataset with the Dataset XML schema editor, as shown in Figure 6-6 Using this editor, you can drag and drop tables or stored procedures from the server explorer to the designer surface Visual Studio 2005 automatically adds relations to the schema With Visual Studio NET 2003, you have to add relations yourself In the class view, you can see the Dataset XML schema editor with the classes Course and CourseDate
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Figure 6-6 Dataset editor
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Listing 6-12 shows the same method GetCourses that was shown inListing 6-10, but here a typed dataset is returned rather than an untyped dataset The variable ds is now a reference to an object of type CoursesDataset rather than DataSet With the Fill method of the adapter, the parameter passed is the table inside the dataset that can be accessed with a propertyin the example, the properties Course and CourseDate map to the tables Courses and CourseDates Because the relation of the dataset tables is already defined with the XML [7] schema, there is no need to define the relation programmatically, so the code to create the relation from Listing 6-10 is removed here
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Listing 6-12 Returning a Typed Dataset
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public CoursesDataset GetCourses() {
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CoursesDataset ds = new CoursesDataset();
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SqlConnection connection = new SqlConnection(dsn); // Fill the Course table in the DataSet string command = "SELECT CourseID, Number, " + "Title, Active, [Timestamp] FROM CourseInfo"; SqlDataAdapter adapter = new SqlDataAdapter(command, connection);
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adapterFill(dsCourse);
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// Fill the CourseDate table in the DataSet command = "SELECT CourseDateId, CourseId, StartDate " + "Length, Location, Price, MaxAttendees, " + "[Timestamp] FROM CourseDates"; adapter = new SqlDataAdapter(command, connection);
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adapterFill(dsCourseDate);
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// With the schema, the programmatic creation of // the relation is no longer needed return ds; }
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Listing 6-13 shows how you can use a typed dataset You can compare this with the code in Listing 6-11 with the untyped dataset With the typed dataset, to access a table you can use a property with the name of the table instead of an indexer, as used earlier The property Course of the typed dataset returns a typed representation of the Course table, the CourseDataTable class Every row is represented with the CourseRow class, which has properties such asNumber and Title to access the columns The CourseRow and CourseDataTable classes are defined as inner classes in the class CoursesDataset
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