Annotation IsDataSet in VS .NET

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Annotation IsDataSet
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Applies to <xsd:element> representing DataSet
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Meaning This element represents the DataSet
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TableName
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<xsd:element>representing a table
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ColumnName
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<xsd:element>or <xsd:attribute> representing a column
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Ordinal ReadOnly
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ConstraintName
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PrimaryKey ConstraintOnly
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IsNested
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<xsd:element>or <xsd:attribute> representing a column <xsd:element>or Whether or not the column value <xsd:attribute> representing can be edited For example, an a column auto-increment column would be read only <xsd:element>or Whether or not to allow nulls You <xsd:attribute> representing need to set this to false if the a column column is a primary key <xsd:element>or If set to true indicates that the <xsd:attribute> representing column value should be a column incremented automatically Column type must be xsd:int <xsd:unique>, <xsd:key> or The name of the corresponding <xsd:keyref> elements constraint that s created within the DataSet Default is the value of the name attribute <xsd:unique> or <xsd:key> If set to true then a primary key is elements created in the DataSet Otherwise, a unique constraint is created <xsd:keyref> elements If set to true, the DataSet will have a constraint corresponding to this keyref but will not have a parentchild relation between the two tables <xsd:keyref> elements If set to true it indicates that the parent and child tables are nested in the XML document similar to the example invoice document where items are nested within invoice <xsd:keyref> elements How updates to parent records are handled See the section titled Typed DataSets above <xsd:keyref> elements How deleted parent records are handled See the section titled Typed DataSets above
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The name of the table if different from the name of the element Use this to override element name if it is an invalid database name For example, you could create a table called CustomerOrder from an element called Order The name of the column if different from the name of the element/attribute Use this to override element/attribute name if it is an invalid database name For example, you could create a column called OrderTime from an element called Time The ordinal position of the column within the table
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AcceptRejectRule <xsd:keyref> elements
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Relationship
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How changes are handled when you call AcceptChanges or RejectChanges See the section titled Typed DataSets above Unlike all other annotations, Use <msdata:Relationship> to this one is an element Use it explicitly define a relationship between two tables independent of inside an <xsd:appinfo> any unique, key or keyref element definitions
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Typed DataSets from Schemas To create the DataSet structure at design time, you use a tool such as xsdexe, to read the XML schema and generate a set of classes that represent a typed DataSet As you saw in 2, xsdexe is a command line tool that can create classes from XML Schemas and vice versa In total, xsdexe can do four different but related things:
Create typed DataSets in VB, C#, or JScript from an XML schema Create VB, C#, or JScript classes from an XML schema Create a schema from types in a compiled assembly Infer a schema from an instance XML document
Before you create a typed DataSet, you might want to make a copy of the schema and annotate it with msdata attributes to control the typed DataSet For example, I don t want the typed DataSet to be called NewDataSet, which is the default as you saw when you loaded the invoice schema into the DataSet Instead I want the DataSet to be called Invoices and I want the invoiceNumber element to map to a column called invoiceNum To do this I edit the schema and add an <Invoices> element with msdata:IsDataSet="true" I also add msdata:ColumnName="invoiceNum" on the invoiceNumber element declaration and msdata:TableName on both invoice and item element declarations Listing 9-12 shows the annotated schema
Listing 9-12 Annotating the invoice schema to specify table and column names (VBWSBook\9 \AnnotatedInvoicexsd)
<xsd:schema > <xsd:element name="Invoices" msdata:IsDataSet="true"> <xsd:complexType> <xsd:sequence> <xsd:element name="invoice" msdata:TableName="Invoice">
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<xsd:complexType> <xsd:sequence> <xsd:element name="invoiceNumber" msdata:ColumnName="invoiceNum" type="xsd:string" /> <!-- other elements removed --> <xsd:element name="item" msdata:TableName="InvoiceItem" type="ws:ItemType" maxOccurs="unbounded" /> </xsd:sequence> </xsd:complexType> </xsd:element> </xsd:sequence> </xsd:complexType> </xsd:element> </xsd:schema>
To generate a type DataSet from the annotated schema, you issue the command (assuming xsdexe is in your path):