Form of Command Tree
Note
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A command tree is made up of zero or more command-tree nodes. A command-tree node is a DBCOMMANDTREE structure with the following members.
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op
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An operator from Data Manipulation Operators that defines the operation that will take on the associated field.
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wKind
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A value that defines the data type of the associated field, a member of DBVALUEKIND. This type tags the value so that the command processor knows how to interpret it.
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pctFirstChild
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A link to the first child of this node.
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pctNextSibling
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A link to the next sibling of this node.
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value
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A union to hold the value for every data type supported by this OLE DB provider. For any union member that holds 8 bytes or less, the value itself is stored here. Otherwise, value is a pwszValue member, a pointer to the data.
- For a list of the types of nodes that can exist, see Catalog of DML Nodes.