Changes between Initial Version and Version 1 of CodeSnippets/BatchInsert

Timestamp:

10/29/08 07:58:27 (16 years ago)

Author:

jng

Comment:

--

CodeSnippets/BatchInsert

@@ +1 @@
+[[PageOutline]]
+
+This page is an FDO Code Snippet.  Visit the CodeSnippets page to view more!
+
+= Using batch insert =
+
+Using a batched insert is a more efficent method of inserting features in bulk instead of using the regular insert. For providers like KingOracle, batched inserts can be up to 10x faster than regular inserts.
+
+With a regular insert the process is as follows:
+
+ 1. Create the IInsert command, set its feature class
+ 2. Add each value to insert as a PropertyValue into the command's PropertyValues collection, referencing the property name this value will be put into.
+ 3. Execute the command
+
+With a batched insert, the process is instead:
+
+ 1. Create the IInsert command, set its feature class
+ 2. Add a parameter for each value that will be inserted as a batch into the command's PropertyValues collection
+ 3. For each feature to be inserted
+  a. Create a ParameterValueCollection
+  b. For each value in the feature to be inserted
+   i. Add a ParameterValue containing the value to insert and referencing the parameter to be inserted into (from step 2)
+  c. Add this ParameterValueCollection into the command's BatchParameterValues collection
+ 4. Execute the command
+
+The sample below illustrates this procedure with a list of Parcel objects. This assumes the feature source we are inserting into has the following feature class properties:
+
+ * Name : string
+ * Address : string
+ * LandValue : double
+
+== C# Example ==
+
+{{{
+#!cpp
+
+  class Parcel
+  {
+      public string Name;
+      public string Address;
+      public double LandValue;
+  }
+
+  ...
+
+  IInsert insertCmd = ...;  
+  List<Parcel> parcels = ...;
+  
+  //Add parameter PName as a placeholder for property "Name"
+  insertCmd.PropertyValues.Add(new PropertyValue("Name", new Parameter("PName")));
+  //Add parameter PAddress as a placeholder for property "PAddress"
+  insertCmd.PropertyValues.Add(new PropertyValue("Address", new Parameter("PAddress")));
+  //Add parameter PLandValue as a placeholder for property "PLandValue"
+  insertCmd.PropertyValues.Add(new PropertyValue("LandValue", new Parameter("PLandValue")));
+
+  //Loop through the list of parcels to insert
+  foreach(Parcel p in parcels)
+  {
+      ParameterValueCollection paramVals = new ParameterValueCollection();
+
+      //Insert the parcel's name under the parameter "PName"
+      paramVals.Add(new ParameterValue("PName", new StringValue(p.Name)));
+
+      //Insert the parcel's address under the parameter "PAddress"
+      paramVals.Add(new ParameterValue("PAddress", new StringValue(p.Address)));
+
+      //Insert the parcel's land value under the parameter "PLandValue"
+      paramVals.Add(new ParameterValue("PLandValue", new DoubleValue(p.LandValue)));
+
+      insertCmd.BatchParameterValues.Add(paramVals);
+  }
+
+  //Execute the batched insert
+  using(IFeatureReader reader = insertCmd.Execute())
+  {
+      reader.Close();
+  }
+
+}}}
+