RemoveRelation Method

Overview

The RemoveRelation method removes a relation from data set by relation name.

Declaration

/// <summary>
/// Removes relation from data set
/// </summary>
/// <param name="relationName">Relation name</param>
public void RemoveRelation(string relationName)

Namespace and Assembly

Namespace: PocoDataSet.Data
Assembly: PocoDataSet.Data.dll

Usage Example

// 1. Create new data set
IDataSet dataSet = DataSetFactory.CreateDataSet();

// 2. Add parent Customer table with Id primary key
IDataTable customerDataTable = dataSet.AddNewTable("Customer");
customerDataTable.AddColumn("Id", DataTypeNames.INT32, false, true);
customerDataTable.AddColumn("Name", DataTypeNames.STRING);

// 3. Add child Order table with CustomerId foreign key
IDataTable orderDataTable = dataSet.AddNewTable("Order");
orderDataTable.AddColumn("Id", DataTypeNames.INT32, true);
orderDataTable.AddColumn("CustomerId", DataTypeNames.INT32, false, false, true);
orderDataTable.AddColumn("Status", DataTypeNames.STRING);

// 4. Add relation between Customer and Order tables: Customer.Id -> Order.CustomerId
dataSet.AddRelation("CustomerOrder", "Customer", "Id", "Order", "CustomerId");

// Now relation navigation works (see GetChildRows / TryGetParentRow docs).
bool hasRelation = dataSet.ContainsRelation("CustomerOrder"); // true

// 5. Call RemoveRelation method to remove relation from data set
dataSet.RemoveRelation("CustomerOrder");

// Observe that relation was removed from data set.
bool hasRelation = dataSet.ContainsRelation("CustomerOrder"); // flase

 

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Business Process Programming in .Net
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