AddRelation(String,String,String,String,String) Method

In This Topic

Adds a relation between two commands/tables.

Syntax

Visual Basic
C#
C++/CLI

'Declaration
 
Public Overloads Sub AddRelation( _
   ByVal relationName As String, _
   ByVal parentTableName As String, _
   ByVal childTableName As String, _
   ByVal parentColumnName As String, _
   ByVal childColumnName As String _
)

public void AddRelation( 
   string relationName,
   string parentTableName,
   string childTableName,
   string parentColumnName,
   string childColumnName
)

public:
void AddRelation( 
   String^ relationName,
   String^ parentTableName,
   String^ childTableName,
   String^ parentColumnName,
   String^ childColumnName
)

Parameters

relationName: Name for the relation. May appear in the UI if multiple relations exist between the same two tables.
parentTableName: Name of the parent table.
childTableName: Name of the child table.
parentColumnName: Column name of the parent table. See remark section for composite key fields.
childColumnName: Column name of the child table. See remark section for composite key fields.

Remarks

To support composite primary keys (the primary key of each table consists of two or more columns) for the relation, you can simple separate the individual column names by tab character '\t' for the parameters parentColumName and childColumnName.

Example

C#
VB.NET

OleDbCommand command = new OleDbCommand("Select * from [Customers]", conn);
OleDbCommand command2 = new OleDbCommand("Select * from [Orders]", conn);

DbCommandSetDataProvider provider = new DbCommandSetDataProvider();
provider.AddCommand(command, "Customers");
provider.AddCommand(command2, "Orders");
provider.AddRelation("Customers2Orders", "Customers", "Orders", "CustomerID", "CustomerID");

LL.DataSource = provider;
LL.Design();

Dim command As New OleDbCommand("Select * from [Customers]", conn)
Dim command2 As New OleDbCommand("Select * from [Orders]", conn)

Dim provider As New DbCommandSetDataProvider()
provider.AddCommand(command, "Customers")
provider.AddCommand(command2, "Orders")
provider.AddRelation("Customers2Orders", "Customers", "Orders", "CustomerID", "CustomerID")

LL.DataSource = provider
LL.Design()

Requirements

Platforms: Windows 10 (Version 21H2 - 23H2), Windows 11 (21H2 - 22H2), Windows Server 2016 - 2022
.NET: .NET Framework 4.8, .NET 6, .NET 7, .NET 8

Reference

DbCommandSetDataProvider Class
DbCommandSetDataProvider Members
Overload List

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