Indexes

You can retrieve information on indexes, such as the primary keys, by querying the Indexes collection.

Retrieving Primary Key Information

To retrieve this schema collection, call the GetSchema method of the CompositeConnection class. You can restrict the results by table name. The following example retrieves the primary key of the TDV table Products.

C#

String connectionString = "Host=myHost;Domain=myDomain;DataSource=myDataSource;User=myUser;Password=myPassword";

using (CompositeConnection conn = new CompositeConnection(connectionString)) {

  conn.Open();

  DataTable databaseSchema = conn.GetSchema("Indexes", new string[] {"Products"});

  foreach (DataRow row in databaseSchema.Rows) {

    Console.WriteLine(row["INDEX_NAME"]);

    Console.WriteLine(row["PRIMARY"]);

  }

}

VB.NET

 

Dim connectionString As String = "Host=myHost;Domain=myDomain;DataSource=myDataSource;User=myUser;Password=myPassword"

Using conn As New CompositeConnection(connectionString)

  conn.Open()

  Dim databaseSchema As DataTable = conn.GetSchema("Indexes",  New String() {"Products"})

  For Each row As DataRow In databaseSchema.Rows

    Console.WriteLine(row("INDEX_NAME"))

    Console.WriteLine(row("PRIMARY"))

  Next

End Using

Columns Returned

The Indexes schema collection contains the following columns:

Column Name	Data Type	Description
INDEX_CATALOG	System.String	The name of the database containing the index.
INDEX_SCHEMA	System.String	The name of the schema containing the index.
TABLE_NAME	System.String	The name of the table containing the index.
INDEX_NAME	System.String	The name of the index.
UNIQUE	System.Boolean	Whether the index is unique.
PRIMARY	System.Boolean	Whether the index is a primary key.
TYPE	System.Int32	An integer value corresponding to the index type: statistic (0), clustered (1), hashed (2), or other (3).
COMMENT	System.String	A description of the index.