Schema Details

In This Topic

The ADO.NET provider for OData supports schema discovery using ADO.NET classes or SQL statements to the system tables. This is done through the GetSchema method of the C1ODataConnection class, optionally specifying schema name and restriction values.

In the code example below, the GetSchema method is called firstly to return the Tables of the database, then called again to return the Columns of a specific datatable.

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using (var connection = new C1ODataConnection(connstr)) { connection.Open(); // Get a list of tables DataTable databaseTables = connection.GetSchema("Tables"); Console.WriteLine("List of Tables in database:\n"); foreach (DataRow row in databaseTables.Rows) { // Print table names Console.WriteLine(row["TableName"]); } // Get column names in a table DataTable datatableColumns = connection.GetSchema("Columns", new string[] { "Products" }); Console.WriteLine("\n Products table columns:"); foreach (DataRow column in datatableColumns.Rows) { // Print column properties Console.Write(column["ColumnName"]); Console.Write("\t" + column["DataType"]); Console.Write("\t" + column["AllowDbNULL"] + "\n"); } }

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using (var connection = new C1ODataConnection(connstr))
{
    connection.Open();

    // Get a list of tables
    DataTable databaseTables = connection.GetSchema("Tables");
    Console.WriteLine("List of Tables in database:\n");
    foreach (DataRow row in databaseTables.Rows)
    {
        // Print table names
        Console.WriteLine(row["TableName"]);
    }

    // Get column names in a table
    DataTable datatableColumns = connection.GetSchema("Columns", new string[] { "Products" });
    Console.WriteLine("\n Products table columns:");
    foreach (DataRow column in datatableColumns.Rows)
    {
        // Print column properties
        Console.Write(column["ColumnName"]);
        Console.Write("\t" + column["DataType"]);
        Console.Write("\t" + column["AllowDbNULL"] + "\n");
    }
}

Alternatively to the GetSchema method, the GetSchemaTable method of the C1DataReader class can be used, which returns a DataTable with the definitions of the column metadata.