System.Data.SQLite

    }

    internal IndexColumn(Index parent, DataRow row)
    {
      _parent = parent;
      if (row != null)
      {
        if (!row.IsNull("COLUMN_NAME"))
          _column = row["COLUMN_NAME"].ToString();
        else
          _column = null;

        if (row.IsNull("SORT_MODE") == false && (string)row["SORT_MODE"] != "ASC")
          _mode = ColumnSortMode.Descending;

        if (row.IsNull("COLLATION_NAME") == false)
          _collate = row["COLLATION_NAME"].ToString().ToUpperInvariant();
      }
    }

                  try
                  {
                    using (SQLiteCommand cmdIndex = new SQLiteCommand(UnsafeNativeMethods.StringFormat(CultureInfo.InvariantCulture, "PRAGMA [{0}].index_info([{1}])", strCatalog, rdIndexes.GetString(1)), this))
                    using (SQLiteDataReader rdIndex = cmdIndex.ExecuteReader())
                    {
                      while (rdIndex.Read())
                      {
                        string columnName = rdIndex.IsDBNull(2) ? null : rdIndex.GetString(2);

                        row = tbl.NewRow();
                        row["CONSTRAINT_CATALOG"] = strCatalog;
                        row["CONSTRAINT_NAME"] = rdIndexes.GetString(1);
                        row["TABLE_CATALOG"] = strCatalog;
                        row["TABLE_NAME"] = rdIndexes.GetString(2);
                        row["COLUMN_NAME"] = columnName;
                        row["INDEX_NAME"] = rdIndexes.GetString(1);
                        row["ORDINAL_POSITION"] = ordinal; // rdIndex.GetInt32(1);

                        string collationSequence = null;
                        int sortMode = 0;
                        int onError = 0;

                        if (columnName != null)
                          _sql.GetIndexColumnExtendedInfo(strCatalog, rdIndexes.GetString(1), columnName, ref sortMode, ref onError, ref collationSequence);

                        if (String.IsNullOrEmpty(collationSequence) == false)
                          row["COLLATION_NAME"] = collationSequence;

                        row["SORT_MODE"] = (sortMode == 0) ? "ASC" : "DESC";
                        row["CONFLICT_OPTION"] = onError;

                        ordinal++;

                        if ((strColumn == null) || String.Compare(strColumn, columnName, StringComparison.OrdinalIgnoreCase) == 0)
                          tbl.Rows.Add(row);
                      }
                    }
                  }
                  catch (SQLiteException)
                  {
                  }

        }
        finally
        {
            if (!found && (connection != null))
                connection.SetCachedSetting(name, value);
        }
    }

    /// <summary>
    /// Converts the object value, which is assumed to have originated
    /// from a <see cref="DataRow" />, to a string value.
    /// </summary>
    /// <param name="value">
    /// The value to be converted to a string.
    /// </param>
    /// <returns>
    /// A null value will be returned if the original value is null -OR-
    /// the original value is <see cref="DBNull.Value" />.  Otherwise,
    /// the original value will be converted to a string, using its
    /// (possibly overridden) <see cref="Object.ToString" /> method and
    /// then returned.
    /// </returns>
    public static string GetStringOrNull(
        object value
        )
    {
        if (value == null)
            return null;

        if (value is string)
            return (string)value;

        if (Object.ReferenceEquals(value, DBNull.Value))
            return null;

        return value.ToString();
    }

    /// <summary>
    /// Determines if the specified textual value appears to be a
    /// <see cref="DBNull" /> value.
    /// </summary>
    /// <param name="text">
    /// The textual value to inspect.

                null,
                (string)row[SchemaTableColumn.BaseTableName],
                (string)rowIndexes["INDEX_NAME"],
                null
                });
              foreach (DataRow rowColumnIndex in tblIndexColumns.Rows)
              {
                if (String.Compare(SQLiteConvert.GetStringOrNull(rowColumnIndex["COLUMN_NAME"]), strColumn, StringComparison.OrdinalIgnoreCase) == 0)
                {
                  //
                  // BUGFIX: Make sure that we only flag this column as "unique"
                  //         if we are not processing of some kind of multi-table
                  //         construct (i.e. a join) because in that case we must
                  //         allow duplicate values (refer to ticket [7e3fa93744]).
                  //

                  using (DataTable indexColumns = cnn.GetSchema("IndexColumns", new string[] { pair.Key, null, table, (string)preferredRow["INDEX_NAME"] }))
                  {
                    KeyQuery query = null;

                    List<string> cols = new List<string>();
                    for (int x = 0; x < indexColumns.Rows.Count; x++)
                    {
                      string columnName = SQLiteConvert.GetStringOrNull(
                          indexColumns.Rows[x]["COLUMN_NAME"]);

                      bool addKey = true;
                      // If the column in the index already appears in the query, skip it
                      foreach (DataRow row in schema.Rows)
                      {
                        if (row.IsNull(SchemaTableColumn.BaseColumnName))
                          continue;

                        if ((string)row[SchemaTableColumn.BaseColumnName] == columnName &&
                            (string)row[SchemaTableColumn.BaseTableName] == table &&
                            (string)row[SchemaTableOptionalColumn.BaseCatalogName] == pair.Key)
                        {
                          indexColumns.Rows.RemoveAt(x);
                          x--;
                          addKey = false;
                          break;
                        }
                      }
                      if (addKey == true)
                        cols.Add(columnName);
                    }

                    // If the index is not a rowid alias, record all the columns
                    // needed to make up the unique index and construct a SQL query for it
                    if ((string)preferredRow["INDEX_NAME"] != "sqlite_master_PK_" + table)
                    {
                      // Whatever remains of the columns we need that make up the index that are not
                      // already in the query need to be queried separately, so construct a subquery
                      if (cols.Count > 0)
                      {
                        string[] querycols = new string[cols.Count];
                        cols.CopyTo(querycols);
                        query = new KeyQuery(cnn, pair.Key, table, querycols);
                      }
                    }

                    // Create a KeyInfo struct for each column of the index
                    for (int x = 0; x < indexColumns.Rows.Count; x++)
                    {
                      string columnName = SQLiteConvert.GetStringOrNull(indexColumns.Rows[x]["COLUMN_NAME"]);
                      KeyInfo key = new KeyInfo();

                      key.rootPage = rootPage;
                      key.cursor = cursor;
                      key.database = database;
                      key.databaseName = pair.Key;
                      key.tableName = table;

} -cleanup {
  unset -nocomplain dataTable dataReader

  cleanupDb $fileName

  freeDbConnection

  unset -nocomplain column row result connection db fileName
} -constraints {eagle command.object monoBug28 command.sql compile.DATA SQLite\
System.Data.SQLite} -result {{ColumnName x} {IsKey True} {ColumnName y} {IsKey\
False}}}

###############################################################################

runSQLiteTestEpilogue