Changed DB to store node positions as Ordinals.

sql/connection.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef SQL_CONNECTION_H_
 #define SQL_CONNECTION_H_
 
 #include <map>
 #include <set>
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/memory/ref_counted.h"
 #include "base/threading/thread_restrictions.h"
 #include "base/time.h"
 #include "sql/sql_export.h"
 
 class FilePath;
 struct sqlite3;
 struct sqlite3_stmt;
 
 namespace sql {
 
 class Statement;
 
+// Possible return values from ColumnType in a statement. These should match
+// the values in sqlite3.h.
+enum ColType {
+  COLUMN_TYPE_INTEGER = 1,
+  COLUMN_TYPE_FLOAT = 2,
+  COLUMN_TYPE_TEXT = 3,
+  COLUMN_TYPE_BLOB = 4,
+  COLUMN_TYPE_NULL = 5,
+};
+
 // Uniquely identifies a statement. There are two modes of operation:
 //
 // - In the most common mode, you will use the source file and line number to
 //   identify your statement. This is a convienient way to get uniqueness for
 //   a statement that is only used in one place. Use the SQL_FROM_HERE macro
 //   to generate a StatementID.
 //
 // - In the "custom" mode you may use the statement from different places or
 //   need to manage it yourself for whatever reason. In this case, you should
 //   make up your own unique name and pass it to the StatementID. This name
@@ skipping 245 matching lines @@
 
   // Returns true if the given table exists.
   bool DoesTableExist(const char* table_name) const;
 
   // Returns true if the given index exists.
   bool DoesIndexExist(const char* index_name) const;
 
   // Returns true if a column with the given name exists in the given table.
   bool DoesColumnExist(const char* table_name, const char* column_name) const;
 
+  // Returns the type/affinity of the given column in the given table.
+  ColType GetColumnType(char* table_name, int column_index) const;
+
   // Returns sqlite's internal ID for the last inserted row. Valid only
   // immediately after an insert.
   int64 GetLastInsertRowId() const;
 
   // Returns sqlite's count of the number of rows modified by the last
   // statement executed. Will be 0 if no statement has executed or the database
   // is closed.
   int GetLastChangeCount() const;
 
   // Errors --------------------------------------------------------------------
@@ skipping 144 matching lines @@
   // This object handles errors resulting from all forms of executing sqlite
   // commands or statements. It can be null which means default handling.
   scoped_refptr<ErrorDelegate> error_delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(Connection);
 };
 
 }  // namespace sql
 
 #endif  // SQL_CONNECTION_H_