Move app/sql/* files to sql/ directory.

app/sql/meta_table.h

-// Copyright (c) 2009 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 APP_SQL_META_TABLE_H_
-#define APP_SQL_META_TABLE_H_
-#pragma once
-
-#include <string>
-
-#include "base/basictypes.h"
-
-namespace sql {
-
-class Connection;
-class Statement;
-
-class MetaTable {
- public:
-  MetaTable();
-  ~MetaTable();
-
-  // Returns true if the 'meta' table exists.
-  static bool DoesTableExist(Connection* db);
-
-  // Initializes the MetaTableHelper, creating the meta table if necessary. For
-  // new tables, it will initialize the version number to |version| and the
-  // compatible version number to |compatible_version|.
-  bool Init(Connection* db, int version, int compatible_version);
-
-  // Resets this MetaTable object, making another call to Init() possible.
-  void Reset();
-
-  // The version number of the database. This should be the version number of
-  // the creator of the file. The version number will be 0 if there is no
-  // previously set version number.
-  //
-  // See also Get/SetCompatibleVersionNumber().
-  void SetVersionNumber(int version);
-  int GetVersionNumber();
-
-  // The compatible version number is the lowest version of the code that this
-  // database can be read by. If there are minor changes or additions, old
-  // versions of the code can still work with the database without failing.
-  //
-  // For example, if an optional column is added to a table in version 3, the
-  // new code will set the version to 3, and the compatible version to 2, since
-  // the code expecting version 2 databases can still read and write the table.
-  //
-  // Rule of thumb: check the version number when you're upgrading, but check
-  // the compatible version number to see if you can read the file at all. If
-  // it's larger than you code is expecting, fail.
-  //
-  // The compatible version number will be 0 if there is no previously set
-  // compatible version number.
-  void SetCompatibleVersionNumber(int version);
-  int GetCompatibleVersionNumber();
-
-  // Set the given arbitrary key with the given data. Returns true on success.
-  bool SetValue(const char* key, const std::string& value);
-  bool SetValue(const char* key, int value);
-  bool SetValue(const char* key, int64 value);
-
-  // Retrieves the value associated with the given key. This will use sqlite's
-  // type conversion rules. It will return true on success.
-  bool GetValue(const char* key, std::string* value);
-  bool GetValue(const char* key, int* value);
-  bool GetValue(const char* key, int64* value);
-
- private:
-  // Conveniences to prepare the two types of statements used by
-  // MetaTableHelper.
-  bool PrepareSetStatement(Statement* statement, const char* key);
-  bool PrepareGetStatement(Statement* statement, const char* key);
-
-  Connection* db_;
-
-  DISALLOW_COPY_AND_ASSIGN(MetaTable);
-};
-
-}  // namespace sql
-
-#endif  // APP_SQL_META_TABLE_H_