build sql as a component - this will help ensure there is only one copy

sql/connection.h

 // Copyright (c) 2011 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_
 #pragma once
 
 #include <map>
 #include <set>
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/memory/ref_counted.h"
 #include "base/time.h"
+#include "sql/sql_export.h"
 
 class FilePath;
 struct sqlite3;
 struct sqlite3_stmt;
 
 namespace sql {
 
 class Statement;
 
 // Uniquely identifies a statement. There are two modes of operation:
@@ skipping 43 matching lines @@
 #define SQL_FROM_HERE sql::StatementID(__FILE__, __LINE__)
 
 class Connection;
 
 // ErrorDelegate defines the interface to implement error handling and recovery
 // for sqlite operations. This allows the rest of the classes to return true or
 // false while the actual error code and causing statement are delivered using
 // the OnError() callback.
 // The tipical usage is to centralize the code designed to handle database
 // corruption, low-level IO errors or locking violations.
-class ErrorDelegate : public base::RefCounted<ErrorDelegate> {
+class SQL_EXPORT ErrorDelegate : public base::RefCounted<ErrorDelegate> {
  public:
   ErrorDelegate();
 
   // |error| is an sqlite result code as seen in sqlite\preprocessed\sqlite3.h
   // |connection| is db connection where the error happened and |stmt| is
   // our best guess at the statement that triggered the error.  Do not store
   // these pointers.
   //
   // |stmt| MAY BE NULL if there is no statement causing the problem (i.e. on
   // initialization).
   //
   // If the error condition has been fixed an the original statement succesfuly
   // re-tried then returning SQLITE_OK is appropiate; otherwise is recomended
   // that you return the original |error| or the appropiae error code.
   virtual int OnError(int error, Connection* connection, Statement* stmt) = 0;
 
  protected:
   friend class base::RefCounted<ErrorDelegate>;
 
   virtual ~ErrorDelegate();
 };
 
-class Connection {
+class SQL_EXPORT Connection {
  private:
   class StatementRef;  // Forward declaration, see real one below.
 
  public:
   // The database is opened by calling Open[InMemory](). Any uncommitted
   // transactions will be rolled back when this object is deleted.
   Connection();
   ~Connection();
 
   // Pre-init configuration ----------------------------------------------------
@@ skipping 265 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_