Projects/PIM/MS Windows/SQLite Folder Indices

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There are issues with locking index files for KMail folders and mmap()/munmap() operations on Windows. Therefore, SQLite-based indices are in development. This page presents detailed development notes for this task.

Started: jstaniek 11:35, 23 April 2008 (CEST)



  • we call the new implementation SQLite mode for short
  • SQLite 3.5.4 is used, as provided by emerge sqlite module; we should not allow using much older versions of sqlite, e.g. 3.1 because of file format differences
  • we are using one .index.db file per account, not folder
  • kmfolderindex_sqlite.cpp is created and edited as a copy of kmfolderindex.cpp; kmfolderindex.cpp is not compiled in SQLite mode
  • kmfolderindex.h is a common header for both kmfolderindex*.cpp implementations
  • kmailprivate links to sqlite library, and KMAIL_SQLITE_INDEX is defined to enable #ifdef'd code


api docs

  • 2008-04-23
    • mIndexId unused - removed as well as serialIndexId()
    • indexLocation(): added .db suffix to indicate the index is sqlite-based
    • INDEX_VERSION is written and checked using 'PRAGMA user_version = <integer>' command [1]
    • we do not use temporary filenames, e.g. in writeIndex(): SQLite takes care about safe storage
    • updateIndex() no changes, we're changing implementation of KMMsgBase::syncIndexString() and writeIndex() instead


api docs

  • 2008-04-23
    • move syncIndexString() to KMFolderIndex, where we can impleemnt it for SQLite differently

Status of porting to SQLite

KMFolderIndex:indexLocation() yes added .db suffix to indicate the index is sqlite-based

Open Question

  • should we port .sorted files to sqlite too? (possibly to the same .db file)

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