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readme.md

wxSQLite3 - a lightweight wrapper for SQLite

wxSQLite3 is a C++ wrapper around the public domain SQLite 3.x database and is specifically designed for use in programs based on the wxWidgets library.

wxSQLite3 does not try to hide the underlying database, in contrary almost all special features of the current SQLite3 version are supported, like for example the creation of user defined scalar or aggregate functions.

Since SQLite stores strings in UTF-8 encoding, the wxSQLite3 methods provide automatic conversion between wxStrings and UTF-8 strings. This works best for the Unicode builds of wxWidgets. In ANSI builds the current locale conversion object (wxConvCurrent) is used for conversion to/from UTF-8. Special care has to be taken if external administration tools are used to modify the database contents, since not all of these tools operate in Unicode or UTF-8 mode.

Since version 1.7.0 wxSQLite3 includes a key-based SQLite3 encryption extension using AES encryption. The decision whether to use 128 bit or 256 bit AES encryption had to be made at compile time. Starting with version 4.0.0 the encryption extension allows to select the cipher scheme at runtime.

Currently the following encryption schemes are supported:

Important Notes

With the release of SQLite version 3.32.0 on May 22, 2020 critical changes to the public SQLite code finally took officially effect, although they weren't officially announced. They were introduced on Feb 7, 2020: "Simplify the code by removing the unsupported and undocumented SQLITE_HAS_CODEC compile-time option". As a consequence, updating the wxSQLite3 encryption extension to support SQLite version 3.32.0 and later was no longer possible.

Since August 2020 a new implementation of an encryption extension, capable of supporting SQLite version 3.32.0 and later, is available as a separate project, SQLite3 Multiple Ciphers. Starting with the release of wxSQLite3 4.6.0 this new implementation will be used.

Table of Contents

Version history

  • 4.6.0 - August 2020
    • Use SQLite encryption extension SQLite3 Multiple Ciphers
    • Upgrade to SQLite version 3.33.0
    • Added support for System.Data.SQLite's RC4 encryption
  • 4.5.1 - January 2020
    • Upgrade to SQLite version 3.31.1
  • 4.5.0 - January 2020
    • Upgrade to SQLite version 3.31.0
    • Modified API for wxSQLite3Database::CreateFunction methods
  • 4.4.8 - October 2019
    • Upgrade to SQLite version 3.30.1
    • Adjusted encryption extension to support SQLite's shared cache mode
  • 4.4.7 - October 2019
    • Upgrade to SQLite version 3.30.0
  • 4.4.6 - September 2019
    • Fixed missing cipher application in method wxSQLite3Database::ReKey
  • 4.4.5 - August 2019
    • Fixed broken compatibility with wxWidgets 2.8.12
  • 4.4.4 - August 2019
    • Upgrade to SQLite version 3.29.0
    • Added SQLite logging support
    • Added build support for VS2019
    • Added CMake support (PR #63)
    • Updated build files to overcome problems with static builds (issue #73)
    • Eliminated duplication of error messages for different wxWidgets builds (PR #64)
    • Fixed missing call to progress callback in wxSQLite3Database::Restore (PR #66)
    • Fixed issue #58 with silently failing wxSQLite3Transaction::Commit method
    • Fixed issue with named collections which could result in crashes (PR #59)
  • 4.4.3 - May 2019
    • Upgrade to SQLite version 3.28.0
  • 4.4.2 - February 2019
    • Upgrade to SQLite version 3.27.2
  • 4.4.1 - February 2019
    • Upgrade to SQLite version 3.27.1
  • 4.4.0 - December 2018
    • Upgrade to SQLite version 3.26.0
    • Added support for the SQLCipher 4 database format
  • 4.3.0 - November 2018
    • Upgrade to SQLite version 3.25.3
    • Adjusted encryption extension to support cipher configuration via database URI
  • 4.2.0 - October 2018
    • Added method wxSQLite3Database::GetKeySalt to access the key salt of encrypted databases
    • Fixed memory leaks in methods wxSQLite3ResultSet::GetExpandedSQL and wxSQLite3Statement::GetExpandedSQL
    • Adjusted encryption extension to support raw key (and salt) for the ChaCha20 (sqleet) encryption scheme
  • 4.1.1 - October 2018
    • Upgrade to SQLite version 3.25.2
  • 4.1.0 - September 2018
    • Upgrade to SQLite version 3.25.1
    • Added support for SQL window functions
    • Adjusted encryption extension to check for matching page sizes on rekeying a database
  • 4.0.4 - June 2018
    • Upgrade to SQLite version 3.24.0
  • 4.0.3 - April 2018
    • Adjusted encryption extension to better support the SQLite backup API
  • 4.0.2 - April 2018
    • Upgrade to SQLite version 3.23.1
  • 4.0.1 - April 2018
    • Fixed a bug in the rekeying function of the encryption extension
  • 4.0.0 - April 2018
    • Added multi-cipher support
    • Added methods for attaching/detaching databases
    • Cleaned up code using statement buffers
  • 3.5.9 - January 2018
    • Upgrade to SQLite version 3.22.0
  • 3.5.8 - November 2017
    • Upgrade to SQLite version 3.21.0
  • 3.5.7 - September 2017
    • Upgrade to SQLite version 3.20.1
  • 3.5.6 - August 2017
    • Upgrade to SQLite version 3.20.0
    • Added support for persistent prepared statements
    • Added support for binding pointers (new SQLite pointer-binding interface)
    • Added several SQLite extensions (csv, sha3, carray, fileio, series) for the included SQLite library
    • Modified build files to expose the parameter SQLITE_MAX_ATTACHED to allow easier adjustment of the maximum number of attached databases
  • 3.5.5 - June 2017
    • Upgrade to SQLite version 3.19.3
  • 3.5.4 - June 2017
    • Upgrade to SQLite version 3.19.2
  • 3.5.3 - March 2017
    • Upgrade to SQLite version 3.18.0
    • Minor modification to wxsqlite3.pc.in to fix issue with pkgconfig tool
  • 3.5.2 - March 2017
    • Upgrade to SQLite version 3.17.0
    • Fixed minor issue in SQLite encryption extension related to symbol SQLITE_DEBUG
    • Modified build system for GNU make (support monolithic wxWidgets build)
  • 3.5.1 - February 2017
    • Added version information as Windows resource for DLL builds on Windows
    • Cleaned up premake5 build files for Visual C++ (corrected debug environment settings)
    • Resolved wxWidgets library dependencies for Visual C++ using wxWidgets' special setup.h for MSVC
  • 3.5.0 - January 2017
    • Upgrade to SQLite version 3.16.2
    • SQLite3 library now integrated part of wxSQLite3
    • Overhaul of build system
  • 3.4.1 - October 2016
    • Upgrade to SQLite version 3.15.0
  • 3.4.0 - August 2016
    • Upgrade to SQLite version 3.14.1
    • Added method wxSQLite3Statement::GetExpandedSQL
    • Added method wxSQLite3ResultSet::GetExpandedSQL
    • Started to modify the build system to compile and statically link the SQLite3 library together with wxSQLite3
    • Added the CSV extension module as part of the SQLite3 library with encryption extension
  • 3.3.1 - April 2016
    • Upgrade to SQLite version 3.12.1
    • Added method wxSQLite3Database::GetSystemErrorCode
  • 3.3.0 - December 2015
    • Upgrade to SQLite version 3.9.2 (including adjusted SQLite amalgamation source to fix problem with the user authentication module)
    • Transition from SourceForge to GitHub
  • 3.2.1 - March 2015
    • Upgrade to SQLite version 3.8.8.3
    • Fixed a bug in method GetParamName
  • 3.2.0 - December 2014
    • Upgrade to SQLite version 3.8.7.4
    • Added support for the SQLite user authentication module
  • 3.1.1 - June 2014
    • Upgrade to SQLite version 3.8.5
  • 3.1.0 - May 2014
    • Upgrade to SQLite version 3.8.4.3
    • Added flag isDeterministic to method wxSQLite3Database::CreateFunction
    • Added new GUI sample
    • Changed implementation of encryption extension (see readme file in sqlite3 subfolder)
  • 3.0.6 - December 2013
    • Upgrade to SQLite version 3.8.2
  • 3.0.5 - September 2013
    • Upgrade to SQLite version 3.8.0.2
    • Added support for setting the temporary directory for SQLite on Windows
  • 3.0.4 - August 2013
    • Upgrade to SQLite version 3.8.0
    • Added support for querying performance characteristics of prepared statements
  • 3.0.3 - March 2013
    • Upgrade to SQLite version 3.7.16
  • 3.0.2 - Dezember 2012
    • Upgrade to SQLite version 3.7.15.1
    • Corrected an internal SQLite data structure to avoid compile time warnings
    • Changed method wxSQLite3Exception::ErrorCodeAsString to return the error messages provided by SQLite
  • 3.0.1 - November 2012
    • Upgrade to SQLite version 3.7.14.1
    • Cleaned up and optimized Finalize methods
    • Modified wxSQLite3Database::Close to avoid potential memory leaks
    • Added method wxSQLite3Database::GetWrapperVersion
    • Added method wxSQLite3Database::IsReadOnly
    • Added method wxSQLite3Statement::BindUnixDateTime
    • Added method wxSQLite3ResultSet::GetUnixDateTime
    • Added method wxSQLite3ResultSet::GetAutomaticDateTime
    • Fixed a potential memory leak in method wxSQLite3Database::ExecuteUpdate
    • Added a wxsqlite3.pc file on request of the Fedora Project developers
    • Replaced assert by wxASSERT in wxSQLite3Transaction constructor
  • 3.0.0 - January 2012
    • Upgrade to SQLite version 3.7.10
    • Added method wxSQLite3Database::Vacuum
    • Added method wxSQLite3Database::GetDatabaseFilename
    • Added method wxSQLite3Database::ReleaseMemory
    • Added method wxSQLite3ResultSet::CursorMoved
    • Added method wxSQLite3Statement::IsBusy
    • Fixed a bug in method operator= of wxSQLite3StringCollection causing an endless recursion on assignment
    • Dropped the concept of SQLite3 pointer ownership in favor of reference counted pointers allowing much more flexible use of wxSQLite3 classes
    • Modified SQLite3 encryption extension (defining int64 datatype for SHA2 algorithm)
    • Dropped dbadmin sample from build files
    • Added Premake support for SQLite3 library with encryption support and for wxSQLite3 (experimental)
  • 2.1.3 - August 2011
    • Corrected default behaviour for attached databases in case of an encrypted main database. (Now the attached database uses the same encryption key as the main database if no explicit key is given. Previously the attached database remained unencrypted.)
    • Added an optional progress callback for metheods Backup & Restore
    • Added method SetBackupRestorePageCount to set the number of pages to be copied in one cycle of the backup/restore process
  • 2.1.2 - July 2011
    • Upgrade to SQLite version 3.7.7.1
    • Modified wxSQLite3Transaction class to make it exception safe
  • 2.1.1 - April 2011
    • Upgrade to SQLite version 3.7.6.1
    • Added convenience method wxSQLite3Statement::ExecuteScalar
    • Changed write-ahead log checkpoint method to new version (v2)
  • 2.1.0 - March 2011
    • Upgrade to SQLite version 3.7.5
    • Added wxSQLite+, a database administration application written by Fred Cailleau-Lepetit, as a GUI sample for wxSQLite3. Minor adjustments were applied to make wxSQLite+ compatible with wxWidgets 2.9.x. To compile and link wxSQLite+ successfully using wxWidgets 2.8.x it is required to build the "stc" library (scintilla) in the "contrib" folder of wxWidgets. Please note that wxSQLite+ is under GPL license.
  • 2.0.2 - December 2010
    • Upgrade to SQLite version 3.7.4
  • 2.0.1 - October 2010
    • Upgrade to SQLite version 3.7.3
    • Added parameter transferStatementOwnership to method wxSQLite3Statement::ExecuteQuery to allow using the returned result set beyond the life time of the wxSQLite3Statement instance
  • 2.0.0.1 - August 2010
    • Upgrade to SQLite version 3.7.0.1
    • Added missing function interfaces in wxsqlite3dyn.h
    • Adjusted code to eliminate a reference to sqlite3_mprintf
  • 2.0.0 - July 2010
    • Upgrade to SQLite version 3.7.0
    • Fixed a bug in class wxSQLite3ResultSet
    • Added support for SQLite's write-ahead log journal mode
    • Added support for named collections (see class wxSQLite3NamedCollection)
    • Changed UTF-8 string handling to use methods To/FromUTF8 of the wxString class (requires wxWidgets 2.8.4 or higher)
    • Compatible with wxWidgets 2.9.1
  • 1.9.9 - March 2010
    • Upgrade to SQLite version 3.6.23
    • Fixed a bug when compiling for dynamic loading of SQLite
    • Added static methods to class wxSQLite3Database for accessing the run-time library compilation options diagnostics
    • Added mathod FormatV to class wxSQLite3StatementBuffer
  • 1.9.8 - February 2010
    • Upgrade to SQLite version 3.6.22
    • Fixed a bug when compiling without precompiled header support (by including wx/arrstr.h)
    • Added experimental support for 256 bit AES encryption to the optional key based encryption extension
  • 1.9.7 - November 2009
    • Upgrade to SQLite version 3.6.20
    • Added methods to query, enable or disable foreign key support
  • 1.9.6 - September 2009
    • Upgrade to SQLite version 3.6.18
    • Added method to get the SQLite library source id
    • Added flags parameter to wxSQLite3Database::Open to allow additional control over the database connection (see http://www.sqlite.org/c3ref/open.html for further information)
    • Fixed a potential memory leak in wxSQLite3Statement class
    • Converted encryption extension from C++ to pure C to make it compatible with the SQLite amalgamation.
  • 1.9.5 - February 2009
    • Upgrade to SQLite version 3.6.11
    • Added user defined function class for REGEXP operator
    • Added support for SQLite backup/restore API, introduced with SQLite 3.6.11
  • 1.9.4 - January 2009
    • Upgrade to SQLite version 3.6.10
    • Added support for SQLite savepoints, introduced with SQLite 3.6.8
    • Added IsOk methods to several classes
  • 1.9.3 - Dezember 2008
    • Upgrade to SQLite version 3.6.7
    • Fixed a bug in method wxSQLite3Table::GetDouble (conversion from string to double failed in non-US locales)
    • Build system upgraded using Bakefile 0.2.5
  • 1.9.2 - November 2008
    • Upgrade to SQLite version 3.6.6
    • Added RAII transaction class (see docs for details)
  • 1.9.1 - September 2008
    • Upgrade to SQLite version 3.6.2
    • Introduced own step counting for aggregate user functions since the sqlite3_aggregate_count function is now deprecated.
    • Enhanced wxSQLite3Database::TableExists method to query an attached database for existence of a table or to query all open databases.
  • 1.9.0 - July 2008
    • Upgrade to SQLite version 3.6.0
    • The optional key based encryption support has been adapted to support SQLite version 3.6.0.
    • Added static methods to initialize and shutdown the SQLite library.
    • Changed build system to support static library build against shared wxWidgets build on Linux.
    • Changed behaviour of Close method of class wxSQLite3Database to finalize all unfinalized prepared statements.
  • 1.8.5 - June 2008
    • Upgrade to SQLite version 3.5.9
    • Integration of the optional key based encryption support into SQLite has been made easier. Changes to original SQLite source files are no longer necessary.
  • 1.8.4 - April 2008
    • Upgrade to SQLite version 3.5.8
    • Added support for accessing database limits
    • Changed method TableExists to check a table name case insensitive
    • Fixed several minor issues in the build files.
  • 1.8.3 - January 2008
    • Added support for shared cache mode
    • Added support for access to original SQL statement for prepared statements (requires SQLite 3.5.3 or above)
    • Fixed broken SQLite DLLs
  • 1.8.2 - Dezember 2007
    • Upgrade to SQLite version 3.5.4
    • Fixed a bug in in wxSQLite3Database::Begin (wrong transaction type)
  • 1.8.1 - November 2007
    • Fixed a bug in in wxSQLite3Database::Close (resetting flag m_isEncrypted)
    • Eliminated several compile time warnings (regarding unused parameters)
    • Fixed a compile time bug in wxSQLite3Database::GetBlob (missing explicit type cast)
  • 1.8.0 - November 2007
    • Upgrade to SQLite version 3.5.2
    • Support for SQLite incremental BLOBs
    • Changed source code in the SQLite3 encryption extension to eliminate several warnings
    • Changed default wxWidgets version to 2.8.x
    • Adjusted sources for SQLite encryption support are included for all SQLite version from 3.3.1 up to 3.5.2
    • SQLite link libraries for MinGW on Windows are included
    • Added WXMAKINGLIB_WXSQLITE3 compile time option to support building wxSQLite3 as a static library while using the shared libraries of wxWidgets.
  • 1.7.3 - May 2007
    • Upgrade to SQLite version 3.3.17
    • Fixed a bug in the SQLite3 encryption extension (MD5 algorithm was not aware of endianess on big-endian platforms, resulting in non-portable database files)
  • 1.7.2 - February 2007
    • Upgrade to SQLite version 3.3.11
    • Support for loadable extensions is now optional
    • Check for optional wxSQLite3 features at runtime
    • wxSQLite3 API independent of optional features
  • 1.7.1 - January 2007
    • Fixed a bug in the key based database encryption feature (The call to sqlite3_rekey in wxSQLite3Database::ReKey could cause a program crash, when used to encrypt a previously unencrypted database.)
  • 1.7.0 - January 2007
    • Upgrade to SQLite version 3.3.10
    • Added support for BLOBs as wxMemoryBuffer objects
    • Added support for loadable extensions
    • Optional support for key based database encryption
  • 1.6.0 - July 2006
    • Added support for user-defined collation sequences
  • 1.5.3 - June 2006
    • Upgrade to SQLite version 3.3.6
    • Added support for optional SQLite meta data methods
  • 1.5.2 - March 2006
    • Fixed a bug in wxSQLite3Database::Prepare
    • Added wxSQLite3Database::IsOpen for convenience
  • 1.5.1 - February 2006
    • SQLite DLL upgraded to version 3.3.4
  • 1.5 - February 2006
    • Upgrade to SQLite version 3.3.3
    • Added support for commit, rollback and update callbacks
  • 1.4.2 - November 2005
    • Optimized code for wxString arguments
  • 1.4.1 - November 2005
    • Fixed a bug in TableExists, eliminated some compiler warnings
    • Changed handling of Unicode string conversion
    • Added support for different transaction types
  • 1.4 - November 2005
    • Optionally load SQLite library dynamically at run time
  • 1.3.1 - November 2005
    • Corrected wxSQLite3ResultSet::GetInt64,
    • Added wxSQLite3Table::GetInt64
  • 1.3 - October 2005
    • Added wxGTK build support
  • 1.2 - October 2005
    • Corrected error in wxSQLite3Table::FindColumnIndex
  • 1.1 - October 2005
    • Upgrade to SQLite version 3.2.7
  • 1.0 - July 2005
    • First public release

Installation

The build files for Windows platforms are now generated with Premake 5 (version Premake 5.0 alpha 15).

Ready to use project files are provided for Visual C++ 2010, 2012, 2013, 2015, 2017, and 2019. Additionally, GNU Makefiles are provided supporting for example MinGW-w64.

For Visual Studio 2010+ solutions it is possible to customize the build by creating a wx_local.props file in the build directory which is used, if it exists, by the projects. The settings in that file override the default values for the properties. The typical way to make the file is to copy wx_setup.props to wx_local.props and then edit locally.

For GNU Makefiles the file config.gcc serves the same purpose as the file wx_setup.props for Visual C++ projects.

The customization files wx_setup.props resp. config.gcc allow to customize certain settings like for example the version number and the root directory of the wxWidgets library.

wxMSW

When building on Win32 or Win64, you can use the makefiles or one of the Microsoft Visual Studio solution files in the build folder.

For Visual C++ the debugging properties are set up in such a way that debugging the sample applications should work right out of the box. For release builds you may need to copy the wxSQLite3 DLL or add the lib folder path to the Windows search path (PATH environment variable).

The SQLite3 library is now compiled as an integrated part of wxSQLite3. The advantage is that SQLite3 and wxSQLite3 are always compiled with matching configuration options. Additionally, the SQLite3 encryption extension is automatically enabled, too.

A precompiled SQLite shell program supporting encrypted databases is provided as a separate download. Use

PRAGMA KEY="encryption key";

to create or open an encrypted database. Use

ATTACH DATABASE x AS y KEY z;

to attach an encrypted database.

wxGTK

When building on an autoconf-based system (like Linux/GNU-based systems), the first setup is to recreate the configure script doing:

  autoreconf

Thereafter you should create a build directory

  mkdir build-gtk [or any other suitable name]
  cd build-gtk
  ../configure [here you should use the same flags you used to configure wxWidgets]
  make

Type ../configure --help for more info.

The autoconf-based system also supports a make install target which builds the library and then copies the headers of the component to /usr/local/include and the lib to /usr/local/lib.

Optional features

SQLite has many optional features and offers a number of optional extensions. The below table lists the features that are enabled for wxSQLite3 as default. For details, please see SQLite Compile Time Options.

In case of memory constraints it is of course possible to disable unneeded features. However, this will usually require to modify the build files.

Symbol Description
SQLITE_DQS Setting for the double-quoted string literal misfeature (default: disabled)
SQLITE_ENABLE_CARRAY C array extension
SQLITE_ENABLE_COLUMN_METADATA Access to meta-data about tables and queries
SQLITE_ENABLE_CSV CSV extension
SQLITE_ENABLE_DEBUG Enable additional debug features (default: off)
SQLITE_ENABLE_DESERIALIZE Option to enable the serialization interface
SQLITE_ENABLE_EXPLAIN_COMMENTS Enable additional comments in EXPLAIN output
SQLITE_ENABLE_FTS3 Version 3 of the full-text search engine
SQLITE_ENABLE_FTS3_PARENTHESIS Additional operators for query pattern parser
SQLITE_ENABLE_FTS4 Version 4 of the full-text search engine
SQLITE_ENABLE_FTS5 Version 5 of the full-text search engine
SQLITE_ENABLE_GEOPOLY Geopoly extension
SQLITE_ENABLE_JSON1 JSON SQL functions
SQLITE_ENABLE_REGEXP Regular expression extension
SQLITE_ENABLE_RTREE R*Tree index extension
SQLITE_ENABLE_EXTFUNC Extension with mathematical and string functions
SQLITE_ENABLE_FILEIO Extension with file I/O SQL functions
SQLITE_ENABLE_SERIES Series extension
SQLITE_ENABLE_SHA3 SHA3 extension
SQLITE_ENABLE_UUID Extension for handling handling RFC-4122 UUIDs
SQLITE_MAX_ATTACHED=10 Maximum Number Of Attached Databases (max. 125)
SQLITE_SECURE_DELETE Overwrite deleted content with zeros
SQLITE_SOUNDEX Enable soundex SQL function
SQLITE_THREADSAFE Setting the multithreading mode (default: serialized)
SQLITE_USE_URI Enable URI file names
SQLITE_USER_AUTHENTICATION User authentication extension

Key based database encryption support

The public release of SQLite contains hooks for key based database encryption, but the code for implementing this feature is not freely available. D. Richard Hipp offers a commercial solution (see http://www.hwaci.com/sw/sqlite/prosupport.html#crypto).

There exist other closed-source commercial solutions, among them:

Both use a slightly different encryption API, which is currently NOT supported by wxSQLite3.

For Windows based systems there exists an open source solution: System.Data.SQLite. For SQLite version 3.32.0 or higher encryption support has been dropped. However, the new encryption extension SQLite3 Multiple Ciphers allows to use this encryption scheme on all supported platforms.

wxSQLite3 uses now the new encryption extension SQLite3 Multiple Ciphers. Precompiled binaries of the SQLite3 DLL and the SQLite3 shell for Windows are now provided by this new separate project.

Using statically linked SQLite library on Windows

Starting with wxSQLite3 version 3.5.0 the SQLite3 library is compiled as an integrated part of wxSQLite3. A separate SQLite3 DLL is not required any longer.

License

wxSQLite3 is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License version 3 or later as published by the Free Software Foundation, with the wxWindows 3.1 exception.

Acknowledgements

The following people have contributed to wxSQLite3:

  • Vadim Zeitlin (revision of the build system)
  • Francesco Montorsi (enhancement of the build system)
  • Neville Dastur (enhancement of the method TableExists)
  • Tobias Langner (RAII class for managing transactions)
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