The sqlitecpp from 5l1v3r1

SQLiteC++

SQLiteC++ (SQLiteCpp) is a smart and easy to use C++ SQLite3 wrapper.

Keywords: sqlite, sqlite3, C, library, wrapper C++

About SQLiteC++:

SQLiteC++ offers an encapsulation around the native C APIs of SQLite, with a few intuitive and well documented C++ classes.

License:

Distributed under the MIT License (MIT) (See accompanying file LICENSE.txt or copy at http://opensource.org/licenses/MIT)

Note on redistribution of SQLite source files

As stated by the MIT License, you are welcome to reuse, modify, and redistribute the SQLiteCpp source code the way you want it to, be it a git submodule, a subdirectory, or a selection of some source files.

I would love a mention in your README, a web link to the SQLite repository, and a mention of the author, but none of those are mandatory.

About SQLite underlying library:

SQLite is a library that implements a serverless transactional SQL database engine. It is the most widely deployed SQL database engine in the world. All of the code and documentation in SQLite has been dedicated to the public domain by the authors. http://www.sqlite.org/about.html

The goals of SQLiteC++ are:

to offer the best of the existing simple C++ SQLite wrappers
to be elegantly written with good C++ design, STL, exceptions and RAII idiom
to keep dependencies to a minimum (STL and SQLite3)
to be portable
to be light and fast
to be thread-safe only as much as SQLite "Multi-thread" mode (see below)
to have a good unit test coverage
to use API names sticking with those of the SQLite library
to be well documented with Doxygen tags, and with some good examples
to be well maintained
to use a permissive MIT license, similar to BSD or Boost, for proprietary/commercial usage

It is designed using the Resource Acquisition Is Initialization (RAII) idiom (see http://en.wikipedia.org/wiki/Resource_Acquisition_Is_Initialization), and throwing exceptions in case of SQLite errors (exept in destructors, where assert() are used instead). Each SQLiteC++ object must be constructed with a valid SQLite database connection, and then is always valid until destroyed.

Supported platforms:

Developements and tests are done under the following OSs:

Ubuntu 14.04 (Travis CI)
Windows XP/10
OS X 10.11 (Travis CI)

And the following IDEs/Compilers

GCC 4.8.4, 4.9.3, 5.3.0 and 6.1.1 (C++03, C++11, C++14, C++1z)
Clang 3.5 and 3.8
Xcode 8
Visual Studio Community 2015
Eclipse CDT under Linux

Dependencies

an STL implementation (even an old one, like the one provided with VC6 should work)
exception support (the class Exception inherits from std::runtime_error)
the SQLite library (3.7.15 minimum from 2012-12-12) either by linking to it dynamicaly or statically (install the libsqlite3-dev package under Debian/Ubuntu/Mint Linux), or by adding its source file in your project code base (source code provided in src/sqlite3 for Windows), with the SQLITE_ENABLE_COLUMN_METADATA macro defined (see http://www.sqlite.org/compile.html#enable_column_metadata).

Getting started

Installation

To use this wrapper, you need to add the SQLiteC++ source files from the src/ directory in your project code base, and compile/link against the sqlite library.

The easiest way to do this is to add the wrapper as a library. The "CMakeLists.txt" file defining the static library is provided in the root directory, so you simply have to add_subdirectory(SQLiteCpp) to you main CMakeLists.txt and link to the "SQLiteCpp" wrapper library.

Example for Linux:

add_subdirectory(${CMAKE_CURRENT_LIST_DIR}/thirdparty/SQLiteCpp)

include_directories(
  ${CMAKE_CURRENT_LIST_DIR}/thirdparty/SQLiteCpp/include
)

add_executable(main src/main.cpp)
target_link_libraries(main
  SQLiteCpp
  sqlite3
  pthread
  dl
  )

Thus this SQLiteCpp repository can be directly used as a Git submoldule. See the SQLiteCpp_Example side repository for a standalone "from scratch" example.

Under Debian/Ubuntu/Mint Linux, you can install the libsqlite3-dev package if you don't want to use the embedded sqlite3 library.

Building example and unit-tests:

Use git to clone the repository. Then init and update submodule "googletest".

git clone https://github.com/SRombauts/SQLiteCpp.git
cd SQLiteCpp
git submodule init
git submodule update

CMake and tests

A CMake configuration file is also provided for multiplatform support and testing.

Typical generic build for MS Visual Studio under Windows (from build.bat):

mkdir build
cd build

cmake ..        # cmake .. -G "Visual Studio 10"    # for Visual Studio 2010
@REM Generate a Visual Studio solution for latest version found
cmake -DSQLITECPP_BUILD_EXAMPLES=ON -DSQLITECPP_BUILD_TESTS=ON ..

@REM Build default configuration (ie 'Debug')
cmake --build .

@REM Build and run tests
ctest --output-on-failure

Generating the Linux Makefile, building in Debug and executing the tests (from build.sh):

mkdir Debug
cd Debug

# Generate a Makefile for GCC (or Clang, depanding on CC/CXX envvar)
cmake -DSQLITECPP_BUILD_EXAMPLES=ON -DSQLITECPP_BUILD_TESTS=ON ..

# Build (ie 'make')
cmake --build .

# Build and run unit-tests (ie 'make test')
ctest --output-on-failure

CMake options

For more options on customizing the build, see the CMakeLists.txt file.

Troubleshooting

Under Linux, if you get muliple linker errors like "undefined reference to sqlite3_xxx", it's that you lack the "sqlite3" library: install the libsqlite3-dev package.

If you get a single linker error "Column.cpp: undefined reference to sqlite3_column_origin_name", it's that your "sqlite3" library was not compiled with the SQLITE_ENABLE_COLUMN_METADATA macro defined (see http://www.sqlite.org/compile.html#enable_column_metadata). You can either recompile it yourself (seek help online) or you can comment out the following line in src/Column.h:

#define SQLITE_ENABLE_COLUMN_METADATA

Continuous Integration

This project is continuously tested under Ubuntu Linux with the gcc and clang compilers using the Travis CI community service with the above CMake building and testing procedure. It is also tested in the same way under Windows Server 2012 R2 with Visual Studio 2013 compiler using the AppVeyor countinuous integration service.

Detailed results can be seen online:

Thread-safety

SQLite supports three modes of thread safety, as describe in "SQLite And Multiple Threads": see http://www.sqlite.org/threadsafe.html

This SQLiteC++ wrapper does no add any locks (no mutexes) nor any other thread-safety mechanism above the SQLite library itself, by design, for lightness and speed.

Thus, SQLiteC++ naturally supports the "Multi Thread" mode of SQLite: "In this mode, SQLite can be safely used by multiple threads provided that no single database connection is used simultaneously in two or more threads."

But SQLiteC++ does not support the fully thread-safe "Serialized" mode of SQLite, because of the way it shares the underlying SQLite precompiled statement in a custom shared pointer (See the inner class "Statement::Ptr").

Examples

The first sample demonstrates how to query a database and get results:

try
{
    // Open a database file
    SQLite::Database    db("example.db3");
    
    // Compile a SQL query, containing one parameter (index 1)
    SQLite::Statement   query(db, "SELECT * FROM test WHERE size > ?");
    
    // Bind the integer value 6 to the first parameter of the SQL query
    query.bind(1, 6);
    
    // Loop to execute the query step by step, to get rows of result
    while (query.executeStep())
    {
        // Demonstrate how to get some typed column value
        int         id      = query.getColumn(0);
        const char* value   = query.getColumn(1);
        int         size    = query.getColumn(2);
        
        std::cout << "row: " << id << ", " << value << ", " << size << std::endl;
    }
}
catch (std::exception& e)
{
    std::cout << "exception: " << e.what() << std::endl;
}

The second sample shows how to manage a transaction:

try
{
    SQLite::Database    db("transaction.db3", SQLite::OPEN_READWRITE|SQLite::OPEN_CREATE);

    db.exec("DROP TABLE IF EXISTS test");

    // Begin transaction
    SQLite::Transaction transaction(db);

    db.exec("CREATE TABLE test (id INTEGER PRIMARY KEY, value TEXT)");

    int nb = db.exec("INSERT INTO test VALUES (NULL, \"test\")");
    std::cout << "INSERT INTO test VALUES (NULL, \"test\")\", returned " << nb << std::endl;

    // Commit transaction
    transaction.commit();
}
catch (std::exception& e)
{
    std::cout << "exception: " << e.what() << std::endl;
}

How to handle assertion in SQLiteC++:

Exceptions shall not be used in destructors, so SQLiteC++ uses SQLITECPP_ASSERT() to check for errors in destructors. If you don't want assert() to be called, you have to enable and define an assert handler as shown below, and by setting the flag SQLITECPP_ENABLE_ASSERT_HANDLER when compiling the lib.

#ifdef SQLITECPP_ENABLE_ASSERT_HANDLER
namespace SQLite
{
/// definition of the assertion handler enabled when SQLITECPP_ENABLE_ASSERT_HANDLER is defined in the project (CMakeList.txt)
void assertion_failed(const char* apFile, const long apLine, const char* apFunc, const char* apExpr, const char* apMsg)
{
    // Print a message to the standard error output stream, and abort the program.
    std::cerr << apFile << ":" << apLine << ":" << " error: assertion failed (" << apExpr << ") in " << apFunc << "() with message \"" << apMsg << "\"\n";
    std::abort();
}
}
#endif

How to contribute

GitHub website

The most efficient way to help and contribute to this wrapper project is to use the tools provided by GitHub:

please fill bug reports and feature requests here: https://github.com/SRombauts/SQLiteCpp/issues
fork the repository, make some small changes and submit them with pull-request

Contact

You can also email me directly, I will try to answer questions and requests whenever I get the time for it.

Coding Style Guidelines

The source code use the CamelCase naming style variant where:

type names (class, struct, typedef, enums...) begin with a capital letter
files (.cpp/.h) are named like the class they contain
function and variable names begin with a lower case letter
member variables begin with a 'm', function arguments begin with a 'a', booleans with a 'b', pointers with a 'p'
each file, class, method and member variable is documented using Doxygen tags See also http://www.appinf.com/download/CppCodingStyleGuide.pdf for good guidelines

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