SQLite – How to use fundamental functions in C++

SQLite operations in C++

This tutorial aimed to demonstrate how to use SQLite database operations such as CREATE, INSERT, UPDATE, SELECT and DELETE in C++. Since the appearance first smartphone and other mobile devices SQLite become most widely deployed and used database engine in the world. Precise numbers are difficult to obtain but SQLite is likely used more than all other database engines combined. We can find SQLite in every Android device, iPhone and iOS device, Mac, Windows10, Firefox, Chrome, Safari, Skype, Dropbox, TurboTax, QuickBooks, PHP, Python, television sets, set-top cable boxes and many automotive multimedia systems.

It’s an open-source SQL database engine. You can download the source code or precompiled binaries depending your requirements. You might also need to add [-lsqlite3] and [-std=c++17] to successfully compile, create an executable file. Each of the following source code available on my git repository. https://github.com/lnrsoft

Step 1 – The first thing we need to do is to create the actual database file that we will use in this article. I called sqltdemo.db in our case.

Compile and run our source code to create the sqltdemo.db with the following command. Here we link our code with the sqlite3 library that will create our db file.

Verify our result:


Compile and run.


Compile and run.

Step 4 – Fetch and display records from the company CANDIDATE TABLE. In this scenario we use a callback function that obtains results from SELECT statement.

Compile and run.

Step 5 – Using UPDATE statement to update any records in our CANDIDATE table.

Compile and run.

Step 6 – DELETE statement can delete any records from the CANDIDATE table.

Compile and run.

I recommend you to check the official SQLite documentation at sqlite.org for more advance SQLite features and options and support. For further info about using sql with c++ you might found it useful to read me previous post of  a simple Qt tool to test QSqlDatabase access connection to a MySQL database. I created this simple Qt command line tool to test connection between Qt client applications and a remote Mysql Server. The code includes Secure Sockets Layer (SSL) support to test secure connection. The QSqlDatabase class provides an interface for accessing a database through a connection where an instance of QSqlDatabase represents the connection. The connection provides access to the database via one of the supported database drivers, which are derived from QSqlDriver.

Alternatively, we can subclass your own database driver from QSqlDriver. My next post will be an article how to write your own database driver in Qt for Unix, OSX and Windows platforms.

[C++] Helgrind – the thread error detector

Helgrind is a Valgrind tool for detecting synchronisation errors in C, C++ and Fortran programs that use the POSIX pthreads threading primitives. To use this tool, you must specify --tool=helgrind on the Valgrind command line.

[C++] MemorySanitizer

MemorySanitizer is a detector of uninitialized memory reads in C/C++ programs. Uninitialized values occur when stack- or heap-allocated memory is read before it is written. MSan detects cases where such values affect program execution.
At this time, MemorySanitizer supports Linux x86_64 only.
To use MemorySanitizer, compile and link your program with -fsanitize=memory -fPIE -pie. To get any stack traces, add -fno-omit-frame-pointer.

Origins tracking

[C++] AddressSanitizer

AddressSanitizer is a memory error detector for C/C++. It finds:

-Use after free (dangling pointer dereference)
-Heap buffer overflow
-Stack buffer overflow
-Global buffer overflow
-Use after return
-Use after scope
-Initialization order bugs
-Memory leaks

In order to use AddressSanitizer we will need to compile and link your program using clang with the -fsanitize=address switch. To get a reasonable performance add -O1 or higher.