This example will demonstrate how you can write a C++ program to utilize SQLite as your program database file in Linux environment. I am using Ubuntu in this demonstration.
If you are new to C++ & SQLite in Ubuntu, it is advisable that you read the following article so that you have better understanding what to do before you can compile your c++ program and utilize SQLite in your system.
Compiling C++ code by using g++ in Ubuntu
Installing SQLite in Ubuntu
To start the demo, let’s create a cpp file now and I rename it as SqliteSample.cpp. Also, include the the following header file from sqlite to our demo program.
We now create a new callback function. The callback function is triggered once there is data ready to display. This usually happen when the select statement being executed.
In the main function, right after the database being open successfully and before it’s close, we need to insert the following codes into the main function so that our mission in this demonstration can be accomplished.
To compile this program, we will need to link the sqlite3 library along with the program as following:
If you compiled and run the C++ program now, you should see a similar screenshot as following.
![c++ example in ubuntu]( "c++ example in ubuntu")
Open the askyb.db file from Sqlite console will show you the data as following:
![c++ example in ubuntu]( "c++ example in ubuntu_pic2")
Download sample source code: SQLiteSample.cpp
#include <sqlite3.h>
1 2 3 4 5 6 7 8 9 10 11 12 | // This is the callback function to display the select data in the table static int callback(void *NotUsed, int argc, char **argv, char **szColName) { for(int i = 0; i < argc; i++) { std::cout << szColName[i] << " = " << argv[i] << std::endl; } std::cout << "\n"; return 0; } |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 | int main() { sqlite3 *db; char *szErrMsg = 0; // open database int rc = sqlite3_open("askyb.db", &db); if(rc) { std::cout << "Can't open database\n"; } else { std::cout << "Open database successfully\n"; } // prepare our sql statements const char *pSQL[6]; pSQL[0] = "CREATE TABLE Employee(Firstname varchar(30), Lastname varchar(30), Age smallint)"; pSQL[1] = "INSERT INTO Employee(Firstname, Lastname, Age) VALUES ('Woody', 'Alan', 45)"; pSQL[2] = "INSERT INTO Employee(Firstname, Lastname, Age) VALUES ('Micheal', 'Bay', 38)"; pSQL[3] = "SELECT * FROM Employee"; // execute sql for(int i = 0; i < 4; i++) { rc = sqlite3_exec(db, pSQL[i], callback, 0, &szErrMsg); if(rc != SQLITE_OK) { std::cout << "SQL Error: " << szErrMsg << std::endl; sqlite3_free(szErrMsg); break; } } // close database if(db) { sqlite3_close(db); } return 0; } |
$ g++ SqliteSample.cpp -l sqlite3 -o SqliteSample
Open the askyb.db file from Sqlite console will show you the data as following:
Download sample source code: SQLiteSample.cpp