sqlite3 won't work second time - c++

Question

My Sqlite connector works just fine the first time I try to insert rows, but after it is closed and I run the program again it won't work at all.
Here is my constructor
Sqldatabase::Sqldatabase() {
open_connection("Database.db");
sqlite3_stmt *statement;
std::string sql = "SELECT id FROM articles ORDER BY id DESC LIMIT 1";
char *query = &sql[0];
if(sqlite3_prepare_v2(db, query, -1, &statement, 0) == SQLITE_OK && sqlite3_step(statement) == SQLITE_ROW) {
article_counter = sqlite3_column_int(statement, 0) + 1;
} else {
article_counter = 1;
}
}
Here is my preparedStatement method.
bool Sqldatabase::prepareStatement(std::string sql) {
char *query = &sql[0];
sqlite3_stmt *statement;
int result;
if (sqlite3_prepare_v2(db, query, sql.size(), &statement, 0) == SQLITE_OK) {
result = sqlite3_step(statement);
std::cout << sql << '\n';
sqlite3_finalize(statement);
if(result == SQLITE_DONE) {
return true;
}
}
std::cout << "SQL failed: " << sql << '\n';
return false;
}
And finally here is where I call the method.
bool Sqldatabase::create_ART(int ng_id, std::string title, std::string author, std::string text) {
//Creating article
std::ostringstream s;
s << "INSERT INTO articles (id, title, author, content, created) " <<
"VALUES (" << article_counter << ", '" << title << "', '" << author << "', '" << text << "' , CURRENT_DATE)";
std::string sql(s.str());
prepareStatement(sql);
//Adding article to newsgroup
std::ostringstream t;
t << "INSERT INTO contains VALUES ( " << article_counter << " , " << ng_id << ")";
std::string sql2(t.str());
article_counter++;
return prepareStatement(sql2);
}
My test script looks like this. And I already have a Newsgroup with id 1 in the database.
Sqldatabase db;
int main(int argc, char* argv[]){
std::cout << "-----Test of Memdatabase, Newsgroup and Article classes-----" << std::endl;
db = Sqldatabase();
db.create_ART(1, "Happy day", "John", "Sunday afternoon is pretty chill");
db.create_ART(1, "Chill day", "Peter", "Sunday afternoon is pretty chill");
}

Answer 1

Ah, you're trying to create a new record with the same id. ids are typically unique. try:
db.create_ART(2, "Chill day", "Peter", "Sunday afternoon is pretty chill");