comparing the results with user input - sqlite3 c++ - c++

Question

I have a table(Item) with attribute of id,item
id|itemName
1|noodle
2|burger
Basically I would like to ask is there anyway that I can compare a input results against my database
record?
e.g if I input noodle and there's is a matching record "noodle" in my in my database it will return found;
#include <stdio.h>
#include <stdlib.h>
#include <sqlite3.h>
#include <string>
#include <iostream>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
static int callback(void *NotUsed, int argc, char **argv, char **azColName){
int i;
for(i=0; i<argc; i++){
printf("%s = %s\n", azColName[i], argv[i] ? argv[i] : "NULL");
}
printf("\n");
return 0;
}
int main(int argc, char* argv[])
{
sqlite3 *db;
char *zErrMsg = 0;
int rc;
const char *sql;
std::string itemName;
rc = sqlite3_open("test.db", &db);
if( rc ) {
// failed
fprintf(stderr, "Can't open database: %s\n",
sqlite3_errmsg(db));
}
else
{
// success
fprintf(stderr, "Open database successfully\n");
}
std::cout << "Enter a Item" << std::endl;
std::cin >> itemName;
sql = "select * from Item";
rc = sqlite3_exec(db,sql, callback, 0, &zErrMsg);
if(//how do I compare the itemName from my database against the user input)
{
}
sqlite3_close(db);
return 0;
}

Answer 1

Instead of a callback you can use a parameter to specify just the record you need:
std::cin >> itemName;
sql = "select id from Item where itemName = ?";
sqlite3_stmt *stmt;
sqlite3_prepare_v2(db, sql, -1, &stmt, NULL);
// set the ? parameter to the itemname you are looking for:
sqlite3_bind_text(stmt, 1, itemName.c_str(), -1, SQLITE_TRANSIENT);
if(sqlite3_step(stmt) == SQLITE_ROW )
{
int id=sqlite3_column_int(stmt,0);
std::cout << "Found id=" << id << std::endl;
}
sqlite3_finalize(stmt);
sqlite3_close(db);