api to store image to sql

void SqlDb::insert_image(string img_id, string img_path)
{
    //write your code here
    int n = img_path.length();
    char path[n+1];
    strcpy(path, img_path.c_str());
    Mat img = imread(path, 1);
    stringstream ss(stringstream::in | stringstream::out);
    ss << img_id;
    string mystr = ss.str();
    string query = "INSERT INTO images (id, img) VALUES (" + mystr + ", decode('" + img_path + "', 'base64'));";
    const char* q = query.c_str();
    //cout << q << endl;
    execute(q);
}