char *sql="CREATE TABLE PhoneNote(ID integer primary key autoincrement)；
sqlite3_exec(phone_db,sql,NULL,NULL,&errmsg);
sql="INSERT INTO PhoneNote values(NULL)";//这一句用mprintf怎么赋值？
sqlite3_exec(phone_db,sql,NULL,NULL,&errmsg);

sql = sqlite3_mprintf("INSERT INTO PhoneNote VALUES(NULL)");