iPhone: Sqlite update or insert row - iphone

Question

I want to update the quantity if the menuid is already available otherwise add a new row.
I used the following code.But no row is added or updated.
sqlite3 *database;
sqlite3_stmt *addStmt=nil;
if (selection== nil) {
selection =#"Medium";
}
if (sqlite3_open([dbPath UTF8String], &database) == SQLITE_OK) {
const char *select="select quantity from item where menuid = ?";
sqlite3_stmt *selectstmt;
if(sqlite3_prepare_v2(database, select, -1, &selectstmt, NULL) == SQLITE_OK) {
while(sqlite3_step(selectstmt) == SQLITE_ROW) {
menuID= [NSString stringWithUTF8String:(char *)sqlite3_column_text(selectstmt, 0)];
char *quant = (char *)sqlite3_column_text(selectstmt,1);
quantity=[NSString stringWithUTF8String:(char *)quant];
// [self.ids addObject:menuID];
}
sqlite3_reset(selectstmt);
}
NSString *quant=[NSString stringWithFormat:#"%#",quantity];
if (quant == #"") {
if (addStmt == nil) {
// const char *sql = "delete from item";
const char *sql = "insert into item(menuid,itemName,price,quantity,spiciness) Values( ?, ?, ?, ?,?)";
if(sqlite3_prepare_v2(database, sql, -1, &addStmt, NULL) != SQLITE_OK)
NSAssert1(0, #"Error while creating add statement. '%s'", sqlite3_errmsg(database));
}
// NSLog(#"ADDSTMT:%#",addStmt);
sqlite3_bind_int(addStmt, 1, [itemId integerValue]);
sqlite3_bind_text(addStmt, 2, [name UTF8String], -1, SQLITE_TRANSIENT);
sqlite3_bind_double(addStmt, 3, [priceItem doubleValue] );
sqlite3_bind_int(addStmt, 4, number);
sqlite3_bind_text(addStmt, 5, [selection UTF8String],-1,SQLITE_TRANSIENT);
NSLog(#"Name:%#",name);
NSLog(#"MENU IDe%#",priceItem);
if(SQLITE_DONE != sqlite3_step(addStmt)){
// NSAssert1(0, #"Error while inserting data. '%s'", sqlite3_errmsg(database));
}
else
//SQLite provides a method to get the last primary key inserted by using sqlite3_last_insert_rowid
menuID = [NSDecimalNumber numberWithLongLong:sqlite3_last_insert_rowid(database)];
//Reset the add statement.
sqlite3_reset(addStmt);
}
else{
if (addStmt == nil) {
// const char *sql = "delete from item";
const char *sql = "update item set quantity= ? where menuid = ?";
if(sqlite3_prepare_v2(database, sql, -1, &addStmt, NULL) != SQLITE_OK)
NSAssert1(0, #"Error while creating add statement. '%s'", sqlite3_errmsg(database));
}
// NSLog(#"ADDSTMT:%#",addStmt);
sqlite3_bind_int(addStmt, 2, [itemId integerValue]);
number=number+[quant intValue];
sqlite3_bind_int(addStmt, 1, number);
NSLog(#"Name:%#",name);
NSLog(#"MENU IDe%#",priceItem);
if(SQLITE_DONE != sqlite3_step(addStmt)){
// NSAssert1(0, #"Error while inserting data. '%s'", sqlite3_errmsg(database));
}
else
//SQLite provides a method to get the last primary key inserted by using sqlite3_last_insert_rowid
menuID = [NSDecimalNumber numberWithLongLong:sqlite3_last_insert_rowid(database)];
//Reset the add statement.
sqlite3_reset(addStmt);
sqlite3_close(database);
}
}

Answer 1

I might be just lacking proper understanding of your code but it doesn't look like you're beginning and then committing a transaction in there. I might be way off base though as I've never inserted a row without using a transaction.

Answer 2

I found it my self:
Changed select statement to:
NSString *sqlStmt=[NSString stringWithFormat:#"select quantity from item where menuid = %# and spiciness = '%#'",itemId,selection];
Also changed the if Condition of insert statement to
if ([quanty isEqualToString:#"(null)"])