retrieve all data of nsarray - iphone

Question

I'm using JSON parsing to get data from MySql by using php
I got all data I want, But when I want to print this data I created a for loop but It gives me the last element only .. this is my code
in DidViewLoad:
- (void)viewDidLoad
{
[super viewDidLoad];
NSString *phpUrl = #"http://dt-works.com/eman/bookOwn.php";
NSString *dbName = #"dbName";
NSString *localHost = #"localhost";
NSString *dbUser = #"dbUser";
NSString *dbPwd = #"dbPwd";
int u_id = 1;
NSString *user_id = [NSString stringWithFormat:#"%d",u_id];
SBJsonParser *parser = [[SBJsonParser alloc] init];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:phpUrl]];
[request setHTTPMethod:#"POST"];
NSString *post = [[NSString alloc] initWithFormat:#"dbName=%#&localHost=%#&dbUser=%#&dbPwd=%#&user_id=%#&submit=", dbName, localHost, dbUser, dbPwd, user_id];
[request setHTTPBody:[post dataUsingEncoding:NSUTF8StringEncoding]];
NSData *response = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];
NSString *json_string = [[NSString alloc] initWithData:response encoding:NSUTF8StringEncoding];
NSArray *statuses = [parser objectWithString:json_string error:nil];
int arraySize = [statuses count];
for (NSDictionary *status in statuses)
{
bo_id2 = [status objectForKey:#"bo_id"];
bo_name2 = [status objectForKey:#"bo_name"];
bo_au_id2 = [status objectForKey:#"bo_au_id"];
bo_pub_id2 = [status objectForKey:#"bo_pub_id"];
bo_num_pages2 = [status objectForKey:#"bo_num_pages"];
bo_publish_year2 = [status objectForKey:#"bo_publish_year"];
}
NSLog(#"size of array is: %d", arraySize);
for (int i=0; i<arraySize; i++) {
NSLog(#"%d:",i);
// here I want to retrieve all array elements .. when I try
NSLog(#"Book id: %# - book name: %#", bookId, bookName);
// this give me the last elemet only not all data
// I want to get the data here to use it later .. how ???
}
}
any help ??

Answer 1

You appear to just be reassigning the values of each object to an instance variable, an instance variable only points to one object, not all the ones you assign it to.

Answer 2

Most probably you must have been reintializing the array some where. Check that in the entire code.

Answer 3

NSLog(#"Book id: %# - book name: %#", bookId, bookName);
How do you get the bookId and bookName values in the NSLog above? Something missing in your code there.
You can try this :
for(NSDictionary *status in statuses) {
NSLog(#"Book id: %# - Book Name: %#", [status objectForKey:#"bo_id"], [status objectForKey: #"bo_name"]);
}
In other terms, if you want to use a second for loop, go the same way as the first one.

Answer 4

I don't quite understand why you have to use two for loop to finish the task, in your first loop
NSMutableArray *books = [[NSMutableArray alloc] init];
for(NSDictionary *status in statuses){
[books addObject:status];
}
Later when you want to retrieve any books, you can just call [books objectAtIndex:index].
Hopefully this can help.
You should be able to finish all the tasks you asked for.
Edit
If you just want just one element, bo_name for example you can use:
NSMutableArray *books =[[NSMutableArray alloc] init];
for(NSDictionary *status in statuses){
[books addObject:[status objectForKey:#"bo_name"]];
}