SQLite and UITableView: Crash after numberOfRowsInSection - ios

Question

First I would like to make clear that I do not want to use Core Data in this case.
My Problem: whenever my tableview's delegate methodd: numberOfRowsInSection is called, the application crashes with nothing more than an (lldb) error message.
First I have two classes which helps me retrieve rows from my SQLite database.
sqlite.m:
#import "sqlite.h"
#import <sqlite3.h>
#implementation sqlite
#synthesize carbohydrates = _carbohydrates;
#synthesize name = _name;
#synthesize fat = _fat;
#synthesize kcal = _kcal;
- (id)initWithName:(NSString *)name2 carbs:(NSNumber *)carbs2
fat:(NSNumber *)fat2 kcal:(NSNumber*)kcal2 {
if ((self = [super init])) {
self.carbohydrates = carbs2;
self.name = name2;
self.fat = fat2;
self.kcal = kcal2;
}
return self;
}
- (void) dealloc {
self.name = nil;
self.kcal = nil;
self.fat = nil;
self.carbohydrates = nil;
[super dealloc];
}
#end
NutritionsDB.m:
#import "NutritionsDB.h"
#import "sqlite.h"
#implementation NutritionsDB
static NutritionsDB *_database;
+ (NutritionsDB*)database {
if (_database == nil) {
_database = [[NutritionsDB alloc] init];
}
return _database;
}
- (id)init {
if ((self = [super init])) {
NSString *sqLiteDb = [[NSBundle mainBundle] pathForResource:#"Livsmedeldatabas"
ofType:#"sqlite"];
if (sqlite3_open([sqLiteDb UTF8String], &_database) != SQLITE_OK) {
NSLog(#"Failed to open database!");
}
}
return self;
}
- (void)dealloc {
sqlite3_close(_database);
[super dealloc];
}
-(void)setUpDB{
const char *sql_stmt = "CREATE INDEX IF NOT EXISTS name_index on livsmedel(namn)";
char *errMsg;
if (sqlite3_exec(_database, sql_stmt, NULL, NULL, &errMsg) == SQLITE_OK)
{
puts("Index successfully created");
// SQL statement execution succeeded
}
}
-(NSArray*)sqliteInfo:(NSString*)predicateString{
NSMutableArray *retval = [[[NSMutableArray alloc] init] autorelease];
sqlite3_stmt *statement;
if (sqlite3_prepare_v2(_database, [predicateString cStringUsingEncoding:NSUTF8StringEncoding], -1, &statement, nil)
== SQLITE_OK) {
while (sqlite3_step(statement) == SQLITE_ROW) {
char *nameChars = (char *) sqlite3_column_text(statement, 0);
char *kcalchars = (char *) sqlite3_column_text(statement, 1);
char *fatchars = (char *) sqlite3_column_text(statement, 2);
char *carbchars = (char *) sqlite3_column_text(statement, 3);
NSLog(#"\n%s, \n%s, \n%s", kcalchars, fatchars, carbchars);
NSString *name = [[NSString alloc] initWithUTF8String:nameChars];
NSString *kcal = [NSString stringWithFormat:#"%s", kcalchars];
NSString *fat = [NSString stringWithFormat:#"%s", fatchars];
NSString *carb = [NSString stringWithFormat:#"%s", carbchars];
NSNumberFormatter * f = [[NSNumberFormatter alloc] init];
[f setNumberStyle:NSNumberFormatterDecimalStyle];
NSNumber * kcalNumber = [f numberFromString:kcal];
NSNumber * fatNumber = [f numberFromString:fat];
NSNumber * carbNumber = [f numberFromString:carb];
NSLog(#"\n kcalnum : %#, \n fatnum: %#, \n carbnum : %#", kcalNumber, fatNumber, carbNumber);
[f release];
sqlite *info = [[sqlite alloc] initWithName:name carbs:carbNumber fat:fatNumber kcal:kcalNumber] ;
NSLog(#"%#,%#,%#,%#", name, kcal, fat, carb);
[retval addObject:info];
[name release];
[kcal release];
[fat release];
[carb release];
}
sqlite3_finalize(statement);
}
return retval;
}
#end
Now, In one of my viewcontrollers, I continuously make database calls via the method
-(NSArray*)sqliteInfo:(NSString*)predicateString.
predicateString is a copy of a text which the user enters in a search bar inside the VC.
In addition to the UISearchBar, the VC also holds a UITableView to represent the rows fetched from the databse.
Here is how I update the datasource contents and re-render the the table view.
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
return self.nutritionList.count;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
NSLog(#"hej");
static NSString *CellIdentifier = #"NutritionIdentifier";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier] autorelease];
}
cell.textLabel.font = [UIFont fontWithName:#"Avenir-Medium" size:18.0];
cell.textLabel.text = [(sqlite*)[self.nutritionList objectAtIndex:indexPath.row] name];
return cell;
}
-(void)searchBar:(UISearchBar *)searchBar textDidChange:(NSString *)searchText{
[self.nutritionList removeAllObjects];
if (searchText.length < 2) {
;
} else {
NSString *firstChar = [searchText substringWithRange:NSMakeRange(0, 1)];
if([firstChar isEqualToString:#"å"] ||
[firstChar isEqualToString:#"Å"] ||
[firstChar isEqualToString:#"ä"] ||
[firstChar isEqualToString:#"Ä"] ||
[firstChar isEqualToString:#"ö"] ||
[firstChar isEqualToString:#"Ö"]){
NSString *lowerString = [firstChar lowercaseString];
NSString *upperString = [firstChar uppercaseString];
NSString *newSearchText = [searchText stringByReplacingCharactersInRange:NSMakeRange(0, 1) withString:lowerString];
NSString *newSearchText_upper = [searchText stringByReplacingCharactersInRange:NSMakeRange(0, 1) withString:upperString];
NSString *formatString = [[[[[#"'"stringByAppendingString:newSearchText]stringByAppendingString:#"%'"]
stringByAppendingString:#" OR namn like'"]stringByAppendingString:newSearchText_upper]stringByAppendingString:#"%' ORDER BY namn COLLATE NOCASE"];
NSArray *array = [[NutritionsDB database] sqliteInfo:[NSString stringWithFormat:#"Select * from livsmedel where namn like %#", formatString ]];
NSLog(#"%#",[NSString stringWithFormat:#"Select * from livsmedel where namn like %#", formatString ] );
for (sqlite *info in array) {
[self.nutritionList addObject:info];
}
}else{
NSString *formatString = [[#"'"stringByAppendingString:searchText]stringByAppendingString:#"%' "];
NSArray *array = [[NutritionsDB database] sqliteInfo:[NSString stringWithFormat:#"SELECT * FROM livsmedel WHERE namn LIKE %#", formatString ]];
NSLog(#"%#",[NSString stringWithFormat:#"Select * from livsmedel where namn like %#", formatString ] );
for (sqlite *info in array) {
[self.nutritionList addObject:info];
NSLog(#"carbs %#, fat %#, kcal %#", info.carbohydrates, info.fat, info.kcal);
}
}
}
[self.tableView reloadData];
}
Finally the crash occurs after the numberOfRowsInSection method is called, but before the cellForRowAtIndexPath is called. Somewhere between them.
The console says (lldb), nothing else. The view below is the assembly instructions that indicates where the crash occurs. However, I do not now how to interpret them.
My question: Why does this crash occur?
Thanks for your help.