iOS - Searching a SQLite database is slow - ios

Question

Hi I have built a dictionary application my data base has 78.000 record , so when I trying to search through data base the searching process is not smooth and you feel some delay ! specially when try to type first letter when app lunched . here is my codes , I would be grateful if help me to find a solution :
Searching :
- (void)searchWord:(NSString *)txt{
sqlite3_exec(database, "REINDEX table;", NULL, NULL, NULL);
NSMutableArray *DB_Array = [[NSMutableArray alloc] init];
NSString *dbPath = [[NSString alloc] initWithString: [self getDBPath]];
if (sqlite3_open([dbPath UTF8String], &database) == SQLITE_OK) {
// #"SELECT * FROM DIC WHERE NAME != '%#%%' ORDER BY NAME LIMIT 30"
// SELECT * FROM DIC Where Name LIKE '%#%%' order by NAME LIMIT 30
NSString *sql =[NSString stringWithFormat:#"SELECT ID,NAME FROM DIC WHERE NAME LIKE '%#%%' ORDER BY NAME LIMIT 15",txt];
sqlite3_stmt *compiledStatement;
if(sqlite3_prepare_v2(database, [sql UTF8String] , -1, &compiledStatement, NULL) == SQLITE_OK) {
while(sqlite3_step(compiledStatement) == SQLITE_ROW) {
NSInteger oid = sqlite3_column_int(compiledStatement, 0);
const char* f1 = (const char*)sqlite3_column_text(compiledStatement, 1);
NSString *oName = f1 == NULL ? nil : [[NSString alloc] initWithUTF8String:f1];
// NSLog(#"%#",oName);
const char* f2 = (const char*)sqlite3_column_text(compiledStatement, 2);
NSString *oMean = f2 == NULL ? nil : [[NSString alloc] initWithUTF8String:f2];
const char* f3 = (const char*)sqlite3_column_text(compiledStatement, 3);
NSString *oPron = f3 == NULL ? nil : [[NSString alloc] initWithUTF8String:f3];
NSInteger bm = sqlite3_column_int(compiledStatement, 5);
readerClass = [[Reader alloc]initWithReadDB:oid Name:oName Mean:oMean Pron:oPron bookMark:bm];
[DB_Array addObject:readerClass];
}
}
else {
NSLog(#"Error retrieving data from database.");
}
sqlite3_close(database);
}
else {
NSLog(#"Error: Can't open database!");
NSLog(#" DB Name %#",viewController.dbName);
}
AppDelegate *appDelegateClass = (AppDelegate *)[[UIApplication sharedApplication] delegate];
[appDelegateClass.wordList removeAllObjects];
[appDelegateClass.wordList=DB_Array mutableCopy];
[appDelegateClass setCurrentDBPath:[dbPath UTF8String]];
}
TableView :
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
appClass = (AppDelegate *)[[UIApplication sharedApplication] delegate];
NSLog(#"%d",appClass.wordList.count);
return appClass.wordList.count;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
appClass = (AppDelegate *)[[UIApplication sharedApplication] delegate];
readerClass = (Reader *)[appClass.wordList objectAtIndex:indexPath.row];
cell.textLabel.text = readerClass.Name;
return cell;
}
SearchBar :
- (void)searchBar:(UISearchBar *)theSearchBar textDidChange:(NSString *)searchText {
if([searchText length] > 0) {
dbClass=[[DB alloc]init];
[dbClass searchWord:searchText];
}else
{
dbClass=[[DB alloc]init];
[dbClass searchWord:#" "];
}
[self.myTable reloadData];
}