how to show data of database in table view - objective-c

Question

Hello I am new in sqlite database, I want to show data which I have stored in database, in second view controller by clicking (show data button) in tableview.
Below is my code for database
file DBManager.h
#interface DBManager : NSObject
{
NSString *databasePath;
}
+(DBManager*)getSharedInstance;
-(BOOL)createDB;
-(BOOL) saveData:(NSString*)registerNumber name:(NSString*)name
department:(NSString*)department year:(NSString*)year;
-(NSArray*) findByRegisterNumber:(NSString*)registerNumber;
#end
file DBManager.m
static DBManager *sharedInstance = nil;
static sqlite3 *database = nil;
static sqlite3_stmt *statement = nil;
#implementation DBManager
+(DBManager *)getSharedInstance
{
if (!sharedInstance) {
sharedInstance = [[super allocWithZone:NULL]init];
[sharedInstance createDB];
}
return sharedInstance;
}
-(BOOL)createDB
{
NSString *docsDir;
NSArray *dirPaths;
dirPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
docsDir = dirPaths[0];
NSLog(#"%#", docsDir);
databasePath = [[NSString alloc]initWithString:[docsDir stringByAppendingPathComponent:#"student.db"]];
BOOL isSuccess = YES;
NSFileManager *filemngr = [NSFileManager defaultManager];
if ([filemngr fileExistsAtPath:databasePath] == NO)
{
const char *dbpath = [databasePath UTF8String];
if (sqlite3_open(dbpath, &database) == SQLITE_OK)
{
char *errMsg;
const char * sql_stmt = "create table if not exists studentsDetail (regno integer primary key, name text, department text, year text)";
if (sqlite3_exec(database, sql_stmt, NULL, NULL, &errMsg)!= SQLITE_OK)
{
isSuccess = NO;
NSLog(#"Failed to create table");
}
sqlite3_close(database);
return isSuccess;
}
else
{
isSuccess = NO;
NSLog(#"Failed to open/create database");
}
}
return isSuccess;
}
-(BOOL)saveData:(NSString *)registerNumber name:(NSString *)name department:(NSString *)department year:(NSString *)year;
{
const char *dbpath = [databasePath UTF8String];
if (sqlite3_open(dbpath, &database) == SQLITE_OK)
{
NSString *insertSQL = [NSString stringWithFormat:#"insert into studentsDetail (regno,name,department,year) values (\"%ld\",\"%#\",\"%#\",\"%#\")",(long)[registerNumber integerValue],name,department,year];
const char *insert_stmt = [insertSQL UTF8String];
sqlite3_prepare_v2(database, insert_stmt,-1, &statement, NULL);
if (sqlite3_step(statement) == SQLITE_DONE)
{
return YES;
}
else
{
return NO;
}
//sqlite3_reset(statement);
}
return NO;
}
- (NSArray*) findByRegisterNumber:(NSString*)registerNumber
{
const char *dbpath = [databasePath UTF8String];
if (sqlite3_open(dbpath, &database) == SQLITE_OK)
{
NSString *querySQL = [NSString stringWithFormat:#"select name,department,year from studentsDetail where regno=\"%#\"",registerNumber];
const char *query_stmt = [querySQL UTF8String];
NSMutableArray *resultArray = [[NSMutableArray alloc]init];
if (sqlite3_prepare_v2(database,
query_stmt, -1, &statement, NULL) == SQLITE_OK)
{
if (sqlite3_step(statement) == SQLITE_ROW)
{
NSString *name = [[NSString alloc] initWithUTF8String:
(const char *) sqlite3_column_text(statement, 0)];
[resultArray addObject:name];
NSString *department = [[NSString alloc] initWithUTF8String:
(const char *) sqlite3_column_text(statement, 1)];
[resultArray addObject:department];
NSString *year = [[NSString alloc]initWithUTF8String:
(const char *) sqlite3_column_text(statement, 2)];
[resultArray addObject:year];
NSLog(#"%#", resultArray);
return resultArray;
}
else{
NSLog(#"Not found");
return nil;
}
//sqlite3_reset(statement);
}
}
return nil;
}
#end
Please help me..

Answer 1

Updated Code:
DBManager.m
-(NSArray *) showdata{
const char *dbpath = [databasePath UTF8String];
if (sqlite3_open(dbpath, &database) == SQLITE_OK)
{
NSString *querySQL = [NSString stringWithFormat: #"SELECT * FROM studentsDetail"];
const char *query_stmt = [querySQL UTF8String];
NSMutableArray *resultentArray=[[NSMutableArray alloc]init];
if (sqlite3_prepare_v2(database,
query_stmt, -1, &statement, NULL) == SQLITE_OK)
{
while(sqlite3_step(statement) == SQLITE_ROW)
{
NSMutableDictionary *resultentDict = [[NSMutableDictionary alloc] init];
NSString *name = [[NSString alloc] initWithUTF8String:
(const char *) sqlite3_column_text(statement, 0)];
NSString * department = [[NSString alloc] initWithUTF8String:
(const char *) sqlite3_column_text(statement, 1)];
NSString *year = [[NSString alloc] initWithUTF8String:
(const char *) sqlite3_column_text(statement, 2)];
NSLog(#"%#",resultentDict);
[resultentDict setValue:name forKey:#"name"];
[resultentDict setValue:department forKey:#"department"];
[resultentDict setValue:year forKey:#"year"];
NSLog(#"%#",resultentDict);
NSLog(#"%#",resultentArray);
[resultentArray addObject:resultentDict];
NSLog(#"%#",resultentArray);
}
return resultentArray;
}
sqlite3_close(database);
}
return nil;
}
after that I created one button called show data ... if I click that it will navigate to another TableViewController:
I implemented like this :
in TableViewController:
- (void)viewDidLoad {
[self showData];
}
-(void)showData{
data = [[DBManager getSharedInstance]showdata];
NSLog(#"DATA %#",data);
NSLog(#"%lu",(unsigned long)[[data valueForKey:#"price"] count]);
}
#pragma mark - Table view data source
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
return [[data valueForKey:#"price"] count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *simpleTableIdentifier = #"SimpleTableItem";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:simpleTableIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:simpleTableIdentifier];
}
NSLog(#"%#",data);
// cell.textLabel.text = [[data valueForKey:#"year"]objectForKey:indexPath.row];
cell.textLabel.text=[[data valueForKey:#"price"]objectAtIndex:indexPath.row];
return cell;
}