.h file

#import <sqlite3.h>

@interface RootViewController : UIViewController {

    IBOutlet UIView *page1;
    IBOutlet UIButton *b2;
        IBOutlet UITextField *textid;
    IBOutlet UITextField *textname;

    IBOutlet UILabel *status;
    NSString *databasePath;
    NSMutableArray *temparray;
    //NSMutableDictionary *item;
    //IBOutlet UIButton *btnNextview;

    NSString *databaseName;
    BOOL isInSwipeDeleteMode;

}

@property (assign) BOOL isInSwipeDeleteMode;

-(void)checkAndCreateDatabase;
-(void)getdata;
-(IBAction)savedata;
-(BOOL)UpdateData;
-(IBAction)find:(id)sender;
-(IBAction)keyhide:(id)sender;
-(IBAction)btnTapped:(id)sender;
- (BOOL) validateEmail: (NSString *) candidate;
-(void)delData:(NSString *)path;

@end

.m file

-(void) checkAndCreateDatabase {

    BOOL success;   
    databaseName = @"namedatabase.rdb";
    NSArray *documentPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDir = [documentPaths objectAtIndex:0];
    databasePath = [documentsDir stringByAppendingPathComponent:databaseName];

    NSFileManager *fileManager = [NSFileManager defaultManager];

    success = [fileManager fileExistsAtPath:databasePath];

    if(success) return;


    NSString *databasePathFromApp = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:databaseName];

    [fileManager copyItemAtPath:databasePathFromApp toPath:databasePath error:nil];

    [fileManager release];
}

-(IBAction)save_DB
{
    [self checkAndCreateDatabase];
    //[self RemoveData];
    sqlite3 *database;
    static sqlite3_stmt * addStmt ;
    NSFileManager *fileManager = [NSFileManager defaultManager];
    NSError *error;
    databaseName = @"Photos_db.rdb";
    NSArray *documentPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDir = [documentPaths objectAtIndex:0];
    databasePath = [documentsDir stringByAppendingPathComponent:databaseName];

    BOOL success = [fileManager fileExistsAtPath:databasePath];
    if(!success)
    {
        NSString *defaultDBPath = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"Photos_db.rdb"];
        success = [fileManager copyItemAtPath:defaultDBPath toPath:databasePath error:&error];
        if (!success)
            NSAssert1(0, @"Failed to create writable database file with message '%@'.", [error localizedDescription]);
    }   

    if (sqlite3_open([databasePath UTF8String], &database) == SQLITE_OK)
    {
        const char *sql = "insert into photo_table(photo_name,photo_date) Values(?,?)";
        if(sqlite3_prepare_v2(database, sql, -1, &addStmt, NULL) != SQLITE_OK)
            NSAssert1(0, @"Error while creating add statement. '%s'", sqlite3_errmsg(database));
        sqlite3_bind_text(addStmt, 1, [text_photoname.text UTF8String], -1, SQLITE_TRANSIENT);
        sqlite3_bind_text(addStmt, 2, [text_photodate.text UTF8String], -1, SQLITE_TRANSIENT);
        //sqlite3_bind_text(addStmt, 3, [txtplaceDetail.text UTF8String], -1, SQLITE_TRANSIENT);

        if (sqlite3_step(addStmt) == SQLITE_DONE)
        {
            //status.text = @"Contact added";
            //text_photoname.text = @"";
            //text_photodate.text= @"";
            //photo_img.hidden=YES;
        }
        //phone.text = @"";
        //if(SQLITE_DONE != sqlite3_step(addStmt))

        //    NSAssert1(0, @"Error while inserting data. '%s'", sqlite3_errmsg(database));
        else
            sqlite3_reset(addStmt);

    }
    else
    {

    }


    sqlite3_close(database);
    [self getdata];
}

-(void)getdata
{
    [self checkAndCreateDatabase];
    sqlite3 *database;

    temparray = [[NSMutableArray alloc] init];

    if(sqlite3_open([databasePath UTF8String], &database) == SQLITE_OK) {

        NSString *sql = [NSString stringWithFormat:@"select * from newtable"];
        const char *sqlStatement = [sql UTF8String];

         sqlite3_stmt *compiledStatement;
        if(sqlite3_prepare_v2(database, sqlStatement, -1, &compiledStatement, NULL) == SQLITE_OK) {
            while(sqlite3_step(compiledStatement) == SQLITE_ROW) {
                NSMutableDictionary *item=[[NSMutableDictionary alloc] init];
                //NSMutableArray *item=[[NSMutableArray alloc] init];

                [item setObject:[NSString stringWithUTF8String:(char *)sqlite3_column_text(compiledStatement, 1)] forKey:@"eid"];
                [item setObject:[NSString stringWithUTF8String:(char *)sqlite3_column_text(compiledStatement, 2)] forKey:@"ename"];

                [temparray addObject:item];

            }
        }
        sqlite3_finalize(compiledStatement);

    }
    sqlite3_close(database);
    NSLog(@"%@",temparray);
    //NSLog(@"%@",item);
}
-(void)RemoveData
{   
    sqlite3 *database;
    sqlite3_stmt *deleteStmt=nil ;
    [self checkAndCreateDatabase];
    if(sqlite3_open([databasePath UTF8String], &database) == SQLITE_OK) {
        if(deleteStmt == nil) {
            const char *sql = "delete from newtable where eid = ?";
            if(sqlite3_prepare_v2(database, sql, -1, &deleteStmt, NULL) != SQLITE_OK)
                NSAssert1(0, @"Error while creating delete statement. '%s'", sqlite3_errmsg(database));
        }

        //When binding parameters, index starts from 1 and not zero.
        const char* the = [delString UTF8String];
        sqlite3_bind_text(deleteStmt, 1, the, -1, SQLITE_TRANSIENT);

        if (SQLITE_DONE != sqlite3_step(deleteStmt))
            NSAssert1(0, @"Error while deleting. '%s'", sqlite3_errmsg(database));

        sqlite3_reset(deleteStmt);
    }
    sqlite3_close(database);


}
-(void)UpdateData
{
    [self checkAndCreateDatabase];
    //sqlite3 *db = [appDelegate database];
    sqlite3_stmt *update_statement;
    sqlite3 *db;


    NSString *sqlStr = [NSString stringWithFormat:@"UPDATE newtable SET ename=\"%@\" WHERE eid=\"%@\" ",txtname.text,txtid.text];
//    NSString *sqlStr = [NSString stringWithFormat:@"UPDATE newtable SET ename=? WHERE eid=?"];
    //const char *sql = "update Coffee Set CoffeeName = ?, Price = ? Where CoffeeID = ?";

//if(sqlite3_prepare_v2(database, sqlStatement, -1, &compiledStatement, NULL) == SQLITE_OK)

    const char *sql = [sqlStr UTF8String];
    if(sqlite3_open([databasePath UTF8String],&db)==SQLITE_OK){

    if (sqlite3_prepare_v2(db, sql, -1, &update_statement, NULL) == SQLITE_OK) {
            //UIAlertView *alert = [[UIAlertView alloc] initWithTitle:NSLocalizedString(@"DatabaseNotAvailable", @"") message:[NSString stringWithUTF8String:sqlite3_errmsg(db)]delegate:self cancelButtonTitle:@"OK" otherButtonTitles: nil];
//            [alert show];   
//            [alert release];
        //return NO;
        //txtid.text=@"";
        //txtname.text=@"";
        statusm.text=@"updated";
    }

    int success = sqlite3_step(update_statement);
    if (success == SQLITE_ERROR) {
        NSAssert1(0, @"Error: failed to insert into the database with message '%s'.", sqlite3_errmsg(db));
        //return NO;
    }

    sqlite3_finalize(update_statement);
    }    //return YES;

}

- (BOOL) validateEmail: (NSString *) candidate {
    NSString *emailRegex = @"[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}";
    NSPredicate *emailTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", emailRegex];
    //  return 0;
    return [emailTest evaluateWithObject:candidate];
}

-(IBAction)btnTapped:(id)sender{

    if([self validateEmail:textid.text]==1)
    {
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Message" message:@"You Enter Correct Email id." delegate:self cancelButtonTitle:nil otherButtonTitles:@"OK", nil];
        [alert show];
        [alert release];

        [self savedata];
    }
    else {
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Message" message:@"You Enter Incoorect Email id." delegate:self cancelButtonTitle:nil otherButtonTitles:@"OK", nil];
        [alert show];
        [alert release];
    }
}