当我从tableView中选择一行时，从sqlite加载数据，以便能够更改某个字段的值。 通过两个视图操作，第一个视图将整个数据库加载到一个可变数组中，当我按某个字段时，我转到另一个视图。在第二个视图中，我有一个按钮。如何获得按下此按钮时数据库中字段的结果将改变值。
TableviewController称为AuthorVC.m
#import "AuthorVC.h"
#import "Author.h"
#import <sqlite3.h>
#import "SearchVC.h"
//#import "DetailViewController.h"
#import "Details.h"
@implementation AuthorVC
@synthesize theauthors;
@synthesize author;
NSString *authorNAme;
NSString *authorNAme2;
- (id)initWithStyle:(UITableViewStyle)style
{
self = [super initWithStyle:style];
if (self) {
// Custom initialization
}
return self;
}
- (void)didReceiveMemoryWarning
{
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];
// Release any cached data, images, etc that aren't in use.
}
#pragma mark - View lifecycle
- (void)viewDidLoad
{ searchBar.delegate = (id)self;
[self authorList];
[super viewDidLoad];
}
- (void)viewDidUnload
{
[searchBar release];
searchBar = nil;
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
}
- (void)viewDidAppear:(BOOL)animated
{
[super viewDidAppear:animated];
}
- (void)viewWillDisappear:(BOOL)animated
{
[super viewWillDisappear:animated];
}
- (void)viewDidDisappear:(BOOL)animated
{
[super viewDidDisappear:animated];
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
// Return YES for supported orientations
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
-(void)searchBar:(UISearchBar*)searchBar textDidChange:(NSString*)text
{
if(text.length == 0)
{
isFiltered = FALSE;
}
else
{
isFiltered = true;
filteredTableData = [[NSMutableArray alloc] init];
for (Author* author in theauthors)
{ //[NSPredicate predicateWithFormat:@"SELECT * from books where title LIKE %@", searchBar.text];
NSRange nameRange = [author.name rangeOfString:text options:NSAnchoredSearch];
NSRange descriptionRange = [author.genre rangeOfString:text options:NSAnchoredSearch];
if(nameRange.location != NSNotFound || descriptionRange.location != NSNotFound)
{
[filteredTableData addObject:author];
}
}
}
[self.tableView reloadData];
}
/*
-(void) showDetailsForIndexPath:(NSIndexPath*)indexPath
{
NSLog(@"This is the showDetailsForIndexPath");
[self->searchBar resignFirstResponder];
Details* vc = [self.storyboard instantiateViewControllerWithIdentifier:@"Details"];
AuthorVC* author;
if(isFiltered)
{
author = [filteredTableData objectAtIndex:indexPath.row];
}
else
{
author = [theauthors objectAtIndex:indexPath.row];
}
vc.author = author;
[self.navigationController pushViewController:vc animated:true];
NSLog(author);
}
*/
#pragma mark - Table view data source
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
// Return the number of sections.
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
int rowCount;
if(self->isFiltered)
rowCount = filteredTableData.count;
else
rowCount = theauthors.count;
return rowCount;
// Return the number of rows in the section.
//return [self.theauthors count];
}
/*
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender{
// NSString *Title;
// Author *auth = (Author*)segue.destinationViewController;
Details *dv = (Details*)segue.destinationViewController;
dv.labelText.text = author.title;
NSLog(@"Did Enter prepareForSegue");
// labelText.text = @"Hy";
}
*/
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
NSLog(@"This is the one in authorVc");
static NSString *CellIdentifier = @"AuthorsCell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier];
}
int rowCount = indexPath.row;
Author *author = [self.theauthors objectAtIndex:rowCount];
if(isFiltered){
author = [filteredTableData objectAtIndex:indexPath.row];
// UIAlertView *messageAlert = [[UIAlertView alloc]
// initWithTitle:@"Filtered" message:titleString delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
//
// [messageAlert show];
}
else{
author = [theauthors objectAtIndex:indexPath.row];
// UIAlertView *messageAlert = [[UIAlertView alloc]
// initWithTitle:@"Not filtered" message:titleString delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
//
// [messageAlert show];
}
cell.textLabel.text = author.name;
// cell.detailTextLabel.text = author.genre;
//NSString *titleString = [[[NSString alloc] initWithFormat:@"Element number : %d",author.name] autorelease];
return cell;
}
-(NSMutableArray *) authorList{
theauthors = [[NSMutableArray alloc] initWithCapacity:1000000];
NSMutableArray * new2 = [[NSMutableArray alloc ] initWithCapacity:100000];
// authorNAme = theauthors.sortedArrayHint.description;
@try {
NSFileManager *fileMgr = [NSFileManager defaultManager];
NSString *dbPath = [[[NSBundle mainBundle] resourcePath ]stringByAppendingPathComponent:@"data.sqlite"];
BOOL success = [fileMgr fileExistsAtPath:dbPath];
if(!success)
{
NSLog(@"Cannot locate database file '%@'.", dbPath);
}
if(!(sqlite3_open([dbPath UTF8String], &db) == SQLITE_OK))
{
NSLog(@"An error has occured: %@", sqlite3_errmsg(db));
}
// const char *sql = "SELECT F_Keyword FROM wordss";
const char *sql = "SELECT * FROM Sheet1";
sqlite3_stmt *sqlStatement;
if(sqlite3_prepare(db, sql, -1, &sqlStatement, NULL) != SQLITE_OK)
{
NSLog(@"Problem with prepare statement: %@", sqlite3_errmsg(db));
}else{
while (sqlite3_step(sqlStatement)==SQLITE_ROW) {
Author * author = [[Author alloc] init];
//NSString *authorName = author.name;
author.name = [NSString stringWithUTF8String:(char *) sqlite3_column_text(sqlStatement,2)];
author.title = [NSString stringWithUTF8String:(char *) sqlite3_column_text(sqlStatement,4)];
author.genre = [NSString stringWithUTF8String:(char *) sqlite3_column_text(sqlStatement, 6)];
new2 = author.genre;
// NSLog(new2);
authorNAme=author.genre;
//NSLog(author.genre);
[theauthors addObject:author];
}
// authorNAme = author.genre;
}
}
@catch (NSException *exception) {
NSLog(@"Problem with prepare statement: %@", sqlite3_errmsg(db));
}
@finally {
// sqlite3_finalize(sqlStatement);.
// authorNAme = nil;
sqlite3_close(db);
// authorNAme = Nil;
return theauthors;
}
}
- (void)dealloc {
[searchBar release];
[super dealloc];
//[authorNAme release];
}
//- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
//
// /*
// When a row is selected, the segue creates the detail view controller as the destination.
// Set the detail view controller's detail item to the item associated with the selected row.
// */
// if ([[segue identifier] isEqualToString:@"ShowSelectedPlay"]) {
//
// NSIndexPath *selectedRowIndex = [self.tableView indexPathForSelectedRow];
// Details *detailViewController = [segue destinationViewController];
// detailViewController.author = [dataController objectInListAtIndex:selectedRowIndex.row];
// }
//}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
NSLog(@"This is the showDetailsForIndexPath");
[self->searchBar resignFirstResponder];
Details* vc = [self.storyboard instantiateViewControllerWithIdentifier:@"Details"];
AuthorVC* author;
if(isFiltered)
{
author = [filteredTableData objectAtIndex:indexPath.row];
}
else
{
author = [theauthors objectAtIndex:indexPath.row];
}
vc.author = author;
authorNAme = vc.author.genre;
authorNAme2 = vc.author.name ;
NSLog(@"This is the details %@",vc.author.genre);
NSLog(@"This is the authorNAme Variable %@" , authorNAme);
vc.labelText.text = vc.author.genre;
vc.text2.text = vc.author.name;
NSString *titleString = [[[NSString alloc] initWithFormat:@"Element number : %d",indexPath.row] autorelease];
UIAlertView *messageAlert = [[UIAlertView alloc]
initWithTitle:@"Row Selected" message:authorNAme2 delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
[messageAlert show];
[self.navigationController pushViewController:vc animated:true];
/*
//Get the selected country
NSString *selectedAuthors = [theauthors objectAtIndex:indexPath.row];
//NSLog(selectedAuthors);
UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"MainStoryboard" bundle:nil];
Details *dvController = [storyboard instantiateViewControllerWithIdentifier:@"Details"]; //Or whatever identifier you have defined in your storyboard
//authorNAme = selectedAuthors.description;
//Initialize the detail view controller and display it.
//Details *dvController = [[Details alloc] init/*WithNibName:@"Details" bundle:nil*///];
/*
dvController.selectedAuthors = selectedAuthors;
NSString *titleString = [[[NSString alloc] initWithFormat:@"Element number : %d",indexPath.row] autorelease];
UIAlertView *messageAlert = [[UIAlertView alloc]
initWithTitle:@"Row Selected" message:titleString delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
[messageAlert show];*/
// NSString *elem = [new2 objectAtIndex:0];
//NSLog(dvController.labelText.text);
// NSString *titleString = [[[NSString alloc] initWithFormat:@"Author title : %d",indexPath.row] autorelease];
// NSString *titleString2 = [[new2 objectAtIndex:indexPath.row] autorelease];
// NSLog(@"this is the selected row , %s",titleString2);
// authorNAme = titleString;
/* !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! BReak point of SQL Query!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!*/
/*
@try {
NSFileManager *fileMgr2 = [NSFileManager defaultManager];
// NSString *dbPath = [[[NSBundle mainBundle] resourcePath ]stringByAppendingPathComponent:@"dictionary.sqlite"];
//NSString *dbPath = [[[NSBundle mainBundle] resourcePath ]stringByAppendingPathComponent:@"authorsDb2.sqlite"];
// NSString *dbPath = [[[NSBundle mainBundle] resourcePath ]stringByAppendingPathComponent:@"FinalDb.sqlite"];
//NSString *dbPath = [[[NSBundle mainBundle] resourcePath ]stringByAppendingPathComponent:@"xxJuridique-FINAL-OK.sqlite"];
NSString *dbPath2 = [[[NSBundle mainBundle] resourcePath ]stringByAppendingPathComponent:@"data.sqlite"];
BOOL success = [fileMgr2 fileExistsAtPath:dbPath2];
if(!success)
{
NSLog(@"Cannot locate database file '%@'.", dbPath2);
}
if(!(sqlite3_open([dbPath2 UTF8String], &db) == SQLITE_OK))
{
NSLog(@"An error has occured: %@", sqlite3_errmsg(db));
}
NSLog(@"access to the second DB is ok");
// const char *sql = "SELECT F_Keyword FROM wordss";
const char *sql2 = "SELECT field7 FROM Sheet1 WHERE field1 = 'titleString' ";
//NSLog(sql2);
sqlite3_stmt *sqlStatement2;
if(sqlite3_prepare(db, sql2, -1, &sqlStatement2, NULL) != SQLITE_OK)
{ NSLog(@"Problem with prepare the db");
NSLog(@"Problem with prepare statement: %@", sqlite3_errmsg(db));
}else{
// while (sqlite3_step(sqlStatement2)==SQLITE_ACCESS_EXISTS) {
NSLog(@"Starting to prepare the result");
Author * author2 = [[Author alloc] init];
NSLog(@"Author 2 created");
author2.genre2 = [NSString stringWithUTF8String:(char *) sqlite3_column_text(sqlStatement2, 7 )];
NSLog(@"Initialistion of author 2 is ok");
// NSLog(author2.genre);
// authorNAme = author2.genre;
[theauthors addObject:author2];
// }
}
}
@catch (NSException *exception) {
NSLog(@"Problem with prepare statement: %@", sqlite3_errmsg(db));
}
@finally {
// sqlite3_finalize(sqlStatement);.
// authorNAme = nil;
sqlite3_close(db);
// authorNAme = Nil;
return theauthors;
}
*/
//[self.navigationController pushViewController:dvController animated:YES];
}
- (UITableViewCellAccessoryType)tableView:(UITableView *)tableView accessoryTypeForRowWithIndexPath:(NSIndexPath *)indexPath {
//return UITableViewCellAccessoryDetailDisclosureButton;
return UITableViewCellAccessoryDisclosureIndicator;
}
- (void)tableView:(UITableView *)tableView accessoryButtonTappedForRowWithIndexPath:(NSIndexPath *)indexPath {
[self tableView:tableView didSelectRowAtIndexPath:indexPath];
}
@end
DetailsView控制器知道为Details.m：
//
// Details.m
// AuthorsApp
//
// Created by georges ouyoun on 7/17/12.
// Copyright (c) 2012 __MyCompanyName__. All rights reserved.
//
#import "Details.h"
#import "Author.h"
#import "AuthorVC.h"
#import <sqlite3.h>
@interface Details ()
@end
@implementation Details
@synthesize Favo;
@synthesize text2;
@synthesize labelText;
@synthesize selectedAuthors;
@synthesize author , infoRequest;
BOOL PAss = NO;
BOOL SElected2 = NO;
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
// authorNAme = author.genre;
// self.labelText.text =authorNAme;
// Do any additional setup after loading the view.
self.labelText.text = authorNAme;
self.text2.text = authorNAme2;
/* This is where the label text APPearsssssssss */
NSLog(@"Everything is ok now !");
// NSLog(authorNAme);
}
- (void)viewDidUnload
{
// [self setLabelText:nil];
NSLog(@"U have entered view did unload");
[AddBut release];
AddBut = nil;
[self setText2:nil];
[super viewDidUnload];
[self setLabelText:Nil];
[authorNAme release];
// Release any retained subviews of the main view.
}
/*
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender{
if ([segue.identifier isEqualToString:@"AuthorsCell"]) {
[segue.destinationViewController setLabelText:author.title];
}
}
*/
-(void)viewWillAppear:(BOOL)animated
{
//labelText.text = authorNAme;
NSLog(@"U have entered the viewWillAppear tag");
// detailsLabel.text = food.description;
//authorNAme=Nil;
//[self setauthorName:Nil];
}
/*
-(void) viewDidAppear:(BOOL)animated{
labelText.text = @"This is the DidAppearTag";
NSLog(@"U have entered the viewDidAppear tag");
}
*/
-(void) viewWillDisappear:(BOOL)animated{
NSLog(@"This is the view will disappear tag");
//authorNAme.release;
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
return YES;
}
- (void)dealloc {
[labelText release];
[AddBut release];
[text2 release];
[super dealloc];
}
- (IBAction)AddButClick:(UIButton *)sender {
[AddBut setImage:[UIImage imageNamed:@"apple-logo copy.png"] forState:UIControlStateSelected];
[AddBut setImage:[UIImage imageNamed:@"apple-logo copy.png"] forState:UIControlStateHighlighted];
Favo = [[NSMutableArray alloc] initWithCapacity:1000000];
NSLog(authorNAme);
@try {
NSFileManager *fileMgr = [NSFileManager defaultManager];
// NSString *dbPath = [[[NSBundle mainBundle] resourcePath ]stringByAppendingPathComponent:@"dictionary.sqlite"];
//NSString *dbPath = [[[NSBundle mainBundle] resourcePath ]stringByAppendingPathComponent:@"authorsDb2.sqlite"];
// NSString *dbPath = [[[NSBundle mainBundle] resourcePath ]stringByAppendingPathComponent:@"FinalDb.sqlite"];
//NSString *dbPath = [[[NSBundle mainBundle] resourcePath ]stringByAppendingPathComponent:@"xxJuridique-FINAL-OK.sqlite"];
NSString *dbPath = [[[NSBundle mainBundle] resourcePath ]stringByAppendingPathComponent:@"data.sqlite"];
BOOL success = [fileMgr fileExistsAtPath:dbPath];
if(!success)
{
NSLog(@"Cannot locate database file '%@'.", dbPath);
}
if(!(sqlite3_open([dbPath UTF8String], &db) == SQLITE_OK))
{
NSLog(@"An error has occured: %@", sqlite3_errmsg(db));
}
// const char *sql = "SELECT F_Keyword FROM wordss";
const char *sql = "SELECT * FROM Sheet1";
NSLog(@"Successfully selected from database");
sqlite3_stmt *sqlStatement;
if(sqlite3_prepare(db, sql, -1, &sqlStatement, NULL) != SQLITE_OK)
{
NSLog(@"Problem with prepare statement: %@", sqlite3_errmsg(db));
}else{
NSLog(@"Got in the else tag");
while (sqlite3_step(sqlStatement)==SQLITE_ROW /*&& PAss == NO*/) {
NSLog(@"Got in the while tag");
Author * author = [[Author alloc] init];
NSLog(@"Author initialized");
author.name = [NSString stringWithUTF8String:(char *) sqlite3_column_text(sqlStatement,10)];
NSLog(@"Initialization ok");
// NSLog(author.name);
if(/*author.name == @"NO" &&*/ HighLighted == NO){
//const char *sql2 = "INSERT INTO Sheet1 ";
[AddBut setImage:[UIImage imageNamed:@"apple-logo copy.png"] forState:UIControlStateNormal];
NSLog(@"We have not selected it as fav yet");
// [AddBut setSelected:NO]; //btn changes to normal state
NSLog(@"The button was NOt highlighted and now is");
HighLighted = YES;
// PAss = YES;
// [self release];
break;
}
else
{
NSLog(@"We have selected it as fav");
[AddBut setImage:[UIImage imageNamed:@"apple-logo.png"] forState:UIControlStateNormal];
[AddBut setSelected:NO]; //btn changes to normal state
NSLog(@"The button was highlighted and now is NOt");
HighLighted = NO;
break;
// [self viewDidLoad];
// PAss = YES;
}
// [Favo release];
// NSLog(Favo);
// author.name = [NSString stringWithUTF8String:(char *) sqlite3_column_text(sqlStatement,2)];
// author.title = [NSString stringWithUTF8String:(char *) sqlite3_column_text(sqlStatement,2)];
// author.genre = [NSString stringWithUTF8String:(char *) sqlite3_column_text(sqlStatement, 4)];
// [theauthors addObject:author];
}
}
}
@catch (NSException *exception) {
NSLog(@"Problem with prepare statement: %@", sqlite3_errmsg(db));
}
@finally {
// sqlite3_finalize(sqlStatement);
sqlite3_close(db);
return Favo;
}
// [AddBut setSelected:YES];
// if(SElected == YES){
// NSLog(@"The button was highlighted and now not");
//
// [AddBut setImage:[UIImage imageNamed:@"apple-logo.png"] forState:UIControlStateNormal];
// [AddBut setSelected:NO]; //btn changes to highlighted åstate
// SElected = NO;
//
// }
//
// else{
//
// [AddBut setSelected:YES]; //btn changes to normal state
// NSLog(@"The button was NOt highlighted and now is");
// SElected = YES;
//
// }
}
@end
答案 0 :(得分：1)
首先，您必须获取所选行的值; 这是在你的TABLEVIEWCONTROLLER
中- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath*)indexPath {
if(listObject.count!=0){
//you will get the object from the list
ObjectType *selectedObject=(ObjectType*)[listObject objectAtIndex:indexPath.row];
//you can call your view controller (in my example init with nib)
yourDetailViewController = [[YourDetailViewController alloc] initWithNibName:@"YourDetailViewControllerNib" bundle:nil];
//you can set your selected object in order to use it on your detail view controller
yourDetailViewController.objectSelected = selectedObject;
[self.navigationController yourDetailViewController animated:YES];
}
}
这是在您的DETAILVIEWCONTROLLER中;
-(void)objectUpdate:(Object*)selectedObject withDBPath:(NSString *)dbPath{
NSError *errMsg;
if (sqlite3_open([dbPath UTF8String], &database) == SQLITE_OK) {
const char *sql_stmt = [@"CREATE TABLE IF NOT EXISTS iosobjecttable (yourcolumns INTEGER PRIMARY KEY NOT NULL , youranothercolumn VARCHAR)" cStringUsingEncoding:NSUTF8StringEncoding];
if (sqlite3_exec(database, sql_stmt, NULL, NULL, (__bridge void*)errMsg) == SQLITE_OK)
{
// SQL statement execution succeeded
}
if(updateStmt == nil) {
NSString *querySQL = [NSString stringWithFormat:
@"update iosobject set youranothercolumn=%@ where p_event_id=%@", object.changedcomlumn,object.objectid];
const char *query_sql = [querySQL UTF8String];
if(sqlite3_prepare_v2(database, query_sql, -1, &updateStmt, NULL) != SQLITE_OK){
NSAssert1(0, @"Error while creating update statement. '%s'", sqlite3_errmsg(database));
//NSLog(@"%@",errMsg);
}
}
@try {
if(SQLITE_DONE != sqlite3_step(updateStmt)){
NSAssert1(0, @"Error while updating data. '%s'", sqlite3_errmsg(database));
//NSLog(@"%@",errMsg);
}
else{
//NSLog(@"updatingupdatingedelementt %@",tEvent.eventid);
}
sqlite3_reset(updateStmt);
}
@catch (NSException* ex) {
//NSLog(@"Error while updating data. '%s'", sqlite3_errmsg(database));
}
}
}
以及如何调用此函数是这样的;
AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
NSString *dbPath=[appDelegate getDBPath];
[self objectUpdate:objectUpdate withDBPath:dbPath];
在app delegate中你必须在app delegate中编写getDBPath;
- (NSString *) getDBPath {
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory , NSUserDomainMask, YES);
NSString *documentsDir = [paths objectAtIndex:0];
return [documentsDir stringByAppendingPathComponent:@"yourdbname.sqlite"];
}