我试图在Xcode 4.3.3上创建一个搜索引擎，这是一个搜索UITableView的搜索栏。
首先我尝试创建没有动态数据库且没有sqlite连接的搜索引擎，它工作正常，如果在NSMutableArray中预定义的静态元素之间进行搜索，我就有能力。
现在我没有在数组中静态预定义元素，而是想访问sqlite数据库并执行查询，将结果作为单元格字段。 我曾尝试使用FMDB进行连接，但问题是我无法实现。
这是我的代码，我做错了什么？
//
// FilterDemoTableViewController.m
// Created by Elias Rahme.
// Copyright (c) ERC.
//
#import "ViewController.h"
#import "DetailsViewController.h"
#import "Food.h"
#import "FMDatabase.h"
@implementation ViewController
@synthesize allTableData;
@synthesize filteredTableData;
@synthesize searchBar;
@synthesize isFiltered;
- (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];
}
#pragma mark - View lifecycle
- (void)viewDidLoad
{
[super viewDidLoad];
searchBar.delegate = (id)self;
NSString *path = [[NSBundle mainBundle] pathForResource:@"SampleDB" ofType:@"sqlite"];
FMDatabase *db = [[FMDatabase alloc] initWithPath:path];
[db open];
if (![db open]) {
NSLog(@"Could not open db.");
}
else{
NSLog(@"Database is opened");
}
FMResultSet *fResult= [db executeQuery:@"SELECT a_id FROM Description where desc_id=1"];
if( !fResult){
NSLog(@"Could not execute query");
}
else{
NSLog(@"Query executed");
}
eleData = [fResult stringForColumn:@"desc"];
// NSLog([fResult stringForColumn:@"desc"]);
allTableData = [[NSMutableArray alloc] initWithObjects:
[[Food alloc] initWithName:@"test" andDescription:@"TEst" ],
[[Food alloc] initWithName:@"Steak" andDescription:@"Medium"],
[[Food alloc] initWithName:@"Salad" andDescription:@"Caesar"],
[[Food alloc] initWithName:@"Salad" andDescription:@"Bean"],
[[Food alloc] initWithName:@"Fruit" andDescription:@"Apple"],
[[Food alloc] initWithName:@"Potato" andDescription:@"Baked"],
[[Food alloc] initWithName:@"Potato" andDescription:@"Mashed"],
[[Food alloc] initWithName:@"Bread" andDescription:@"White"],
[[Food alloc] initWithName:@"Bread" andDescription:@"Brown"],
[[Food alloc] initWithName:@"Hot Dog" andDescription:@"Beef"],
[[Food alloc] initWithName:@"Hot Dog" andDescription:@"Chicken"],
[[Food alloc] initWithName:@"Hot Dog" andDescription:@"Veggie"],
[[Food alloc] initWithName:@"Pizza" andDescription:@"Pepperonni"],
[[Food alloc] initWithName:@"Pizza" andDescription:@"Pepperonni"],
[[Food alloc] initWithName:@"Hot Dog" andDescription:@"Beef"],
[[Food alloc] initWithName:@"Hot Dog" andDescription:@"Chicken"],
[[Food alloc] initWithName:@"Hot Dog" andDescription:@"Veggie"],
[[Food alloc] initWithName:@"Pizza" andDescription:@"Pepperonni"],
[[Food alloc] initWithName:@"Pizza" andDescription:@"Pepperonni"],
[[Food alloc] initWithName:@"Hot Dog" andDescription:@"Beef"],
[[Food alloc] initWithName:@"Hot Dog" andDescription:@"Chicken"],
[[Food alloc] initWithName:@"Hot Dog" andDescription:@"Veggie"],
[[Food alloc] initWithName:@"Pizza" andDescription:@"Pepperonni"],
[[Food alloc] initWithName:@"Pizza" andDescription:@"Pepperonni"],
nil ];
[db close];
}
/*
NSLog(@"Data from ele.h file");
/* Now here we have to write the code from the database to display the details */
/*
aElephant = [[NSMutableArray alloc] init];
NSLog(@"Data base is entering");
/*
Here we have to set the path
We are creating the path for the datbase file in order to access
*/
/*
NSString *path = [[NSBundle mainBundle] pathForResource:@"SampleDB" ofType:@"sqlite"];
NSLog(@"No problem with the path");
/* FMDatabase here is used to take the database path */
/*
FMDatabase *db = [[FMDatabase alloc] initWithPath:path];
/* Here we are opening the datase in order to access it */
/*
[db open];
NSLog(@"Database Opened");
/*
Then the next step here is taking the database result using the sqlquery and then carrying that result into the resultset object
Resultset for Elephant: select * from Description where a_id=1; here description is the table, a_id is the id of Elephant it is
the primary key in animals table
/* */
/* NSLog(@"NOt yet executing the query");
FMResultSet *fResult= [db executeQuery:@"SELECT * FROM description"];
NSLog(@"Did Execute the Query");
// NSLog(*fResult);
//Now we have to take these results in to a loop and then repeteadly loop it in order to get all the data in a our Array Object
while([fResult next])
{
/* /* taking results from database to a string "eleData" */
/* eleData = [fResult stringForColumn:@"desc"];
/* adding data from the string object to Array */
//[aElephant addObject:eleData];
/* Checking weather data has come or not */
// NSLog(@"The data is %@=",eleData);
//}
/* Closing the Database */
//[db close];
- (void)viewDidUnload
{
[self setSearchBar:nil];
[super viewDidUnload];
}
- (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);
}
#pragma mark - Table view data source
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
int rowCount;
if(self.isFiltered)
rowCount = filteredTableData.count;
else
rowCount = allTableData.count;
return rowCount;
// return [aElephant count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = @"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil)
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier];
/*
if(isFiltered)
eData = [filteredTableData objectAtIndex:indexPath.row];
else
eData = [allTableData objectAtIndex:indexPath.row];
*/
// NSLog(aElephant);
/* NSString *eData = [aElephant objectAtIndex:indexPath.row];
cell.textLabel.text = eData;
return cell;*/
Food* food;
if(isFiltered)
food = [filteredTableData objectAtIndex:indexPath.row];
else
food = [allTableData objectAtIndex:indexPath.row];
cell.textLabel.text = food.name;
cell.detailTextLabel.text = food.description;
return cell;
}
#pragma mark - Table view delegate
-(void)searchBar:(UISearchBar*)searchBar textDidChange:(NSString*)text
{
if(text.length == 0)
{
isFiltered = FALSE;
}
else
{
isFiltered = true;
filteredTableData = [[NSMutableArray alloc] init];
for (Food* food in allTableData)
{
NSRange nameRange = [food.name rangeOfString:text options:NSCaseInsensitiveSearch];
NSRange descriptionRange = [food.description rangeOfString:text options:NSCaseInsensitiveSearch];
if(nameRange.location != NSNotFound || descriptionRange.location != NSNotFound)
{
[filteredTableData addObject:food];
}
}
}
[self.tableView reloadData];
}
- (void)tableView:(UITableView *)tableView accessoryButtonTappedForRowWithIndexPath:(NSIndexPath *)indexPath
{
[self showDetailsForIndexPath:indexPath];
}
-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
[self showDetailsForIndexPath:indexPath];
}
-(void) showDetailsForIndexPath:(NSIndexPath*)indexPath
{
[self.searchBar resignFirstResponder];
DetailsViewController* vc = [self.storyboard instantiateViewControllerWithIdentifier:@"DetailsViewController"];
Food* food;
if(isFiltered)
{
food = [filteredTableData objectAtIndex:indexPath.row];
}
else
{
food = [allTableData objectAtIndex:indexPath.row];
}
vc.food = food;
[self.navigationController pushViewController:vc animated:true];
}
@end
简而言之，我希望它具有sqlite数据库中的值，而不是initWithName具有静态值。
任何帮助将受到高度赞赏
谢谢你的帮助。
答案 0 :(得分：0)
问题是我没有回来然后正确访问数据库，并没有看到发生的变化，因为我打开我的本地数据库时，我应该在我的文档中打开iPhone模拟器中的那个。