ios FMDB数据库添删改查应用

本文原创，转载请注明出处！

　　哦吼吼，又研究了几天，把FMDB这个封装好的数据库搞定了，写了个简单的例子，基于FMDB的添删改查操作，界面很一般了，代码可能比较乱，希望不要伤了各位的眼睛。依旧是纯代码实现的，没有用到任何IB，其中添加删除更改的操作都非常简单，不需要做太多操作，只需要用到FMDB封装好的executeUpdate方法就行了。搜索功能用到了UISearchDisplayController这个控件，因为以前没有用过，研究了一天才搞定。下面对界面做简单的说明：



　　整个界面使用一个UITabBarController实现的，一共有三个TabBarItem，第一个是通讯录，我重写了cell，在每一行可以显示姓名，电话和ID。我要说明一下ID，ID最好每个人的都不要写成一样的，如果两个人的姓名一样，ID也一样的话，在删除一个人的时候会把两个人的信息都删掉。右上角是更新button，先选择某一项，再点那个button就可以进入更新界面。下面来看更新界面：



进入更新界面，可以更新姓名和电话，ID是不可更改的，为什么呢，因为在操作数据库的时候必须要有一个主键（PRIMARY KEY），作为区分每条数据的标识。注意右上角是save。下面来看添加信息的页面，也就是第二个TabBarItem：



可以添加姓名，电话和ID，注意ID不要和其他的相同！再来看第三个TabBarItem，搜索功能，这是我新学的一个知识，用UISearchDisplayController和UISearchBar来实现的搜索，因为用这两个可以达到最好的图像效果



搜索出来的数据点击某一行可以进入详情：



这个页面就简单了，没什么可说的了，一目了然。

下面为大家呈上代码，首先要在AppDelegate.m文件里做修改，要放入一个UITabBar

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
// Override point for customization after application launch.
self.viewController = [[[ViewController alloc] initWithNibName:@"ViewController" bundle:nil] autorelease];
//因为有三个tabBarItem，我把系统默认的viewController放在了第一个，然后再新建两个继承自UIViewController的类AddUserInfo和SearchInfo
UINavigationController *viewController = [[UINavigationController alloc]initWithRootViewController:self.viewController];
viewController.tabBarItem = [[UITabBarItem alloc]initWithTabBarSystemItem:UITabBarSystemItemContacts tag:101];
//将viewController初始化为第一个tabBarItem
AddUserInfo *adduserViewController = [[AddUserInfo alloc]init];
adduserViewController.title = @"添加用户信息";
adduserViewController.tabBarItem = [[UITabBarItem alloc]initWithTabBarSystemItem:UITabBarSystemItemTopRated tag:102];
//将adduserViewController初始化为第二个tabBarItem
SearchInfo *searchViewController = [[SearchInfo alloc]init];
searchViewController.tabBarItem = [[UITabBarItem alloc]initWithTabBarSystemItem:UITabBarSystemItemSearch tag:103];
searchViewController.title = @"搜索信息";
//将searchViewController初始化为第三个tabBarItem，现在已经准备了UITabBarController上的三个tabBarItem了，但是每一个tabBarItem都需要放到UINavigationController上来控制视图，在初始化两个UINavigationController，还有一个在上面。
UINavigationController *nav1= [[UINavigationController alloc]initWithRootViewController:adduserViewController];

UINavigationController *nav2 = [[UINavigationController alloc]initWithRootViewController:searchViewController];

NSArray *ViewControllerArray = [[NSArray alloc]initWithObjects:viewController,nav1,nav2, nil];

//    将三个UINavigationController添加到一个数组里，tabBarItem已经搞定了，但是主要的UITabBarController我们现在来初始化。
UITabBarController *tabBarController = [[UITabBarController alloc]init];
//注意这里的用法，tabBarController.viewControllers是tabBarController的一个数组类型的属性，它存放的是UINavigationController
tabBarController.viewControllers = ViewControllerArray;
tabBarController.selectedIndex = 0;//初始显示第一个tabBarItem
tabBarController.delegate = self;//别忘了设置代理，在头文件里要加上 <UIApplicationDelegate,UITabBarControllerDelegate>这两个

self.window.rootViewController = tabBarController;
[self.window makeKeyAndVisible];

[nav1 release];
[nav2 release];
[tabBarController release];
[ViewControllerArray release];
[searchViewController release];
[adduserViewController release];
[viewController release];

return YES;
}

接下来去下载FMDB工程项目https://github.com/ccgus/fmdb.git

下载下来的是一个demo，大家可以把src文件夹拖出来再改名为FMDB，拖进自己的项目及就行了

在项目里添加libsqlite3.dylib，SenTestingKit.framework两个库，还有头文件#import "FMDatabase.h"和
#import "FMDatabaseQueue.h"

来看看通讯录页面ViewController.h

#import <UIKit/UIKit.h>
#import "FMDatabase.h"
#import "FMDatabaseQueue.h"

@class dataFromDataBase;
@interface ViewController : UIViewController<UITableViewDelegate,UITableViewDataSource>
{

}
@property (nonatomic, retain) NSString * dbPath;
@property (nonatomic, retain) NSMutableArray *nameArray;
@property (nonatomic, retain) NSMutableArray *phoneArray;
@property (nonatomic, retain) NSMutableArray *IDArray;

@property (nonatomic, retain) UITableView *table;
- (void)createTable;
@end

@interface dataFromDataBase : NSObject {//新建一个类，专门用于保存数据
@private
NSString *nameFromClass;
NSString *phoneFromClass;
NSString *IDFromClass;
NSMutableArray *nameArrayFromClass;
}
+(dataFromDataBase*)shareFromDataBase;//神奇的单例
@property(retain,nonatomic) NSString *nameFromClass;

@property(retain,nonatomic)NSString *phoneFromClass;

@property(retain,nonatomic)NSString *IDFromClass;
@property(retain,nonatomic)NSMutableArray *nameArrayFromClass;

@end

ViewController.m

//
//  ViewController.m
//  tabbartest
//
//  Created by changjian on 12-12-8.
//  Copyright (c) 2012年 __MyCompanyName__. All rights reserved.
//

#import "ViewController.h"
#import "AddUserInfo.h"

@implementation ViewController
@synthesize dbPath;
@synthesize nameArray,phoneArray,IDArray;
@synthesize table;

- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Release any cached data, images, etc that aren't in use.
}

#pragma mark - View lifecycle

- (void)viewDidLoad
{
[super viewDidLoad];
self.title = @"通讯录";
UITableView *tableView = [[UITableView alloc]initWithFrame:CGRectMake(0, 0, 320, 369) style:UITableViewStylePlain];
tableView.delegate = self;
tableView.dataSource = self;
self.table = tableView;
[self.view addSubview:tableView];

UIBarButtonItem *refreshBtn = [[UIBarButtonItem  alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemRefresh target:self action:@selector(modifyDatabase)];
self.navigationItem.rightBarButtonItem = refreshBtn;
[refreshBtn release];

}

#pragma mark -tableview-
- (UITableViewCell*)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
//    NSString *CustomIdentifier =  [NSString stringWithFormat:@"cell%d",indexPath.row];

static NSString *CustomIdentifier = @"cell";
//    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CustomIdentifier];
UITableViewCell *cell = nil;
if (cell == nil) {
cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CustomIdentifier];
}
//    while ([cell.contentView.subviews lastObject] != nil){
[(UIView*)[cell.contentView.subviews lastObject]removeFromSuperview];//当再次刷新的时候会自动添加新的cell，出现叠加情况，用这种方法可以去掉上一次添加的cell.contentView.subviews
if (indexPath.row == 0)//这里注意，因为第一行不显示数据，所以做个判断
cell.selectionStyle = UITableViewCellSelectionStyleNone;
if (indexPath.row > 0) {//从第二行开始显示数据
//        cell.textLabel.text = [dataArray objectAtIndex:(indexPath.row - 1)];//注意这里是从indexPath.row - 1行开始
UILabel *nameLabel = [[UILabel alloc]initWithFrame:CGRectMake(0+40, 10, 70, 30)];
UILabel *phoneLabel = [[UILabel alloc]initWithFrame:CGRectMake(90+40, 10, 70, 30)];
UILabel *IDLabel = [[UILabel alloc]initWithFrame:CGRectMake(180+40, 10, 70, 30)];
nameLabel.text = [self.nameArray objectAtIndex:(indexPath.row-1)];
IDLabel.text = [self.IDArray objectAtIndex:(indexPath.row-1)];
phoneLabel.text = [self.phoneArray objectAtIndex:(indexPath.row-1)];
[cell.contentView addSubview:nameLabel];
[cell.contentView addSubview:IDLabel];
[cell.contentView addSubview:phoneLabel];
[nameLabel release];
[IDLabel release];
[phoneLabel release];
}    else
{
for (int i = 0; i < 3; i ++) {
UILabel *label = [[UILabel alloc]initWithFrame:CGRectMake(90 * i + 40, 10, 70 , 30)];
NSArray *array = [NSArray arrayWithObjects:@"姓名",@"电话",@"ID", nil];
label.text = [array objectAtIndex:i];
label.backgroundColor = [UIColor clearColor];
[cell.contentView addSubview:label];
[label release];
label = nil;
}
}
//    }
return cell;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return [nameArray count] + 1;//注意这里，因为第一行不显示数据，返回要加一行
}

- (NSIndexPath*)tableView:(UITableView *)tableView willSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
if (indexPath.row == 0) {
return nil;//让第一行不能点击
}
else
return indexPath;
}

- (void)createTable//创建数据库中表的方法，利用封装好的库很简单
{
NSFileManager *fileManager = [NSFileManager defaultManager];
if (![fileManager fileExistsAtPath:self.dbPath]) {
NSLog(@"表不存在，创建表");
FMDatabase *db =[FMDatabase databaseWithPath:self.dbPath];
if ([db open]) {
NSString *sql = @"CREATE TABLE 'USER'('id' INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL, 'name' VARCHAR(20),'phone' VARCHAR(20),'idcode' VARCHAR(30))    ";//sql语句
BOOL success = [db executeUpdate:sql];
if (!success) {
NSLog(@"error when create table ");
}else{
NSLog(@"create table succeed");
}
[db close];
}else{
NSLog(@"database open error");
}
}
}

- (void)getAllDatabase//从数据库中获得所有数据
{
FMDatabase *db = [FMDatabase databaseWithPath:self.dbPath];
if ([db open]) {
NSString *sql = @"SELECT * FROM USER";
FMResultSet *rs = [db executeQuery:sql];
while ([rs next]) {
NSString *name = [rs stringForColumn:@"name"];
NSString *phone = [rs stringForColumn:@"phone"];
NSString *ID = [rs stringForColumn:@"idcode"];

[self.nameArray addObject:name];
[self.phoneArray addObject:phone];
[self.IDArray addObject:ID];
}
[[dataFromDataBase shareFromDataBase].nameArrayFromClass arrayByAddingObjectsFromArray:self.nameArray];
NSLog(@"self.nameArray==%@",self.nameArray);
[db close];
[table reloadData];
}

}

- (void)modifyDatabase//选中相应的行，进入更新界面，注意这里没有对数据库进行操作
{
NSIndexPath *indexPath = [self.table indexPathForSelectedRow];

if (indexPath == nil) {
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"提示"
message:@"请选择要更新的项"
delegate:self
cancelButtonTitle:@"好"
otherButtonTitles:nil];
[alert show];
[alert release];
return;
}
else{
AddUserInfo *modify = [[AddUserInfo alloc]init];        modify.operateType = 1;
//下面的方法是将选中的行的数据存进单例，再传到另一个类里面
[dataFromDataBase shareFromDataBase].nameFromClass = [self.nameArray objectAtIndex:(indexPath.row-1)];
[dataFromDataBase shareFromDataBase].IDFromClass = [self.IDArray objectAtIndex:(indexPath.row-1)];
[dataFromDataBase shareFromDataBase].phoneFromClass = [self.phoneArray objectAtIndex:(indexPath.row-1)];
NSLog(@"datafromdatabase.nameFromClass==%@",[dataFromDataBase shareFromDataBase].nameFromClass);

[self.navigationController pushViewController:modify animated:YES];//跳转到修改页面
[modify release];
}
}

- (void)viewDidUnload
{
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}

- (void)dealloc {
[nameArray release];
[phoneArray release];
[IDArray release];
[super dealloc];
}

- (void)viewWillAppear:(BOOL)animated
{

NSString *document = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)objectAtIndex:0];
NSString *path = [document stringByAppendingPathComponent:@"USER.sqlite"];
self.dbPath = path;
//注意以上三句话是获取数据库路径必不可少的，在viewDidload之前就已经准备好了
nameArray = [[NSMutableArray alloc]init];
phoneArray = [[NSMutableArray alloc]init];
IDArray = [[NSMutableArray alloc]init];
[self createTable];
[self getAllDatabase];
}

- (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 != UIInterfaceOrientationPortraitUpsideDown);
}

@end

@implementation dataFromDataBase//这个类专门用来保存数据
@synthesize nameFromClass,phoneFromClass,IDFromClass;
@synthesize nameArrayFromClass;

static dataFromDataBase *sharedInstance = nil;
+(dataFromDataBase*)shareFromDataBase//伟大的单例，
{
if (sharedInstance == nil) {
sharedInstance = [[dataFromDataBase alloc]init];
}
return sharedInstance;
}

- (id)init {
self = [super init];
if (self) {
nameFromClass = @"";
phoneFromClass = @"";
IDFromClass = @"";
nameArrayFromClass = [[NSMutableArray alloc]initWithCapacity:0];
}
return self;
}

- (void)dealloc {
if (nameFromClass!= nil){
[nameFromClass release];
}
if (phoneFromClass!=nil){
[phoneFromClass release];
}
if (IDFromClass != nil){
[IDFromClass release];
}
if (nameArrayFromClass != nil) {
[nameArrayFromClass release];
}
[super dealloc];
}

@end

下面是AddUserInfo.h文件

#import <UIKit/UIKit.h>
#import "ViewController.h"

@interface AddUserInfo : UIViewController<UITextFieldDelegate,UIAlertViewDelegate>
{
int operateType;//保存操作类型，0是添加，1是修改
}
- (void)createTable;
@property (retain,nonatomic)NSMutableArray *textFieldArray;
@property (retain,nonatomic)NSString *dbPath;
@property (retain,nonatomic)UITextField *nameTextField;
@property (retain,nonatomic)UITextField *phoneTextField;
@property (retain,nonatomic)UITextField *IDTextField;
@property (nonatomic,assign)int operateType;
@end

AddUserInfo.m文件

//
//  AddUserInfo.m
//  tabbartest
//
//  Created by changjian on 12-12-8.
//  Copyright (c) 2012年 __MyCompanyName__. All rights reserved.
//

#import "AddUserInfo.h"
#import "FMDatabase.h"
#import "FMDatabaseQueue.h"
#import "UserDetailInfo.h"

@implementation AddUserInfo
@synthesize textFieldArray;
@synthesize dbPath;
@synthesize nameTextField;
@synthesize phoneTextField;
@synthesize IDTextField;
@synthesize operateType;

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
textFieldArray = [[NSMutableArray alloc]init];
}
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
{
[super viewDidLoad];
NSString *doc = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
NSString *path = [doc stringByAppendingPathComponent:@"user.sqlite"];
NSLog(@"path===%@",path);
self.dbPath = path;

NSArray *array = [NSArray arrayWithObjects:@"姓名",@"电话",@"ID", nil];
for (int i = 0; i < 3 ; i++)
{
UILabel *label = [[UILabel alloc]initWithFrame:CGRectMake( 70,i * 40 + 34, 100, 30)];
label.text = [array objectAtIndex:i];
[self.view addSubview:label];
}

nameTextField = [[UITextField alloc]initWithFrame:CGRectMake(150, 38, 100, 30)];
nameTextField.borderStyle = UITextBorderStyleRoundedRect;
nameTextField.placeholder = @"请输入姓名";
nameTextField.delegate = self;
[self.view addSubview:nameTextField];
phoneTextField = [[UITextField alloc]initWithFrame:CGRectMake(150, 78, 100, 30)];
phoneTextField.borderStyle = UITextBorderStyleRoundedRect;
phoneTextField.placeholder = @"请输入电话";
phoneTextField.delegate = self;
[self.view addSubview:phoneTextField];
IDTextField = [[UITextField alloc]initWithFrame:CGRectMake(150, 118, 100, 30)];
IDTextField.borderStyle = UITextBorderStyleRoundedRect;
IDTextField.placeholder = @"请输入ID";
IDTextField.delegate = self;
[self.view addSubview:IDTextField];
if (operateType == 1) {//operateType == 1时为修改

nameTextField.text = [dataFromDataBase shareFromDataBase].nameFromClass;
IDTextField.text = [dataFromDataBase shareFromDataBase].IDFromClass;
phoneTextField.text = [dataFromDataBase shareFromDataBase].phoneFromClass;
IDTextField.enabled = NO;
NSLog(@"datafromdatabase.nameFromClass=%@",[dataFromDataBase shareFromDataBase].nameFromClass);

}
NSLog(@"operateType==%d",operateType);
if (operateType == 0){
UIBarButtonItem *addBtn = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemAdd target:self action:@selector(addNewUserInfo)];
self.navigationItem.rightBarButtonItem = addBtn;
}
if(operateType == 1){//这里是后来添加的，其实可以放到上面
UIBarButtonItem *addBtn = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemSave target:self action:@selector(addNewUserInfo)];
self.navigationItem.rightBarButtonItem = addBtn;

}

// Do any additional setup after loading the view from its nib.
}

- (void)addNewUserInfo//添加用户信息的方法，用FMDB封装好的方法
{
FMDatabase *db = [[FMDatabase alloc]initWithPath:self.dbPath];
NSString *mes = nil;
if ([db open]) {

if (nameTextField.text.length == 0||phoneTextField.text.length == 0||IDTextField.text.length == 0){
mes = @"请完成填写信息";
}else{
NSLog(@"姓名==%@,电话==%@,ID==%@",nameTextField.text,phoneTextField.text,IDTextField.text);
NSString *sql= nil;
if (operateType == 0){//执行插入操作
sql = @"INSERT INTO USER (name,phone,idcode) VALUES (?,?,?) ";
}else if(operateType == 1)//执行更新操作
{
sql = @"UPDATE USER  SET name = ? , phone = ? where idcode = ?";

NSLog(@"有没有执行？");
}

BOOL res = [db executeUpdate:sql,nameTextField.text,phoneTextField.text,IDTextField.text];
if (!res) {
NSLog(@"error to insert data");
mes = @"数据插入错误";
}else{
NSLog(@"insert succeed");
mes = @"数据插入成功";
}
}
}else{
NSLog(@"数据库打开失败") ;
}
UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"提示" message:mes delegate:nil cancelButtonTitle:@"确定" otherButtonTitles:nil, nil];
[alert setTag:101];
alert.delegate = self;
[alert show];
[alert release];
[db close];
}

- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{
if (alertView.tag == 101 && buttonIndex == 0) {
if (operateType == 0)//如果是添加就留在该页，如果是修改就跳回上一页
{
[nameTextField resignFirstResponder];
[phoneTextField resignFirstResponder];
[IDTextField resignFirstResponder];
nameTextField.text = @"";
phoneTextField.text = @"";
IDTextField.text = @"";
}else{
[self.navigationController popViewControllerAnimated:YES];
}
}
}

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
[nameTextField resignFirstResponder];
[phoneTextField resignFirstResponder];
[IDTextField resignFirstResponder];
}//让键盘隐藏

- (void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:YES];
}

- (void)viewDidUnload
{
[super viewDidUnload];

// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}

- (void)dealloc {
[nameTextField release];
[phoneTextField release];
[IDTextField release];

[textFieldArray release];
[super dealloc];
}

-(void)viewWillDisappear:(BOOL)animated//页面将要消失的时候执行，将UITextField清空
{
[super viewWillDisappear:YES];
nameTextField.text = nil;
phoneTextField.text = nil;
IDTextField.text = nil;
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
// Return YES for supported orientations
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}

@end

下面是SearchInfo.h文件,一定要注意这个类是继承UITableViewController，不是UIViewController！！！

//
//  SearchInfo.h
//  tabbartest
//
//  Created by changjian on 12-12-8.
//  Copyright (c) 2012年 __MyCompanyName__. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface SearchInfo : UITableViewController<UISearchDisplayDelegate,UITableViewDelegate,UITableViewDataSource,UISearchBarDelegate>
{
UISearchDisplayController *searchController;
NSString *namestr;
NSString *phonestr;
NSString *IDstr;
}
@property (retain,nonatomic)NSString *dbpath;
@property (retain,nonatomic)NSMutableArray *searchResults;//用于保存搜索出姓名的结果
@property (retain,nonatomic)NSMutableArray *searchPhoneResults;//用来保存搜索的电话信息
@property (retain,nonatomic)NSMutableArray *searchIDResult;//用来保存搜索的ID信息
@property (retain,nonatomic)NSMutableArray *nameArray;//保存搜索之前的姓名信息
@property (retain,nonatomic)NSMutableArray *phoneArray;//保存搜索之前的电话信息
@property (retain,nonatomic)NSMutableArray *IDArray;//保存搜索之前的ID信息
@property (nonatomic,assign)BOOL searchWasActive;
@property (nonatomic,assign)NSString *savedSearchTerm;//这个好像没用了
@property (nonatomic,retain)NSString *namestr;
@property (nonatomic,retain)NSString*phonestr;
@property (nonatomic,retain)NSString*IDstr;

- (void)getAllDatabase;
@end

SearchInfo.m文件

//
//  SearchInfo.m
//  tabbartest
//
//  Created by changjian on 12-12-8.
//  Copyright (c) 2012年 __MyCompanyName__. All rights reserved.
//

#import "SearchInfo.h"
#import "FMDatabase.h"
#import "ViewController.h"
#import "UserDetailInfo.h"

@implementation SearchInfo
@synthesize dbpath;
@synthesize searchResults,searchPhoneResults,searchIDResult;
@synthesize nameArray,phoneArray,IDArray;
@synthesize searchWasActive;
@synthesize savedSearchTerm;
@synthesize namestr,phonestr,IDstr;

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
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
{
[super viewDidLoad];
//搜索比较复杂，既要初始化UISearchBar，又要初始化UISearchDisplayController，然后还要写UITableViewDelegate里的-(UITableViewCell*)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath和-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section方法，还要设置一大堆代理，慢慢往下看
UISearchBar *search = [[[UISearchBar alloc]initWithFrame:CGRectMake(0, 0, self.view.bounds.size.width -50, 44)]autorelease];
search.placeholder = @"请输入姓名";
search.autocorrectionType = UITextAutocorrectionTypeNo;//不自动纠错，貌似没啥用
search.autocapitalizationType = UITextAutocapitalizationTypeAllCharacters;//所有字母大写 ，也没啥用

search.showsScopeBar = YES;
search.delegate = self;//UISearchBar设置代理
search.keyboardType = UIKeyboardTypeNamePhonePad;
self.tableView.tableHeaderView = search;
self.tableView.dataSource = self;

searchController = [[UISearchDisplayController alloc]initWithSearchBar:search contentsController:self];
searchController.active = NO;

searchController.delegate = self;//UISearchDisplayController设置代理

searchController.searchResultsDelegate=self;//还是代理

searchController.searchResultsDataSource = self;//有完没完
[search release];
NSString *document = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)objectAtIndex:0];
NSString *path = [document stringByAppendingPathComponent:@"user.sqlite"];
NSLog(@"path==%@",path);
self.dbpath = path;
self.tableView.delegate = self;//tableView的代理，为什么这么写，因为这个类是继承UITableView的，要注意！不是继承UIViewController的！
self.tableView.dataSource = self;
nameArray = [[NSMutableArray alloc]initWithCapacity:0];
phoneArray = [[NSMutableArray alloc]initWithCapacity:0];
IDArray= [[NSMutableArray alloc]initWithCapacity:0];

[self getAllDatabase];
[self.tableView reloadData];

// Do any additional setup after loading the view from its nib.
}

- (void)viewWillAppear:(BOOL)animated
{
self.searchWasActive = [self.searchDisplayController isActive];
if (self.searchDisplayController.searchBar != 0)
{
self.searchDisplayController.searchBar.text = nil;
[self.searchDisplayController.searchBar resignFirstResponder];
[self.searchDisplayController setActive:NO];//在进入搜索页面之前将其设置为不活动，大家可以试试改成活动看看是什么样
}
}

- (void)getAllDatabase//要重新获取数据库信息，因为执行完删除之后数据库变了
{
FMDatabase *db = [FMDatabase databaseWithPath:self.dbpath];
if ([db open]) {
NSString *sql = @"SELECT * FROM USER";
FMResultSet *rs = [db executeQuery:sql];
while ([rs next]) {
NSString *name = [rs stringForColumn:@"name"];
NSString *phone = [rs stringForColumn:@"phone"];
NSString *ID = [rs stringForColumn:@"idcode"];

[self.nameArray addObject:name];
[self.phoneArray addObject:phone];
[self.IDArray addObject:ID];
}
self.searchResults = [[NSMutableArray alloc]initWithArray:nameArray copyItems:YES];
self.searchPhoneResults = [[NSMutableArray alloc]initWithArray:phoneArray copyItems:YES];
self.searchIDResult = [[NSMutableArray alloc]initWithArray:IDArray copyItems:YES];
NSLog(@"search from nameArray==%@",self.nameArray);
[db close];
}
}

#pragma mark -tableview-

-(UITableViewCell*)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
//    self.tableView = tableView;
static NSString *cellIdentifier = @"cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier];
}
cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
if ([tableView isEqual:self.searchDisplayController.searchResultsTableView]) {
cell.textLabel.text = [searchResults objectAtIndex:indexPath.row];
//        cell.detailTextLabel.text = [NSString stringWithFormat:@"电话：%@",[searchResults objectAtIndex:indexPath.row]];//不知道为什么不显示cell.detailTextLabel.text ，有人知道的话告诉我一下
}else{
cell.textLabel.text = [self.nameArray objectAtIndex:indexPath.row];
}
return cell;
}

-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
NSInteger row = 0;
if ([tableView isEqual:self.searchDisplayController.searchResultsTableView]) {//记住这个格式，如果当前的table就是用于显示所搜信息的table的话。因为UISearchDisplayController这货自带一个table
row = [self.searchResults count];
}else{
[self.nameArray count];
}
return row;
}

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
UserDetailInfo *detailInfo = [[UserDetailInfo alloc]init];
detailInfo.nameStr = [self.searchResults objectAtIndex:indexPath.row];
detailInfo.phoneStr = [self.searchPhoneResults objectAtIndex:indexPath.row];
detailInfo.IDsStr = [self.searchIDResult objectAtIndex:indexPath.row];
NSLog(@"self.namestr==%@",self.namestr);

NSArray *array = [self.navigationController viewControllers];//先获取视图控制器数组
UINavigationController *nav = [array objectAtIndex:[array count] - 1];//获取当前的导航试图控制器
[nav.navigationController pushViewController:detailInfo animated:YES];//跳转到删除页面
[detailInfo release];
}

#pragma mark -UISearchControllerDisplay-//设置搜索范围
//下面注意了，下面的方法是实现搜索功能的，后面两个长得很像的方法是UISearchControllerDisplay代理里的方法，我也搞不懂是干什么用的，他们的格式很固定，大家记住就行了。

- (void)filterContentForSearchText:(NSString*)searchText scope:(NSString*)scope
{
[self searchBarSearchButtonClicked:self.searchDisplayController.searchBar];

}

- (void)searchBarSearchButtonClicked:(UISearchBar *)searchBar//从数据库搜索
{
FMDatabase *db = [FMDatabase databaseWithPath:self.dbpath];
if ([db open]) {

[searchResults removeAllObjects];
[searchPhoneResults removeAllObjects];
[searchIDResult removeAllObjects];
NSString *sql = @"SELECT * FROM USER WHERE name like ?";
FMResultSet *rs = [db executeQuery:sql,searchBar.text];
while ([rs next]) {
self.namestr = [rs stringForColumn:@"name"];
self.phonestr = [rs stringForColumn:@"phone"];
self.IDstr = [rs stringForColumn:@"idcode"];

[self.searchResults addObject:namestr];
[self.searchPhoneResults addObject:phonestr];
[self.searchIDResult addObject:IDstr];
}

NSLog(@"searchResults == %@",searchResults);
NSLog(@"searchPhoneResults==%@",searchPhoneResults);
NSLog(@"searchIDResult==%@",searchIDResult);
NSLog(@"search===%@",searchBar.text);

}
[db close];

}

#pragma mark -
#pragma mark UISearchDisplayController Delegate Methods设置代理方法

- (BOOL)searchDisplayController:(UISearchDisplayController *)controller shouldReloadTableForSearchString:(NSString *)searchString
{
[self filterContentForSearchText:searchString scope:
[[self.searchDisplayController.searchBar scopeButtonTitles] objectAtIndex:[self.searchDisplayController.searchBar selectedScopeButtonIndex]]];

// Return YES to cause the search result table view to be reloaded.
return YES;
}

- (BOOL)searchDisplayController:(UISearchDisplayController *)controller shouldReloadTableForSearchScope:(NSInteger)searchOption
{
[self filterContentForSearchText:[self.searchDisplayController.searchBar text] scope:
[[self.searchDisplayController.searchBar scopeButtonTitles] objectAtIndex:searchOption]];

// Return YES to cause the search result table view to be reloaded.
return YES;
}

- (void)viewDidUnload
{
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
// Return YES for supported orientations
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
- (void)dealloc {
[nameArray release];
[phoneArray release];
[IDArray release];
[searchController release];
[searchResults release];
[searchPhoneResults release];
[searchIDResult release];

[super dealloc];
}

@end

最难的部分完了，接下来就简单多了！

最后是删除信息界面UserDetailInfo.h

@interface UserDetailInfo : UIViewController<UIAlertViewDelegate>
{

}

@property(retain,nonatomic)NSString *dbpath;
@property(retain,nonatomic)NSString *nameStr;
@property(retain,nonatomic)NSString *phoneStr;
@property(retain,nonatomic)NSString *IDsStr;

@end

UserDetailInfo.m

//
//  UserDetailInfo.m
//  tabbartest
//
//  Created by changjian on 12-12-10.
//  Copyright (c) 2012年 __MyCompanyName__. All rights reserved.
//

#import "UserDetailInfo.h"
#import "FMDatabase.h"

@implementation UserDetailInfo
@synthesize dbpath;
@synthesize nameStr,phoneStr,IDsStr;

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
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
{
[super viewDidLoad];
self.title = @"详细信息";
NSArray *array = [NSArray arrayWithObjects:@"姓名:",@"电话:",@"ID:", nil];
NSArray *array2 = [NSArray arrayWithObjects:self.nameStr,self.phoneStr,self.IDsStr, nil];

for (int i = 0; i < 3 ; i++)
{
UILabel *label = [[UILabel alloc]initWithFrame:CGRectMake( 70,i * 40 + 34, 100, 30)];
label.text = [array objectAtIndex:i];
[self.view addSubview:label];

UILabel *label2 = [[UILabel alloc]initWithFrame:CGRectMake(140, i * 40 +35, 100, 30)];
label2.text = [array2 objectAtIndex:i];
[self.view addSubview:label2];
[label release];
[label2 release];
}
NSString *document = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)objectAtIndex:0];
NSString *path = [document stringByAppendingPathComponent:@"USER.sqlite"];
self.dbpath = path;

UIBarButtonItem *deleteButton = [[UIBarButtonItem alloc]initWithTitle:@"删除" style:UIBarButtonItemStyleDone target:self action:@selector(deleteFromDatabase)];
self.navigationItem.rightBarButtonItem = deleteButton;

}

- (void)deleteFromDatabase//从数据库删除信息
{
FMDatabase *db = [FMDatabase databaseWithPath:self.dbpath];
NSString *mes = nil;
if ([db open]) {
NSString *sql = @"DELETE FROM USER WHERE name = ? and phone = ? and idcode = ?";
if (self.nameStr.length != 0&&self.phoneStr.length != 0&&self.IDsStr.length !=0){
BOOL rs = [db executeUpdate:sql,self.nameStr,self.phoneStr,self.IDsStr]; //后面跟的三个参数就是sql语句里的三个问号对应
if (rs) {
mes = @"删除成功";
}else{
mes = @"删除失败";
}
}
}
UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"提示" message:mes delegate:nil cancelButtonTitle:@"确定" otherButtonTitles:nil, nil];
alert.delegate = self;//别忘了代理
[alert show];
[alert release];
[db close];
}

- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{
if ( buttonIndex == 0) {

[self.navigationController popViewControllerAnimated:YES];
NSLog(@"点击了删除成功");
}
}

- (void)viewWillDisappear:(BOOL)animated
{
[super viewWillDisappear:YES];

}

- (void)viewDidUnload
{
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
// Return YES for supported orientations
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}

@end

完全的代码流，把代码复制过去就直接能用，不过建议大家在复制之前一定要搞清楚写法，最好自己再写一遍，不然复制了下次还是不会。有什么问题记得给我留言。