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。