研究了幾天的數據庫，終於把它給搞出來了。Sqlite是ios上最常用的數據庫之一，大家還是有必要了解一下的。這是仿照網上的一個例子做的，有些部分寫的不好，我稍作了修改，以講解為主，主要讓大家能夠明白如何修改，明白原理，達到舉一反三的目的。

先來看看效果圖

　　先來看看數據庫方法類，將各個操作都封裝在一個類裡面，達到代碼重用的目的，這是程序員都應該努力去實現的目標，這樣在下一次用到同樣的方法和類的時候，就可以直接使用封裝好的類，可以節約大量的時間。

先來看看.h文件

#import 
#import 

#define kFilename  @"testdb.db"
@class sqlTestList;
@interface sqlService : NSObject {
    sqlite3 *_database;

}

@property (nonatomic) sqlite3 *_database;
-(BOOL) createTestList:(sqlite3 *)db;//創建數據庫
-(BOOL) insertTestList:(sqlTestList *)insertList;//插入數據                                                
-(BOOL) updateTestList:(sqlTestList *)updateList;//更新數據
-(NSMutableArray*)getTestList;//獲取全部數據
- (BOOL) deleteTestList:(sqlTestList *)deletList;//刪除數據：
- (NSMutableArray*)searchTestList:(NSString*)searchString;//查詢數據庫，searchID為要查詢數據的ID，返回數據為查詢到的數據
@end

@interface sqlTestList : NSObject//重新定義了一個類，專門用於存儲數據
{
    int sqlID;
    NSString *sqlText;
    NSString *sqlname;
}

@property (nonatomic) int sqlID;
@property (nonatomic, retain) NSString *sqlText;
@property (nonatomic, retain) NSString *sqlname;

@end

再來看看.m文件

//
//  sqlService.m
//  SQLite3Test
//
//  Created by fengxiao on 11-11-28.
//  Copyright 2011 __MyCompanyName__. All rights reserved.
//

#import "sqlService.h"


@implementation sqlService

@synthesize _database;

- (id)init
{
    return self;
}

- (void)dealloc
{
    [super dealloc];
}

//獲取document目錄並返回數據庫目錄
- (NSString *)dataFilePath{
    
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    NSLog(@"=======%@",documentsDirectory);
    return [documentsDirectory stringByAppendingPathComponent:@"data.db"];//這裡很神奇，可以定義成任何類型的文件，也可以不定義成.db文件，任何格式都行，定義成.sb文件都行，達到了很好的數據隱秘性
    
}

//創建，打開數據庫
- (BOOL)openDB {
    
    //獲取數據庫路徑
    NSString *path = [self dataFilePath];
    //文件管理器
    NSFileManager *fileManager = [NSFileManager defaultManager];
    //判斷數據庫是否存在
    BOOL find = [fileManager fileExistsAtPath:path];
    
    //如果數據庫存在，則用sqlite3_open直接打開（不要擔心，如果數據庫不存在sqlite3_open會自動創建）
    if (find) {
        
        NSLog(@"Database file have already existed.");
        
        //打開數據庫，這裡的[path UTF8String]是將NSString轉換為C字符串，因為SQLite3是采用可移植的C(而不是
        //Objective-C)編寫的，它不知道什麼是NSString.
        if(sqlite3_open([path UTF8String], &_database) != SQLITE_OK) {
            
            //如果打開數據庫失敗則關閉數據庫
            sqlite3_close(self._database);
            NSLog(@"Error: open database file.");
            return NO;
        }
        
        //創建一個新表
        [self createTestList:self._database];
        
        return YES;
    }
    //如果發現數據庫不存在則利用sqlite3_open創建數據庫（上面已經提到過），與上面相同，路徑要轉換為C字符串
    if(sqlite3_open([path UTF8String], &_database) == SQLITE_OK) {
        
        //創建一個新表
        [self createTestList:self._database];
        return YES;
    } else {
        //如果創建並打開數據庫失敗則關閉數據庫
        sqlite3_close(self._database);
        NSLog(@"Error: open database file.");
        return NO;
    }
    return NO;
}

//創建表
- (BOOL) createTestList:(sqlite3*)db {
    
    //這句是大家熟悉的SQL語句
    char *sql = "create table if not exists testTable(ID INTEGER PRIMARY KEY AUTOINCREMENT, testID int,testValue text,testName text)";// testID是列名，int 是數據類型，testValue是列名，text是數據類型，是字符串類型
    
    sqlite3_stmt *statement;
    //sqlite3_prepare_v2 接口把一條SQL語句解析到statement結構裡去. 使用該接口訪問數據庫是當前比較好的的一種方法
    NSInteger sqlReturn = sqlite3_prepare_v2(_database, sql, -1, &statement, nil);
    //第一個參數跟前面一樣，是個sqlite3 * 類型變量，
    //第二個參數是一個 sql 語句。
    //第三個參數我寫的是-1，這個參數含義是前面 sql 語句的長度。如果小於0，sqlite會自動計算它的長度（把sql語句當成以\0結尾的字符串）。
    //第四個參數是sqlite3_stmt 的指針的指針。解析以後的sql語句就放在這個結構裡。
    //第五個參數是錯誤信息提示，一般不用,為nil就可以了。
    //如果這個函數執行成功（返回值是 SQLITE_OK 且 statement 不為NULL ），那麼下面就可以開始插入二進制數據。
    
    
    //如果SQL語句解析出錯的話程序返回
    if(sqlReturn != SQLITE_OK) {
        NSLog(@"Error: failed to prepare statement:create test table");
        return NO;
    }
    
    //執行SQL語句
    int success = sqlite3_step(statement);
    //釋放sqlite3_stmt 
    sqlite3_finalize(statement);
    
    //執行SQL語句失敗
    if ( success != SQLITE_DONE) {
        NSLog(@"Error: failed to dehydrate:create table test");
        return NO;
    }
    NSLog(@"Create table 'testTable' successed.");
    return YES;
}

//插入數據
-(BOOL) insertTestList:(sqlTestList *)insertList {
    
    //先判斷數據庫是否打開
    if ([self openDB]) {
        
        sqlite3_stmt *statement;
        
        //這個 sql 語句特別之處在於 values 裡面有個? 號。在sqlite3_prepare函數裡，?號表示一個未定的值，它的值等下才插入。
        static char *sql = "INSERT INTO testTable(testID, testValue,testName) VALUES(?, ?, ?)";
        
        int success2 = sqlite3_prepare_v2(_database, sql, -1, &statement, NULL);
        if (success2 != SQLITE_OK) {
            NSLog(@"Error: failed to insert:testTable");
            sqlite3_close(_database);
            return NO;
        }
        
        //這裡的數字1，2，3代表上面的第幾個問號，這裡將三個值綁定到三個綁定變量
        sqlite3_bind_int(statement, 1, insertList.sqlID);
        sqlite3_bind_text(statement, 2, [insertList.sqlText UTF8String], -1, SQLITE_TRANSIENT);
        sqlite3_bind_text(statement, 3, [insertList.sqlname UTF8String], -1, SQLITE_TRANSIENT);

        //執行插入語句
        success2 = sqlite3_step(statement);
        //釋放statement
        sqlite3_finalize(statement);
        
        //如果插入失敗
        if (success2 == SQLITE_ERROR) {
            NSLog(@"Error: failed to insert into the database with message.");
            //關閉數據庫
            sqlite3_close(_database);
            return NO;
        }
        //關閉數據庫
        sqlite3_close(_database);
        return YES;
    }
    return NO;
}

//獲取數據
- (NSMutableArray*)getTestList{
    
    NSMutableArray *array = [NSMutableArray arrayWithCapacity:10];
    //判斷數據庫是否打開
    if ([self openDB]) {
        
        sqlite3_stmt *statement = nil;
        //sql語句
        char *sql = "SELECT testID, testValue ,testName FROM testTable";//從testTable這個表中獲取 testID, testValue ,testName，若獲取全部的話可以用*代替testID, testValue ,testName。
        
        if (sqlite3_prepare_v2(_database, sql, -1, &statement, NULL) != SQLITE_OK) {
            NSLog(@"Error: failed to prepare statement with message:get testValue.");
            return NO;
        }
        else {
            //查詢結果集中一條一條的遍歷所有的記錄，這裡的數字對應的是列值,注意這裡的列值，跟上面sqlite3_bind_text綁定的列值不一樣！一定要分開，不然會crash，只有這一處的列號不同，注意！
            while (sqlite3_step(statement) == SQLITE_ROW) {
                sqlTestList* sqlList = [[sqlTestList alloc] init] ;
                sqlList.sqlID    = sqlite3_column_int(statement,0);
                char* strText   = (char*)sqlite3_column_text(statement, 1);
                sqlList.sqlText = [NSString stringWithUTF8String:strText];
                char *strName = (char*)sqlite3_column_text(statement, 2);
                sqlList.sqlname = [NSString stringWithUTF8String:strName];
                [array addObject:sqlList];
                [sqlList release];
            }
        }
        sqlite3_finalize(statement);
        sqlite3_close(_database);
    }
    
    return [array retain];//定義了自動釋放的NSArray，這樣不是個好辦法，會造成內存洩露，建議大家定義局部的數組，再賦給屬性變量。
}

//更新數據
-(BOOL) updateTestList:(sqlTestList *)updateList{
    
    if ([self openDB]) {
        sqlite3_stmt *statement;//這相當一個容器，放轉化OK的sql語句
        //組織SQL語句
        char *sql = "update testTable set testValue = ? and testName = ? WHERE testID = ?";
        
        //將SQL語句放入sqlite3_stmt中
        int success = sqlite3_prepare_v2(_database, sql, -1, &statement, NULL);
        if (success != SQLITE_OK) {
            NSLog(@"Error: failed to update:testTable");
            sqlite3_close(_database);
            return NO;
        }
        
        //這裡的數字1，2，3代表第幾個問號。這裡只有1個問號，這是一個相對比較簡單的數據庫操作，真正的項目中會遠遠比這個復雜
        //綁定text類型的數據庫數據
        sqlite3_bind_text(statement, 3, [updateList.sqlname UTF8String], -1, SQLITE_TRANSIENT);
        sqlite3_bind_text(statement, 2, [updateList.sqlText UTF8String], -1, SQLITE_TRANSIENT);
        sqlite3_bind_int(statement, 1, updateList.sqlID);
        
        //執行SQL語句。這裡是更新數據庫
        success = sqlite3_step(statement);
        //釋放statement
        sqlite3_finalize(statement);
        
        //如果執行失敗
        if (success == SQLITE_ERROR) {
            NSLog(@"Error: failed to update the database with message.");
            //關閉數據庫
            sqlite3_close(_database);
            return NO;
        }
        //執行成功後依然要關閉數據庫
        sqlite3_close(_database);
        return YES;
    }
    return NO;
}
//刪除數據
- (BOOL) deleteTestList:(sqlTestList *)deletList{
    if ([self openDB]) {
        
        sqlite3_stmt *statement;
        //組織SQL語句
        static char *sql = "delete from testTable  where testID = ? and testValue = ? and testName = ?";
        //將SQL語句放入sqlite3_stmt中
        int success = sqlite3_prepare_v2(_database, sql, -1, &statement, NULL);
        if (success != SQLITE_OK) {
            NSLog(@"Error: failed to delete:testTable");
            sqlite3_close(_database);
            return NO;
        }
        
        //這裡的數字1，2，3代表第幾個問號。這裡只有1個問號，這是一個相對比較簡單的數據庫操作，真正的項目中會遠遠比這個復雜
        sqlite3_bind_int(statement, 1, deletList.sqlID);
        sqlite3_bind_text(statement, 2, [deletList.sqlText UTF8String], -1, SQLITE_TRANSIENT);
        sqlite3_bind_text(statement, 3, [deletList.sqlname UTF8String], -1, SQLITE_TRANSIENT);
        //執行SQL語句。這裡是更新數據庫
        success = sqlite3_step(statement);
        //釋放statement
        sqlite3_finalize(statement);
        
        //如果執行失敗
        if (success == SQLITE_ERROR) {
            NSLog(@"Error: failed to delete the database with message.");
            //關閉數據庫
            sqlite3_close(_database);
            return NO;
        }
        //執行成功後依然要關閉數據庫
        sqlite3_close(_database);
        return YES;
    }
    return NO;
    
}
//查詢數據
- (NSMutableArray*)searchTestList:(NSString*)searchString{
    
    NSMutableArray *array = [NSMutableArray arrayWithCapacity:10];
    //判斷數據庫是否打開
    if ([self openDB]) {
        
        sqlite3_stmt *statement = nil;
        //sql語句
        NSString *querySQL = [NSString stringWithFormat:@"SELECT * from testTable where testName like \"%@\"",searchString];
        const char *sql = [querySQL UTF8String];
//        char *sql = "SELECT * FROM testTable WHERE testName like ?";//這裡用like代替=可以執行模糊查找，原來是"SELECT * FROM testTable WHERE testName = ?"
        if (sqlite3_prepare_v2(_database, sql, -1, &statement, NULL) != SQLITE_OK) {
            NSLog(@"Error: failed to prepare statement with message:search testValue.");
            return NO;
        } else {
            sqlTestList *searchList = [[sqlTestList alloc]init];
//            sqlite3_bind_int(statement, 1, searchID);
            sqlite3_bind_text(statement, 3, [searchString UTF8String], -1, SQLITE_TRANSIENT);
            //查詢結果集中一條一條的遍歷所有的記錄，這裡的數字對應的是列值。
            while (sqlite3_step(statement) == SQLITE_ROW) {
                sqlTestList* sqlList = [[sqlTestList alloc] init] ;
                sqlList.sqlID   = sqlite3_column_int(statement,1);
                char* strText   = (char*)sqlite3_column_text(statement, 2);
                sqlList.sqlText = [NSString stringWithUTF8String:strText];
                char *strName = (char*)sqlite3_column_text(statement, 3);
                sqlList.sqlname = [NSString stringWithUTF8String:strName];
                [array addObject:sqlList];
                [sqlList release];
            }
            [searchList release];                
        }
        sqlite3_finalize(statement);
        sqlite3_close(_database);
    }
    
    return [array retain];
}

@end


@implementation sqlTestList//剛才.h文件裡定義的類在這實現

@synthesize sqlID;
@synthesize sqlText;
@synthesize sqlname;
-(id) init
{
    sqlID = 0;
    sqlText = @"";
    sqlname = @"";
    return self;
};
-(void) dealloc
{
    if ((sqlText != nil) && (sqlname != nil)) {
        [sqlText release];
        [sqlname release];
    }

    [super dealloc];
}

@end

這就是封裝好的類，可以重用哦！

下面是添加數據頁面

這也是一個類，來看.h文件

#import 
#import "sqlService.h"

@interface operateSqlViewController : UIViewController {
    
    UITextField *idValue;
    UITextField *textValue;
    UITextField *textName;
    int oprateType;//區分數據插入與更新
    sqlTestList *sqlValue;
}

@property (nonatomic, retain) IBOutlet UITextField *idValue;
@property (nonatomic, retain) IBOutlet UITextField *textValue;
@property (nonatomic, retain) IBOutlet UITextField *textName;
@property (nonatomic, retain) sqlTestList *sqlValue;
@property (nonatomic) int oprateType;

@end

再來看看.m文件

#import "operateSqlViewController.h"


@implementation operateSqlViewController
@synthesize idValue;
@synthesize textValue;
@synthesize oprateType;
@synthesize sqlValue;
@synthesize textName;
- (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.
}

- (void)viewDidLoad{
    
    UIBarButtonItem *backButton = [[UIBarButtonItem alloc]
                                   initWithTitle:@"返回"
                                   style:UIBarButtonItemStyleBordered
                                   target:self
                                   action:@selector(dismiss:)];
    
    UIBarButtonItem *saveButton = [[UIBarButtonItem alloc]
                                   initWithTitle:@"保存"
                                   style:UIBarButtonItemStyleBordered
                                   target:self
                                   action:@selector(saveValue:)];
    [[self navigationItem] setLeftBarButtonItem:backButton];
    [[self navigationItem] setRightBarButtonItem:saveButton];
    
    [backButton release];
    [saveButton release];
    
    if (oprateType == 0) {
        [self.navigationItem setTitle:@"數據插入"];
    }
    else if(oprateType == 1){
        [self.navigationItem setTitle:@"數據更新"];
        idValue.text = [NSString stringWithFormat:@"%d", sqlValue.sqlID];
        textValue.text = sqlValue.sqlText;
        textName.text = sqlValue.sqlname;
    }
}

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


- (void)dealloc {
    [idValue release];
    [textValue release];
    [sqlValue release];
    [textName release];
    [super dealloc];
}

- (void)dismiss:(id)sender{
    [[self parentViewController] dismissModalViewControllerAnimated:YES];
}
- (void)saveValue:(id)sender{
    
    
    if (idValue.text.length == 0) {
            UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"提示" 
                                                            message:@"請輸入ID" 
                                                           delegate:self
                                                  cancelButtonTitle:@"好" 
                                                  otherButtonTitles:nil];
            [alert show];
            [alert release];
        return;
    }
    if (textValue.text.length == 0) {
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"提示" 
                                                        message:@"請輸入電話" 
                                                       delegate:self
                                              cancelButtonTitle:@"好" 
                                              otherButtonTitles:nil];
        [alert show];
        [alert release];
        return;
    }
    if (textName.text.length == 0) {
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"提示" 
                                                        message:@"請輸入姓名" 
                                                       delegate:self
                                              cancelButtonTitle:@"好" 
                                              otherButtonTitles:nil];
        [alert show];
        [alert release];
        return;
    }

    
    
    //初始化數據庫
    sqlService *sqlSer = [[sqlService alloc] init];
    
    //數據庫插入
    if (oprateType == 0) {
        
        sqlTestList *sqlInsert = [[sqlTestList alloc]init];
        sqlInsert.sqlID = [idValue.text intValue];
        sqlInsert.sqlText = textValue.text;
        sqlInsert.sqlname = textName.text;
        
        //調用封裝好的數據庫插入函數
        if ([sqlSer insertTestList:sqlInsert]) {
            UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"提示" 
                                                            message:@"插入數據成功" 
                                                           delegate:self
                                                  cancelButtonTitle:@"好" 
                                                  otherButtonTitles:nil];
            [alert show];
            [alert release];
        }
        else {
            UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"提示" 
                                                            message:@"插入數據失敗" 
                                                           delegate:self
                                                  cancelButtonTitle:@"好" 
                                                  otherButtonTitles:nil];
            [alert show];
            [alert release];
            
        }
        [sqlInsert release];

    }
    //數據庫更新
    if(oprateType == 1){
        
        sqlTestList *newValue = [[sqlTestList alloc]init];
        newValue.sqlID = [idValue.text intValue];
        newValue.sqlText = textValue.text;
        newValue.sqlname = textName.text;
        
        //調用封裝好的更新數據庫函數
        if ([sqlSer updateTestList:newValue]) {
            UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"提示" 
                                                            message:@"更新數據成功" 
                                                           delegate:self
                                                  cancelButtonTitle:@"好" 
                                                  otherButtonTitles:nil];
            [alert show];
            [alert release];
        }
        else {
            UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"提示" 
                                                            message:@"更新數據失敗" 
                                                           delegate:self
                                                  cancelButtonTitle:@"好" 
                                                  otherButtonTitles:nil];
            [alert show];
            [alert release];
            
        }
        
        [newValue release];
    }

}

@end

代碼寫的有些啰嗦，不過不難容易看懂，不多解釋了，要在xib文件中添加3個UITextField和ULabel，要記得連線。

在主界面的.h文件

#import 
#import "sqlService.h"
@interface SQLite3TestViewController : UIViewController {

    UITableView *utableView;
    NSArray *listData;
    UISearchBar *searchBar;//搜索欄
    
}

@property (nonatomic, retain) IBOutlet UITableView *utableView;
@property (nonatomic, retain) IBOutlet UISearchBar *searchBar;
@property (nonatomic, retain) NSArray *listData;

- (IBAction)insertValue;
- (IBAction)updateValue;
- (IBAction)getAllValue;
- (IBAction)deleteValue;
- (IBAction)searchValue;


@end

 

.m文件

//
//  SQLite3TestViewController.m
//  SQLite3Test
//
//  Created by fengxiao on 11-11-28.
//  Copyright 2011 __MyCompanyName__. All rights reserved.
//

#import "SQLite3TestViewController.h"
#import "operateSqlViewController.h"

@implementation SQLite3TestViewController
@synthesize utableView;
@synthesize listData;
@synthesize searchBar;


- (void)viewDidLoad{
    sqlService *sqlSer = [[sqlService alloc] init];
    listData = [sqlSer getTestList];//先初始化那個專門用於存數據的類，才調用類獲取數據的方法
}

- (void)viewDidAppear:(BOOL)animated{//在這裡寫是為了等待時間縮短一點，數據如果很多的，在這裡寫可以讓數據提前加載
    sqlService *sqlSer = [[sqlService alloc] init];
    listData = [sqlSer getTestList];
    [sqlSer release];
    [utableView reloadData];
}

- (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.
}

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


- (void)dealloc {
    [utableView release];
    [listData release];
    [searchBar release];
    [super dealloc];
}


- (IBAction)insertValue{
    
    [searchBar resignFirstResponder];//觸發這個insertValue方法時隱藏鍵盤
    operateSqlViewController *operateController = [[operateSqlViewController alloc] init ];
    UINavigationController *theNavController = [[UINavigationController alloc]
                                                initWithRootViewController:operateController];//這裡如果不初始化一個UINavigationController類的對象來存放operateSqlViewController類的UIViewController，就不會有最上面的導航欄了。
    operateController.oprateType = 0;//optrateType為0時為數據插入
    [operateController release];
    theNavController.navigationBar.tintColor = [UIColor blackColor];
    [self presentModalViewController:theNavController animated:YES];
    [theNavController release];
}

- (IBAction)updateValue{
    
    [searchBar resignFirstResponder];
    NSIndexPath *indexPath = [utableView  indexPathForSelectedRow];    
    if (indexPath == nil) {
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"提示" 
                                                        message:@"請選擇要更新的項" 
                                                       delegate:self
                                              cancelButtonTitle:@"好" 
                                              otherButtonTitles:nil];
        [alert show];
        [alert release];
        return;
    }
    
    NSUInteger row = [indexPath row];
    sqlTestList *sqlList = [[sqlTestList alloc]init];
    sqlList = [listData objectAtIndex:(row - 1)];//在這裡面獲取點擊的行，因為table的第一行沒顯示數據，所以這裡要減1。
        
    operateSqlViewController *operateController = [[operateSqlViewController alloc] init ];
    UINavigationController *theNavController = [[UINavigationController alloc]
                                                initWithRootViewController:operateController];
    operateController.oprateType = 1;//optrateType為1時為數據更新
    operateController.sqlValue = sqlList;
    theNavController.navigationBar.tintColor = [UIColor blackColor];
    [self presentModalViewController:theNavController animated:YES];
    [sqlList release];
    [operateController release];
    [theNavController release];
}

- (IBAction)getAllValue{
    
    [searchBar resignFirstResponder];
    
    sqlService *sqlSer = [[sqlService alloc] init];
    listData = [sqlSer getTestList];
    [utableView reloadData];
    [sqlSer release];
    
}
- (IBAction)deleteValue{
    
    [searchBar resignFirstResponder];
    
    NSIndexPath *indexPath = [utableView  indexPathForSelectedRow];
    
    if (indexPath == nil) {
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"提示" 
                                                        message:@"請選擇要刪除的項" 
                                                       delegate:self
                                              cancelButtonTitle:@"好" 
                                              otherButtonTitles:nil];
        [alert show];
        [alert release];
        return;
    }
    
    NSUInteger row = [indexPath row];
    sqlTestList *sqlList = [[sqlTestList alloc]init];
    sqlList = [listData objectAtIndex:(row - 1)];
    
    sqlService *sqlSer = [[sqlService alloc] init];
    
     if ([sqlSer deleteTestList:sqlList]) {
         UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"提示" 
                                                         message:@"刪除數據成功" 
                                                        delegate:self
                                               cancelButtonTitle:@"好" 
                                               otherButtonTitles:nil];
         [alert show];
         [alert release];
         
         //刪除成功後重新獲取數據更新列表
         listData = [sqlSer getTestList];
         [utableView reloadData];

     }
    else {
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"提示" 
                                                        message:@"刪除數據失敗" 
                                                       delegate:self
                                              cancelButtonTitle:@"好" 
                                              otherButtonTitles:nil];
        [alert show];
        [alert release];
        return;
    }
    
    [sqlList release];
    [sqlSer release];
}
- (IBAction)searchValue{
    
    if ([searchBar.text isEqualToString:@""]) {
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"提示" 
                                                        message:@"請輸入要查詢數據的ID" 
                                                       delegate:self
                                              cancelButtonTitle:@"好" 
                                              otherButtonTitles:nil];
        [alert show];
        [alert release];
        return;
    }
    else {
//        int idNum = [searchBar.text intValue];
        NSString *str = searchBar.text;
        sqlService *sqlSer = [[sqlService alloc] init];
        listData = [sqlSer searchTestList:str];

        if ([listData  count] == 0) {
            UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"提示" 
                                                            message:@"sorry,未查詢到數據，請查看name是否有誤" 
                                                           delegate:self
                                                  cancelButtonTitle:@"好" 
                                                  otherButtonTitles:nil];
            [alert show];
            [alert release];
            return;
        }
        [searchBar resignFirstResponder];
        [utableView reloadData];
        [sqlSer release];
    
    }
}

#pragma mark -
#pragma mark Table View Data Source Methods
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    // Return the number of rows in the section.
    return [listData count] + 1;//從第二行開始，第一行不顯示數據
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    
    NSString *CustomIdentifier =  [NSString stringWithFormat:@"cell%d",indexPath.row];
    //cell不重用
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CustomIdentifier];
    if (indexPath.row == 0)
    cell.selectionStyle = UITableViewCellSelectionStyleNone;
    if ( cell == nil ) {
        cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleValue1 
                                         reuseIdentifier:CustomIdentifier] autorelease];
        cell.backgroundColor = [UIColor clearColor];
            }
    if (indexPath.row > 0)
    {
        NSUInteger row = [indexPath row];
        sqlTestList *sqlList = [[sqlTestList alloc] init] ;
        
        if (listData != nil)
        sqlList = [listData objectAtIndex: (row - 1)];//讀取數據的時候也要減一行，從第二行開始
        
        UILabel *nameLabel = [[UILabel alloc]initWithFrame:CGRectMake(0+40, 10, 70, 30)];
        UILabel *IDLabel = [[UILabel alloc]initWithFrame:CGRectMake(90+40, 10, 70, 30)];
        UILabel *valueLabel = [[UILabel alloc]initWithFrame:CGRectMake(180+40, 10, 70, 30)];
        nameLabel.text = sqlList.sqlname;
        IDLabel.text = sqlList.sqlText;
        valueLabel.text = [NSString stringWithFormat:@"%d",sqlList.sqlID];
        [cell.contentView addSubview:nameLabel];
        [cell.contentView addSubview:IDLabel];
        [cell.contentView addSubview:valueLabel];
        [nameLabel release];
        [IDLabel release];
        [valueLabel 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",@"ID",@"電話", nil];
            label.text = [array objectAtIndex:i];
            label.backgroundColor = [UIColor clearColor];
            [cell.contentView addSubview:label];
            [label release];
        }
    }
    return cell;
}

- (NSIndexPath*)tableView:(UITableView *)tableView willSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    [searchBar resignFirstResponder];
    if (indexPath.row == 0) {
        return nil;//讓第一行不能點擊
    }
    else
        return indexPath;
}

@end

好了，這就是全部了，希望大家盡量封裝自己寫的類，現在寫得多，以後會很輕松。

有什麼問題請給我留言。