Sqlite是ios上最常用的数据库之一，大家还是有必要了解一下的。实现效果如图：
先来看看数据库方法类，将各个操作都封装在一个类里面，达到代码重用的目的，这是程序员都应该努力去实现的目标，这样在下一次用到同样的方法和类的时候，就可以直接使用封装好的类，可以节约大量的时间。
先来看看.h文件
<span style="font-family:FangSong_GB2312;font-size:14px;">#import <Foundation/Foundation.h>
#import <sqlite3.h>
#define kFilename @"testdb.db"
@class sqlTestList;
@interface sqlService : NSObject {
sqlite3 *_database;
}
@property (nonatomic) sqlite3 *_database;
-(BOOL) createTestList:(sqlite3 *)db;//创建数据库
-(BOOL) insertTestList:(sqlTestList *)insertList;//插入数据
-(BOOL) updateTestList:(sqlTestList *)updateList;//更新数据
-(NSMutableArray*)getTestList;//获取全部数据
- (BOOL) deleteTestList:(sqlTestList *)deletList;//删除数据：
- (NSMutableArray*)searchTestList:(NSString*)searchString;//查询数据库，searchID为要查询数据的ID，返回数据为查询到的数据
@end
@interface sqlTestList : NSObject//重新定义了一个类，专门用于存储数据
{
int sqlID;
NSString *sqlText;
NSString *sqlname;
}
@property (nonatomic) int sqlID;
@property (nonatomic, retain) NSString *sqlText;
@property (nonatomic, retain) NSString *sqlname;
@end</span><span style="font-family:FangSong_GB2312;font-size:14px;">//
// 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];
}
//获取document目录并返回数据库目录
- (NSString *)dataFilePath{
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSLog(@"=======%@",documentsDirectory);
return [documentsDirectory stringByAppendingPathComponent:@"data.db"];//这里很神奇，可以定义成任何类型的文件，也可以不定义成.db文件，任何格式都行，定义成.sb文件都行，达到了很好的数据隐秘性
}
//创建，打开数据库
- (BOOL)openDB {
//获取数据库路径
NSString *path = [self dataFilePath];
//文件管理器
NSFileManager *fileManager = [NSFileManager defaultManager];
//判断数据库是否存在
BOOL find = [fileManager fileExistsAtPath:path];
//如果数据库存在，则用sqlite3_open直接打开（不要担心，如果数据库不存在sqlite3_open会自动创建）
if (find) {
NSLog(@"Database file have already existed.");
//打开数据库，这里的[path UTF8String]是将NSString转换为C字符串，因为SQLite3是采用可移植的C(而不是
//Objective-C)编写的，它不知道什么是NSString.
if(sqlite3_open([path UTF8String], &_database) != SQLITE_OK) {
//如果打开数据库失败则关闭数据库
sqlite3_close(self._database);
NSLog(@"Error: open database file.");
return NO;
}
//创建一个新表
[self createTestList:self._database];
return YES;
}
//如果发现数据库不存在则利用sqlite3_open创建数据库（上面已经提到过），与上面相同，路径要转换为C字符串
if(sqlite3_open([path UTF8String], &_database) == SQLITE_OK) {
//创建一个新表
[self createTestList:self._database];
return YES;
} else {
//如果创建并打开数据库失败则关闭数据库
sqlite3_close(self._database);
NSLog(@"Error: open database file.");
return NO;
}
return NO;
}
//创建表
- (BOOL) createTestList:(sqlite3*)db {
//这句是大家熟悉的SQL语句
char *sql = "create table if not exists testTable(ID INTEGER PRIMARY KEY AUTOINCREMENT, testID int,testValue text,testName text)";// testID是列名，int 是数据类型，testValue是列名，text是数据类型，是字符串类型
sqlite3_stmt *statement;
//sqlite3_prepare_v2 接口把一条SQL语句解析到statement结构里去. 使用该接口访问数据库是当前比较好的的一种方法
NSInteger sqlReturn = sqlite3_prepare_v2(_database, sql, -1, &statement, nil);
//第一个参数跟前面一样，是个sqlite3 * 类型变量，
//第二个参数是一个 sql 语句。
//第三个参数我写的是-1，这个参数含义是前面 sql 语句的长度。如果小于0，sqlite会自动计算它的长度（把sql语句当成以\0结尾的字符串）。
//第四个参数是sqlite3_stmt 的指针的指针。解析以后的sql语句就放在这个结构里。
//第五个参数是错误信息提示，一般不用,为nil就可以了。
//如果这个函数执行成功（返回值是 SQLITE_OK 且 statement 不为NULL ），那么下面就可以开始插入二进制数据。
//如果SQL语句解析出错的话程序返回
if(sqlReturn != SQLITE_OK) {
NSLog(@"Error: failed to prepare statement:create test table");
return NO;
}
//执行SQL语句
int success = sqlite3_step(statement);
//释放sqlite3_stmt
sqlite3_finalize(statement);
//执行SQL语句失败
if ( success != SQLITE_DONE) {
NSLog(@"Error: failed to dehydrate:create table test");
return NO;
}
NSLog(@"Create table 'testTable' successed.");
return YES;
}
//插入数据
-(BOOL) insertTestList:(sqlTestList *)insertList {
//先判断数据库是否打开
if ([self openDB]) {
sqlite3_stmt *statement;
//这个 sql 语句特别之处在于 values 里面有个? 号。在sqlite3_prepare函数里，?号表示一个未定的值，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;
}
//这里的数字1，2，3代表上面的第几个问号，这里将三个值绑定到三个绑定变量
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);
//执行插入语句
success2 = sqlite3_step(statement);
//释放statement
sqlite3_finalize(statement);
//如果插入失败
if (success2 == SQLITE_ERROR) {
NSLog(@"Error: failed to insert into the database with message.");
//关闭数据库
sqlite3_close(_database);
return NO;
}
//关闭数据库
sqlite3_close(_database);
return YES;
}
return NO;
}
//获取数据
- (NSMutableArray*)getTestList{
NSMutableArray *array = [NSMutableArray arrayWithCapacity:10];
//判断数据库是否打开
if ([self openDB]) {
sqlite3_stmt *statement = nil;
//sql语句
char *sql = "SELECT testID, testValue ,testName FROM testTable";//从testTable这个表中获取 testID, testValue ,testName，若获取全部的话可以用*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 {
//查询结果集中一条一条的遍历所有的记录，这里的数字对应的是列值,注意这里的列值，跟上面sqlite3_bind_text绑定的列值不一样！一定要分开，不然会crash，只有这一处的列号不同，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];//定义了自动释放的NSArray，这样不是个好办法，会造成内存泄露，建议大家定义局部的数组，再赋给属性变量。
}
//更新数据
-(BOOL) updateTestList:(sqlTestList *)updateList{
if ([self openDB]) {
sqlite3_stmt *statement;//这相当一个容器，放转化OK的sql语句
//组织SQL语句
char *sql = "update testTable set testValue = ? and testName = ? WHERE testID = ?";
//将SQL语句放入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;
}
//这里的数字1，2，3代表第几个问号。这里只有1个问号，这是一个相对比较简单的数据库操作，真正的项目中会远远比这个复杂
//绑定text类型的数据库数据
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);
//执行SQL语句。这里是更新数据库
success = sqlite3_step(statement);
//释放statement
sqlite3_finalize(statement);
//如果执行失败
if (success == SQLITE_ERROR) {
NSLog(@"Error: failed to update the database with message.");
//关闭数据库
sqlite3_close(_database);
return NO;
}
//执行成功后依然要关闭数据库
sqlite3_close(_database);
return YES;
}
return NO;
}
//删除数据
- (BOOL) deleteTestList:(sqlTestList *)deletList{
if ([self openDB]) {
sqlite3_stmt *statement;
//组织SQL语句
static char *sql = "delete from testTable where testID = ? and testValue = ? and testName = ?";
//将SQL语句放入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;
}
//这里的数字1，2，3代表第几个问号。这里只有1个问号，这是一个相对比较简单的数据库操作，真正的项目中会远远比这个复杂
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);
//执行SQL语句。这里是更新数据库
success = sqlite3_step(statement);
//释放statement
sqlite3_finalize(statement);
//如果执行失败
if (success == SQLITE_ERROR) {
NSLog(@"Error: failed to delete the database with message.");
//关闭数据库
sqlite3_close(_database);
return NO;
}
//执行成功后依然要关闭数据库
sqlite3_close(_database);
return YES;
}
return NO;
}
//查询数据
- (NSMutableArray*)searchTestList:(NSString*)searchString{
NSMutableArray *array = [NSMutableArray arrayWithCapacity:10];
//判断数据库是否打开
if ([self openDB]) {
sqlite3_stmt *statement = nil;
//sql语句
NSString *querySQL = [NSString stringWithFormat:@"SELECT * from testTable where testName like \"%@\"",searchString];
const char *sql = [querySQL UTF8String];
// char *sql = "SELECT * FROM testTable WHERE testName like ?";//这里用like代替=可以执行模糊查找，原来是"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);
//查询结果集中一条一条的遍历所有的记录，这里的数字对应的是列值。
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//刚才.h文件里定义的类在这实现
@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</span>这就是封装好的类，可以重用哦！
下面是添加数据页面
来看.h文件
<span style="font-family:FangSong_GB2312;font-size:14px;">#import <UIKit/UIKit.h>
#import "sqlService.h"
@interface operateSqlViewController : UIViewController {
UITextField *idValue;
UITextField *textValue;
UITextField *textName;
int oprateType;//区分数据插入与更新
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</span><span style="font-family:FangSong_GB2312;font-size:14px;">#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:@"数据插入"];
}
else if(oprateType == 1){
[self.navigationItem setTitle:@"数据更新"];
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:@"请输入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:@"请输入电话"
delegate:self
cancelButtonTitle:@"好"
otherButtonTitles:nil];
[alert show];
[alert release];
return;
}
if (textName.text.length == 0) {
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"提示"
message:@"请输入姓名"
delegate:self
cancelButtonTitle:@"好"
otherButtonTitles:nil];
[alert show];
[alert release];
return;
}
//初始化数据库
sqlService *sqlSer = [[sqlService alloc] init];
//数据库插入
if (oprateType == 0) {
sqlTestList *sqlInsert = [[sqlTestList alloc]init];
sqlInsert.sqlID = [idValue.text intValue];
sqlInsert.sqlText = textValue.text;
sqlInsert.sqlname = textName.text;
//调用封装好的数据库插入函数
if ([sqlSer insertTestList:sqlInsert]) {
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"提示"
message:@"插入数据成功"
delegate:self
cancelButtonTitle:@"好"
otherButtonTitles:nil];
[alert show];
[alert release];
}
else {
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"提示"
message:@"插入数据失败"
delegate:self
cancelButtonTitle:@"好"
otherButtonTitles:nil];
[alert show];
[alert release];
}
[sqlInsert release];
}
//数据库更新
if(oprateType == 1){
sqlTestList *newValue = [[sqlTestList alloc]init];
newValue.sqlID = [idValue.text intValue];
newValue.sqlText = textValue.text;
newValue.sqlname = textName.text;
//调用封装好的更新数据库函数
if ([sqlSer updateTestList:newValue]) {
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"提示"
message:@"更新数据成功"
delegate:self
cancelButtonTitle:@"好"
otherButtonTitles:nil];
[alert show];
[alert release];
}
else {
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"提示"
message:@"更新数据失败"
delegate:self
cancelButtonTitle:@"好"
otherButtonTitles:nil];
[alert show];
[alert release];
}
[newValue release];
}
}
@end</span>代码写的有些啰嗦，不过不难容易看懂，不多解释了，要在xib文件中添加3个UITextField和ULabel，要记得连线。
在主界面的.h文件
<span style="font-family:FangSong_GB2312;font-size:14px;">#import <UIKit/UIKit.h>
#import "sqlService.h"
@interface SQLite3TestViewController : UIViewController<UITableViewDelegate,UITableViewDataSource> {
UITableView *utableView;
NSArray *listData;
UISearchBar *searchBar;//搜索栏
}
@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</span><span style="font-family:FangSong_GB2312;font-size:14px;">//
// 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];//先初始化那个专门用于存数据的类，才调用类获取数据的方法
}
- (void)viewDidAppear:(BOOL)animated{//在这里写是为了等待时间缩短一点，数据如果很多的，在这里写可以让数据提前加载
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];//触发这个insertValue方法时隐藏键盘
operateSqlViewController *operateController = [[operateSqlViewController alloc] init ];
UINavigationController *theNavController = [[UINavigationController alloc]
initWithRootViewController:operateController];//这里如果不初始化一个UINavigationController类的对象来存放operateSqlViewController类的UIViewController，就不会有最上面的导航栏了。
operateController.oprateType = 0;//optrateType为0时为数据插入
[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:@"请选择要更新的项"
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)];//在这里面获取点击的行，因为table的第一行没显示数据，所以这里要减1。
operateSqlViewController *operateController = [[operateSqlViewController alloc] init ];
UINavigationController *theNavController = [[UINavigationController alloc]
initWithRootViewController:operateController];
operateController.oprateType = 1;//optrateType为1时为数据更新
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:@"请选择要删除的项"
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:@"删除数据成功"
delegate:self
cancelButtonTitle:@"好"
otherButtonTitles:nil];
[alert show];
[alert release];
//删除成功后重新获取数据更新列表
listData = [sqlSer getTestList];
[utableView reloadData];
}
else {
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"提示"
message:@"删除数据失败"
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:@"请输入要查询数据的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,未查询到数据，请查看name是否有误"
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;//从第二行开始，第一行不显示数据
}
- (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)];//读取数据的时候也要减一行，从第二行开始
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",@"电话", 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;//让第一行不能点击
}
else
return indexPath;
}
@end//
// 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];//先初始化那个专门用于存数据的类，才调用类获取数据的方法
}
- (void)viewDidAppear:(BOOL)animated{//在这里写是为了等待时间缩短一点，数据如果很多的，在这里写可以让数据提前加载
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];//触发这个insertValue方法时隐藏键盘
operateSqlViewController *operateController = [[operateSqlViewController alloc] init ];
UINavigationController *theNavController = [[UINavigationController alloc]
initWithRootViewController:operateController];//这里如果不初始化一个UINavigationController类的对象来存放operateSqlViewController类的UIViewController，就不会有最上面的导航栏了。
operateController.oprateType = 0;//optrateType为0时为数据插入
[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:@"请选择要更新的项"
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)];//在这里面获取点击的行，因为table的第一行没显示数据，所以这里要减1。
operateSqlViewController *operateController = [[operateSqlViewController alloc] init ];
UINavigationController *theNavController = [[UINavigationController alloc]
initWithRootViewController:operateController];
operateController.oprateType = 1;//optrateType为1时为数据更新
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:@"请选择要删除的项"
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:@"删除数据成功"
delegate:self
cancelButtonTitle:@"好"
otherButtonTitles:nil];
[alert show];
[alert release];
//删除成功后重新获取数据更新列表
listData = [sqlSer getTestList];
[utableView reloadData];
}
else {
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"提示"
message:@"删除数据失败"
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:@"请输入要查询数据的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,未查询到数据，请查看name是否有误"
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;//从第二行开始，第一行不显示数据
}
- (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)];//读取数据的时候也要减一行，从第二行开始
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",@"电话", 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;//让第一行不能点击
}
else
return indexPath;
}
@end</span>