iOS开发之SQLite

在实际工作中用得最多的是FMDB

SQLite
数据类型
NULL
Integer
Real   包括- float-double
Text    字符串
BLOB    二进制

增删改查

创建一个表
creat table strdent(ID integer primary key,name text,phone text,gender text);
creat table(表名)

插入数据
insert into student(name,phone) values('kallen','15101178513')

更新数据
update student set name = 'Alex' where s_id = 1

删除数据
delete from student where s_id = 2

查询分 单表查询和多表查询

查找数据
select 字段1,字段2,… from 表名 where 条件
select name,phone from student where s_id = 1

查找有多少数据
select count(s_id) from student            
起别名
select count(s_id) as count from student
查询某个字有多少个  '%某个字%'
select name from student where name like '%e%'

新建工程,添加SQLite框架. 选择3.0.dylib... 为什么不选另一个这里不讨论

把数据库添加到工程里,,,

详细代码如下

//
//  AppDelegate.h
//  SQlite
//
//  Created by VincentXue on 12-8-24.
//  Copyright (c) 2012年 VincentXue. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface AppDelegate : UIResponder <UIApplicationDelegate>

@property (strong, nonatomic) UIWindow *window;

@end


//
//  AppDelegate.m
//  SQlite
//
//  Created by VincentXue on 12-8-24.
//  Copyright (c) 2012年 VincentXue. All rights reserved.
//

#import "AppDelegate.h"
#import "StuListViewController.h"
@implementation AppDelegate

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

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
    // Override point for customization after application launch.
    StuListViewController *stuViewController = [[StuListViewController alloc] initWithStyle:UITableViewStylePlain];
    self.window.rootViewController = stuViewController;
    [stuViewController release];
    self.window.backgroundColor = [UIColor whiteColor];
    [self.window makeKeyAndVisible];
    return YES;
}

@end


//
//  StuListViewController.h
//  SQlite
//
//  Created by VincentXue on 12-8-24.
//  Copyright (c) 2012年 VincentXue. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface StuListViewController : UITableViewController
{
    NSArray *stuList;
}
@end



//
//  StuListViewController.m
//  SQlite
//
//  Created by VincentXue on 12-8-24.
//  Copyright (c) 2012年 VincentXue. All rights reserved.
//

#import "StuListViewController.h"
#import "student.h"
@interface StuListViewController ()

@end

@implementation StuListViewController

- (id)initWithStyle:(UITableViewStyle)style
{
    self = [super initWithStyle:style];
    if (self) {
        // Custom initialization
        stuList = [Student findAllStu];
        [stuList retain];
        NSLog(@"stuList = %@",stuList);
    }
    return self;
}

- (void)viewDidLoad
{
    [super viewDidLoad];

    // Uncomment the following line to preserve selection between presentations.
    // self.clearsSelectionOnViewWillAppear = NO;
 
    // Uncomment the following line to display an Edit button in the navigation bar for this view controller.
    // self.navigationItem.rightBarButtonItem = self.editButtonItem;
}

- (void)viewDidUnload
{
    [super viewDidUnload];
    // Release any retained subviews of the main view.
    // e.g. self.myOutlet = nil;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    return [stuList count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *CellIndentifier = @"Cell";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIndentifier];
    if (cell == nil) {
        cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIndentifier]autorelease];
    }
    Student *s = [stuList objectAtIndex:indexPath.row];
    cell.textLabel.text = s.name;
    return cell;
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    return (interfaceOrientation == UIInterfaceOrientationPortrait);
}

#pragma mark - Table view data source

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{

    // Return the number of sections.
    return 1;
}



//
//  Student.h
//  SQlite
//
//  Created by VincentXue on 12-8-24.
//  Copyright (c) 2012年 VincentXue. All rights reserved.
//

#import <Foundation/Foundation.h>

@interface Student : NSObject
{
    int _s_id;
    NSString *_name;
    NSString *_phone;
}
@property (assign,nonatomic)NSInteger s_id;
@property (retain,nonatomic)NSString *name;
@property (retain,nonatomic)NSString *phone;

- (id)initWithID:(int)aID Name:(NSString *)aName Phone:(NSString *)aPhone;

+ (NSArray *) findAllStu;
+ (BOOL)deleteFronStudent:(int)aID;
@end


//
//  Student.m
//  SQlite
//
//  Created by VincentXue on 12-8-24.
//  Copyright (c) 2012年 VincentXue. All rights reserved.
//

#import "Student.h"
#include <sqlite3.h>
#import "DBHelper.h"

@implementation Student
@synthesize name = _name;
@synthesize phone = _phone;
@synthesize s_id = _s_id;
- (id)initWithID:(int)aID Name:(NSString *)aName Phone:(NSString *)aPhone
{
    self = [super init];
    if (self) {
        self.s_id = aID;
        self.name = aName;
        self.phone = aPhone;
        
    }
    return self;
}
+ (NSArray *) findAllStu
{
    sqlite3 *db = [DBHelper DBOpen];
    sqlite3_stmt *stmt = nil;   //数据集
    int result;
    result = sqlite3_prepare(db, "select * from student", -1, &stmt, NULL);
    
    if (result == SQLITE_OK)
    {
        NSMutableArray *stuArray = [NSMutableArray array];
        while (sqlite3_step(stmt) == SQLITE_ROW)    //当还有下一行继续执行
        {
            int aID = sqlite3_column_int(stmt, 0);  //提取第1列
            const unsigned char *aName = sqlite3_column_text(stmt, 1);
            const unsigned char *aPhone = sqlite3_column_text(stmt, 2);
            
            NSString *_name = [NSString stringWithCString:(const char *)aName encoding:NSUTF8StringEncoding];
            NSString *_phone = [NSString stringWithCString:(const char *)aPhone encoding:NSUTF8StringEncoding];
            
            Student *s = [[Student alloc] initWithID:aID Name:_name Phone:_phone];
            
            [stuArray addObject:s];
            [s release];
        }
        sqlite3_finalize(stmt); //关闭sqlite3
        return stuArray;
    }
    sqlite3_finalize(stmt);//如果不成功,返回空;
    return nil;
}

+ (BOOL)deleteFronStudent:(int)aID  //从student表里面删除数据
{
    sqlite3 *db = [DBHelper DBOpen];
    sqlite3_stmt *stmt = nil;
    int result;
    result = sqlite3_prepare(db, "delete from student where s_id = ?", -1, &stmt, NULL);
    BOOL seccess = NO;
    if (result == SQLITE_OK)
    {
        //绑定sql语句需要的参数;
        sqlite3_bind_int(stmt, aID, 1);// ?从1开始拍,1赋给?
        if (sqlite3_step(stmt) == SQLITE_DONE) {
            seccess = YES;
        }
    }
    return YES;
}

- (void)dealloc
{
    [_phone release],_phone = nil;
    [_name release],_name = nil;
    [super dealloc];
}
@end



//
//  DBHelper.h
//  SQlite
//
//  Created by VincentXue on 12-8-24.
//  Copyright (c) 2012年 VincentXue. All rights reserved.
//

#import <Foundation/Foundation.h>
#include <sqlite3.h>
@interface DBHelper : NSObject

+ (sqlite3 *)DBOpen;
+ (void)close;
@end


//
//  DBHelper.m
//  SQlite
//
//  Created by VincentXue on 12-8-24.
//  Copyright (c) 2012年 VincentXue. All rights reserved.
//

#import "DBHelper.h"
#include <sqlite3.h>

static sqlite3 *db = nil;
@implementation DBHelper

+ (sqlite3 *)DBOpen
{
    if (db) {
        return db;
    }
//    bundle路径
    NSString *bundlePath = [[NSBundle mainBundle] pathForResource:@"32StuSB" ofType:@"sqlite"];
    
    NSString *documentPath = [NSHomeDirectory()stringByAppendingPathComponent:@"Documents"];
    //目标路径
    NSString *targetPath = [documentPath stringByAppendingPathComponent:@"32StuSB.sqlite"];
    NSFileManager *fm = [NSFileManager defaultManager];
    BOOL success = NO;
    
    if ([fm fileExistsAtPath:targetPath] == NO)
    {
     success = [fm copyItemAtPath:bundlePath toPath:targetPath error:nil];
        
        if (success == YES)
        {
            sqlite3_open([targetPath UTF8String], &db);
        }
    }
    sqlite3_open([targetPath UTF8String], &db);
    return db;
}
//关闭数据库
+ (void)close
{
    if (db) {
        sqlite3_close(db);
    }
}
@end