对SQLite操作进行了简单的封装，将对数据表操作转变成对对象的操作，并通过UI界面完成对用户表的增、删、改、查，运行界面如下图所示

a

UserModel类为用户对象模型，与数据库表中字段一一对应

BaseDB类为对sqlite简单封装，抽象出对数据库操作的三个方法，具体内容看http://blog.csdn.net/whzhaochao/article/details/38865535博文

UserDB继承于BaseDB，主要是完成UserModel对象的增、删、改、查，其内容如下

UserDB.h

//
//  UserDB.h
//  SqliteDemo
//
//  Created by 赵超 on 14-8-27.
//  Copyright (c) 2014年 赵超. All rights reserved.
//

#import "BaseDB.h"
#import "UserModel.h"

@interface UserDB : BaseDB{
    
}
//单例
+(id)shareUserDB;
//创建User表
-(void)creatTableWithDataBaseName:(NSString*) dbName;
//增加一个UserModel
-(BOOL)addUser:(UserModel*)userModel dbName:(NSString*)dbName;
//修改一个UserModel
-(BOOL)updateUser:(UserModel*)userModel dbName:(NSString*)dbName;
//查询所有
-(NSArray*)findAllUser:(NSString*)dbName;
//删除一个对象
-(BOOL) deleteUser:(UserModel*)userModel dbName:(NSString*)dbName;

@end

UserDB.m

//
//  UserDB.m
//  SqliteDemo
//
//  Created by 赵超 on 14-8-27.
//  Copyright (c) 2014年 赵超. All rights reserved.
//

#import "UserDB.h"

@implementation UserDB

static UserDB * db;

+(id) shareUserDB{
    if (db==nil) {
        db= [[UserDB alloc] init];
    }
    return  db;
}

-(void)creatTableWithDataBaseName:(NSString*) dbName{
    NSString *sql=@"create table user( userName text primary key,passWord text, userEmail text)";
    [self createTable:sql dataBaseName:dbName];
    
}

-(BOOL) deleteUser:(UserModel*)userModel dbName:(NSString*)dbName{
        NSString *sql=@"delete from user where userName =?";
        NSArray *params=@[ userModel.userName];
     return  [self execSql:sql parmas:params dataBaseName:dbName];
}


-(BOOL)addUser:(UserModel *)userModel dbName:(NSString *)dbName{
    NSString *sql=@"insert into user (userName,passWord,userEmail) values (?,?,?)";
    NSArray *params=@[userModel.userName,userModel.passWord,userModel.userEmail];
    return  [self execSql:sql parmas:params dataBaseName:dbName];
}
-(NSArray*) findAllUser:(NSString *)dbName{
    NSString *sql=@"select userName,passWord,userEmail from user";
    NSArray *result= [self selectSql:sql parmas:nil dataBaseName:dbName];
    NSMutableArray *users=[NSMutableArray array];
    for (NSDictionary *dic in result) {
        UserModel *user=[[UserModel alloc] init];
        user.userName=[dic objectForKey:@"userName"];
        user.passWord=[dic objectForKey:@"passWord"];
        user.userEmail=[dic objectForKey:@"userEmail"];
        [users addObject:user];
    }
    
    return users;
    
}

-(BOOL)updateUser:(UserModel *)userModel dbName:(NSString *)dbName{
    NSString *sql=@"update user set userName=?,passWord=?,userEmail=? where userName=?";
    NSArray *params=@[userModel.userName,userModel.passWord,userModel.userEmail,userModel.userName];
    
    return [self execSql:sql parmas:params dataBaseName:dbName];
    
}


@end

MainViewController是用户显示所有用户列表

AddViewController用于增加和修改用户界面的显示

完整项目代码下载http://download.csdn.net/detail/whzhaochao/7829829