1.案例简介
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
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2.项目工程目录
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