最近给我媳妇写一个微商用的app。主要功能就是
1。销售记录 添加 查询 删除 修改
2。进货记录 添加 查询 删除 修改
3。常用广告语 一键复制 增加 修改 查询 删除
4。财务记录 各种进出账目统计
嗯 就是一个本地数据库app 不需要网络请求【主要是因为我不会后台。。。】
好吧 废话不多说 下面开始讲解
在这里 必须要感谢一下 好基友【大刘】 嗯 帮我学习了FMDB 并且给我写了一个demo 哈哈哈
1.加载FMDB
首先当然是在程序中 加载FMDB了 不然怎么用
传送门--点击我跳转下载链接
2.FMDB简单介绍
嗯 对于从来没用过这个功能的朋友来说 只是简单知道 这是一个方便 处理数据存储本地的第三方
其实 他只是给我们更好的封装了 SQL语句系统自带的存储方法
SQL语句 是我写iOS以来 遇到过第二恶心的东西 第一个是WebService
在 FMDB 中有三个重要的类:
FMDatabase:是一个提供 SQLite 数据库的类,用于执行 SQL 语句。
FMResultSet:用在 FMDatabase 中执行查询的结果的类。
FMDatabaseQueue:在多线程下查询和更新数据库用到的类。
3. 下面根据demo讲解 FMDB
//创建数据库
@interface FMDBForSell ()
{
FMDatabase *dateBase;
}
@end
- (BOOL)createDataBaseWithName:(NSString *)name{
//创建数据库
NSString *path=NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)[0];
dateBase = [FMDatabase databaseWithPath:[path stringByAppendingString:[NSString stringWithFormat:@"/%@",name]]];
return [dateBase open];
}
//创建表
- (BOOL)createTableWithDic:(NSArray *)arr{
NSMutableString *creat = [NSMutableString stringWithString:@"create table if not exists t_user(id integer primary key)"];
for (NSString *per in arr) {
[creat insertString:[NSString stringWithFormat:@",%@ varchar", per] atIndex:creat.length-1];
}
return [dateBase executeUpdate:creat];
}
首先第一步肯定是创建数据库 并且在数据库中创建表格
使用方法:
-(void)addFMDB
{
manager = [[FMDBForSell alloc] init];
//创建数据库
BOOL open = [manager createDataBaseWithName:@"abc.splist"];
//打开数据库
if (open) {
NSLog(@"数据库打开成功");
}
}
好 下面开始讲解一下 这个 创建数据库 跟 创建表的内容
我们可以看到 创建表 中 有一段
@"create table if not exists t_user(id integer primary key)"
这样的内容 那么这句话是什么意思呢?
首先要拆分一下
create table if not exists t_ 这句话 是前缀 不用更改,我只知道需要这么写 至于为什么 不好意思 我也不懂
t_user是表名,表示user表,table的缩写
(id integer primary key) id是integer类型,primary key表示是主键
这里 我把 创建表代码跟创建表的打印信息 标记出来
//创建表
//这里传的参数 就是 我们需要存储数据的model参数
BOOL createTable = [manager createTableWithDic:@[@"cid",@"cname",@"cmap",@"cphone",@"ctime",@"conemonery",@"callmonery",@"cnumber",@"cway",@"cwaymonery",@"cother",@"cover"]];
if (createTable) {
NSLog(@"创建表成功");
}
//打印结果
create table if not exists t_user(id integer primary key,cid varchar,cname varchar,cmap varchar,cphone varchar,ctime varchar,conemonery varchar,callmonery varchar,cnumber varchar,cway varchar,cwaymonery varchar,cother varchar,cover varchar)
到这里 基本上创建表就结束了 当你创建成功的时候 就会打印出 创建表成功 的字样
下面开始讲解 增删改查的应用
1.增加
//插入一个model
- (BOOL)insertWithModel:(sellModel *)model{
BOOL isBe = [self selectDataWithId:[model.cid intValue]];
if (isBe) {
[tishiXiaoShiViewController showMessage:@"ID已存在,重新像一个"];
return [self updateDataWithModel:model]; //更新数据
} else {
NSString * insertSql = [NSString stringWithFormat:@"insert into t_user(cid,cname,cmap,cphone,ctime,conemonery,callmonery,cnumber,cway,cwaymonery,cother,cover) values('%@','%@','%@','%@','%@','%@','%@','%@','%@','%@','%@','%@') ;", model.cid, model.cname, model.cmap,model.cphone,model.ctime,model.cOneMonery,model.cAllMonery,model.cNumber,model.cway,model.cwayMondery,model.cother,model.cover];
return [dateBase executeUpdate:insertSql];
}
}
这里 的代码就比较简单了 基本上没有什么大家不懂的
SQL语句中再次标记一点 t_user 这个字段 一定 不能更改
2。删除
//删除表
- (BOOL)deleteDataBase{
NSString * delete=@"delete from t_user";
return [dateBase executeUpdate:delete];
}
//删除一条记录
- (BOOL)deleteDataBaseWithModel:(sellModel *)model{
NSString * delete = [NSString stringWithFormat:@"delete from t_user where cid = '%@'",model.cid];
return [dateBase executeUpdate:delete];
}
这里就比较简单 一条是删除表【也就是删除全部】
一条是单独删除 【这里 我是根据 model中的cid 字段 查找数据并且删除 如果你没有id 那就跟觉别的字段是一样的 】
不管用什么 这里需要注意的一点就是 SQL语句中
t_user where cid
这句话中的cid 需要 根据各自需求去更改 可以是id 可以是name 可以是age 可以是你定义的一切字段 只要 你的表中包含这个字段就行
3.查询
//查询所有的
- (NSArray *)selectAllModels{
NSMutableArray *results = [NSMutableArray array];
NSString * sql = @"select * from t_user";
FMResultSet *result = [dateBase executeQuery:sql];
while(result.next){
sellModel *model = [self selectDataWithResult:result];
[results addObject:model];
}
return results;
}
//查询一条记录
- (sellModel *)selectDataWithId:(int)id{
NSString * sql = [NSString stringWithFormat:@"select * from t_user where cid = '%d'",id];
FMResultSet *result = [dateBase executeQuery:sql];
sellModel *model;
if ([result next]) {
model = [self selectDataWithResult:result];
}
return model;
}
查询语句中 也比较简单 复制代码即可
这两条分别是
查询表中所有数据
查询单条数据
这里需要及时一下的 依旧是SQL语句
select * from t_user where cid = '%d'",id
这句话 这个id 在传进来之前 已经经过处理 所以 不在是String
【为了model统一 防止出现类型错误导致的一些不必要问题 所以我吧所有属性全部设置成String】;
这里还有一种查询方法是 条件筛选 上面那种筛选方式 是根据id查询 如果想根据别的字段查询 那么久需要用到条件筛选
- (NSArray *)queryData:(NSString *)querySql
{
if (querySql == nil) {
querySql = @"SELECT * FROM t_modals;";
}
NSMutableArray *arrM = [NSMutableArray array];
FMResultSet *result = [dateBase executeQuery:querySql];
while ([result next]) {
sellModel *model = [[sellModel alloc]init];
int ids = [result intForColumn:@"cid"];
NSString *name = [result stringForColumn:@"cname"];
NSString *map = [result stringForColumn:@"cmap"];
NSString *cphone = [result stringForColumn:@"cphone"];
NSString *ctime = [result stringForColumn:@"ctime"];
NSString *conemonery = [result stringForColumn:@"conemonery"];
NSString *callmonery = [result stringForColumn:@"callmonery"];
NSString *cnumber = [result stringForColumn:@"cnumber"];
NSString *cway = [result stringForColumn:@"cway"];
NSString *cwaymonery = [result stringForColumn:@"cwaymonery"];
NSString *cother = [result stringForColumn:@"cother"];
NSString *cover = [result stringForColumn:@"cover"];
model.cid = [NSString stringWithFormat:@"%d",ids];
model.cname = name;
model.cmap = map;
model.cphone = cphone;
model.ctime = ctime;
model.cOneMonery = conemonery;
model.cAllMonery = callmonery;
model.cNumber = cnumber;
model.cway = cway;
model.cwayMondery = cwaymonery;
model.cother = cother;
model.cover = cover;
[arrM addObject:model];
}
return arrM;
}
在这个语句中 querySql 就是筛选条件
使用方法
NSString * tiaojian = @"我是筛选条件";
NSString * shaixuan = @"我是筛选内容";
NSString *fuzzyQuerySql = [NSString stringWithFormat:@"SELECT * FROM t_user WHERE %@ LIKE '%%%@%%'",tiaojian,shaixuan];
searcharray = [manager queryData:fuzzyQuerySql];
在使用的时候 需要 确认的是
t_user
WHERE %@ LIKE
至于为什么 有 %%%@%%' 这样的符号? 是因为 筛选条件 可能会是中文 虽然我不明白代表什么意思 但是写上肯定没错就对了!
4.修改
- (BOOL)modifyData:(sellModel *)model
{
NSString *update = [NSString stringWithFormat:@"update t_user set cid = '%@', cname = '%@',cmap = '%@',cphone = '%@',ctime = '%@',conemonery = '%@',callmonery = '%@',cnumber = '%@',cway = '%@',cwaymonery = '%@',cother = '%@',cover = '%@' WHERE cid = '%@'",model.cid,model.cname, model.cmap,model.cphone,model.ctime,model.cOneMonery,model.cAllMonery,model.cNumber,model.cway,model.cwayMondery,model.cother,model.cover, model.cid];
return [dateBase executeUpdate:update];
}
关于这个修改呢 只需要把对应model传进来 就好了
这里面我依旧是根据cid 进行判断的
细心的朋友可能会发现 我在sql语句中 多了一个 WHERE cid = '%@'
没错 这就是 判断信息
也就是说 本次修改 需要根据 什么条件 去查找表中对应的信息并且修改
好了 到这里 基本上 我们已经 简单的讲解完了 FMDB 的基本使用方法 可能有些同学还是很懵逼啊
那继续往下看! 下面附上 代码~
//
#import <Foundation/Foundation.h>
@class sellModel;
@interface FMDBForSell : NSObject
//创建数据库
- (BOOL)createDataBaseWithName:(NSString *)name;
//创建表
- (BOOL)createTableWithDic:(NSArray *)arr;
//插入一个model
- (BOOL)insertWithModel:(sellModel *)model;
//删除表
- (BOOL)deleteDataBase;
//删除一条记录
- (BOOL)deleteDataBaseWithModel:(sellModel *)model;
//查询所有的
- (NSArray *)selectAllModels;
//查询一条记录
- (sellModel *)selectDataWithId:(int)id;
//修改数据
- (BOOL)updateDataWithModel:(sellModel *)model;
/** 修改数据 */
- (BOOL)modifyData:(sellModel *)model;
//筛选查看
- (NSArray *)queryData:(NSString *)querySql;
@end
//
// FMDBForSell.m
// zhanzhan
//
// Created by 辛书亮 on 2017/1/19.
// Copyright © 2017年 孟小猫. All rights reserved.
//
#import "FMDBForSell.h"
#import "FMDB.h"
#import "sellModel.h"
#import "tishiXiaoShiViewController.h"
@interface FMDBForSell ()
{
FMDatabase *dateBase;
}
@end
@implementation FMDBForSell
//创建数据库
- (BOOL)createDataBaseWithName:(NSString *)name{
//创建数据库
NSString *path=NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)[0];
dateBase = [FMDatabase databaseWithPath:[path stringByAppendingString:[NSString stringWithFormat:@"/%@",name]]];
return [dateBase open];
}
//创建表
- (BOOL)createTableWithDic:(NSArray *)arr{
NSMutableString *creat = [NSMutableString stringWithString:@"create table if not exists t_user(id integer primary key)"];
for (NSString *per in arr) {
[creat insertString:[NSString stringWithFormat:@",%@ varchar", per] atIndex:creat.length-1];
}
return [dateBase executeUpdate:creat];
}
//插入一个model
- (BOOL)insertWithModel:(sellModel *)model{
BOOL isBe = [self selectDataWithId:[model.cid intValue]];
if (isBe) {
[tishiXiaoShiViewController showMessage:@"ID已存在,重新像一个"];
return [self updateDataWithModel:model];
} else {
NSString * insertSql = [NSString stringWithFormat:@"insert into t_user(cid,cname,cmap,cphone,ctime,conemonery,callmonery,cnumber,cway,cwaymonery,cother,cover) values('%@','%@','%@','%@','%@','%@','%@','%@','%@','%@','%@','%@') ;", model.cid, model.cname, model.cmap,model.cphone,model.ctime,model.cOneMonery,model.cAllMonery,model.cNumber,model.cway,model.cwayMondery,model.cother,model.cover];
// NSString * insertSql = [NSString stringWithFormat:@"insert into t_user(id,name,sex) values('%@','%@','%@')", model.id, model.name, model.sex];
return [dateBase executeUpdate:insertSql];
}
}
//更新数据
- (BOOL)updateDataWithModel:(sellModel *)model{
NSString *update = [NSString stringWithFormat:@"update t_user set cid = '%@',cname = '%@',cmap = '%@',cphone = '%@',ctime = '%@',conemonery = '%@',callmonery = '%@',cnumber = '%@',cway = '%@',cwaymonery = '%@',cother = '%@',cover = '%@'", model.cid, model.cname, model.cmap,model.cphone,model.ctime,model.cOneMonery,model.cAllMonery,model.cNumber,model.cway,model.cwayMondery,model.cother,model.cover];
return [dateBase executeUpdate:update];
}
- (BOOL)modifyData:(sellModel *)model
{
NSString *update = [NSString stringWithFormat:@"update t_user set cid = '%@', cname = '%@',cmap = '%@',cphone = '%@',ctime = '%@',conemonery = '%@',callmonery = '%@',cnumber = '%@',cway = '%@',cwaymonery = '%@',cother = '%@',cover = '%@' WHERE cid = '%@'",model.cid,model.cname, model.cmap,model.cphone,model.ctime,model.cOneMonery,model.cAllMonery,model.cNumber,model.cway,model.cwayMondery,model.cother,model.cover, model.cid];
return [dateBase executeUpdate:update];
}
//删除表
- (BOOL)deleteDataBase{
NSString * delete=@"delete from t_user";
return [dateBase executeUpdate:delete];
}
//删除一条记录
- (BOOL)deleteDataBaseWithModel:(sellModel *)model{
NSString * delete = [NSString stringWithFormat:@"delete from t_user where cid = '%@'",model.cid];
return [dateBase executeUpdate:delete];
}
//查询所有的
- (NSArray *)selectAllModels{
NSMutableArray *results = [NSMutableArray array];
NSString * sql = @"select * from t_user";
FMResultSet *result = [dateBase executeQuery:sql];
while(result.next){
sellModel *model = [self selectDataWithResult:result];
[results addObject:model];
}
return results;
}
//查询一条记录
- (sellModel *)selectDataWithId:(int)id{
NSString * sql = [NSString stringWithFormat:@"select * from t_user where cid = '%d'",id];
FMResultSet *result = [dateBase executeQuery:sql];
sellModel *model;
if ([result next]) {
model = [self selectDataWithResult:result];
}
return model;
}
- (NSArray *)queryData:(NSString *)querySql
{
if (querySql == nil) {
querySql = @"SELECT * FROM t_modals;";
}
NSMutableArray *arrM = [NSMutableArray array];
FMResultSet *result = [dateBase executeQuery:querySql];
while ([result next]) {
sellModel *model = [[sellModel alloc]init];
int ids = [result intForColumn:@"cid"];
NSString *name = [result stringForColumn:@"cname"];
NSString *map = [result stringForColumn:@"cmap"];
NSString *cphone = [result stringForColumn:@"cphone"];
NSString *ctime = [result stringForColumn:@"ctime"];
NSString *conemonery = [result stringForColumn:@"conemonery"];
NSString *callmonery = [result stringForColumn:@"callmonery"];
NSString *cnumber = [result stringForColumn:@"cnumber"];
NSString *cway = [result stringForColumn:@"cway"];
NSString *cwaymonery = [result stringForColumn:@"cwaymonery"];
NSString *cother = [result stringForColumn:@"cother"];
NSString *cover = [result stringForColumn:@"cover"];
model.cid = [NSString stringWithFormat:@"%d",ids];
model.cname = name;
model.cmap = map;
model.cphone = cphone;
model.ctime = ctime;
model.cOneMonery = conemonery;
model.cAllMonery = callmonery;
model.cNumber = cnumber;
model.cway = cway;
model.cwayMondery = cwaymonery;
model.cother = cother;
model.cover = cover;
[arrM addObject:model];
}
return arrM;
}
- (sellModel *)selectDataWithResult:(FMResultSet *)result{
sellModel *model = [[sellModel alloc] init];
int ids = [result intForColumn:@"cid"];
NSString *name = [result stringForColumn:@"cname"];
NSString *map = [result stringForColumn:@"cmap"];
NSString *cphone = [result stringForColumn:@"cphone"];
NSString *ctime = [result stringForColumn:@"ctime"];
NSString *conemonery = [result stringForColumn:@"conemonery"];
NSString *callmonery = [result stringForColumn:@"callmonery"];
NSString *cnumber = [result stringForColumn:@"cnumber"];
NSString *cway = [result stringForColumn:@"cway"];
NSString *cwaymonery = [result stringForColumn:@"cwaymonery"];
NSString *cother = [result stringForColumn:@"cother"];
NSString *cover = [result stringForColumn:@"cover"];
model.cid = [NSString stringWithFormat:@"%d",ids];
model.cname = name;
model.cmap = map;
model.cphone = cphone;
model.ctime = ctime;
model.cOneMonery = conemonery;
model.cAllMonery = callmonery;
model.cNumber = cnumber;
model.cway = cway;
model.cwayMondery = cwaymonery;
model.cother = cother;
model.cover = cover;
return model;
}
@end
使用代码
-(void)viewDidLoad
{
manager = [[FMDBForSell alloc] init];
//创建数据库
BOOL open = [manager createDataBaseWithName:@“111.sqlist”];
//打开数据库
if (open) {
NSLog(@"数据库打开成功");
}
// [manager deleteDataBase];
[self.updataArray removeAllObjects];
NSArray *arr = [manager selectAllModels];
for (int i = 0 ; i < arr.count; i ++) {
sellModel *model = [[sellModel alloc]init];
model = arr[i];
[self.updataArray addObject:model];
}
[self.GatoTableview reloadData];
}
下面贴上 app演示