FMDB模型写法
1.导入libsqlite3.0
2.导入FMDB第三方文件包
3.创建模型两个模型
//这里举例子创建数据库要储存的数据和ID指针
#import
@interface ClassMessage : NSObject
//数据库必须得有一个主键id
@property(nonatomic,assign)NSInteger classid;
@property(nonatomic,strong)NSString *name,*age,*sex;
@end
//.m 什么都不用写
#import “ClassMessage.h”
@implementation ClassMessage
@end
//第二个模型来对数据进行操作的一些方法
#import
//导入第一个模型的头文件
#import “ClassMessage.h”
@interface SqlData : NSObject
//单利方法
+(instancetype)initData;
//初始化数据库
-(void)initSql;
//初始化表格
-(void)initTable;
//添加数据
-(void)addData:(ClassMessage *)data;
//修改数据
-(void)upData:(ClassMessage *)data;
//删除数据
-(void)deleteData:(NSInteger )theid;
//查询数据
-(NSMutableArray *)array;
//关闭数据库
-(void)closeSql;
@end
**
**
/*
使用FMDB第三方框架 导入第三方框架
*/
#import “SqlData.h”
#import “FMDatabase.h”
#import “ClassMessage.h”
//创建静态变量
static SqlData *sqlData1;
static FMDatabase *db;
@implementation SqlData
//单利方法
- (instancetype)initData{
if (!sqlData1) {
sqlData1 = [[SqlData alloc] init];
}
return sqlData1;
}
//初始化数据库
-
(void)initSql{
//获取DOcuments目录
NSString *str = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)firstObject];
//拼接路径
NSString *fileName = [str stringByAppendingString:@"/strname.db"];
//创建数据库
db = [[FMDatabase alloc] initWithPath:fileName];
if ([db open]) {
NSLog(@“数据库打开成功”);
//调用初始化表格方法
[self initTable];
}else{
NSLog(@“数据库打开失败”);
}
}
//初始化表格
-(void)initTable{
//初始化数据库表格的格式：create table if not exists 表名(主键id integer primary key,所有的数据类型);
[db executeUpdate:@“create table ClassMessage(classid integer primary key,name text,age text,sex text)”];
//关闭数据库
[db close];
}
//添加数据 -
(void)addData:(ClassMessage *)data{
if ([db open]) {
//添加数据的sql语句：insert into 表名 values(null,?,?);
[db executeUpdate:[NSString stringWithFormat:@“insert into ClassMessage values(null,’%@’,’%@’,’%@’)”,data.name,data.age,data.sex]];
}else{
NSLog(@“添加数据失败”);
}
//关闭数据库
[db close];
}
//删除数据 -
(void)deleteData:(NSInteger)theid{
//sql 语句： delete from 表名 where 表名的主键id = ?
if ([db open]) {
[db executeUpdate:[NSString stringWithFormat:@“delete from ClassMessage where classid = ‘%ld’”,theid]];
}else{
NSLog(@“删除数据失败”);
}
//关闭数据库
[db close];
}
//修改数据 -
(void)upData:(ClassMessage *)data{
//sql 语句的格式：update 表名 set 所有数据 where 主键id = ?
if ([db open]) {
[db executeUpdate:[NSString stringWithFormat:@“update ClassMessage set name = ‘%@’ ,age = ‘%@’,sex = ‘%@’ where classid = ‘%ld’”,data.name,data.age,data.sex,data.classid]];
}else{
NSLog(@“修改数据失败”);
}
//关闭数据库
[db close];
}
//查询数据 -
(NSMutableArray *)array{
//创建数据
NSMutableArray *arr = [NSMutableArray array];
//集合
FMResultSet *set = [FMResultSet new];
if ([db open]) {
//sql 语句格式：select *from 表名
set = [db executeQuery:@“select *from ClassMessage”];
// 判断有没有查询到 一行一行去查询
while ([set next]) {
ClassMessage *msg = [[ClassMessage alloc] init];
msg.classid = [set intForColumn:@“classid”];
msg.name = [set stringForColumn:@“name”];
msg.age = [set stringForColumn:@“age”];
msg.sex = [set stringForColumn:@“sex”];
//将msg对象添加到数据
[arr addObject:msg];
}
}else{
NSLog(@“查询失败”);
}
[db close];
return arr;
}
//关闭数据库 -
(void)closeSql{
[db close];
}
@end
ViewController.h
#import
@interface ViewController : UITableViewController
@end
ViewController.m
#import “ViewController.h”
#import “SecViewController.h”
#import “SqlData.h”
#import “ClassMessage.h”
@interface ViewController ()
{
NSMutableArray *array;
}
@end
@implementation ViewController
-
(void)viewDidLoad {
[super viewDidLoad];self.title = @“数据库”;
//右侧按钮
self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemAdd target:self action:@selector(click)];
//设置行高
self.tableView.rowHeight = 100;
}
//视图即将显示的时候调用
-
(void)viewWillAppear:(BOOL)animated{
//调用数据库单利方法
[[SqlData initData] initSql];
//调用查询数据方法
array = [[SqlData initData] array];//刷新表格
[self.tableView reloadData];
}
#pragma mark UITableViewDataSource
-
(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
return array.count;
}
//设置cell内容
-
(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@“cell”];
if (!cell) {
cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@“cell”];
}
//创建classMessage对象
ClassMessage *classMsg = array[indexPath.row];cell.textLabel.text = [NSString stringWithFormat:@"%ld\n姓名:%@\n年龄:%@\n性别:%@",classMsg.classid,classMsg.name,classMsg.age,classMsg.sex];
cell.textLabel.numberOfLines = 0;
return cell;
}
//点击右侧按钮方法
-(void)click{
//跳转到第二个控制器
SecViewController *secVc = [SecViewController new];
[self.navigationController pushViewController:secVc animated:YES];
}
//点击单元格方法 -
(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{
//创建控制器
SecViewController *secVc = [SecViewController new];
//属性传值
secVc.msg = array[indexPath.row];
//跳转
[self.navigationController pushViewController:secVc animated:YES];
}
//让表格处于编辑状态 删除数据 -
(void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath{
[[SqlData initData]initSql];
//是删除主键id 获取数据库中的数据
[[SqlData initData]deleteData:[array[indexPath.row]classid]];
//删除数据
[array removeObject:array[indexPath.row]];
//刷新表格
[self.tableView reloadData];
}
SecViewController.h
#import
#import “ClassMessage.h”
@interface SecViewController : UIViewController
@property(nonatomic,strong)ClassMessage *msg;
@end
SecViewController.m
#import “SecViewController.h”
#import “ClassView.h”
#import “SqlData.h”
@interface SecViewController ()
{
ClassView *theView;
}
@end
@implementation SecViewController
-
(void)viewDidLoad {
[super viewDidLoad];//初始化classView
theView = [[ClassView alloc] initWithFrame:self.view.frame];
theView.backgroundColor = [UIColor lightGrayColor];
self.view = theView;theView.nameTf.text = self.msg.name;
theView.ageTf.text = self.msg.age;
theView.sexTf.text = self.msg.sex;if (!self.msg) {
self.title = @"添加数据"; self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemSave target:self action:@selector(save)];}else{
self.title = @"修改数据"; self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemEdit target:self action:@selector(edit)];}
}
//点击save方法 保存数据
-(void)save{
ClassMessage *message = [[ClassMessage alloc] init];
message.name = theView.nameTf.text;
message.age = theView.ageTf.text;
message.sex =theView.sexTf.text;
//调用数据库方法
[[SqlData initData]initSql];
//调用添加数据方法
[[SqlData initData] addData:message];
//返回上一级
[self.navigationController popViewControllerAnimated:YES];
}
//点击edit方法 修改数据
-(void)edit{
self.msg.name = theView.nameTf.text;
self.msg.age = theView.ageTf.text;
self.msg.sex = theView.sexTf.text;
//调用数据库方法
[[SqlData initData]initSql];
//调用修改数据方法
[[SqlData initData] upData:self.msg];
//返回上一级
[self.navigationController popViewControllerAnimated:YES];
}
@end
ClassView.h
#import
@interface ClassView : UIView
@property(nonatomic,strong)UITextField *nameTf,*ageTf,*sexTf;
@end
ClassView.m
#import “ClassView.h”
@implementation ClassView
//初始化方法
-
(instancetype)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {[self addSubview:self.nameTf]; [self addSubview:self.ageTf]; [self addSubview:self.sexTf];}
return self;
}
-(UITextField *)nameTf{if (!_nameTf) {
_nameTf = [[UITextField alloc]initWithFrame:CGRectMake(0, 90, self.frame.size.width, 44)];_nameTf.placeholder = @"please you name"; _nameTf.textAlignment = NSTextAlignmentCenter; _nameTf.borderStyle = UITextBorderStyleRoundedRect;}
return _nameTf;
}
-(UITextField *)ageTf{
if (!_ageTf) {
_ageTf = [[UITextField alloc]initWithFrame:CGRectMake(0, 140, self.frame.size.width, 44)];
_ageTf.placeholder = @"please you age";
_ageTf.textAlignment = NSTextAlignmentCenter;
_ageTf.borderStyle = UITextBorderStyleRoundedRect;
}
return _ageTf;
}
-(UITextField *)sexTf{
if (!_sexTf) {
_sexTf = [[UITextField alloc]initWithFrame:CGRectMake(0, 190, self.frame.size.width, 44)];
_sexTf.placeholder = @"please you sex";
_sexTf.textAlignment = NSTextAlignmentCenter;
_sexTf.borderStyle = UITextBorderStyleRoundedRect;
}
return _sexTf;
}
