coredata

#import "ViewController.h"#import#import "Teacher.h"

#import "Student.h"

@interface ViewController ()

- (IBAction)insert:(UIButton *)sender;

- (IBAction)delete:(UIButton *)sender;

- (IBAction)update:(UIButton *)sender;

- (IBAction)select:(UIButton *)sender;

//关联上下文,一切的增删该查操作有context进行

@property(nonatomic,strong)NSManagedObjectContext *context;

@end

@implementation ViewController

- (void)viewDidLoad {

[super viewDidLoad];

self.context =[[NSManagedObjectContext alloc]initWithConcurrencyType:NSMainQueueConcurrencyType];

//关联数据库

//数据库的格式为momd

NSManagedObjectModel *model =[[NSManagedObjectModel alloc]initWithContentsOfURL:[[NSBundle mainBundle] URLForResource:@"Model" withExtension:@"momd"]];

//通过文件模型去初始化数据持久化助理

NSPersistentStoreCoordinator *store =[[NSPersistentStoreCoordinator alloc]initWithManagedObjectModel:model];

//创建文件路径

NSString *filePath =[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES).lastObject stringByAppendingPathComponent:@"model.sqlite"];

//关联路径

//如果需要版本迭代的话,那么要在options设置@{NSMigratePersistentStoresAutomaticallyOption:@YES,NSInferMappingModelAutomaticallyOption:@YES}并且要在一开始的时候就需要设置

[store addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:[NSURL fileURLWithPath:filePath ] options:@{NSMigratePersistentStoresAutomaticallyOption:@YES,NSInferMappingModelAutomaticallyOption:@YES} error:nil];

self.context.persistentStoreCoordinator =store;

NSLog(@"%@",filePath);

// Do any additional setup after loading the view, typically from a nib.

}

- (void)didReceiveMemoryWarning {

[super didReceiveMemoryWarning];

// Dispose of any resources that can be recreated.

}

//插入

- (IBAction)insert:(UIButton *)sender {

//创建一个学生

Student *stu1 = [NSEntityDescription insertNewObjectForEntityForName:@"Student" inManagedObjectContext:self.context];

//coredata的使用所有的增删改操作完成之后需要保存一下

stu1.name =@"国栋";

stu1.age  =@18;

Student *stu2 = [NSEntityDescription insertNewObjectForEntityForName:@"Student" inManagedObjectContext:self.context];

//coredata的使用所有的增删改操作完成之后需要保存一下

stu2.name =@"张凡";

stu2.age  =@20;

Student *stu3 = [NSEntityDescription insertNewObjectForEntityForName:@"Student" inManagedObjectContext:self.context];

//coredata的使用所有的增删改操作完成之后需要保存一下

stu3.name =@"张冲";

stu3.age  =@22;

Student *stu4 = [NSEntityDescription insertNewObjectForEntityForName:@"Student" inManagedObjectContext:self.context];

//coredata的使用所有的增删改操作完成之后需要保存一下

stu4.name =@"张华";

stu4.age  =@24;

Teacher *teacher1 =[NSEntityDescription insertNewObjectForEntityForName:@"Teacher" inManagedObjectContext:self.context];

teacher1.name =@"太皇太后";

teacher1.cosure=@"ios";

//    teacher1.myStudent =[NSSet setWithObjects:stu1,stu2,stu3,stu4, nil];

[teacher1 addMyStudent:[NSSet setWithObjects:stu1,stu2,stu3,stu4, nil]];

//    NSLog(@"集合的内容%@",teacher1);

[self.context save:nil];

}

//删除

- (IBAction)delete:(UIButton *)sender {

NSFetchRequest *request =[NSFetchRequest fetchRequestWithEntityName:@"Student"];

NSPredicate *pre =[NSPredicate predicateWithFormat:@"name LIKE %@",@"国*"];

request.predicate=pre;

NSArray *array=[self.context executeFetchRequest:request error:nil];

for (Student *stu in array) {

[self.context deleteObject:stu];

[self.context save:nil];

}

}

//跟新

- (IBAction)update:(UIButton *)sender {

//1.创建查询提

NSFetchRequest *requset =[NSFetchRequest fetchRequestWithEntityName:@"Student"];

//2. 设置查询条件(这一步可有可无,根据需求来决定)

NSPredicate *pre =[NSPredicate predicateWithFormat:@"name =%@",@"张凡"];

//3.用请求体点出条件.

requset.predicate=pre;

NSArray *array=  [self.context executeFetchRequest:requset error:nil];

for (Student *stu in array) {

//修改

stu.name =@"张展";

[self.context save:nil];

//NSLog(@"%@,%@",stu.name,stu.age);

}

}

//查询

- (IBAction)select:(UIButton *)sender {

/**

*1.创建查询提

2. 设置查询条件(这一步可有可无,根据需求来决定)

2.1 查询:经常用到的有三种,第一种直接查询.(name=张三)

第二种模糊查  NSPredicate *predicate =[NSPredicate predicateWithFormat:@"name CONTAINS %@",@"张"];

第三种:以什么结尾或以声明开头: NSPredicate *pre =[NSPredicate predicateWithFormat:@"name LIKE %@",@"*栋"];

用请求体点出条件.

3. 用context去执行查询请求 并用数组接受

*/

//nsfetchrequest

//创建查询学生表的请求体

//    NSFetchRequest *request =[NSFetchRequest fetchRequestWithEntityName:@"Student"];

//    //(第一种)查询年龄为20岁的人

//    /** 谓词*/

//    NSPredicate *predicate =[NSPredicate predicateWithFormat:@"age =%@",@20];

//    //加入谓词条件

//    request.predicate =predicate;

//****************************

//(第二种)查询姓张的人

//    NSPredicate *predicate =[NSPredicate predicateWithFormat:@"name CONTAINS %@",@"张"];

//    request.predicate=predicate;

//(第三种)查询名子以栋结尾的人

//    NSPredicate *pre =[NSPredicate predicateWithFormat:@"name LIKE %@",@"*栋"];

//    request.predicate=pre;

//********************

//(第四种)按年龄排序

//    NSSortDescriptor *sort =[NSSortDescriptor sortDescriptorWithKey:@"age" ascending:YES];

//        NSPredicate *predicate =[NSPredicate predicateWithFormat:@"name CONTAINS %@",@"张"];

//        request.predicate=predicate;

//    request.sortDescriptors=@[sort];

//执行查询操作

//  NSArray *array=  [self.context executeFetchRequest:request error:nil];

//    for (Student *stu in array) {

//        NSLog(@"%@ %@ %@",stu.name,stu.age,stu.number);

//    }

//查询老师表

NSFetchRequest *request =[NSFetchRequest fetchRequestWithEntityName:@"Teacher"];

NSArray *array =[self.context executeFetchRequest:request error:nil];

for (Teacher *tea in array) {

for (Student *stu in tea.myStudent) {

NSLog(@"%@的学生 %@ %@ %@",tea.name,stu.name,stu.age,stu.number);

}

}

}

@end