ios CoreData框架的使用，对上下文数据的增删改查，表与表之间的关联，1对多，1对1，谓词查询，多表连接

这里是只是代码，因为博客插入图片效果不是很好，我自己写的总结比较详细，有兴趣的朋友可以在评论里留下邮箱，我收到后会发给大家。
转载注明出处，重视原创者的劳动成果，谢谢！

- (void)viewDidLoad {

[super
viewDidLoad];



[self
_creatTable];//插入数据



// [self _query];// 查询数据



// KVC很霸道，即使readonly通过kvc也可赋值，kvo精华

// Book * book = [[Book alloc]init];

//// book.name = @"book1";

// [book setValue:@"book2" forKey:@"name"];

// NSLog(@"%@",book.name);
}

#pragma mark - _query查询
- (void)_query{

//
初始化模型

NSManagedObjectModel * model = [NSManagedObjectModel
mergedModelFromBundles:nil];



//
创建基础库协调器

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



//
获取沙盒路径

NSString * path = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,
NSUserDomainMask, YES)
firstObject];

path = [path stringByAppendingPathComponent:@"coreData.sqlite"];

NSLog(@"%@",path);

NSURL * url = [[NSURL
alloc]initFileURLWithPath:path];



//为协调器加载基础库路径和基础库类型

[psc addPersistentStoreWithType:NSSQLiteStoreType
configuration:nil
URL:url options:nil
error:nil];

//
创建上下文

NSManagedObjectContext * context = [[NSManagedObjectContext
alloc]init];

context.persistentStoreCoordinator = psc;



//
初始化查询请求

NSFetchRequest * request = [[NSFetchRequest
alloc]initWithEntityName:@"Teacher"];



//
谓词过滤（查询条件）

#pragma mark '='

// NSPredicate * predict = [NSPredicate predicateWithFormat:@"name = %@",@"zhangks"];

// NSPredicate * predict = [NSPredicate predicateWithFormat:@"name = 'zhangks'"];

#pragma mark '>'

// NSPredicate * predict = [NSPredicate predicateWithFormat:@"age >10"];

// NSPredicate * predict = [NSPredicate predicateWithFormat:@"name in %@",@[@"zhangsk",@"jack"]];

#pragma mark 'like'模糊查询

// NSPredicate * predict = [NSPredicate predicateWithFormat:@"name like %@",@"zha*"];

// NSPredicate * predict = [NSPredicate predicateWithFormat:@"name like %@",@"*zha*"];

// NSPredicate * predict = [NSPredicate predicateWithFormat:@"name like %@",@"*zha"];







#pragma mark 'and'和'&&'模糊查询

// NSPredicate * predict = [NSPredicate predicateWithFormat:@"name = %@ and age = 19",@"zhangks"];

// NSPredicate * predict = [NSPredicate predicateWithFormat:@"name = %@ && age = 19",@"zhangks"];



#pragma mark 'between'模糊查询

//
方式1

// NSPredicate * predict = [NSPredicate predicateWithFormat:@"age between {20,30}"];



//
方式2

// NSPredicate * predict = [NSPredicate predicateWithFormat:@"age between %@",@[@"10",@"29"]];

// predict = [NSPredicate predicateWithFormat:predict.predicateFormat];



// request.predicate = predict;



//
数据排序 ascending=YES顺序，ascending=NO倒序

NSSortDescriptor * sort = [NSSortDescriptor
sortDescriptorWithKey:@"name"
ascending:YES];
request.sortDescriptors =
@[sort];



NSError * error ;

//
执行查询语句

NSArray * array = [context
executeFetchRequest:request error:&error];//
查询结果返回的是数组

// NSInteger count = [context countForFetchRequest:request error:&error];

//
查询结果的个数，返回nsinteger





// NSLog(@"%li",count);



/*

// // KVC方式获取

// for (NSManagedObject * student in array) {

// NSLog(@"————————————————————%@,%li",[student valueForKey:@"name"],[[student/Users/zhangxin/Desktop/OC/UI/5.19/5.21coreData/testtestcoredata/testtestcoredata/ViewController.m valueForKey:@"age"] integerValue]);

// }



// // 子类KVC方式获取

// for (Student * student in array) {

// NSLog(@"%li,%@",[student.age integerValue],[student valueForKey:@"name"]);

// }

*///KVC



//
通过映射对象获取

for (Teacher * teacher
in array) {

NSLog(@"%@",teacher.name);
}



}

#pragma mark _creatTable
- (void)_creatTable{

//
初始化模型

NSManagedObjectModel * model = [NSManagedObjectModel
mergedModelFromBundles:nil];



//
创建基础库协调器

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



//
获取沙盒路径

NSString * path = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,
NSUserDomainMask, YES)
firstObject];

path = [path stringByAppendingPathComponent:@"coreData.sqlite"];

NSLog(@"%@",path);

NSURL * url = [[NSURL
alloc]initFileURLWithPath:path];



//为协调器加载基础库路径和基础库类型

[psc addPersistentStoreWithType:NSSQLiteStoreType
configuration:nil
URL:url options:nil
error:nil];

//
创建上下文

NSManagedObjectContext * context = [[NSManagedObjectContext
alloc]init];

context.persistentStoreCoordinator = psc;





// //
插入数据

// NSManagedObject * student = [NSEntityDescription insertNewObjectForEntityForName:@"Student" inManagedObjectContext:context];

// [student setValue:@"zhangks" forKey:@"name"];

// [student setValue:@(19) forKey:@"age"];

//

// NSManagedObject * teacher = [NSEntityDescription insertNewObjectForEntityForName:@"Teacher" inManagedObjectContext:context];

// [teacher setValue:@"zhqo" forKey:@"name"];



//
插入数据 新建 NSManagedObject subclass类 ,自动根据model中entity（实体）的表创建出类（继承自NSManagedObject，拥有NSManagedObject的属性和方法）所以直接用类名创建即可

// Student * student = [NSEntityDescription insertNewObjectForEntityForName:@"Student" inManagedObjectContext:context];

// student.name = @"jack";

// student.age = @(29);

//

//

//

// Teacher * teacher = [NSEntityDescription insertNewObjectForEntityForName:@"Teacher" inManagedObjectContext:context];

// teacher.name = @"limei";

//
初始化查询请求

NSFetchRequest * request = [[NSFetchRequest
alloc]initWithEntityName:@"Teacher"];



//
谓词过滤（查询条件）

// NSPredicate * predict = [NSPredicate predicateWithFormat:@"name = 'limei'"];



// request.predicate = predict;



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

for (Teacher * teacher
in array) {

Student * student1 = [NSEntityDescription
insertNewObjectForEntityForName:@"Student"
inManagedObjectContext:context];
student1.name =
@"jim";
student1.age =
@(12);
student1.relationship = teacher;











NSLog(@"%@,%@",teacher.name,student1.relationship.name);

//// teacher.name = @"liuwu";

//// [context deleteObject:teacher];

//
}



// NSSet * deleteSet = [context deletedObjects];//
删除（未save），执行删除语句后未保存前，缓存中（库表未修改）存储的删除数据

// NSSet * insertSet = [context insertedObjects];//同上



//
保存

NSError * error;
[context
save:&error];
}

ios CoreData框架的使用，对上下文数据的增删改查，表与表之间的关联，1对多，1对1，谓词查询，多表连接ios CoreData框架的使用，对上下文数据的增删改查，表与表之间的关联，1对多，1对1，谓词查询，多表连接ios CoreData框架的使用，对上下文数据的增删改查，表与表之间的关联，1对多，1对1，谓词查询，多表连接ios
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