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 = [NSManagedObjectModelmergedModelFromBundles:nil];

    // 创建基础库协调器

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

    // 获取沙盒路径

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

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

    NSLog(@"%@",path);

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

    //为协调器加载基础库路径和基础库类型

    [psc addPersistentStoreWithType:NSSQLiteStoreTypeconfiguration:nilURL:url options:nilerror:nil];

    // 创建上下文

    NSManagedObjectContext * context = [[NSManagedObjectContextalloc]init];

    context.persistentStoreCoordinator = psc;

    // 初始化查询请求

    NSFetchRequest * request = [[NSFetchRequestalloc]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 = [NSSortDescriptorsortDescriptorWithKey:@"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 = [NSManagedObjectModelmergedModelFromBundles:nil];

    // 创建基础库协调器

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

    // 获取沙盒路径

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

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

    NSLog(@"%@",path);

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

    //为协调器加载基础库路径和基础库类型

    [psc addPersistentStoreWithType:NSSQLiteStoreTypeconfiguration:nilURL:url options:nilerror:nil];

    // 创建上下文

    NSManagedObjectContext * context = [[NSManagedObjectContextalloc]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 = [[NSFetchRequestalloc]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];

}

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原文：http://blog.csdn.net/zx6268476/article/details/45913761