从核心数据创建json字符串，反之亦然? [英] Create json string from core data and vice versa?

问题描述

我在核心数据中具有一对多关系的实体.创建实体后，如何将实体中的数据转换为json字符串并用json字符串填充核心数据实体?

I have got entities in core data with one to many relationship. How can I convert data in my entities to json string and populate core data entities with json string once it is created?

任何帮助将不胜感激...

Any help would be greatly appreciated...

推荐答案

将核心数据转换为json:

for core data to json:

根据您的要求从您的核心数据中获取数据，然后将其转换为json.

fetch the data from your coredata according to your requirements, & then converts it into json.

访问此链接至c 将数据导入json 另请参见此人

visit this link to core data to json also see this one

将json转换为核心数据

for json to core data

1)将JSON转换为本地Cocoa数据类型(NSDictionary和NSArray)
2)将NS *转换为Core Data对象

1)convert JSON to native Cocoa data types (NSDictionary and NSArray)
2)convert NS* into Core Data object

这意味着您可以将json数据检索到任何数组或任何对象中&然后将该对象或数据插入核心数据.

that means you can retrieve your json data into any array or any object & then insert that object or data into core data.

像这样从json获取数据

get data from json like this

NSMutableArray *json = (NSMutableArray* )[NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&err];
    Book.name = [[[json valueForKey:@"boxesDetail"] objectAtIndex:i] valueForKey:@"name"];
        Book.ID = [NSNumber numberWithInt:[[[[json valueForKey:@"boxesDetail"] objectAtIndex:i] valueForKey:@"number"] intValue]];

现在将此Book数据插入核心数据

now insert this Book data into core data

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