通过谓词进行整数比较

问题描述

我使用的核心数据中有一个名为扫描" 的实体，该实体具有一个名为 electronic_id 的属性，该属性属于NSNumber类型.现在，假设在数据库中，我有3个 Scan 属性条目.

I am using core data in which I am having an entity called "Scan" who is having one attribute say electronic_id which is of NSNumber type. Now suppose in data base i am having 3 entries of this Scan attribute.

• 该实体的一个条目，其electronic_id为35.
• 该实体的第二个条目，具有354作为electronic_id.
• 该实体的第三项，其electronic_id为375.

• One entry of this entity having 35 as electronic_id.
• Second entry of this entity having 354 as electronic_id.
• Third entry of this entity having 375 as electronic_id.

我正在对此属性进行搜索.所以当我开始通过传递3来搜索实体时，我想要所有这3个对象.当我传递35时，我想要前两个对象.

I am performing searching on this attribute. so I when i start to search entity by passing 3 i want all these 3 objects.when i pass 35 then i want first two objects.

我想通过谓词对NSNumber上的对象进行部分匹配.我正在使用此功能.

I want partial matches objects on NSNumber through predicate.I am using this function.

-(void)filteredContentWithSearchText:(NSString*)searchText
{
    if([searchText length])
    {
        int value=0;
        value=[searchText intValue];

        if ([strSelectedType isEqualToString:@"Electronic ID"])
        {
            NSPredicate *predicate = [NSPredicate predicateWithFormat:@"electronic_id == %d",value];
            NSManagedObjectContext *context =[self managedObjectContext];
            NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
            NSEntityDescription *entity = [NSEntityDescription entityForName:@"Scan" inManagedObjectContext:context];

            [fetchRequest setEntity:entity];
            [fetchRequest setPredicate:predicate];
            NSError *error=nil;
            NSArray *results = [context executeFetchRequest:fetchRequest error:&error];
            if (error==nil)
            {

            }
            else if (error!=nil)
            {
                NSArray *results =[APP_DELEGATE CallForGetScan:YES Predicateis:predicate];
                [arrSessionSearchData removeAllObjects];
                [arrSessionSearchData addObjectsFromArray:results];
            }
        }
    }
}

请帮助如何比较NSPredicate中的整数.

Please help how to compare integer in NSPredicate.

在此先感谢.

推荐答案

尝试将整数转换为字符串并进行比较

Try cast integer to string and compare it

NSPredicate *predicate = [NSPredicate predicateWithFormat:@"electronic_id.stringValue CONTAINS[c] %@",searchText];

这篇关于通过谓词进行整数比较的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！