entity-attribute-value

问题 I have a decision to make for a database with up to 20,000+ student profiles, Each student profile have more than 120+ Property, In many Enterprise projects like DOTNETNUKE CMS, the used method is two tables, one is UserProfile : [ProfileID],[UserID],[PropertyDefinitionID],[PropertyValue] and the other is : ProfilePropertyDefinition [PropertyDefinitionID],[DataType] ,[PropertyCategory],[PropertyName] If i used this method i will have 20,000 x 120 = 2.4 million row! I know this is the correct

问题 I have a large database with EAV structured data that has to be searchable and pageable. I tried every trick in my book to get it fast enough, but under certain circumstances, it still fails to complete in a reasonable time. This is my table structure (relevant parts only, ask away if you need more): CREATE TABLE IF NOT EXISTS `object` ( `object_id` bigint(20) NOT NULL AUTO_INCREMENT, `oid` varchar(32) CHARACTER SET utf8 NOT NULL, `status` varchar(100) CHARACTER SET utf8 DEFAULT NULL,

问题 So the following works $query = "SELECT A.entity_id, B.value AS variable_character, C.value AS text, D.value AS integer FROM customer_address_entity AS A LEFT JOIN customer_address_entity_varchar AS B ON B.entity_id = A.entity_id LEFT JOIN customer_address_entity_text AS C ON C.entity_id = A.entity_id LEFT JOIN customer_address_entity_int AS D ON A.entity_id = D.entity_id ORDER BY A.entity_id DESC LIMIT 100"; However there are many values that need to be joined to the entity in table A and

问题 So the following works $query = "SELECT A.entity_id, B.value AS variable_character, C.value AS text, D.value AS integer FROM customer_address_entity AS A LEFT JOIN customer_address_entity_varchar AS B ON B.entity_id = A.entity_id LEFT JOIN customer_address_entity_text AS C ON C.entity_id = A.entity_id LEFT JOIN customer_address_entity_int AS D ON A.entity_id = D.entity_id ORDER BY A.entity_id DESC LIMIT 100"; However there are many values that need to be joined to the entity in table A and

问题 I have a table with the following format. mysql> describe unit_characteristics; +----------------------+------------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +----------------------+------------------+------+-----+---------+----------------+ | id | int(10) unsigned | NO | PRI | NULL | auto_increment | | uut_id | int(10) unsigned | NO | PRI | NULL | | | uut_sn | varchar(45) | NO | | NULL | | | characteristic_name | varchar(80) | NO | PRI |

问题 I know this might sound a bit ridiculous, but I got a doubt that if we can represent relationship between two tables, how the two table's data is related, is there a way to represent relationship like, each registered user has a seperate pagelikes table. To make it more clear about my doubt, let me explain in this way, students enrolling for a few courses, say c, c++, java or others. Then, we can say: Student -(enrols for)- courses which means that student x can register for courses like c, c

问题 I've inherited a Magento project which an old developer was in charge of. Having very limited Magento experience, I'd like to understand how product collections and the catalog/product model is working. Specifically I'm wondering why the collection and product objects are so huge? I have code like this: <?php $_productCollection = $this->getLoadedProductCollection(); ?> <?php foreach ($_productCollection as $_product): ?> <?php $_product = Mage::getModel( 'catalog/product' )->load( $_product-

问题 I have different product types that have different attributes. They cannot be stored in a single table as the attributes are too distinct. There's a couple of options I'm currently looking at: EAV and a table for each type. My situation is, at the moment, there are only a number of types (lets say 8) but in the near future with almost 100% certainty, this can grow. But the growth is controlled by me, its not defined by users. It will be up to me to grow the product type. I'm currently

问题 I am writing a addressbook module for my software right now. I have the database set up so far that it supports a very flexible address-book configuration. I can create n-entries for every type I want. Type means here data like 'email', 'address', 'telephone' etc. I have a table named 'contact_profiles'. This only has two columns: id Primary key date_created DATETIME And then there is a table called contact_attributes. This one is a little more complex: id PK #profile (Foreign key to contact

问题 This question already has answers here : When can I save JSON or XML data in an SQL Table (8 answers) Storing JSON in database vs. having a new column for each key (10 answers) Closed 8 months ago . I'd like some feedback on having all properties a model can have in a properties table accessed via relationship (using laravel relationships) vs storing all properties/settings in the same table but in a json column. Currently, my application has a propeties table called settings that is also