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/*
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table structure for module attributes.
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Three tables; one to categorize attributes, one to hold the attribute names
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and one to link attribute to device with storage for a value
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*/
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/*
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attribute_category allows us to categorize the attributes based on what they are used for.
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for example, allows us to have names out of client table, and names out of device table
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as two separate attributes.
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*/
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drop table if exists attribute_category;
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create table attribute_category (
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attribute_category_id int unsigned not null auto_increment,
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name varchar(64) comment 'display name for category',
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primary key ( attribute_category_id )
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) comment 'categorizes attributes';
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/*
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this will hold the actual names of the attributes, such as name, uuid, serial number, cpu information, etc...
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*/
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drop table if exists attribute;
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create table attribute (
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attribute_id int unsigned not null auto_increment,
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name varchar(64) not null comment 'name for display' ,
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attribute_category_id int unsigned not null references attribute_category(attribute_category_id),
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added date,
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removed date default null,
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primary key (attribute_id),
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index (attribute_category_id)
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) comment = 'stores attribute names (not values) for other tables';
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/*
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stores the actual values.
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NOTE the key field table_id can reference different tables depending on the category of the
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attribute in question
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*/
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drop table if exists attribute_value;
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create table attribute_value (
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attribute_device_id int unsigned not null auto_increment,
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attribute_id int unsigned not null references attribute(attribute_id),
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table_id int unsigned not null comment 'reference to arbitrary table',
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value text null default null comment 'the actual value stored',
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added date,
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removed date default null,
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index (table_id,attribute_id),
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primary key (attribute_device_id)
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) comment 'attributes for devices';
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insert into attribute_category( name ) values ( 'client' ), ( 'site' ), ( 'device' );
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/* add one, default, attribute of 'name' for all three tables defined */
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insert into attribute( name,attribute_category_id )
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select
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'name',
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attribute_category.attribute_category_id
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from
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attribute_category;
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/*
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some convenience views on the main three tables which might use these, device, site and client
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*/
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drop view if exists view_attribute_client;
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create view view_attribute_client as
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select
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client.client_id,
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client.name client,
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attribute.name attribute,
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attribute_value.value,
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attribute_value.added,
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attribute_value.removed
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from
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attribute_value
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join attribute using (attribute_id)
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join attribute_category using (attribute_category_id)
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join client on ( attribute_value.table_id = client.client_id)
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where
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attribute_category.name = 'client';
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drop view if exists view_attribute_site;
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create view view_attribute_site as
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select
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site.site_id,
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site.name site,
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attribute.name attribute,
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attribute_value.value,
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attribute_value.added,
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attribute_value.removed
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from
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attribute_value
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join attribute using (attribute_id)
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join attribute_category using (attribute_category_id)
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join site on ( attribute_value.table_id = site.site_id)
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where
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attribute_category.name = 'site';
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drop view if exists view_attribute_device;
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create view view_attribute_device as
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select
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device.device_id,
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device.name device,
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attribute.name attribute,
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attribute_value.value,
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attribute_value.added,
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attribute_value.removed
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from
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attribute_value
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join attribute using (attribute_id)
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join attribute_category using (attribute_category_id)
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join device on ( attribute_value.table_id = device.device_id)
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where
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attribute_category.name = 'device';
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