cascade acls

The trigger cannot be used to perform cascade update and deletion. If the foreignkey-to-field name relationship (or the foreignkey-to-unique relationship) uses SQL Server to establish dri. This dri constraint is used for the first test. If you update or delete a dri constraint, only the trigger is triggered when all constraints are passed. Therefore, the DRI foreignkey constraint cannot be associated with any update or

The use of foreign keys in MySQL to implement cascade Delete, updateMySQL supports foreign key storage engine only InnoDB, when creating foreign keys,Requires that the parent table must have a corresponding index, and the child table will automatically create the corresponding index when the foreign key is created.When you create an index, you can specify the corresponding action on the child table when the parent table is deleted, updated,Includes re

Personal definition: Primary prosecution: maintain one side of the joined table, usually the Creator side, which will be more efficient. Operation Principle: If inverse is set to false, one is set to true. When cascade is used to check the business status, the value one is true. I ,? Inverse acts as the party holding the set object and determines whether to control the entire set. true --- No, it is only configured in one-to-pair and allow-to-pai

We need to pay attention to the integrity of references when designing databases. During my career as a DBA, I saw many designs taking an extreme path. Before entering the detailed description of the delete cascade option, let's take a look at another option. You can set the udpate cascade option in a table with a foreign key. In my career, I have never met the need to update one or more columns with fore

First, Introduction:The AdaBoost classifier is composed of Cascade classifiers, which means that the final classifier is composed of several simple classifiers cascade. In the image detection, the inspection window through each level classifier, so that in the previous layer of detection in most of the candidate areas are excluded, all through the detection of each level of the area is the target area.Once

Stacking order and cascading context are two concepts, but they have an inseparable relationship, stacking order is very simple ^_^, serious thinking can be, and the stack context is insignificant, I just need to move the red line you understand, all said, is too simple. The first paragraph is difficult to understand, mainly with this article, only to resolve the displacement. Talk less, see the sword. In consideration of the possibility that two elements overlap, the concept of

"Problems encountered by your project":New delete can be implemented, that is, when the change cannot be synchronized update design three classes: Problem class Scask body content class Text Class View number + reply number + discussion number of Runinfo class"Body class and number of views + replies + Number of discussion classes cannot be modified update"Background changed annotation success"Reference blog: http://blog.sina.com.cn/s/blog_9b81777f0101gn3f.html"

Explain inverse (relational operations) and (cascade) operations with user, role, and user files as an exampleInverse evaluates to True (does not maintain relationship) or false (Maintenance relationship defaults to false) This property primarily operates on foreign keysCascade value Null (default), Save-update, all, deleteUsers, roles are many-to-many relationshipsThe user's mapping file represents:。。。。。 Inverse= "true" order-by= "progresstime desc

control: If the deleted record has been referenced by foreign key, will error, violate the main foreign KEY reference constraint! If the deleted records are not referenced, you can delete them directly.Cascade PropertyCascade indicates that a cascade operation "can be set to one or more of the other side"None cascade operation, default valueSave-update Cascade S

Setname= "FB"Cascade= "All-delete-orphan"Inverse= "true"Lazy= "false">Key>columnname= "zb_id"Not-null= "true" />Key>One-to-manyclass= "Gov.gzgs.djrwtx.bo.PxglFb" />Set> Both of these properties are used in a multiple-or many-to-many relationship.　　　　Inverse, especially for bidirectional relationships, is not needed in a one-way relationship.　　　　Cascade represents whether a

Master the high-end switch cascade to instantly become a master of the network, previously introduced the relevant knowledge. After the publication of the stack and cascade of switches, we have received a number of emails from many readers to discuss with us about the cascade of switches. So we will introduce some related content about high-end switch

When creating a database using the Oracle multi-Table cascading deletion method, all foreign keys are not cascade to prevent accidental deletion errors. I don't know when I entered a batch of wrong data, but I used the software to automatically import the data into the database. If I clicked a mistake, it would be difficult to delete it. The relationship between tables is complex, and the data volume is large. Deleting one table by one will definitely

Vswitch Optical Fiber port cascade connection mode and basic type when the two ports of mutual cascade are common port (that is, MDI-X) port and MDI-II port, should use a straight-through cable. Cross-cable should be used when both ports of mutual cascade are common ports (that is, MDI-X) or both are MDI-II ports. Whether it is 10Base-T Ethernet, 100Base-TX fast

Cascade Selector Based on vue2.0 and vue2.0 The cascade Selector Based on Vue. It can be single, Second, third-level Cascade, and multi-level Cascade. In web development, we often encounter cascade selector problems, especially in forms: Single

There are two routers in the home want to connect to use, or use someone else's network, want to pick up a router to use WiFi internet access, using a router cascade can connect two routers, convenient use of WiFi router. There are two ways to connect a two router: The first way: the route mode Cascade, the second level router and the superior router all have the routing function, two routers are two inde

MySQL supports foreign key storage engine only InnoDB, when creating foreign keys, requires the parent table must have a corresponding index, the child table when creating foreign keys will also automatically create the corresponding index. When you create an index, you can specify the corresponding actions on the child table when the parent table is deleted, updated, including restrict, NO action, SET NULL, and Cascade. where restrict and no action a

Original: Database Development-referential integrity-using the DELETE on CASCADE option in foreign keysOriginal:Http://www.mssqltips.com/sqlservertip/2743/using-delete-cascade-option-for-foreign-keys/?utm_source= dailynewsletterutm_medium=emailutm_content=headlineutm_campaign=2012731Referential integrity needs to be taken into account when designing databases, and in my career as a DBA, I've seen a lot of d

Label:transferred from: http://blog.csdn.net/codeforme/article/details/5539454foreign KEY constraints The meaning of the child table:Insert/update is not allowed on a child table if a candidate key is not found in the parent tableWhat foreign KEY constraints mean to the parent table:when you update/delete on a parent table to update or delete a candidate key that has one or more matching rows in the child table, the behavior of the parent table depends on: the on update/on delete clause that is

Oracle uses on delete cascade and on delete set null to create a foreign key. In this section, we introduce the default creation method of oracle when creating a foreign key constraint, when the referenced data is deleted, it cannot be deleted. This gives us more flexible options in oracle9i, however, we use the on delete cascade and on delete set null keywords to determine whether to delete the data refere

One-to-many relationship mappingsThe Set node information is configured in a one-party configuration file:The properties of the set node in the *.hbm.xml configuration file:Lazy: The default is true to use lazy loading, false for instant loading;Order-by: A party to a set set of multiple entities within a set of the sort method by default is the primary key sort but can be changed;Cascade: Whether to use cascade