cascade cms

Cascade, two or more devices are connected in a certain way, and the effect of expansion is cascade. Hibernate cascade is used to describe the relationship between multiple tables in the database (one-to-one, one-to-many, multiple-to-many). When you perform some operation on the primary object, whether to perform similar operations on the associated slave object.

must state : This blog is reproduced in Oracle foreign KEY cascade DELETE and cascade update http://www.2cto.com/database/201507/417496.htmlIn view of the previous collection of wonderful blog has been deleted, it is very sad, so still want to copyFirst, cascade deleteOracle Delete on foreign keys has no action (similar to restrict),

The previous article introduced the cascade operation of Hibernate persistence object, this article introduces the cascade operation when reading.Or use the previous example, a questionnaire has a number of questions, but each problem can only belong to a questionnaire. Let's look at the test case first:@Test public void Testreadfromquestionnaire () {Session session = Sessionfactory. Getcurrentsession();Ses

idx_cpumodel (cpumodel ); Define Foreign keys The following describes how to create a constraint between two tables ". Because the CPU model of the pc must refer to the corresponding model in the parts table, we set the cpumodel field of the pc table to "foreign key" (foreign key ), that is, the reference value of this key comes from other tables. Alter table pc add constraint fk_cpu_model Foreign key (cpumodel) REFERENCES parts (model ); Cascade ope

Details about CMS garbage collection mechanism and cms garbage collection Originality is not easy. It cannot be reproduced without permission ~~~ In general, the execution process of CMS can be divided into the following stages: 3.1 initial tag (STW) 3.2 concurrent mark 3.3 concurrent pre-cleaning 3.4 mark (STW) 3.5 concurrent cleaning 3.6 Reset 3.1 STW is requi

In hibernate, the configuration file for persistent objects contains the cascade attribute, as the name implies, cascade, that is, when Operations on the current object will affect the associated entities configured accordingly. For example, when you save the current object The object associated with it. Of course, the generation of this additional operation depends on whether you have configured the elemen

Cascade:Cascading: An object's chain operationCascade Save:Cascade Save: When you save a party to a bidirectional relationship, the error is reported by default, and you should set the Cascade save in Customr, that is, when you manipulate an object by manipulating other associated objectsConfigure the cascading update at the customer end:cascade= "Save-update" classIn the test case, the value is manipulated for customer: Cust.getorders (). Add (O1)

Css inheritance and cascade, css inheritance and cascade This section describes how to use the document structure and css selector to apply various styles to elements. Let's take a look at css cascade and inheritance. Let's talk about the concept first. Inheritance: the mechanism used by an element to pass attribute values to its child element. The popular point

Summarize:Cascade: To limit cascading operations, there are several parameters:All: associated operations are performed in all cases. None: Associated operations are not performed in all cases. This is the default value. Save-update: the associated operation is performed when Save/update/saveorupdate is executed. Delete: The associated operation is performed when the delete is executed. Inverse: In a one-to-many model, it can only be set on a single side, andinverse 's role is to update the pri

Database transactionsStart transaction; #开始事务Insert into GZB (GZ) values (5000);Insert into GZB (GZ) VALUES (6000);Insert into GZB (GZ) values (7000);Insert into GZB (GZ) values (8000); /* Perform the transaction and see if success data is added */Commit # commit data to see if the data in the table is submittedRollback #数据库回滚Cascade UPDATE, Cascade DeleteThere are two main ways of1. When building the table

For more information about how to delete SQL cascading updates, see For more information about how to delete SQL cascading updates, see The Code is as follows:On delete cascade When you update or delete a primary key table, the foreign key table will be updated or deleted together. You need to set cascade attributes when creating the table. Create table Countries (CountryId int primary key)Insert into

Copy codeThe Code is as follows: on delete cascade When you update or delete a primary key table, the foreign key table will be updated or deleted together. You need to set cascade attributes when creating the table. Create table Countries (CountryId int primary key)Insert into Countries (CountryId) VALUES (1)Insert into Countries (CountryId) VALUES (2)Insert into Countries (CountryId) VALUES (3) Creat

Php + ajax cascade menu [no refreshing cascade menu]. The php + ajax cascade menu released by this netizen is often called refreshing. The php + ajax cascade menu released by this netizen is often called refreshing .? Phpheader (C, the php + ajax cascade menu released by a n

Three major Css mechanisms (features): particularity, inheritance, details of cascade, css Cascade Inheritance(Inheritance) is a mechanism used to pass attribute values from an element to its child element. When determining which values should be applied to an element, the user agent (browser) should not only consider inheritance, but also consider declaringSpecial(Specificity). In addition, you need to con

Hibernate-mapping (1) cascade deletion and hibernate cascade Deletion Hibernate acts as the data access layer. It uses the configuration file (hibernate. properties or hibernate. cfg. xml) and ing files (***. hbm. xml) maps a JAVA object or PO (PersistentObject, persistence object) to a database, and then adds, deletes, modifies, and queries data in the data table through the PO operation. I have never used

Css details review notes-structure and cascade, css details review Cascade Each legal document generates a structure tree, with the ancestor of the Structure Tree element, the attribute sibling element, and so on, creating a selector to select the element. This is CSS.InheritanceCore. Inheritance is a mechanism used to pass attribute values from an element to a descendant element. When it is used for an ele

In the past, SQL Server only performed operations on the graphic interface. Now I find that my SQL language skills are getting worse and worse. For example, how to add associations for two tables, cascade update and delete. I checked it at night and found that two methods can be used. Trigger method:Create trigger trg_aOnFor update, deleteAsBeginIf exists (select 1 from inserted)Update B set name = (Select name from inserted) Where name = (Select nam

CSS particularity, inheritance and cascade, css Cascade I. Special rules The particularity of the selector is determined by the component of the selector. The particularity consists of four parts, whose initial values are 0, 0, 0. 1. For each id in the selector, record 0, 1, 0, 0; 2. For each class, pseudo class, and attribute in the selector, choose 0, 0, 1, 0; 3. For each element and pseudo element in the

CSS: The weight and cascade rules determine its priority. css Cascade Source: http://www.ido321.com/1063.html First, let's look at an example of CSS priority: http://www.ido321.com/76.html I. basic priority rules Compare the number at the same level, with a higher priority. If the number is the same, compare the number at the next level.The priority levels are as follows: Important> inline> ID> class> lab

CSS: The weight and cascade rules determine its priority. css Cascade Source: http://www.ido321.com/1063.html First, let's look at an example of CSS priority: http://www.ido321.com/76.html I. basic priority rules Compare the number at the same level. If the number is the same, it has a higher priority. If the number is the same, compare the number at the lower level. The priority for each level is as follo