sg3 trigger

Tags: MySQL triggerLin Bingwen Evankaka Original works. Reprint please specify the source Http://blog.csdn.net/evankakaA trigger (TRIGGER) is an action triggered by an event. These events include INSERT statements, UPDATE statements, and DELETE statements. When the database system executes these events, the trigger is activated to perform the appropriate action.

jquery triggers the event to detach the code in JS, if we want to trigger a button click event, use the element's OnClick event directly, then call the relevant function, so that the code is combined with HTML, This is not the case in jquery, it has several other ways to make code separate from HTML: For example, there is a button on the page: We're going to trigger it. Click events can be in the foll

Label: first, the concept of triggers A trigger is a special stored procedure, in which the stored procedure is invoked with call, and the trigger does not need to be called, nor does it need to be started manually, as long as a predefined event occurs and is automatically called by MySQL. A trigger is a special kind of transaction that can monitor a data operati

Function: 1. Allow/restrict table modifications 2. automatically generate a derived column, such as an auto-increment Field 3. Forced Data Consistency 4. provide audit and logging 5. Prevent invalid transaction processing 6. Enable complex business logic Start Create trigger biufer_employees_department_id Before insert or update Of department_id On employees Referencing old as old_value New as new_value For each row When (new_value.department_id Begin

Create FUNCTION InsertComp (@ in varchar (30 ))RETURNS varchar (30)ASBEGINDeclare@ Pos int,@ Count int,@ Result varchar (30 ),@ Len intSet @ result = @ in-- The position before the pointSet @ pos = CHARINDEX ('.', @ result)-1If (@ pos =-1) set @ pos = len (@ result)Set @ count = @ pos-3While (@ count> = 1)BeginSet @ len = len (@ result)-@ countSet @ result = left (@ result, @ count) + ',' + substring (@ result, @ count + 1, @ len)Set @ count = @ count-3EndReturn @ resultEND

A trigger is a special type of stored procedure. The difference between a trigger and a stored procedure: a trigger is triggered by an event and executed automatically. a stored procedure can be called by the name of the stored procedure. A trigger is a special type of stored procedure when a table is inserted, updated

common is that there is a ratio between the price of the points to the price of normal hotels, such as normal hotels (Beijing hotels) 100 yuan per night, so the points Hotel (Beijing Hotel) requires 100*100 points. Previously, the hotel price for point redemption was manually specified when the system entered the price, but now the business is changed, the price needs to be automatically initialized when the Point Hotel is entered, this price is subject to the corresponding normal hotel price.

To create a collision you must add a rigid body (rigidbody) and a collider to the game object, which allows the body to move under physical influence. A collision body is a class of physical components that are added to a game object with a rigid body to trigger collisions. If two rigid bodies collide with each other, the physical engine calculates collisions unless two objects have collisions, and in a physical simulation, the first experience withou

What is a MySQL trigger, let's look at the meaning of the trigger first. The literal meaning of a trigger is a reaction triggered by a touch.MySQL must know that the trigger is interpreted as a MySQL statement (or a set of statements between the BEGIN and END statements) that is automatically executed by MySQL in respo

Tags: mysqlTrigger Brief1, Trigger basic concept2. Trigger syntax and practical examples3, before and after difference first, the basic concept of triggers 1. Triggered 2. Role: Monitor a situation and trigger an action 3. Observe the scene An e-shop: Product list, goods primary KEY (goods_id) Product name ( Goods_name)

Atitit... Summary of the trigger mechanism ltrigger mechanic sumup. O8f, ltriggero8f Atitit... Summary of the trigger mechanism ltrigger mechanic sumup. O8f 1. Trigger type 1 2. Implementation Principle 1 3. After trigger Vs Instead Of trigger 1 4. DML triggers Vs DDL trigg

Tags: trigger DDL triggerSQL Server DDL triggers (Trigger)--IntroductionTriggers (Trigger) are used only on specific objects, such as data tables. When the INSERT, Delete, update syntax for data Maintenance language (DML) works on these objects, the corresponding trigger is automatically called by the system, and inste

1. A trigger is a special stored procedure. It cannot be explicitly called. Instead, it is automatically activated when a record is inserted, updated, or deleted into the table. Therefore, triggers can be used to implement complex integrity constraints on tables.2. SQL Server creates two special tables for each trigger: The Inserted Table and the Deleted table. These two tables. 1. A

Tags: set case simple view character end table nameThe previous article is a relatively simple view, in fact, it is relatively simple to use, and later what more about the use of views, the time to add in their own. Next, let's look at the use of triggers! I. Overview OF triggers 　 1.1. What is a trigger Trigger (Trigger): Monitors a situation and triggers an act

Why to use triggers Advantages OF Triggers 1, the "automatic" of the trigger Triggers are invisible to programmers, but he did do things, if you do not use the trigger, you update the user table name field, you have to write code to update the other table redundant fields, I give an example, just a table, if a few tables have redundant fields, Does your code have a lot to write about and it doesn't seem t

To verify that ORA_CLIENT_IP_ADDRESS is valid only in the system trigger, the function of ORA_CLIENT_IP_ADDRESS returns the Client IP address of the VARCHAR2 type. Generally, it is only used in the system trigger. In fact, it is only valid in the system trigger. it is often said that the IP address obtained by using ORA_CLIENT_IP_ADDRESS is null, which is probabl

Oracle study note _ trigger Trigger The code block automatically executed when a specific event occurs. It is similar to a stored procedure, but users cannot directly call them. Function:1. Allow/restrict table modifications2. automatically generate a derived column, such as an auto-increment Field3. Forced Data Consistency4. provide audit and logging5. Prevent invalid transaction processing6. Enable comp

Trigger is similar to procedure and function, but it cannot be displayed and called. It can only be triggered by an event and then automatically called by oracle. Trigger is similar to procedure and function, but it cannot be displayed and called. It can only be triggered by an event and then automatically called by oracle. Trigger is similar to procedure an

Triggers can be created inside Oracle DBA Studio Tools CREATE TRIGGER name Create trigger-creates a new trigger Syntax CREATE TRIGGER name {before | After} {event [OR ...] } on table for each {ROW | STATEMENT} EXECUTE PROCEDURE func (arguments) Input name trigger

Perforce provides 2 middleware to allow users to customize or enhance the features of perforce: trigger and daemon. One triggersTriggers is a user-defined script, but it is automatically called by p4server under certain conditions to execute certain functions. If the script returns 0, it indicates the execution is successful. If the script returns a non-0 value, it indicates that the script fails to be executed, and the output of the script is re