php mysql trigger example

Why use a trigger? Advantages of triggers 1. Trigger's "automatic"For programmers, the trigger is invisible, but he does. If no trigger is needed, when you update the name field of the user table, you need to write code to update redundant fields in

One, what triggers1, personal understandingThe function of the trigger is to achieve synchronization between the two libraries, that is, the operation of library A and so on in the operation of library B, you can create a change on the table a

One, the advantages of the trigger1, the " automatic " of the triggerTo the programmer, the trigger is not visible, but he did do things, if you do not use a trigger, you update the user table name field, you also write code to update other tables

Reprint, original linkOne, what triggers1, personal understandingFlip-flops, literally understood, trigger a device, called triggers (haha, personal understanding), for example, like dark, you turn on the lights, you see things. You put the

One, what triggers1, personal understandingFlip-flops, literally understood, trigger a device, called triggers (haha, personal understanding), for example, like dark, you turn on the lights, you see things. You put the firecracker, lit, and then

I. What trigger is a special stored procedure. Its execution is not called by a program or started manually, but triggered by an event, for example, when you perform operations (insert, delete, update) on a table, it is activated for execution.

This article mainly introduces the MySQL5 trigger. Every time I demonstrate the actual code, I will use MySQL (the best combination with PHP) the code displayed on the screen of the client is adjusted, mainly by changing the font to Courier, making

Introduction to MySQL Trigger 1 The database server is passive in nature. We use an SQL statement to display the requirement, and it will execute an operation. A trigger is to program a passive server as an active server. A trigger is a piece of

One, what triggers 1, personal understandingTriggers, which are literally understood, a hair-trigger device, a trigger (haha, personal understanding), for example, like when it's dark, you turn on the light, you see something. You put the

Using MySQL UDFs and Trigger to operate MemcachedUDFs is short for UserDefinedFunctions, indicating MySQL user-defined functions, applications can use these functions to access data written or obtained by Memcached from databases of MySQL or later