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To use pdo, you need to open the pdo extension first. I have opened the pdo extension of mysql here ghostwu@dev:~$ php -m | grep pdo pdo_mysql ghostwu@dev:~$ 1. Connect to the database mysql> show create database shop \G; *************************** 1. row *************************** Database: shop Create Database: CREA ...

If you want to record the user table modified and defined by DDL, set the default value, and so on, you can use event triggers to achieve this purpose. Examples are as follows: testdb=# create extension hstore; testdb=# create or replace function ef_alter() returns event_trigger as $$ declare rec hstore; begin select hstore( ...

Data tables are usually associated with each other, and it is usually easier to use multi table associated query, which is more convenient and simple for more complex model associated query using laravel, Chinese document , take two tables of provinces and cities as an example Preliminary preparation: First, create a PlaceController controller ...

1 Overview As we said earlier Factory Mode and Abstract Factory Mode , let's talk about the builder model. The builder mode is also a very common creation mode. The two factory modes mentioned earlier hide the properties and construction details of a class, while the builder mode exposes the properties of a class appropriately through the Build ...

1. Background BoneCP used by friend company Mysql connection pool, the application accesses Mysql as domain name, which is configured as follows:   jdbc:mysql://order.mysql.xx.cn:3306/order?useUnicode=true&characterEncoding=UTF-8&allowMultiQueries=true All middleware access is through th ...

Author: Lu Lu Those who love technology and are willing to share are mainly engaged in the research of database related technology. Source: original contribution *Aikesheng is produced by the open source community. The original content cannot be used without authorization. Please contact the editor for reprint and indicate the source. 1. o ...

The purpose of this article is to introduce how to upgrade GaussDB stand-alone database from 1.0.0 to 1.0.2. Single machine supports automatic upgrade of small version and binary upgrade. For automatic upgrade, only one upgrade command needs to be executed on the node. 1. Upload package and decompress Upload the following two packages to the s ...

There is no function index function of Oracle in MySQL. It is not accurate to call the Generated Column of MySQL as "function index", but it can achieve the same effect as the function index. Some people also call this feature "derived column". What is Generated Column The value of Generated Column is calculated according to ...

web 1.web2 Check the source code, Firefox f12, viewer. 2. calculator f12 viewer, find the following line: <input type="text" class="input" maxlength="1"> Change maxlength to the number of digit ratio results, and you can enter it. 3.web foundation $ This is really the foundation. When get reques ...

Continued on the problem of Canal dynamicTopic Recently, I set up a set of canal in a new company. I set canal.mq.topic and canal.mq.dynamicTopic according to < < dynamictopic question > > The intention is to send some messages that do not match the dynamic topic matching statements to a d ...