MySQL

Trap 1: NULL values are not necessarily emptyIn MySQL databases, null represents a special meaning for some special types of columns, not just a null value. For these special types of columns, you must remember two types. One is what I mentioned

1. MySQL connects to the local database. The username is "root" and the password is "123" (Note: there cannot be spaces between "-P" and "123)C: \> mysql-H localhost-u root-p1232. Connect MySQL to the remote database (192.168.0.201), Port "3306",

Two steps are required to remotely connect to MySQL: The first step is to create a MySQL user that can be remotely connected Mysql> grant all privileges on remote. * to remote @ "%" identified by "remotepwd "; Or modify the Host field of an

After installing MySQL, you are familiar with basic usage, creating databases, and creating tables. However, when inserting Chinese data into the table, the characters read through C # are garbled, which turns out to be a code problem. MySQL uses

Flowchart: Official Chinese wiki: http://wiki.nginx.org/ChsGood resource site: the personal blog of www.s135.com is awesome.Nginx ("engine X") is a high-performance HTTP and reverse proxy server and an IMAP/POP3/SMTP proxy server. Nginx is accessed

BoolDefine(String name, mixed value [, bool case_insensitive])The define function defines constants. define('DB_HOST', 'localhost');define('DB_USER', 'root');define('DB_PWD', '123456');define('DB_NAME', 'mtest'); ResourceMysql_connect([String server

MySQL support is added to component v1.7 (MySQL 5.1 is tested ). The following shows how to use it. First add connectionstring   public static DbSession MySqlTest = new DbSession("MySQLConnectionString");   A new table mtable is created in the

Preface 　　 I haven't written any articles for a long time. I 've been busy with changing jobs and the end of the project. This time, I helped my friends to set up a C # program to connect to MySQL. I have encountered some problems. I 'd like to

From http:// I .19830102.com/archives/164   Python: 2.6: Http://www.python.org/download/releases/2.6.1/Download and install the MSI file Mysqldb version: MySQL-python-1.2.2.win32-py2.6.exe:

Dataworks OA adopts Tomcat 6 and mysql5, related solutions for Tomcat startup, MySQL startup, MySQL Case sensitivity, MySQL encoding, and Java connection to MySQL.   1.Delete MySQL from the service If you have installed different versions of

The master-slave configuration of the MySQL server is a very simple task. Instead of starting from scratch, it is always on the MySQL server that has been installed by others. This will involve the mysql version, startup File and other issues. But

-- Suitable for intra-site searches with over million data records and civilian-level solutions Environment: Linux mysql4/5 (versions above 5 can be directly compiled into MySql in the form of plug-ins) Friends who use MySQL must have the experience

Having usage Having clauses allow us to filter various data After grouping. Where clauses filter records before aggregation, that is, before group by and having clauses. The having clause filters group records after aggregation. SQL instance: 1.

Multi-version concurrency control multi-version Concurrency Control　　 Most MySQL transaction storage engines, such as InnoDB, Falcon, and pbxt, do not use a simpleSingle Row lock mechanism. In fact, they have always been used with another mechanism

Create Table persons(Id int unsigned not null auto_increment,Lastname varchar (255 ),Firstname varchar (255 ),Address varchar (255 ),City varchar (255 ),Created datetime,Primary Key (ID)) Type = MyISAM auto_increment = 1;Insert into persons

Sometimes it is thought that the server runs too long and MySQL cannot be released in the program, resulting in excessive pressure on the server. Therefore, let's imagine that Apache and MySQL memory will be released without restarting the

[Author: Zhang banquet this article version: V1.0 final modification: 2008.11.19 reprint please indicate the original article link: http://blog.s135.com/post/#/] In production applications, a data server with the "nginx + PHP + MySQL" interface

I haven't done any database-related things for a long time, and I can't remember the commonly used SQL statements! Today, I am reading mysql-related things in the country chart all day. Now let's make a simple arrangement. (Operating System: UBUNTU)1

Install MySQL Sudo apt-Get install mysql-Server This should be very simple, and I don't think there is much problem with the installation, so I will not talk about it much. Let's talk about the configuration below. Configure MySQL Note: In ubuntu,

Use execl to convert TimestampThe formula is:Code: =(xxxxxxxxxx+8*3600)/86400+70*365+19 Use a MySQL statement to explain the timestampSyntax example:   Code: SELECT FROM_UNIXTIME(1234567890, '%Y-%m-%d %H:%i:%S') Appendix:In MySQL, the storage type