MySQL

Learning route: Data Constraints--database design process--related knowledge of stored procedures--trigger--rights management(i) Data constraints1.1, the default value of the settingsCreate an employee table EMP sets the default address to ' China

Reference article: http://www.jb51.net/article/24392.htmWhen we design the database table structure, we need to pay attention to the performance of the data operation when we operate the database, especially the SQL statements when we look at the

1. Create a data tableMySQL>createtable test_while ( int Primarykey=0 rows affected (0.28 sec)View the structure of a data tableMysql> descTest_while;+-------+---------+------+-----+---------+-------+|Field|Type| Null | Key | Default |Extra|

Configure the character encoding for MySQL under Ubuntu. After installing MySQL, the system default character encoding is latin1, the input is Chinese, but the output is a bunch of garbled. Now all we have to do is set MySQL's default character

Yum appears when installing: Cannot retrieve Metalink for Repository:epel. Verify its path and try againThere was a problem installing php-mcrypt under CentOS 6.3 x86_64: Error:cannot retrieve Metalink for Repository:epel. Verify its path and try

Original: http://www.chinaz.com/program/2010/0315/108707.shtmlWorkaround:1. Change the table method.It may be that your account is not allowed to log on remotely, only on localhost. This time, as long as the computer on the localhost, log in to

Suppose we have a row in our user table. The user name is username. The value is AAA. The password field is pwd. The value is pwd.Let's simulate a user login process. 　This executes the SQL statement. It's obvious that you can find something.

Machine Introduction:Monitor192.168.146.131 Monitoring Servermaster-001192.168.146.129 Read-write host 001master-002192.168.146.130 Read-write host 002slave-001192.168.146.131 read-only host 001Virtual IP Assignmentmaster-001

MySQL PDO preprocessing can prevent SQL injection because:1, first look at the pre-processing syntax$pdo->prepare (' select * from Biao1 where Id=:id ');$pdo->execute ([': Id ' =>4]);2, statement One, the server sends a SQL to the MySQL server, the

Tag: The code filtering process contains the activity requirements record Lin andThere was a 2-day outage two days ago.Data requirements:1. Event Date 11.8-11.10 Order2, a single order to buy a class B products to meet the 68 yuan, and 3 consecutive

Recently in the data migration, there was a field of type Clob, after the migrated field type of Varchar,blob converted to string data, found that there is a emoji expression exists, resulting in data migration failure. The reason for the failure is

This article MySQL installation environment is Win7 64 bit, MySQL version is MySQL5.7Problem Description: Enter Mysql-u root-p on the command line to log in to MySQL and return "Can ' t connect to MySQL server on localhost (10061)" ErrorProblem

Indexes and error-proof mechanisms exist on the surface of a database table, but a simple query can take a long time. Web applications may run well in the development environment, but they behave equally poorly in a production environment. If you

A problem with using the MySQL database in the recent project, when using Spring's transaction annotations (@transaction) to manage transactions, found that in the method of @transaction markup with transaction annotations, if an exception occurred,

Method One:1. Stop MySQL Services: Service mysqld stop2. Start the MySQL service via Mysqld_safe and pass two parameters at the same time:--skip-grant-tables--skip-networkingnamely: Mysqld_safe--skip-grant-tables--skip-networking &3, the empty

Author:flymorn Source: Easy to floatcategories:php Programming Posttime:2011-1-14 15:35:07Text: Recently, due to the need to study the MySQL random extraction implementation method. For example, to randomly extract a

Modify Table NameALTER table name RENAME to new table name;A single SQL statement can only modify one tableShow tables;1.SELECT CONCAT ( ', table_name, ' RENAME to Db_ ' , 4 ), '; ' ) from

MySQL login password forget, in fact, the solution is very simple, just need to add a line "skip authorization Table" parameter selection in MySQL main configuration file my.cnf!Add the following line in MY.CNF:[Email protected] ~]# VIM/ETC/MY.CNF...

1. Why Use Views:To improve the reusability of complex SQL statements and the security of table operations (for example, the Payroll field does not want to show to all people who can view the results of the query), MySQL provides the view features.

Summary of several ways to execute SQL in mysql command line, mysqlsql 1. directly input SQL to execute MySQL> select now ();+ --------------------- +| Now () |+ --------------------- +| 13:55:45 |+ --------------------- +1 row in set (0.00 sec) 2.