MySQL

First, backup data:Mysqldump Common commands:Mysqldump-u User name-p password--databases database 1 database 2 > Xxx.sqlCommon options:-U: User name-P: Password-P: Port number, do not write default 3306--all-databases,-A: Backing Up all

MySQL forgot the password how to solveI have once mistakenly deleted the Mysqlroot user, how to do? The previous solution is to restart MySQL by ignoring the authorization table and then inserting the relevant data to solve the problem, but this way

First, the system database INFORMATION_SCHEMA: Virtual library, do not occupy disk space, storage is the database startup parameters, such as user table information, column information, permission information, character information, etc.

Original http://blog.csdn.net/goskalrie/article/details/53020631What is a triggerThe trigger (TRIGGER) is one of MySQL's database objects and is supported starting with version 5.0.2. This object is very similar to a function in a programming

First, Login RegistrationSecond, the login verification code relatedThird, the blog home display relatedFour, the current user's home directory displayV. Likes and cancellationsVi. Parent Comments and sub-comment actionsSeven, backstage management

PHP three ways to connect to MySQL:1. Native Connection modeNative connection is a process-oriented approachPHP$host= ' localhost ';$database= ' Test ';$username= ' Root ';$password= ' Root ';$selectName= ' Harry ';//the user name to look for,

2010-11-11 16:45 Type name Display length Database type Java type JDBC Type index (int) Describe

Sometimes we want to retrieve more than one field in a table for the keywords we give, we can use CONCAT_WS and concat to connect the fields that need to be retrieved, such as:Select * from where concat ('user_namelike'%root%';Or:Select * from

查看表上的索引状态:SHOW INDEXReturns table index information.SHOW KEYSand is SHOW INDEXES synonyms for SHOW INDEX .Grammar:Show {index|indexes} from table_name [from db_name] [where expr]The following fields is returned by SHOW INDEX . Field

The first stepCreate a databaseCREATE database nameStep TwoBuild tableCREATE TABLE Qquser(Qqid INT PRIMARY KEY not NULL,PASSWORD VARCHAR () not NULL,Lastlogintime DATETIME not NULL,Online INT not NULL,Levle INT not NULL)CREATE TABLE Baseinfo (Qqid

The relationship of the MySQL tableRelationship of the table:One-to-one: 1:1Eg: a person has only one identity cardNote: one-to-one key fields can be implemented by adding key fields.--Method OneCREATE TABLET_person (IDINT PRIMARY

Python's interaction with MySQL1. Installing the MySQL modulePIP3 Install Pymysql2. Connection objectUsed to establish a connection to the database2.1 Creating objectsconn = connection (parameter list)2.1.1 Parameter list Host: Connected

MySQL Log management error logConfiguration method:vim/etc/my.cnf[mysqld]log-error=/tmp/mysql.logTo see how to configure:' %log%error% ';Role:Log the general status of MySQL database and error information, is our database of regular error processing

Exporting Data* * Execute commands directly on the system:Export to CVS format:[[email protected] ~]# mysql-u root-p password-E "select * from Mydb.name into outfile '/tmp/12.cvs ' character set UTF8"--cha Racter Set UTF8 Specifies the appropriate

1. Copy the table structure into the new table. (Data in the table is not copied)CREATE table new table like old table;OrCREATE Table New Table SELECT * from old table WHERE 1=2;　　2. Copy the data into the new table. (The new table will not have a

1. Download JDBC. Unzip the JDBC and copy the Mysql-connector-java-version-ga-bin.jar file to Jmeter/lib 2. Open the JMeter and set the JDBC request. 1) dtbase url:jdbc:mysql://localhost:3306/datebasename. of which localhost : 3306, this is the

Lamp Architecture IntroductionLAMP is a shorthand for Linux Apache MySQL PHP, which is to put Apache, MySQL, and PHP on a Linux system to form an environment to run PHP's scripting language. Apache is the most commonly used Web services software,

How to optimize MySQL Foundation1, using the index to speed up the query Speed 2, the use of query cache or side-hanging cache, improve access speed cache: k/v key: Query statement hash value value: Query statement execution results which queries

Under Window1. Export the entire databaseMysqldump-u user name-p database name > exported file nameMysqldump-u dbuser-p dbname > Dbname.sql2. Export a tableMysqldump-u user name-P database name Table name > exported file nameMysqldump-u dbuser-p

Read and write separation: The simple is to separate the database read and write operations to the different database server, so as to effectively reduce the database pressure, but also to reduce the IO pressure. The main database provides write