MySQL

In the MySQL database, set the ID for the self-growth type, but because the program is still in the development phase, it is easy to produce error data, and then directly deleted, but the ID of the self-growth value is not reduced, here is the

Select t.student_id, T4.name, T5.name, Ifnull (T6.name, "")From Student_info tLeft join Student_type t1 in t.student_id=t1.student_id and T1.level=0 left joins student_type_info T4 on T1.type_id=t4.idLeft join Student_type T2 in

Solution 1: Set the alarm level in the PHP program codeMethod 2: Disable PHP errorDisplay_errors = on change to display_errors = OffMethod 3: Use Mysqli or PDOWe recommend that you cancel MySQL as soon as possible, all toward mysqli or PDO and so on.

Original address: http://blog.sina.com.cn/s/blog_52d20fbf0100ofd5.html1, function of the string class CHARSET (str)// return string character setCONCAT (string2 [,...])//Connection StringINSTR (string, substring)//returns the position of the first

Use Zabbix default templates to monitor MySQL, which is named template App MySQL.1, in the monitoring of the MySQL host installed on the client, specifically do not repeat, you can refer to http://chinawu.blog.51cto.com/10692884/1750861.2, in the

This article is very good, just turn him around.ObjectiveSorting is a basic function in a database, and MySQL is no exception. The order BY statement allows the user to sort the specified result set, in fact, not only the order BY statement, the

About Wait_timeoutOnce went to online set wait_timeout when found changed does not take effect, as follows:Mysql> Show variables like ' wait_timeout ';+---------------+-------+| variable_name | Value |+---------------+-------+| Wait_timeout | 100 |+-

1. OverviewThe first is to prepare two servers, one master server (master), the other from the server (Slave), and then to ensure that the master and Slave version of the same and master can not be higher than Slave version, it is generally prudent

MySQL command line export database:1. Go to the Bin folder in the MySQL directory: cd MySQL to the Bin folder directoryAs I entered the command line: CD C:\Program files\mysql\mysql Server 4.1\bin(or add the directory to the Windows environment

Installing PHP on Linux is a little more complex than Windows, and it's not as easy to integrate as Windows. Technology is about tossing.Linux version can be referenced prior to the release of Linux installation php mongodb extensionInstallation

MySQL has been mentioned in many places, and children's shoes that have not previously been contacted by MySQL database can walk into MySQL's world with me.http://hovertree.com/menu/mysql/Installation I will not say more, are the installation of

User ManagementMysql>use MySQL;ViewMysql> select Host,user,password from user;CreateMysql> create user Zx_root identified by ' xxxxx '; Identified by will store plaintext password encryption as a hash valueModifyMysql>rename User Feng to

Today, Baidu, see an article on the MySQL database optimization experience, read probably understand, become their own optimize your MySQL query cache queries on the MySQL server to enable high-speed query caching. Having the database

PHP and MySQL transaction processing2016-03-28 fal PHP programming There are two main ways to handle MySQL transactions.1, with Begin,rollback,commit to achieveBegin a transactionROLLBACK TRANSACTION RollbackCommit TRANSACTION Acknowledgement2,

Several issues encountered in the business database are resolved:1.ibdata too big problem, ibdata30g around, do backup when storage write speed is very slowAdding innodb_file_per_table=1 can modify InnoDB as a stand-alone tablespace pattern, and

Transferred from: http://blog.csdn.net/zhangzhizhen1988/article/details/8432146MySQL Clear table is a very important operation, but also one of the most common operations, the following for you to detail the implementation of the MySQL empty table,

The characters stored in the computer need to use the encoding set, early ASCII set, but with the development of technology, the ASCII set can not meet the requirements, there are more and more characters, such as Chinese character. Later developed

In today's project, we need to get the newly inserted auto-growth primary key values:pstmt=conn.preparestatement (SQL);... rs =pstmt.getgeneratedkeys ();Who knows the error:Generated keys not requested. You need to specify Statement.return_generated_

One, what is MySQL multi-instanceMySQL multi-instance, simply put, is to open a number of different MySQL service ports (such as 3306,3307) on a single server, running multiple MySQL service processes. These service processes use different sockets

The occasional sight of ... Maybe someone would have noticed, but I didn't know it before.Sql:select * FROM table where ID in (3,6,9,1,2,5,8,7);After such a situation is taken out, in fact, the ID or by 1,2,3,4,5,6,7,8,9, sorted, but if we really