PHP

First, javascript: Code:/*@desc：数组和对象互转类@param data 待转换的数据*/function arrobj(data){this.data = data/* @desc：对象转数组 */this.objtoarr = function(){ var data = this.data var arr = new Array() for(var i in data){ for(var j in data[i]){

For example, if the ip address of the newly added node is 192.168.1.xxx, add the hosts of 192.168.1.xxxdatanode-xxx to all nn and dn nodes, create useraddhadoop-sbinbash-m on xxx, and add the ip address of another dn. all files in ssh are copied to

This article describes some internal implementation mechanisms for Redis to process client connections, including connection processing, timeout, and buffer. Note: The content described in this article is based on Redis2.6 and later versions.

Round (multiple) multi_delkeysscan (forkvtypeonly) RedisSSDBhashmaphgethgethsethsethdelhdelhIncrByhincrhDecrBy Redis SSDB kv get set del incr/incrBy incr decr/decrBy decr getMultiple multi_get setMultiple multi_set del (multiple) multi_del keys scan

If you need to include a column in the column returned by the query statement to indicate the row number of the record in the entire result set, the method proposed by the ISOSQL: 2003 Standard is to provide the ROW_NUMBER () RANK () function.

The difference in the composition of MyISAMInnoDB: Each MyISAM is stored as three files on the disk. The name of the first file starts with the name of the table. The extension indicates the file type .. Frm file storage table definition. The data

Set the mysql service to allow Internet access and modify the mysql configuration file, some of which are my. ini, some are my. cnf [linux ]. 1: Set the mysql configuration file etcmysqlmy. cnf find the bind-address127.0.0.1 to comment it out; the

My nonsense: This article provides sample code, but does not describe the details of mapreduce on the HBase code layer. It mainly describes my one-sided understanding and experience. Recently, we have seen Medialets (Ref) share their experience in

This article is divided into four segments: 1. introduction 2. basic Architecture 3. comparison with Hive 4. i. Introduction: Google engineers have developed a Sawzall tool for MapReduce implementation. Google has published several papers online,

Solve the Problem of garbled data query on the mysql console. The figure shows that when the mysql console is gbk, the data queried is Chinese characters. If not, the data is garbled. Setnamesgbk; then the queried data is Chinese Characters Solve

Mysql provides three installation methods: binary, rpm, and source code compilation. Here we will discuss in detail how to compile and install mysql source code. After mysql 5.5, mysql no longer provides the configure compilation method. Instead, it

Mysql learning-mysql is required. 1 is required for mysql. Chapter 9 starts: regular expressions are used to match special character sets. Mysql uses the where clause to provide preliminary support for regular expressions. The keyword regexp is used

MySQL views the maximum number of connections and modifies the maximum number of connections 1. views the maximum number of connections showvariableslike % max_connections %; 2. modifies the maximum number of connections setGLOBALmax_connections200;

Mysql enables remote access to mysql-uroot-p and enters the password. Execute the following statement grantallprivilegeson *. * to 'user' @ '%' identifiedby 'Password' withgrantoption; user indicates the user name, mysql defaults to root, and

Create a calculated field in MySQL-MySQL series (v) 1. The field has the same meaning as the column. The database column is generally called a column, A field generally refers to a calculated Field 2. concatenates A spliced field to form a single

In the previous article export data from Hive to Mysql, although hbase data is successfully exported to mysql through hive, however, we encountered Chinese garbled characters. 1. mysql encoding mysqlshowvariableslikecollation _ %; + -----------------

MySQL Stored Procedure debugging tool commercial and free MySQL Stored Procedure since its birth in MySQL 5.0, has been released because there is no rich debugging tool MySQL Stored Procedure debugging tool commercial and free MySQL Stored Procedure

Install the MySQL source code in A8 ora8: blog.sina.com.cnsblog_48c95a424100e7eo.html; comment: the system development plan has changed! Discard PostgreSQL! Embrace MySQL! Of course, the premise is that BerkeleyDB is still supported as the MySQL

What file should I change the php configuration under ubuntuserver? Php. ini? Or not. Php. ini is located in the etcphp5apache2 Directory, which is the total configuration file of php. However, do not modify this file in ubuntu. The php

Char and varchar types are similar, but they are stored and retrieved in different ways. In MySQL5.0.3, their maximum length and whether to retain trailing spaces are also different. Char and varchar define the maximum length of a string. For