MongoDB

1. Check all recordsCopy the code code as follows:Db.userInfo.find ();Equivalent:select* from UserInfo;The default is 20 records per page, and you can query the next page of data with the IT iteration command when the display is not displayed. Note:

First find MongoDB's official website http://docs.mongodb.org/master/tutorial/install-mongodb-on-ubuntu/?_ga= 1.104487360.1319058345.1434008003Configuring the Public key sudo apt-key adv--keyserver hkp://keyserver.ubuntu.com:80--recv 7f0ceb10echo

Preface: Daughter-in-law asked to be sent up. I want the first page of this article.1,nuget introduced MongoDB. Then the namespaceUsing mongodb.bson;using mongodb.driver;using mongodb.driver.builders;using MongoDB.Driver.Linq;2, Global

First, Environment construction About the environment, the best way to build, of course, is the script one-click Build I am here to build on CENTOS6 x64 version of Linux, this Linux version should now be the standard version of most mainstream

Integrated configuration of 1.Spring integrated MongoDBIf you are using a MAVEN project, add a package dependency. Dependency> groupId>Org.springframework.datagroupId> Artifactid>Spring-data-mongodbArtifactid>

Find () statementstart the MongoDB service because MongoDB does not start with the system, and it may take a short period of time for the following commands to start to complete. sudo service MongoDB startEnter the MongoDB command line operator

Converts column data separated by commas in a column into a function for displaying row data. This is an example of a string segmentation function. select to_number (strvalue) as Value from table (fn_split ('1, 2, 3 ', ',') select to_char (strvalue)

Dellshareplex and HVR data replication software Today I have a general understanding of Dell shareplex data replication software, web site: http://software.dell.com/products/shareplex/ You can see from this URL,Shareplex is the source and only

One-click excel Export How to export an excel file with one click Public function input (){ Ob_end_clean (); // clear the buffer to avoid garbled characters. Header ("Content-Typ: text/html; charset = UTF-8 "); Vendor ('excel. PHPExcel. Writer.

How many bytes does VARCHAR2 occupy? NLS_LENGTH_SEMANTICS, nls_languageORACLE initialization parameter: NLS_LENGTH_SEMANTICS The initialization parameter NLS_LENGTH_SEMANTICS is used to specify the length definition method for the CHAR or VARCHAR2

Data cleansing Note: Full-angle numeric Conversion   Background] When you insert a numeric field to the target end, an error is returned, indicating that the type is incorrect. Check that the data is indeed number, but the result is a "fullwidth"

Filter conversion can be optimized at one time There is a problem with SQL Performance. When a filter is found in the execution plan, you should be careful when it comes to it. Like nestloop, my previous blog has studied it.Explore the filter

Data cleansing Note: correct English date conversion reports "invalid month" Background] Data in the format of "9-jun14" must be converted when it is saved to the date format field. However, an error "invalid month" is reported for a standard date.

Rhel5.8ISOyum source configuration [Root @ lei1 mnt] # mkdir/mnt/iso [root @ lei1 mnt] # mkdir/mnt/cdrom [root @ lei1 ~] # Mv rhel-server-5.8-x86_64-dvd.iso/mnt/iso [root @ lei1 ~] # Cd/mnt/iso [root @ lei1 iso] # lltotal 4032884-rw-r -- r -- 1 root

Write redis scripts togetherI. redis script Environment To write redis scripts, we should first set up its script environment. Redis uses lua as its scripting language. Therefore, building a lua environment becomes the first priority. Environment:

Mutual conversion of SCN timestampsSQL> select * from v $ version where rownum = 1;BANNER--------------------------------------------------------------------------------Oracle Database 11g Enterprise Edition Release 11.2.0.1.0-ProductionSQL>!

Gridcontrol11.1.0.1 Installation Guide Grid control 11.1.0.1 Installation Guide Get startedSystem Version[Root @ gridcontrol ~] # Lsb_release-LSB Version: base-4.0-amd64: base-4.0-noarch: core-4.0-amd64: core-4.0-noarch: graphics-4.0-amd64: graphics-

Storage and file managementStorage and file management Purpose (1) master the creation and management of tablespaces. (2) master the management operations such as viewing and modifying the tablespace under the OEM. (3) master the creation,

MongoDB database update and deletion documentationCreate a collection createCollection () name: the name of the created set. options: an initialized document (optional) db. createCollection ("jingdong") # No parameter {"OK": 1}> show

Redis memory management code comment Zmalloc. h /* Zmalloc-total amount of allocated memory aware version of malloc () ** Copyright (c) 2009-2010, Salvatore Sanfilippo * All rights reserved. ** Redistribution and use in source and binary forms,