The Way of Linux Learning (2)

4.Linux file search tool. Linux often uses locate and find as file lookup commands.Find can be thought of as a command that comes with the system and has a lot of functions, but it is a bit cumbersome to use.Find finds real-time file data, which is generally used to query files with a clear understanding of the file directory and file name, and ...

Posted on Sat, 18 May 2019 20:43:01 -0700 by cry of war

Android Official Database Room - Data Call

Links to source documents data calling DAO can be used to query and store data. DAOs for these columns use important components of Room, and each DAO provides abstract data manipulation methods. When using DAO operation, without using query builder or direct query, different components can be divided according to their own d ...

Posted on Sat, 18 May 2019 14:09:05 -0700 by Design

Lucene is that simple

What is Lucene? Lucene is an open source full-text search engine toolkit published by apache Software foundation, written by senior full-text search expert Doug Cutting. It is a full-text search engine architecture, providing a complete index creation and query index, as well as some text analysis engines. Lucene aims to provide a simple an ...

Posted on Sat, 18 May 2019 13:52:43 -0700 by designergav

MongoDB Series - Linux Installation of MongoDB

I. Download and Unzip MongoDB Download Address: https://www.mongodb.com/download-center#community [root@localhost src]# wget https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-3.4.10.tgz [root@localhost src]# tar -zxvf mongodb-linux-x86_64-3.4.10.tgz [root@localhost src]# mv mongodb-linux-x86_64-3.4.10 /usr/local ...

Posted on Sat, 18 May 2019 11:09:36 -0700 by mkosmosports

Greenplum 6 has been merged into PostgreSQL version 9.3 - 8 times read, 195 times update, delete, and a lot of new PG features over the previous generation of GP

Label PostgreSQL, Greenplum, 6, gin, asynchronous transactions background Greenplum 6 has been merged into PostgreSQL version 9.3 - with 5 performance improvements: 8 times read, 195 times update and delete - and a large number of new PG features, as detailed in PostgreSQL release notes https://www.postgresql.org/docs/11/static/release.html ...

Posted on Sat, 18 May 2019 10:47:13 -0700 by rokchik

flask-Nissan Website Construction-Database Operation

Introduction: I want to use python's flask framework to build a daily material website, mainly including web architecture, static pages, background system, interaction. At present, the home page has been copied, not the front end is too slow and too slow. Knowledge in this section: database operation, model table building, update database. pyth ...

Posted on Sat, 18 May 2019 02:35:07 -0700 by adamata

ODBC Configuration and Code

The database job needs to use ODBC interface, but there are different opinions on the Internet, and some methods are not useful after trying, so send out your own configuration process~ 1,ODBC: The ODBC (Open Database Coonnectivity) standard defines an API that applications use to open a database connection, send queries ...

Posted on Fri, 17 May 2019 23:00:52 -0700 by zzman

Solving Operation Overflow Problem

## - When querying a database, because of the large amount of data to be queried and the level of millions, memory overflow often occurs. Therefore, all data in the database tables need to be processed in batches. The easiest way is to use paging query statements: MIMIT statements of MySQL meet this requirement. - Let ...

Posted on Fri, 17 May 2019 20:17:06 -0700 by PcGeniusProductions

Notes on javaUtils Encapsulation and Three-tier Architecture

1. What is a three-tier architecture? 3-tier architecture usually divides the whole business application into three layers: User Interface layer, Business Logic Layer and Data access layer. The purpose of differentiating levels is for the idea of "high cohesion and low coupling". In software architecture design, hierarchical structure ...

Posted on Fri, 17 May 2019 18:49:59 -0700 by bocasz

MyBatis Basic Usage

Simple use of MyBatis Let me start by describing what MyBatis is: MyBatis is one of the three main frameworks in java for interacting with databases The bottom level is jdbc, so let's simply state the benefits of MyBatis! Easy to master, unified management of SQL statements, writing in xml files and so on.... Mybatis ...

Posted on Fri, 17 May 2019 17:27:02 -0700 by qwave