SQLite case 1: using SQLiteDatabase to operate database and table

SQLite case 1: using SQLiteDatabase to operate database and table 1, Operation effect 2, Implementation steps 1. Create an Android Application SQLiteDatabaseDemo 2. Prepare the background picture background.jpg and copy it to the mipmap directory under res 3. Main layout resource file activity main.xml &lt ...

Posted on Tue, 05 May 2020 04:59:05 -0400 by maff20

Build ShowDoc document tool

Preparing the Nginx + PHP environment Install Nginx Install Nginx using yum: yum -y install nginx Modify the /etc/nginx/nginx.conf file as follows: user nginx; worker_processes auto; error_log /var/log/nginx/error.log; pid /run/nginx.pid; include /usr/share/nginx/modules/*.conf; events { worker_connections 1024; } http { lo ...

Posted on Mon, 04 May 2020 02:16:38 -0400 by aaronhall

The configuration and use of mysql database in flash

1, Create database Create the database needed by the project in advance through the command line tool Note: remote login permission is required for database #1. Log in to the database: mysql -uusername -p #2. Create a new login user: create user newname identified by 'password'; #3. Remote login authorizati ...

Posted on Fri, 01 May 2020 06:46:12 -0400 by lucasmontan

Android datastore notes - SQLite database

I recently used this SQLite local database in my project, so I wrote a blog to summarize it, hoping it can also help Xiaobai When to use SQLite SharedPreferences is a lightweight data storage method. When saving data, it actually stores key value pairs, similar to Map. Storage location: / data/data / application package name / shared_prefs ...

Posted on Thu, 30 Apr 2020 15:18:46 -0400 by thesmartone

DataAnalysis - read local data

1, TXT file operation Read all import numpy as np import pandas as pd txt_filename = './files/python_wiki.txt' # Open file file_obj = open(txt_filename,'r') # Read the entire file all_content = file_obj.read() # Close file file_obj.close() print (all_content) Python is a widely used high-level, general-purpose, interpreted, dynamic progra ...

Posted on Wed, 15 Apr 2020 10:04:20 -0400 by kslagdive

Decryption algorithm of wechat database

Decryption algorithm of wechat database on pc and Android There is an article about the password generation algorithm of Android wechat database, which is not mentioned here The password production algorithm on the pc side is encrypted in memory. Interested friends can see how the password is generated ...

Posted on Sun, 05 Apr 2020 18:02:35 -0400 by swissmissflash

Android advanced - how to use SQLite

Learn how to use SQLite (1) What is SQLite? Concept: ① A lightweight database; ② It takes up only a few hundred kilos of memory; ③ It can be used without user name and password, which is insecure. (2) How to use SQLite? Steps: 1. Create database and data table New class inherits SQLiteOpenHelper Implem ...

Posted on Sun, 05 Apr 2020 12:57:15 -0400 by ChrisMayhew

PyQt5 - 04 logic is separated from the interface and sqlite3+hashlib is used to implement the login interface

Use pyqt5+sqlite3+hashlib module to realize the encrypted login interface with database, and separate the logic and interface. Database generation Generate a sqlite database. The reason for using sqlite here is that it is simple and does not need to be deployed. You can replace the database and corresponding modules accordin ...

Posted on Thu, 02 Apr 2020 03:57:49 -0400 by Spud_Nic

iOS simple query operation based on FMDB

Reprinted from: https://blog.csdn.net/rpf2014/article/details/53116906 The last article introduced the operation of installation, addition, deletion, modification and query of FMDB This article is mainly about data query screening and common database statistical functions, which is convenient for later query and learni ...

Posted on Tue, 31 Mar 2020 08:28:31 -0400 by wayz1229

About kafka monitoring tool

Summary Apache Kafka is a fast, scalable, high-throughput, fault-tolerant distributed "publish subscribe" message system, written in Scala and Java language, which can deliver messages from one endpoint to another. Compared with traditional message middleware (such as ActiveMQ, RabbitMQ), Kafka has the characteristics of high throug ...

Posted on Fri, 20 Mar 2020 04:04:07 -0400 by jeev