1.1 arithmetic operators
1.2 comparison operators
operatormeaning=Equal to<>And ~ are not equal>=Greater than or equal to>greater than<=Less than or equal to<less than
2 exercise part 1 - query
2.1 writing the product table
The SQL code is as foll ...
Posted by jzimmerlin on Mon, 20 Sep 2021 03:45:43 +0200
1. Add read-write permission
1.1. Dynamic permission granting (calling encapsulated methods)
2. Get music files( MainActivity.java )
2, Music.java (entity class)
Apply for access to SD card
Drop down refresh
package cn.wang ...
Posted by jack_indigo on Sun, 31 May 2020 06:46:28 +0200
The previous four articles introduced an excellent framework SqlSugar developed by domestic developers, which gave us a bright feeling in front of our eyes. In this article, we will try another ORM framework, Dapper, which has a relatively high audience rating.
Dapper is a lightweight ORM framework, which is characterized by high spe ...
Posted by hip_hop_x on Wed, 27 May 2020 05:53:48 +0200
In flask, many people prefer to operate the database through SQLAlchemy. In this case, it is recommended to use package instead of module to split the data model into a separate module. Such an approach is not necessary, but more reasonable.
Because SQLAlchemy is a general database abstracti ...
Posted by rahulephp on Fri, 01 May 2020 09:57:19 +0200
get find default non ID
Different api versions are not used
Filter current user
Multi parameter use
_exact equals like 'aaa'
__iexact is exactly the same as ig ...
Posted by cmccomas on Thu, 02 Apr 2020 06:27:41 +0200
Reprinted from: https://www.jianshu.com/p/124a2e4e8c42
Upgrading the database is a very tedious and seemingly troublesome thing. In an interview, the interviewer asked about adding fields to update the database and upgrading it. I replied that I could make a database migration copyEvery time I judge the updat ...
Posted by kalinkap on Mon, 30 Mar 2020 22:49:24 +0200
Talk about the code generator, some technical solutions, details
In order to simplify the code and generate template code, we have code generator.
The premise of code generator is that there are already some templated and standardized code. Such as general DAO layer, S ...
Posted by cfemocha on Tue, 07 Jan 2020 02:41:56 +0100
First, let's talk about why there is a ContentProvider?
When an application wants to access the database of another application, because each application's database file is private and cannot be accessed directly, the accessed application needs an external database content provider, that is, content provider.
Posted by xxxxxx on Sat, 21 Dec 2019 22:30:36 +0100
Strongly Recommend Articles: Welcome to CollectionAndroid Dry Goods Sharing
Read for five minutes, ten o'clock a day, and study with you for life. Here's Android, a programmer.
This article mainly introduces some knowledge points in Android development. By reading this article, you will gain the following contents:
Inheriting SQLiteOpenHelp ...
Posted by lillyapps on Tue, 06 Aug 2019 11:27:59 +0200