First create a database table, and then perform the delete update operation in the main activity
public< /span> class MainActivity extends AppCompatActivity {
@Override
protected void
Category: Database
The database is a warehouse that organizes, stores and manages data according to the data structure. It was created more than 60 years ago. With the development of information technology and the market, especially after the 1990s, data management is no longer just It is to store and manage data, and transform it into various data management methods required by users. There are many types of databases, from the simplest tables that store various data to large-scale database systems that can store massive amounts of data. They have been widely used in all aspects.
PowerDesigner use tutorial
PowerDesigner is a very powerful modeling tool software, comparable to Rose, and it is also one of the most famous modeling software today. Rose is a modeling tool that specializes in UML object mo
PowerDesigner (4) – Business Processing Model
The original text is from: http://www.voidcn.com/article/p-rkyhvfes-oy.html
Business processing model
The Business Process Model (BPM) takes business requirements as the starting point,
How to convert Unix era in SQLite
Can you help me convert the unix era into the format yyyy-mm-dd hh:mm:ss(24h) in sqlite? (GMT 7 is very appreciated).
For example: from 1319017136629 to 4:38:56 PM GMT 7 on Wednesday, October
Use the Order By clause in the group_concat function in SQLite
I don’t think I can use the ORDER BY clause in the GROUP_CONCAT function.
Does anyone know a tricky way to implement this behavior in SQLite? ?
I have seen this question before. But I h
powerdesigner12.5
FEATURE PD_SHELL SYBASE 12.50 permanent uncounted 1 TS_OK HOSTID=ANY SIGN2=1 FEATURE PD_DEV SYBASE 12.50 permanent uncounted 1 TS_OK HOSTID=ANY SIGN2=2 FEATURE PD_DA SIGN 2= 2 FEATURE SIGN_BASE_unc
What is the priority of multiple JOIN statements in SQLITE?
To my surprise, the following two queries returned different results:
SELECT *
FROM foo
JOIN bar
ON bar.id=foo.bar_id
JOIN baz
ON baz.id=foo.baz_id
LEFT JOIN zig
ON zig.foo_id=foo.id;
PowerDesigner (8) – Object-oriented model (with example diagram, sequence diagram, class diagram, generating Java source code and Java source code generation class)
http://blog.csdn.net/conviction_thinking/article/details/7959270
In PowerDesigner, Could Not Initialize JavaVM appears! How to solve
This error will be reported when using powerdesigner to reversely generate the table structure:
Please check your environment variable configuration:
System Variables
CLASSPATH =
SQLite3 encryption
Recently, due to work reasons, I need to use the sqlite database. The sqlite database is small and easy to use, which feels pretty good. But there is a shortcoming that the database is not encrypte