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On infinite class The first option: Recursion algorithm is also the most frequently used, and most open source programs do the same, but generally only use four levels of classification. The database structure design of this algorithm is the simplest. A field ID and a field FID (parent id) in the category table. In this way, we can judge the up ...

0. Directory 1,JDBC 2. Import the jar package of MySQL JDBC for the project 3. Initialize driver 4. Establish a connection to the database 5. Create Statement 6. Execute SQL statement 7. Close connection 8. Use try with resource to automatically close the connection 9. Reference link 1,JDBC JDBC ...

1, Introduction After the product goes online, our data is very important. It's not allowed to be lost. We should be well prepared. If one day is hacked or deleted maliciously, it will crash. So we need to do full backup and incremental backup for our online database regularly. For example, make incre ...

The keyword "delimiter" is used to declare the delimiter of SQL statement and tell mysql interpreter whether the command has ended and whether mysql can be executed. By default, delimiter is a semicolon;. In the command line client, if a line of commands ends with a semicolon, mysql will execu ...

  View CREATE/ALTER/DROP VIEW ViewName as SELECT(...) You can continue to create a view based on it, that is, you can place the previously created view as a table name in the select statement of the new view Format data using views (that is, reassemble and stitch fields) CREATE VIEW View_player_team AS SELECT CONCAT(player_name, '(' , t ...

Oracle's complete process of creating tablespaces, users I often use Oracle in my work and study process. Due to lack of experience and skills, Baidu is required every time.Now let's summarize how Oracle created users and share them with you.( Here I will paste the sql statement directly. When using it, I can copy and paste it directly. / ...

In today's article, I want to talk about an important topic that every DBA should know: how to perform page level restore operations in SQL Server. Suppose you have a damaged page in SQL Server. You want to restore only the page in question from the latest database backup, not the entire database. 1 ...

My first ASP.NET Project summary Recently, I was busy at the end of the term and didn't have time to update my blog. Here's one I'll do for myself ASP.NET Project (equipment management system) to summarize, the page template is the master, which greatly reduces the amount of code. Finally, the source code and database of the project are atta ...

Re operate the old c + + business and get used to the usual database operation mode, so take the time to encapsulate a C + + version of JSON orm. Now it supports sqlit3 and mysql, and postgres is ready. Design ideas Our general ORM, the basic pattern is to want to break away from the database, almost all in the programming language level model, ...

How to use Jdbc and Servlet to operate Mysql database and write Android login server? 1. Download and install Tomcat server 2. Open eclipse and choose Java EE mode 3. Configure Servers 1. Click on the blue word in the bottom configuration box (2) Select the corresponding versions of Apache and Tomcat in the server type (3) ...