Programmer Group

When there is time, we need the server to silently perform scheduling tasks in the dead of night. Scheduling tasks based on java tomcat are done in two ways (personally): 1. Implementing the ServletContextListener class 1.SysContextListener class (configuration task timing scan) 1 package com.srba.task; 2 3 4 import java.util.Timer;//Tim ...

I. Database-related operations 1. Database Configuration (1) Default global database configuration Set up the global database configuration information in the application/database.php file. The basic definition information of the database is as follows: return [ // Database type 'type' => 'mysql', // server ...

I. Review Alipay plug-in source download address: Click Download           Part One This article introduces the use of Alipay plug-in for payment, full refund, partial refund and multi store configuration of plug-ins. This paper introduces how to implement it. II. Pre-preparation Plug-ins have three main functions: Multi-Store Plug-in Config ...

In the last chapter, we explained how to improve query efficiency by lazy loading of mybatis. What other methods can improve query efficiency besides lazy loading? This is the cache we talked about in this chapter. mybatis provides us with a first-level cache and a second-level cache, which can be understood by the following figure: 　　 Fir ...

When this Case happened, I was out of town, and the project manager managed to solve it. I'll sort it out and share it with you. Problem phenomenonWe need to expand a table space under Oracle DB, but when executing the expansion command, Oracle reported the following error:ORA-00059 : maximum number of DB_FILES exceeded Error Reporting Interp ...

brief introduction Gorm is one of the more ORM s used in the development of the Go language.It has a full range of functions: crud Association (contains one, contains many, belongs to, many-to-many, contains many) callback functions are available before and after CallBacks (create, save, update, delete, query find) Preload affair composite pri ...

Batch operation can send a number of SQL statements to the database at one time, thus reducing the network communication with the database server and improving the execution efficiency. When executing SQL statements in large quantities, there are three factors affecting efficiency: 1: Transactions, the more transactions, the slower the speed ...

It only allows you to modify a part of the page, of course, this "part" is determined by you. Artists first make a page, and then we use it as a template. (Note that this template does not need to use EditRegion3 code, which Dreamwerver designed to facilitate their own logo.) Replace the template with a character that can be distingui ...

1. Purpose of this paper Android ContentProvider provides a mechanism for data exchange between processes. and data base The query of the query is the application of this mechanism. So what is Cursor that app gets by querying the database through Uri? Why can we provide data for another process? In this paper, getContentResolver().query( ...

background In the first two monthly reports, we share the method of implementing audit log function with SQL Server in June. Finally, we get the best option Extend Event from five aspects: reliability, object level, maintainability, overhead and impact on database system. In July monthly report, we quantitatively analyze the performance and swa ...