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The content of the content 1. Database connection pool * concept and function         * C3P0         * Druid * Custom JDBC tool class     2. Spring JDBC : JDBC Template 3. Transaction control in Srping##Database connection pool 1. Concept: in fact, it is a container (Collection) for database connecti ...

OB Jun: good news! "Oceanbase version 2.2" is officially launched on the official website! (click to read the original text and download it directly) OceanBase 2.2 is a stable version that successfully supports tmall double 11 in 2019, and it is also the version used for TPC-C testing and ranked first in TPC-C performance. We will con ...

SQL Prompt is a practical SQL syntax prompt tool. It searches automatically according to the object name, syntax and code fragment of the database, and provides users with appropriate code selection. Automatic script settings make code easy to read - especially useful when developers are not familiar with scripts. This article describes not to ...

Original address: http://www.work100.net/training/monolithic-architecture-design-patterns-factory-pattern.htmlMore Tutorials: Beam Cloud - Free Course Factory Mode Sequence Number Intratext chapters video 1 Summary - 2 Realization - See the navigation section above for reading 1. Overview Factory Pattern is one of the most common des ...

Author: Wei Xinping, the 5th MySQL practical class student of zhishutang, the 10th MySQL optimization class student, now works as a teaching assistant. Maximum length of varchar(n) and char(n) I believe that as a dba, it is often asked this question. What is the maximum length. How many bytes or how many characters. In fact, this is not very ...

Article directory 1. Basic concepts of full synchronous replication (Group replication) 1.1 group replication model: 1.2 group replication principle: 2. Realize group replication server1: (initiating node) Configure on server2 and server3: Test: 1. Basic concepts of full synchronous replicat ...

NDB cluster installation introduce https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-basics.html NDBCLUSTER (also known as NDB )Is a memory storage engine that provides high availability and data persistence. Of NDBCLUSTER The storage engine can be configured with a range of failover and load balancing options, but the simplest is to start ...

The traditional database technology based on single machine has been unable to support the access processing of massive data. In this case, the database cluster gausdb 100, which supports the high expansion of the system and strong consistency of the sub database and sub table Sharding architecture, came into being. It is a distributed system ...

1 problem description Using the Scrapy framework, complete the collection of bidding information on the Internet. The collection fields are as follows: 2 Tips for problem solving Some pages of the Internet must be logged in to get response. You need to log in manually and get the Cookie value in t ...

1. Database Constraints 1.1 NULL constraint When creating a table, you can specify that a column is not empty: -- Reset student table structure DROP TABLE IF EXISTS student; CREATE TABLE student ( id INT NOT NULL, sn INT, name VARCHAR(20), qq_mail VARCHAR(20) ); 1. ...