Mybatis Source Interpretation--Data Source Module (Factory Mode)

The data source module for Mybatis is located inOrg.apache.ibatis.datasource. Common data source components are implementedJavax.sql.DataSourceInterface.Within Mybatis, third-party data source components are integrated, and data source implementations are provided.In general, data source initializat ...

Posted by sane993 on Wed, 17 Jun 2020 02:59:26 +0200

xtrabackup for MySQL database backup

Mysqldump is a logical backup method. Its biggest defect is that the speed of backup and recovery is slow. For a database less than 50G, this speed is acceptable. But if the database is very large, it is not suitable to use mysqldump backup again. At this time, you need a kind of easy-to-use and efficient tool. Xtrabackup is one of them, known ...

Posted by motofzr1000 on Tue, 16 Jun 2020 10:20:51 +0200

On Jetpack -- ROOM database

On Jetpack(1) - ViewModelOn Jetpack(2) - LifecyclesOn Jetpack(3) - LiveDataDemo project Although Android carries SQLite, its operation is troublesome, and if it is a large-scale project, it will become confusing and difficult to maintain, unless you design a very good architecture and package. Of cour ...

Posted by Runnion on Tue, 16 Jun 2020 05:22:09 +0200

10-3 B1-5 query customer's order

Find the order status of the customer, which is displayed as: customer ID, company name, order ID, employee ID select customers.CustomerID,customers.CompanyName,orders.OrderID,orders.EmployeeID from customers,orders where orders.CustomerID=customers.CustomerID and orders.ShipCity=customers.City ord ...

Posted by shortysbest on Tue, 16 Jun 2020 04:20:18 +0200

Ten suggestions for Java exception handling

Preface Ten suggestions for Java exception handling, I hope to help you ~ This article has been uploaded to github: https://github.com/whx123/Jav... Public number: A little boy collecting snails First, try not to use e.printStackTrace(), but to use log printing. Counterexamples: try{ // do what you want }catch(Exception e){ e.printStackTr ...

Posted by sheilam on Mon, 15 Jun 2020 18:07:36 +0200

Mysql enable slow query and log analysis

1, Why open slow query Most of the reasons for the poor query performance are the large amount of data. To start the slow query of mysql and record the SQL statements that take a long time to query in the log is conducive to our better position and optimization. 2, Several common reasons for the ...

Posted by bg on Sun, 14 Jun 2020 05:47:10 +0200

[Huawei Cloud Technology Sharing] Database Development: MySQL Seconds_Behind_Brief Master Analysis

[Summary] For mysql primary and standby instances, seconds_behind_master is an important parameter to measure the delay between master and slave.Seconds_can be obtained by executing "show slave status;" on slaveBehind_The value of master. Seconds_Behind_Master For mysql primary and standby instances, seconds_behind_master is an impor ...

Posted by heldenbrau on Fri, 12 Jun 2020 06:20:43 +0200

pikachu range clearance WP

pikachu range clearance WP brute force Brute force solution based on form Verification code bypass (on server) Verification code bypass (on client) token anti explosion? Cross-Stie Scripting Reflective xss(get) Reflective xss(post) Storage xss Dom xss Dom xss-x XSS blind play XSS filtering htmls ...

Posted by Delaran on Thu, 11 Jun 2020 09:42:01 +0200

JSON type of new MySQL 5.7 features

With the wide application of NOSQL database, the extensible storage mode also has a good support in relational database. A new data type, JSON, has been added in MySQL 5.7   JSON data type meaning In fact, without the support of JSON data type, we can save the data in this format by varchar type or text type, but why do we need to specifica ...

Posted by poppy on Wed, 10 Jun 2020 08:47:33 +0200

How to use Node+MySQL+express to add, delete, modify and query

First of all, thank you for this little sister's video: Bili bilibili - very poor female programmer   List structure attached: 1, Development preparation Node installation and configuration MySQL installation and configuration Database visualization tools: Navcat Interface t ...

Posted by ukspudnie on Tue, 09 Jun 2020 07:08:23 +0200