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

Hundreds of billions of warehouse projects (warehouse theory_ Product dimension data loading (zipper table))

Product dimension data loading (zipper table) Zipper watch design: 1. Collect the full data of the day and store it in the ND (current day) table. 2. You can take out yesterday's full data from the history table and store it in the OD (last day's data) table. 3. ND-OD is the data added and changed on ...

Posted by eagle1771 on Fri, 05 Jun 2020 06:27:04 +0200

Cases of data inconsistency caused by MySQL implicit type conversion

1.1 problem description                   . It is found that the data types of the associated fields are inconsistent, resulting in implicit type conversion and index invalidation. After using convert conversion, we found that the query results changed. Ta ...

Posted by dabbott on Fri, 05 Jun 2020 06:09:46 +0200

SOD Honey for.NET ORM--Introduction to Zero Foundations

PDF.NETThe SOD framework is not only an ORM, but its ORM function is unique. I have introduced it many times in the blog, but it is all theoretical. Many beginners may still feel complex. In fact, the ORM of SOD is very simple.Let's take a step-by-step look at the popular Code First approach. I. Preparations 1.1, add SOD package reference ...

Posted by mandrews81 on Thu, 04 Jun 2020 02:09:52 +0200