Tag: triggers

Java triggers printer printing

import java.awt.Font; import java.awt.Graphics; import java.awt.print.Book; import java.awt.print.PageFormat; import java.awt.print.Paper; import java.awt.print.Printable; import java.awt.print.PrinterException; import java.awt.print.PrinterJob; import java.io.ByteArrayInputStream; import java.io.InputStream; import java.util.Arrays; import javax.print.Doc; import javax.print.DocFlavor; import javax.print.DocPrintJob; import javax.print.PrintService; import javax.print.PrintServiceLookup; import javax.print.SimpleDoc; import javax.print.attribute.DocAttributeSet; import javax.print.attribute.HashDocAttributeSet; import javax.print.attribute.HashPrintRequestAttributeSet; import javax.print.attribute.standard.Copies; import javax.print.attribute.standard.Sides; import javax.swing.JOptionPane; import org.slf4j.Logger; import org.slf4j.LoggerFactory; /** * Printer class * […]

Views, triggers and stored procedures

Python operates MySQL The origin of SQL: MySQL itself is a C/S architecture, with a server and a client. It comes with a client: mysql.exe The python language has become the client of MySQL (for a server, there can be many clients) Steps: 1. Connect to MySQL first host, port, username, password, charset, library, etc. […]

Python operates MySQL, SQL injection issues, views, triggers, transactions, stored procedures, built-in functions, process control, indexes

1. Python operates MySQL Import third-party module: pymysql Operation steps (text description): 1. Connect to MySQL first host, port, username, password, charset, library, autocommit, etc. 2. Write SQL statements in python 3. Start executing the SQL statement and get the result 4. Processing in python (further processing of data) Code implementation: # 1. Link mysql […]

Views, stored procedures, triggers

View View (View) is a virtual table. The data in the view does not actually exist in the database. The row and column data come from the tables used in the query of the custom view and are dynamically generated when the view is used. The view value saves the SQL logic of the query […]

[MySQL]Views, stored procedures, triggers

Article directory 1. View 1.1 Basic operations of views 1.2 Inspection options for views 1.3 View update 2. Stored procedures 2.1 Basic syntax of stored procedures 2.2 Variables 2.2.1 System variables 2.2.2 User-defined variables 2.2.3 Local variables 2.3 Keywords 2.3.1 Judgment 2.3.2 Loop 2.4 Cursor 2.5 Stored functions 3. Trigger 1. View A view is […]

[Transfer] WPF template selector DataTemplateSelector and dynamic binding, the use of DataTemplate.Triggers triggers…

In general, you should create a DataTemplateSelector if there are multiple DataTemplates available for the same type of object and you want to provide your own logic for selecting which DataTemplate to apply based on the properties of each data object. Note that you can set the DataType property on the DataTemplate if you have […]

[Transfer] Practical combat of mysql triggers (if trigger execution fails, will SQL roll back?)

1 IntroductionMysql triggers and stored procedures are both programs embedded in mysql. Triggers are a new function of mysql5. Currently, the databases used by the online Fengchao system, Beidou system, and Columbus system are all mysql5.0.45 versions. Many programs such as fc-star management terminal, sfrd (das), and dorado will use triggers. The server program implements […]

mysql-views, triggers, transactions, stored procedures, process control

Directory view trigger affairs stored procedure process control 1. View A view is a virtual table composed of query results. Just like a real table, it has named column and row data. Emphasis: The view is permanently stored, but the view stores not data, just a SQL statement View features: The columns of the view […]

Use of sql server triggers

View all triggers and status under the database SELECT a.name data table name, sysobjects.name AS trigger name, sysobjects.crdate AS creation time, sysobjects.info , sysobjects.status FROM sysobjects LEFT JOIN ( SELECT * FROM sysobjects WHERE xtype = ‘U’ ) AS a ON sysobjects.parent_obj = a.id WHERE sysobjects.xtype = ‘TR’; –type meaning /* C CHECK constraints D […]