Tag: cascade

Cascade.MERGE is finally tested successfully

There is a many-to-many relationship between User and Role. Just use Cascade.MERGE for cascade. Role will have some initial data saved when the system starts, and can be added again. User can be bound to these Roles. Role will not be affected when User is deleted. Below is the relevant code for the experiment, which […]

Solution: OpenCV Error: Assertion failed (!empty()) in cv::CascadeClassifier::detectMultiScale,

Table of Contents Solution: OpenCV Error: Assertion failed (!empty()) in cv::CascadeClassifier::detectMultiScale Failed to load classifier file: File is empty: OpenCV version is incompatible: Missing dependent libraries: Practical application scenarios: Solution: OpenCV Error: Assertion failed (!empty()) in cv::CascadeClassifier::detectMultiScale Recently, in the process of using OpenCV for face detection, I encountered an error: “OpenCV Error: Assertion failed […]

Java exports to excel with two-level cascade verification

import java.io.FileOutputStream; import java.util.HashMap; import java.util.Map; import org.apache.poi.ss.usermodel.Cell; import org.apache.poi.ss.usermodel.DataValidation; import org.apache.poi.ss.usermodel.DataValidationConstraint; import org.apache.poi.ss.usermodel.Name; import org.apache.poi.ss.usermodel.Row; import org.apache.poi.ss.usermodel.Sheet; import org.apache.poi.ss.usermodel.Workbook; import org.apache.poi.ss.util.CellRangeAddressList; import org.apache.poi.util.IOUtils; import org.apache.poi.xssf.usermodel.XSSFDataValidation; import org.apache.poi.xssf.usermodel.XSSFDataValidationConstraint; import org.apache.poi.xssf.usermodel.XSSFDataValidationHelper; import org.apache.poi.xssf.usermodel.XSSFSheet; import org.apache.poi.xssf.usermodel.XSSFWorkbook; public class ExcelDemo2 { public static void main(String[] args) { Cascade(); } public static void Cascade() { String fileName = “test02.xlsx”; […]

mysql keys, data constraints in database tables (PRIMARY KEY, UNIQUE, NOT NULL, DEFAULT, CHECK, FOREIGN KEY) composite primary key constraints, unique constraints, default constraints, check constraints, foreign key constraints. cascade

Let’s first look at the explanation of the results of the desc xxx table in mysql: The “Field” column displays the name of each field (i.e., column) of the table. The “Type” column shows the data type of each field. The “Null” column indicates whether the field can be NULL. If the field does not […]

MARSIM/cascadePID_node.cpp

1. Main functions of the code The main function is: Cascade PID controller controls quadcopter drone. Subscribe to the odom and cmd_pose topics to get the current state and desired pose of the drone. It then uses the cascaded PID controller to calculate the required motor speed and publishes it to the cmd_RPM topic. 2. […]

QT cmake cc cascade pcl magic modification project

Table of Contents 1. Origin: 2. cmake compilation of qt 1. The final directory is as follows: 2. Related cmakelist modifications 3. Activation of qpcl 3. Magic modification of actual code 1.cc plug-in and UI transformation 2.MainWindow.cpp 3. Display of point cloud files 4.Finally integrated into your own project 4. Summary: 1.QT 64-bit error 0xc000007b. […]

Spring boot+MyBatis implements five-table cascade query (implemented through annotations!!!)

Table of Contents Business scene Entity design General idea Abstraction into code implementation Summarize The summary is in one step, if you don’t want to see the implementation! ! ! Business Scenario After the user clicks to enter a certain package, he needs to find out the inspection group included in the package, what inspection […]

CF1864D Matrix Cascade

Go to Luogu to read my blog Ideas The first thing that comes to mind is violence, because the words in the same line do not affect each other, so the words in the first line 1 1 1 must be operated, then update the subsequent status, and then operate all the operations in the […]