Tag: validation

Data verification: Spring Validation

Spring Validation Overview During development, we often encounter the need for parameter verification. For example, when a user registers, it is necessary to verify that the user name cannot be empty, the length of the user name does not exceed 20 characters, the mobile phone number is in a legal mobile phone number format, etc. […]

spring boot validation use

spring-boot-starter-validation is a module used in Spring Boot to support data validation. It is built on the Java Validation API (JSR-380) and provides a convenient way to validate data in applications. Here is the basic way to use spring-boot-starter-validation: Quick Start 1. Add dependencies: In your Spring Boot project’s pom.xml file, add the following dependencies: […]

Which one is better? Fluent Validation and Data Annotations

Table of Contents What is smooth verification Introduction benefit Common scenarios What is data annotation A brief introduction to data annotation Advantages of data annotation Advanced usage of data annotations Use cases for data annotation Compare the difference Code Organization Complexity Handling Customizability Complexity Comparison: Ease of Use vs. Flexibility Smooth verification Data annotation Performance […]

An in-depth explanation of data binding validation in WPF

In-depth explanation of data binding verification in WPF WPF provides a verification function when the user inputs. Usually verification is implemented in the following two ways: Throws an error in the data object. Usually an exception is thrown during property setting, or the INotifyDataErrorInfo or IDataErrorInfo interface is implemented in the data class. Define validation […]

Use Spring Validation to verify parameters

I don’t know how you write the parameter verification of the controller layer in your usual business development process? Is there such a direct judgment as below? public String add(UserVO userVO) {<!– –> if(userVO.getAge() == null){<!– –> return “Age cannot be empty”; } if(userVO.getAge() > 120){<!– –> return “Age cannot exceed 120”; } if(userVO.getName().isEmpty()){<!– –> […]

spring-boot-starter-validation reference documentation

spring-boot-starter-validation reference document Introduce dependencies Common annotations Most annotations `NotNull` `NotEmpty` `AssertFalse` `AssertTrue` `DecimalMax` `DecimalMin` `Digits` `Email` `Future` `Max` `Min` `Negative` `NegativeOrZero` `NotBlank` `Null` `Past` `Pattern` `Positive` `PositiveOrZero` `Size` `ScriptAssert` `Length` `Range` `URL` `CreditCardNumber` Example error message template: Example of method parameter verification: Nested verification example: Group verification example: Manually trigger verification `Spring boot` configuration […]

Sklearn cross validation and binary tree drawing

1. Import of related databases and preliminary preparation for binary tree drawing Calling the make_blobs function is mainly to generate classification or clustering data sets n_features indicates how many feature values each sample has n_sample represents the number of samples Centers are the number of cluster center points, which can be understood as the number […]

Solving ModuleNotFoundError: No module named sklearn.cross_validation

Table of Contents Solving ModuleNotFoundError: No module named sklearn.cross_validation problem analysis Solution Version compatibility considerations Summarize Solving ModuleNotFoundError: No module named sklearn.cross_validation When developing machine learning projects, we often use scikit-learn, a powerful machine learning library. However, sometimes we will encounter a ??ModuleNotFoundError?? error when importing the ??sklearn.cross_validation?? module, indicating that the module cannot be […]

Pmdarima implements univariate time series prediction and cross-validation

Table of Contents 1. pmdarima implements univariate time series forecasting 2. Time series cross-validation 2.1 Rolling Cross Validation (RollingForecastCV) 2.2 Sliding window cross-validation (SildingWindowForecastCV) 1. pmdarima implements univariate time series prediction Pmdarima is a Python timing analysis library developed and encapsulated based on statsmodel and autoarima. It is also one of the timing prediction libraries […]