Freaks City

Problem Description When executing MyBatis mapper methods, the folowing exception occurs: org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.builder.BuilderException: Error evaluating expression '_clause.operator.alias'. Cause: org.apache.ibatis.ognl.OgnlException: source is null for getProperty(null, "opera ...

Database Schema CREATE TABLE daily_life ( id_card VARCHAR(20) PRIMARY KEY, eating TINYINT, bathing TINYINT, grooming TINYINT, dressing TINYINT, bowel_ctl TINYINT, bladder_ctl TINYINT, toileting TINYINT, transfer TINYINT, ambulation TINYINT, stair_climb TINYINT ); ...

System Functionality Overview The pet hospital management system built with Spring Boot supports multiple user roles with configurable permissions. Key features include: User management and role assignment Permission control system Pet profile management Medical case tracking Health guide management Health analytics and charting Pet activity l ...

MyBatis is an open-source Java persistence framework that simplifies data base interactions by reducing JDBC boilerplate code. It supports custom SQL, stored procedures, and advanced mappings. This article covers basic CRUD operations using annotations, XML mappings, and dynamic SQL. Basic CRUD with MyBatis Start by creating a Spring Boot pr ...

Database Schema Overview Before implementing the code examples, it's essential to understand the database table structure that we'll be working with. Many-to-One Relationships For our examples, we'll consider a PostContent table (primary key) as the "many" side and a Post table as the "one" side. Appproach 1: Cascade Propert ...

Project Dependencies To integrate Apache Shiro into a Spring Boot environment using Gradle, include the necessary starters for web support, MyBatis, and the Shiro core libraries. Below is the configuration for build.gradle: plugins { id 'org.springframework.boot' version '2.7.5' id 'io.spring.dependency-management' version '1.0.15.RELEA ...

MyBatis serves as a powerful persistence framework that facilitates custom SQL queries, stored procedures, and sophisticated object-relational mapping. It eliminates the need for extensive JDBC boilerplate code, including manual parameter binding and result set handling. Configuration and mapping of native types, interfaces, and Plain Old Java ...

Why InputStream Doesn't Need Manual Closure When Using SqlSessionFactoryBuilder? Consider this typical usage pattern: public class StudentRepositoryImpl implements IStudentRepository { private SqlSession session; public void addStudent(Student student) { try { InputStream stream = Resources.getResourceAsStream(& ...

Define an interface that declares the query method. package com.example.mapper; import com.example.model.Employee; import java.util.Collection; public interface EmployeeMapper { Collection<Employee> retrieveAllEmployees(); } Create a XML mapping file that links the interface method to an SQL statement. <?xml version="1.0&quo ...

There is a common scenario where a project built solely on MyBatis must later incorporate MyBatis-Plus. Even though the goal appears to be "coexistence," MyBatis-Plus is effectively a superset of MyBatis, so the more practical path is switching to MyBatis-Plus and eliminating MyBatis’s dedicated configuration. The steps below describe ...