随笔分类 -  Mybatis

springboot+mybatis-plus简单入门
摘要：#mybatis_plus入门 项目结构 1、pom依赖 <?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/20 阅读全文
posted @ 2022-03-30 22:30 ꧁༺星星的轨迹方程式༻꧂ 阅读(60) 评论(0) 推荐(0)
mybatis|Error building SqlSession. The error may exist in UserMapper.xml
摘要：java.lang.ExceptionInInitializerError at com.zzl.mapper.UserMapperTest.deleteUser(UserMapperTest.java:70) Caused by: org.apache.ibatis.exceptions.Pers 阅读全文
posted @ 2022-01-11 14:23 ꧁༺星星的轨迹方程式༻꧂ 阅读(720) 评论(0) 推荐(0)
mybatis02-mybatis的CRUD
摘要：1. 查询 查询所有 mapper类 public interface UserMapper { //查询所有 List<User> findAll(); } 映射xml <mapper namespace="com.zzl.mapper.UserMapper"> <select id="findA 阅读全文
posted @ 2022-01-11 13:56 ꧁༺星星的轨迹方程式༻꧂ 阅读(32) 评论(0) 推荐(0)
mybatis01-mybatis创建步骤
摘要：添加maven依赖 <!--导入Mybatis依赖--> <dependencies> <!--mysql驱动--> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <versio 阅读全文
posted @ 2022-01-10 12:50 ꧁༺星星的轨迹方程式༻꧂ 阅读(49) 评论(0) 推荐(0)
Mybatis|opening session的空指针异常
摘要：控制台错误代码 `org.apache.ibatis.exceptions.PersistenceException: Error opening session. Cause: java.lang.NullPointerException Cause: java.lang.NullPointerE 阅读全文
posted @ 2022-01-10 12:21 ꧁༺星星的轨迹方程式༻꧂ 阅读(227) 评论(0) 推荐(0)