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mapper接口 public interface EmpMapper { List<Emp> getEmp(Emp emp); } mapper.xml <?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE mapper PUBLIC "-//myba 阅读全文
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实体类 package org.example.entity; import java.util.List; public class Dept { private Integer deptId; private String deptName; private List<Emp> emps; pu 阅读全文
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mybatis懒加载全局配置 <settings> <setting name="mapUnderscoreToCamelCase" value="true"/> <!--开启懒加载(开启延迟加载)--> <setting name="lazyLoadingEnabled" value="true" 阅读全文
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创建数据库t_emp和t_dept 创建对应实体类 package org.example.entity; public class Emp { private Integer empId; private String empName; private Integer age; private S 阅读全文
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创建表t_emp 定义实体类 package org.example.entity; public class Emp { private Integer empId; private String empName; private Integer age; private String gende 阅读全文
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处理字段名和属性名不一致的情况： mybatis-config.xml配置 <settings> <setting name="mapUnderscoreToCamelCase" value="true"/> </settings> 阅读全文
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实体类 package org.example.entity; public class User { private Integer id; private String name; private int age; private String gender; private String em 阅读全文
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mapper接口 public void deleteUser(@Param("ids") String ids); mapper.xml <delete id="deleteUser"> delete from t_user where id in (${ids}) </delete> 测试代码 阅读全文
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public User queryUserByLike(@Param("arg") String arg); 方式一： <select id="queryUserByLike" resultType="org.example.entity.User"> select * from t_user wh 阅读全文
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返回User类型的list <select id="queryAllUser" resultType="org.example.entity.User"> select * from t_user </select> public interface UserMapper { public void 阅读全文