关于myBatis的问题There is no getter for property named 'USER

现在流行的 ssm(spring + struts2 + myBatis) 持久层的mybatis是需要配置映射器的,找了个demo连接的数据库是mysql 于是就修改了一下弄成了连接oracle的

一切就绪之后跑起来执行插入操作的时候问题来了 ,报了一个这个错我的表是B 字段是id ,user_name ,password 实例类的字段是 id , userName,password,

这里有个user_name 和userName 搞了一下午弄的头疼,后来发现了猫腻,

There is no getter for property named 'USER_NAME' in 'class com.bky.model.B'

代码:

实体类 B

package com.bky.model;public class B {private Long id;private String userName;private String password;public Long getId() {return id;}public void setId(Long id) {this.id = id == null ? null : id;}public String getUserName() {return userName;}public void setUserName(String userName) {this.userName = userName;}public String getPassword() {return password;}public void setPassword(String password) {this.password = password == null ? null : password.trim();}
}

映射器.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" ><mapper namespace="com.bky.dao.BMapper" ><resultMap id="BaseResultMap" type="com.bky.model.B" ><id column="ID" property="id" jdbcType="INTEGER" /><result column="USER_NAME" property="userName" jdbcType="VARCHAR" /><result column="PASSWORD" property="password" jdbcType="VARCHAR" /></resultMap><sql id="Base_Column_List" >ID, USER_NAME, PASSWORD</sql><insert id="insertSelective" parameterType="com.bky.model.B" >insert into B ( USER_NAME,PASSWORD) values(#{USER_NAME,jdbcType=VARCHAR},#{password,jdbcType=VARCHAR}) </insert> <update id="updateByPrimaryKey" parameterType="com.bky.model.B" > update B set USER_NAME = #{USER_NAME,jdbcType=VARCHAR}, PASSWORD = #{PASSWORD,jdbcType=VARCHAR} where id = #{id,jdbcType=INTEGER} </update> <select id="getAll" resultMap="BaseResultMap"> SELECT * FROM B </select>
</mapper>

错误写法如下

<insert id="insertSelective" parameterType="com.bky.model.B" >
insert into B ( USER_NAME,PASSWORD) values(#{USER_NAME,jdbcType=VARCHAR},#{password,jdbcType=VARCHAR})
</insert>

我们重点关注一下这里user_name 是个表字段和
后面的#{USER_NAME,jdbcType=VARCHAR} 这里错了应该
写成#{userName,jdbcType=VARCHAR} 应该是属性值
啊找的好苦啊一下午就这样浪费了不过还是解决了 ,
一开始百度了很多有的人是属性名写错了,有的是没有set/get
总结到此分享一下有此情况错误的一般就这几种了希望可以帮助到初学者

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关于myBatis的问题There is no getter for property named 'USER_NAME' in 'class com.bky.model.实例类'

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