2022/11/12 json格式转换对象 动态sql

@PostMapping
public Integer save(@RequestBody User user){
    return userMapper.insert(user);
}
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选择json格式。以为本人忘记选了415错误，media错误

mybatisx插件

sprinboot yml文件导入xml
mybatis:
mapper-locations: classpath:mapper/*.xml

一直报错
发现重复了
注解和xml都对同样的方法操作了

动态sql

<?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.example.demos.mapper.UserMapper">
    <update id="update">
        update sys_user
        <set>
            <if test="username != null">
                username=#{
   username},
            </if>
            <
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