出问题的功能为：前端用ajax(axious)异步添加品牌数据报错
### Error updating database. Cause: org.apache.ibatis.executor.ExecutorException: Error getting generated key or setting result to parameter object. Cause: org.apache.ibatis.executor.ExecutorException: No setter found for the keyProperty 'id' in 'java.lang.Class'.
### The error may exist in com/example/mapper/BrandMapper.xml
### The error may involve defaultParameterMap
### The error occurred while setting parameters
### SQL: insert into tb_brand (brand_name, company_name, ordered, description, status) values (?,?,?,?,?);
### Cause: org.apache.ibatis.executor.ExecutorException: Error getting generated key or setting result to parameter object. Cause: org.apache.ibatis.executor.ExecutorException: No setter found for the keyProperty 'id' in 'java.lang.Class'.
后台添加代码没问题（注：利用自增，没setId）
BrandService brandService = new BrandService();
Brand brand = new Brand();
brand.setBrandName("波导");
brand.setCompanyName("波导手机");
brand.setOrdered(103);
brand.setDescription("手机中的战斗机");
brand.setStatus(0);
brandService.addBrand(brand);
[DEBUG] 21:16:35.469 [main] c.e.m.B.add - ==> Preparing: insert into tb_brand (brand_name, company_name, ordered, description, status) values (?,?,?,?,?);
前端提交Bean报错，最后发现为模型传递错误
brand: {
status: '',
companyName: '',
brandName: '',
id:'',
ordered:'',
description:''
},
这里id设置为""，才导致参数传递错误 id:""
应该为这样，将id设为null
brand: {
status: '',
companyName: '',
brandName: '',
id:null,
ordered:'',
description:''
},
就不会报错了
总结id:""，就会把空字符串最终传递给mapper.xml，错误接收id属性，报这样的错误：Error getting generated key
insert into tb_brand (brand_name, company_name, ordered, description, status)
values (#{brandName},#{companyName},#{ordered},#{description},#{status});
