一些注解的使用

 

@RequestParam

@RequestParam的作用相当于  request.getParameter(“参数名”)  

@RequestMapping(value = "/modifyNumber", method = RequestMethod.PUT)
void modifyNumber(@RequestParam("id") Long id,@RequestParam("number") Integer number) {
		
	roleService.modifyNumber(id, number);
}

@PathVariable

@PathVariable的作用是可以识别url中的参数

@RequestMapping(value = "/get/{id}", method = RequestMethod.GET)
Result get(@PathVariable("id") Long id) {
	RoleDto roleDto = roleClient.get(id);
	RoleResult roleResult = passportAssemble.buildParam(roleDto);
	return Result.OK(roleResult);
}

@Param

mapper类中不加@param注解可能导致报错：Parameter 'number' not found. Available parameters are [0, 1, param1, param2]

void modifyNumber(@Param("id")Long id, @Param("number")Integer number);

也可以通过参数传递的顺序解决：

<update id="modifyNumber" >
	UPDATE role SET
	 	number=#{1}
	WHERE
        ID = #{0}
</update>

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