我想不出向模型添加关联的最佳方法。我有以下结构typeBeerstruct{IDuint`json:"id"`Namestring`json:"name"gorm:"notnull;"sql:"unique"`Descriptionstring`json:"description"gorm:"notnull;"`ImageURLstring`json:"image_url"`AlcoholContentfloat64`json:"alcohol_content,default:0"`Featuredbool`json:"featured"`BrewStarttime.Time`json
我是关系数据库的新手，我阅读的所有Material都涵盖了主键和外键、正常形式和联接，但没有在数据库创建后填充它。如何导入CSV文件以使字段与其相关表相匹配？假设您要建立一个啤酒数据库，并且有一个CSV文件，每一行都作为一条记录。Header:brewer,beer_name,country,city,state,beer_category,beer_type,alcohol_contentRecord1:Anheuser-Busch,Budweiser,UnitedStates,St.Louis,Mo,Palelager,Regular,5.0%Record2:Anheuser-Bu
我正在尝试使我的响应类通用。问题是它返回一个com.google.gson.internal.LinkedTreeMap类型的列表，而不是Brewer类型。启动这一切的函数:ListbrewerList=null;try{ResponseresponseHandler=newResponse();brewerList=responseHandler.getAll(response);functionCallBack=Constants.FUNCTION_DB_BREWER;list=brewerList.toArray(newBrewer[brewerList.size()]);}ca
1.R自带颜色image.png2.RColorBrewerlibrary(RColorBrewer)?RColorBrewerbrewer.pal(n,name)display.brewer.pal(n,name)display.brewer.all(n=NULL,type="all",select=NULL,exact.n=TRUE,colorblindFriendly=FALSE)brewer.pal.infoAccent8Dark28Paired12Pastel19Pastel28Set19Set28Set312display.brewer.pal(11,"PiYG")display.
1.R自带颜色image.png2.RColorBrewerlibrary(RColorBrewer)?RColorBrewerbrewer.pal(n,name)display.brewer.pal(n,name)display.brewer.all(n=NULL,type="all",select=NULL,exact.n=TRUE,colorblindFriendly=FALSE)brewer.pal.infoAccent8Dark28Paired12Pastel19Pastel28Set19Set28Set312display.brewer.pal(11,"PiYG")display.
