使用JayData进行基本数据存储 [英] Basic data storage with JayData

问题描述

我尝试实现我的第一个基于JayData的应用程序。我需要我的HTML5 / JavaScript应用程序来存储客户端的复杂数据（主要是一对多关系）。

I try to implement my first JayData based application. I need my HTML5/JavaScript app to store complex data client-side (mostly one-to-many relations).

我的模型看起来像这样（对不起，如果名字是不太明确）：

My model looks like this (sorry if the names are not very explicit):

我试图用JayData翻译它，如果我错了，请纠正我：

I've tried to translate it with JayData, correct me if I'm wrong:

$data.Entity.extend("Test", {
    Id: { type: "int", key: true, computed: true },
    Name: { type: "string", required: true, maxLength: 200 },
    Chapters: { type: Array, elementType: "Chapter", inverseProperty: "Test" }
});

$data.Entity.extend("Chapter", {
    Id: { type: "int", key: true, computed: true },
    Name: { type: String, required: true, maxLength: 200 },
    Test: {type: "Test", inverseProperty: "Chapters" },
    Checks: { type: Array, elementType: "Check", inverseProperty: "Chapter" }
});

$data.Entity.extend("Check", {
    Id: { type: "int", key: true, computed: true },
    Name: { type: String, required: true, maxLength: 200 },
    Status: { type: "int", required: true },
    Chapter: { type: Chapter, inverseProperty: "Checks" }
});

$data.EntityContext.extend("CheckDb", {
    Tests: { type: $data.EntitySet, elementType: Test },
    Chapters: { type: $data.EntitySet, elementType: Chapter },
    Checks: { type: $data.EntitySet, elementType: Check }
});

编辑

如何填写所有表格？首先，我尝试过：

How to fill all tables? To start, I've tried:

var myDB = new CheckDb({ 
    name: 'local', databaseName: 'CheckDatabase'
});

myDB.onReady(function() {
    myDB.Tests.add({
        Name: "Test 1"
    });
    myDB.saveChanges();
});

但是如果我想添加章节和检查到我的测试？

But what if I want to add Chapters and Checks to my Test?

谢谢

推荐答案

好的，我终于找到了它自己：

Okay I've finally found it by myself:

myDB.onReady(function() {
    var check = new Check({Name: "Check 1", Status: 1});
    var chapter = new Chapter({Name: "Chapter 1"});
    chapter.Checks = new Array();
    chapter.Checks.push(check);

    var myTest = myDB.Tests.add({
        Name: "Test 1",
        Chapters: [chapter]
    });
    myDB.saveChanges();
});

这并不难：）

这篇关于使用JayData进行基本数据存储的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！