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       
(Showing Draft Content)

数据管理器

数据管理器是一个强大的本地数据引擎,它向服务器端发送请求,然后在数据准备就绪时将数据绑定到表中。

数据管理器与数据库交互,使用GC.Data.DataManager类来管理(排序、筛选、分组、聚合)并同步实时数据, 返回数据库。使用addTableaddRelationship方法 来创建表和表之间的关联关系。同样,也可以使用DataManager类来移除关系或关联关系。

数据管理器作为TableSheet的数据核心,允许它更多地关注业务逻辑和呈现。支持远程源,如REST API、OData、GraphQL,以及JSON对象数组、CSV字符串或XML等本地源来创建表。

数据源模式

添加数据源以定义数据表时,可以提供数据模式,它包含以下属性:

属性 描述
type

string

使用的数据类型,支持JSON,CSV,XML,columnJson,默认类型为JSON。

countPath

string

用于获取数据源集合长度。
dataPath

string



用于在解析后获取数据源集合。
columns

GC.Data.IColumnCollection



数据源表的列定义。它的键是列名,值是列信息,包含dataType、dataPattern、dataMap。

下面的代码示例演示如何为TableSheet设置数据架构。

var dataManager = spread.dataManager();
var customerTable = dataManager.addTable("customerTable", {
    remote: {
        read: {
            url: apiUrl
        }
    },
    // 数据源模式 - 这里设置了dataType、 dataPattern、 dataMap等。
    schema: {
        columns: {
            validFrom: { dataType: "date" },
            billToCustomer: { dataMap: { "Tailspin Toys (Head Office)": "Tailspin Toys(HO)", "Wingtip Toys (Head Office)": "Wingtip Toys(HO)" } },
            buyingGroup: { dataMap: { "Tailspin Toys": "TT", "Wingtip Toys": "WT" } },
            postalCode: { dataType: "number" }
        }
    }
});