Web SQL(javascript)是否有任何ORM框架？

Question

任何人都知道现在是否有一个可用或将来不久？

Answer 1

有一个名为JayData库的新文件,这个类似于JavaScript平台的EntityFramework(或NHibernate):提供JavaScript语言查询(JSLQ)和JavaScript CRUD.还支持模型定义,navigationProperties和1..1.0,1..m,m..n关系.

我复制了一个关于如何使用它的简短代码:

//define storage model: Department and Employee in a 1..m relation

$data.Entity.extend("$org.types.Department", {
  Id: { type: "int", key: true, computed: true },
  Name: { type: "string", required: true },
  Address: { type: "string" },
  Employees: { type: "Array", elementType: "$org.types.Employee", inverseProperty:"Department" }
});


$data.Entity.extend("$org.types.Employee", {
  Id: { type: "int", key: true, computed: true },
  FirstName: { type: "string", required: true },
  LastName: { type: "string", required: true }, 
  Department: { type: "$org.types.Department", inverseProperty:"Employees"}
});

$data.EntityContext.extend("$org.types.OrgContext", {
  Department: { type: $data.EntitySet, elementType: $org.types.Department },
  Employee: { type: $data.EntitySet, elementType: $org.types.Employee }
});

您可以针对OrdContext及其中的集合进行编码.以下行将创建一个由本地WebSQL支持的上下文实例(您有其他选项,如indexeddb或OData)

var context = new $org.types.OrgContext({ name: "webSql", databaseName: "OrgDB" });

添加一些数据

var department = new $org.types.Department({ Name: 'Finance', Employees: [] });

var emp1 = new $org.types.Employee({ FirstName: 'John', LastName: 'Smith'});
department.Employees.push(emp1);

var emp2 = new $org.types.Employee({ FirstName: 'Jane', LastName: 'Smith'});
emp2.Department = department;

context.add(department);
context.add(emp2);

context.saveChanges();

现在您在商店中有数据,您可以查询它.实体字段支持JSLQ查询,以及指向m..1方向的导航字段.(在版本1.0中,您无法直接对抗1..m navProperties.您可以使用in表达式来规避此问题

//filter
context.Employees
  .filter( function(emp) { return emp.LastName == 'Smith' })
  .toArray(...);

//filter
context.Employees
  .filter( function(emp) { return emp.FirstName.startsWith('J') ||
                                  emp.LastName.toLowerCase.contains('mith') })
  .toArray(...);

//filter2
context.Employees
  .filter( function(emp) { return emp.Department.Id == 1 })
  .toArray( function(emps) { } );

//filter2 + eager load
context.Employees
  .include("Department")
  .filter( function(emp) { return emp.Department.Id == 1 })
  .toArray( function(emps) { } );


//map/project
context.Employees
  .filter( function(emp) { return emp.Department.Id == 1 }).toArray(...)
  .map( function(emp) { return { EmployeeName: emp.FirstName + emp.LastName, 
                                DepartmentName: emp.Department.Name }})
  .forEach( function(item) { ... })

Answer 2

我正在寻找同样的东西。这似乎是一个很小的选择。对我来说最有前途的是persistence.js。Impel看起来也不错，但不幸的是，它看起来已经有一年半没有更新了。ActiveRecord.js最终可能会成功，但它们似乎还不支持 Web SQL。希望有人会发布更多选项。