我创建了以下示例来测试外键，到目前为止，它运行良好。我想要做的是使用我构建的这个框架来设置关系的属性并让它在保存父对象时保存子对象并自动设置主键和外键。DataManager 类公开了 Connection
public class DataManager
{
DataManager()
{
OrmLiteConfig.DialectProvider = SqliteDialect.Provider;
ConnectionString = SqliteFileDb;
updateTables();
}
private void updateTables()
{
using (var dbConn = OpenDbConnection())
{
dbConn.DropAndCreateTable<Person>();
dbConn.DropAndCreateTable<PhoneNumber>();
}
}
public static string SqliteFileDb = "~/App_Data/db.sqlite".MapAbsolutePath();
private static DataManager manager;
public static DataManager Manager {
get
{
if (manager == null)
manager = new DataManager();
return manager;
}
}
public IDbConnection InMemoryDbConnection { get; set; }
public IDbConnection OpenDbConnection(string connString = null)
{
connString = ConnectionString;
return connString.OpenDbConnection();
}
protected virtual string ConnectionString { get; set; }
protected virtual string GetFileConnectionString()
{
var connectionString = SqliteFileDb;
return connectionString;
}
}
这些是用于实现我的结果的带有 BaseClass 的 POCO：
public class Person : LiteBase
{
[AutoIncrement]
[PrimaryKey]
public int Id { get; set; }
public string Name { get; set; }
public string Surname { get; set; }
private List<PhoneNumber> numbers;
public List<PhoneNumber> PhoneNumbers {
get
{
if (numbers == null)
numbers = GetList<PhoneNumber>(p => p.Person == Id);
return numbers;
}
}
}
public class PhoneNumber
{
public string Number { get; set; }
public string Description { get; set; }
[AutoIncrement]
[PrimaryKey]
public int Id { get; set; }
[References(typeof (Person))]
public int Person { get; set; }
public void AddPerson(Person person)
{
Person = person.Id;
}
}
public class LiteBase:INotifyPropertyChanged
{
public List<T> GetList<T>(Expression< Func<T,bool>> thefunction) where T : new()
{
var objects = new List<T>();
using (var conn = Data.DataManager.Manager.OpenDbConnection())
{
objects = conn.Where<T>(thefunction);
}
return objects;
}
public T GetItem<T>(Expression<Func<T, bool>> thefunction) where T : new()
{
T obj = new T();
using (var conn = Data.DataManager.Manager.OpenDbConnection())
{
obj = conn.Where<T>(thefunction).FirstOrDefault<T>();
}
return obj;
}
public event PropertyChangedEventHandler PropertyChanged;
[NotifyPropertyChangedInvocator]
protected virtual void OnPropertyChanged(string propertyName)
{
PropertyChangedEventHandler handler = PropertyChanged;
if (handler != null)
handler(this, new PropertyChangedEventArgs(propertyName));
}
}
创建 Person 和 PhoneNumber 对象的简单类
public class PersonManager
{
public void CreatePerson(string name, string surname, string number)
{
using (var conn = DataManager.Manager.OpenDbConnection())
{
var pnum = new PhoneNumber { Number = number };
var person = new Person
{
Name=name,
Surname = surname,
};
conn.Save<Person>(person);
var id = conn.GetLastInsertId();
person.Id = (int)id;
pnum.AddPerson(person);
conn.Save<PhoneNumber>(pnum);
}
}
public List<Person> GetPeople()
{
List<Person> people;
using (var conn = DataManager.Manager.OpenDbConnection())
{
people = conn.Select<Person>();
}
return people;
}
public List<PhoneNumber> GetNumbers()
{
List<PhoneNumber> numbers;
using (var conn = DataManager.Manager.OpenDbConnection())
{
numbers = conn.Select<PhoneNumber>();
}
return numbers;
}
}
这是用法：
var manager = new PersonManager();
manager.CreatePerson("John", "Doe", "12345679");
manager.CreatePerson("Jack", "Smith", "12345679");
manager.CreatePerson("Peter", "Jones", "12345679");
manager.CreatePerson("Dan", "Hardy", "12345679");
var people = manager.GetPeople();
var numbers = manager.GetNumbers();
for (int i = 0; i < people.Count; i++)
{
Console.WriteLine("{0} {1} {2}",
people[i].Name,people[i].Surname,people[i].Id);
}
for (int n = 0; n < numbers.Count; n++)
{
Console.WriteLine("PN: {0} {1}",
numbers[n].Number,numbers[n].Person);
}
for (int p = 0; p < people.Count; p++)
{
var person = people[p];
Console.WriteLine("{0}: {1} {2} {3}",
person.Id,person.Name,person.Surname,person.GetItem<PhoneNumber>(x=>x.Person==person.Id).Number);
}
输出如我所料：
约翰·多伊 1
杰克史密斯 2
彼得琼斯 3
丹·哈代 4
电话：12345679 1
电话：12345679 2
电话：12345679 3
电话：12345679 4
1：约翰·多伊 12345679
2：杰克史密斯 12345679
3：彼得·琼斯 12345679
4：丹哈迪12345679
我真正想做的是以下几点：
var john = new Person
{
Name = "John",
Surname = "Smith",
PhoneNumber = new PhoneNumber { Number = "123456789" }
};
conn.Save<Person>(john);
var number = john.PhoneNumber.Number
这是可能吗？