是否通过wcf发送这些仿制药服务的智能或虚假方式？ 我的目标是我不想为每个实体编写此服务合同，并且每个实体都要编写此服务合同。非常感谢。
嗯，为什么不呢？
让我们尝试以下操作：
这个接口是必要的，因为它会识别可以通过您的Repository.I使用不知道你的你的T实体的实施或您CRUD操作是如何工作的对象;但是，如果您没有涉及它，我们也将添加方法GetPrimaryKeys。
public interface IRepositoryEntry
{
IList<String> GetPrimaryKeys();
}
所以，现在我们需要一个仓库，因为你最关心的是，你不想重新编写代码，你应该尝试这样的事：
这个实现意味着，无论我们的数据库条目，它们必须支持默认的构造函数。这是本该接口的实现很重要：
public interface IRepository<T> where T : IRepositoryEntry, new()
{
event EventHandler<RepositoryOperationEventArgs> InsertEvent;
event EventHandler<RepositoryOperationEventArgs> UpdateEvent;
event EventHandler<RepositoryOperationEventArgs> DeleteEvent;
IList<String> PrimaryKeys { get; }
void Insert(T Entry);
void Update(T Entry);
void Delete(Predicate<T> predicate);
bool Exists(Predicate<T> predicate);
T Retrieve(Predicate<T> predicate);
IEnumerable<T> RetrieveAll();
}
现在，我们将让我们的服务：
[ServiceContract]
public interface IDbRepository
{
[OperationContract]
object Insert(object entity);
[OperationContract]
object Update(object entity);
}
通知没有仿制药？这很重要。现在我们需要为我们的Repository创建一个实现。我将给出两个，一个用于Memory，因此可以完成单元测试，另一个用于数据库。
public class OracleRepository
{
const string User = "*";
const string Pass = "*";
const string Source = "*";
const string ConnectionString = "User Id=" + User + ";" + "Password=" + Pass + ";" + "Data Source=" + Source + ";";
public static IDbConnection GetOpenIDbConnection(){
//Not really important; however, for this example I Was using an oracle connection
return new OracleConnection(ConnectionString).OpenConnection();
}
protected IEnumerable<String> GetEntryPropertyNames(Type type){
foreach (var propInfo in type.GetProperties())
yield return propInfo.Name;
}
}
public class OracleRepository<T> : OracleRepository,IDisposable, IRepository<T> where T : IRepositoryEntry, new()
{
#region Public EventHandlers
public event EventHandler<RepositoryOperationEventArgs> InsertEvent;
public event EventHandler<RepositoryOperationEventArgs> UpdateEvent;
public event EventHandler<RepositoryOperationEventArgs> DeleteEvent;
#endregion
#region Public Properties
public IList<String> PrimaryKeys{ get { return primaryKeys.AsReadOnly(); } }
public IList<String> Properties { get; private set; }
public String InsertText { get; private set; }
public String UpdateText { get; private set; }
public String DeleteText { get; private set; }
public String SelectText { get; private set; }
#endregion
#region Private fields
List<String> primaryKeys;
IDbConnection connection;
IDbTransaction transaction;
bool disposed;
#endregion
#region Constructor(s)
public OracleRepository()
{
primaryKeys = new List<String>(new T().GetPrimaryKeys());
Properties = new List< String>(GetEntryPropertyNames(typeof(T))).AsReadOnly();
SelectText = GenerateSelectText();
InsertText = GenerateInsertText();
UpdateText = GenerateUpdateText();
DeleteText = GenerateDeleteText();
connection = GetOpenIDbConnection();
}
#endregion
#region Public Behavior(s)
public void StartTransaction()
{
if (transaction != null)
throw new InvalidOperationException("Transaction is already set. Please Rollback or commit transaction");
transaction = connection.BeginTransaction();
}
public void CommitTransaction()
{
using(transaction)
transaction.Commit();
transaction = null;
}
public void Rollback()
{
using (transaction)
transaction.Rollback();
transaction = null;
}
public void Insert(IDbConnection connection, T entry)
{
connection.NonQuery(InsertText, Properties.Select(p => typeof(T).GetProperty(p).GetValue(entry)).ToArray());
if (InsertEvent != null) InsertEvent(this, new OracleRepositoryOperationEventArgs() { Entry = entry, IsTransaction = (transaction != null) });
}
public void Update(IDbConnection connection, T entry)
{
connection.NonQuery(UpdateText, Properties.Where(p => !primaryKeys.Any(k => k == p)).Concat(primaryKeys).Select(p => typeof(T).GetProperty(p).GetValue(entry)).ToArray());
if (UpdateEvent != null) UpdateEvent(this, new OracleRepositoryOperationEventArgs() { Entry = entry, IsTransaction = (transaction != null) });
}
public void Delete(IDbConnection connection, Predicate<T> predicate)
{
foreach (var entry in RetrieveAll(connection).Where(new Func<T, bool>(predicate)))
{
connection.NonQuery(DeleteText, primaryKeys.Select(p => typeof(T).GetProperty(p).GetValue(entry)).ToArray());
if (DeleteEvent != null) DeleteEvent(this, new OracleRepositoryOperationEventArgs() { Entry = null, IsTransaction = (transaction != null) });
}
}
public T Retrieve(IDbConnection connection, Predicate<T> predicate)
{
return RetrieveAll(connection).FirstOrDefault(new Func<T, bool>(predicate));
}
public bool Exists(IDbConnection connection, Predicate<T> predicate)
{
return RetrieveAll(connection).Any(new Func<T, bool>(predicate));
}
public IEnumerable<T> RetrieveAll(IDbConnection connection)
{
return connection.Query(SelectText).Tuples.Select(p => RepositoryEntryBase.FromPlexQueryResultTuple(new T(), p) as T);
}
#endregion
#region IRepository Behavior(s)
public void Insert(T entry)
{
using (var connection = GetOpenIDbConnection())
Insert(connection, entry);
}
public void Update(T entry)
{
using (var connection = GetOpenIDbConnection())
Update(connection, entry);
}
public void Delete(Predicate<T> predicate)
{
using (var connection = GetOpenIDbConnection())
Delete(connection, predicate);
}
public T Retrieve(Predicate<T> predicate)
{
using (var connection = GetOpenIDbConnection())
return Retrieve(connection, predicate);
}
public bool Exists(Predicate<T> predicate)
{
using (var connection = GetOpenIDbConnection())
return Exists(predicate);
}
public IEnumerable<T> RetrieveAll()
{
using (var connection = GetOpenIDbConnection())
return RetrieveAll(connection);
}
#endregion
#region IDisposable Behavior(s)
public void Dispose()
{
Dispose(true);
GC.SuppressFinalize(this);
}
#endregion
#region Protected Behavior(s)
protected virtual void Dispose(Boolean disposing)
{
if(disposed)
return;
if (disposing)
{
if(transaction != null)
transaction.Dispose();
if(connection != null)
connection.Dispose();
}
disposed = true;
}
#endregion
#region Private Behavior(s)
String GenerateInsertText()
{
String statement = "INSERT INTO {0}({1}) VALUES ({2})";
//Do first entry here becasse its unique input.
String columnNames = Properties.First();
String delimiter = ", ";
String bph = ":a";
String placeHolders = bph + 0;
//Start @ 1 since first entry is already done
for (int i = 1; i < Properties.Count; i++)
{
columnNames += delimiter + Properties[i];
placeHolders += delimiter + bph + i;
}
statement = String.Format(statement, typeof(T).Name, columnNames, placeHolders);
return statement;
}
String GenerateUpdateText()
{
String bph = ":a";
String cvpTemplate = "{0} = {1}";
String statement = "UPDATE {0} SET {1} WHERE {2}";
//Can only set Cols that are not a primary Keys, Get those Columns
var Settables = Properties.Where(p => !PrimaryKeys.Any(k => k == p)).ToList();
String cvp = String.Format(cvpTemplate, Settables.First(), bph + 0);
String condition = String.Format(cvpTemplate, PrimaryKeys.First(), bph + Settables.Count);
//These are the values to be set | Start @ 1 since first entry is done above.
for (int i = 1; i < Settables.Count; i++)
cvp += ", " + String.Format(cvpTemplate, Settables[i], bph + i);
//This creates the conditions under which the values are set. | Start @ 1 since first entry is done above.
for (int i = Settables.Count + 1; i < Properties.Count; i++)
condition += " AND " + String.Format(cvpTemplate, PrimaryKeys[i - Settables.Count], bph + i);
statement = String.Format(statement, typeof(T).Name, cvp, condition);
return statement;
}
String GenerateDeleteText()
{
String bph = ":a";
String cvpTemplate = "{0} = {1}";
String statement = "DELETE FROM {0} WHERE {1}";
String condition = String.Format(cvpTemplate, PrimaryKeys.First(), bph + 0);
for (int i = 1; i < PrimaryKeys.Count; i++)
condition += " AND " + String.Format(cvpTemplate, PrimaryKeys[i], bph + i);
statement = String.Format(statement, typeof(T).Name, condition);
return statement;
}
String GenerateSelectText()
{
String statement = "SELECT * FROM {0}";
statement = String.Format(statement, typeof(T).Name);
return statement;
}
#endregion
#region Destructor
~OracleRepository()
{
Dispose(false);
}
#endregion
}
在存储器操作的第二实现是这样的：
public class InMemoryRepository<T> : IRepository<T> where T : IRepositoryEntry, new()
{
//RepositoryEntryBase,
public event EventHandler<RepositoryOperationEventArgs> InsertEvent;
public event EventHandler<RepositoryOperationEventArgs> UpdateEvent;
public event EventHandler<RepositoryOperationEventArgs> DeleteEvent;
public IList<String> PrimaryKeys { get; protected set; }
List<T> data;
public InMemoryRepository()
{
PrimaryKeys = new List<String>(new T().GetPrimaryKeys());
data = new List<T>();
}
public void Insert(T Entry)
{
if (Get(Entry) != null)
throw new Exception("Duplicate Entry - Identical Key already exists");
data.Add(Entry);
if (InsertEvent != null)
InsertEvent(this, new RepositoryOperationEventArgs() { Entry = Entry });
}
public void Update(T Entry)
{
var obj = Get(Entry);
if (obj == null)
throw new Exception("Object does not exist");
obj = Entry;
if (UpdateEvent != null)
UpdateEvent(this, new RepositoryOperationEventArgs() { Entry = obj });
}
public void Delete(Predicate<T> predicate)
{
data.RemoveAll(predicate);
if (DeleteEvent != null)
DeleteEvent(this, new RepositoryOperationEventArgs() { Entry = null });
}
public bool Exists(Predicate<T> predicate)
{
return data.Exists(predicate);
}
public T Retrieve(Predicate<T> predicate)
{
return data.FirstOrDefault(new Func<T, bool>(predicate));
}
public IEnumerable<T> RetrieveAll()
{
return data.ToArray();
}
T Get(T Entry)
{
//Returns Entry based on Identical PrimaryKeys
Type entryType = typeof(T);
var KeyPropertyInfo = entryType.GetProperties().Where(p => PrimaryKeys.Any(p2 => p2 == p.Name));
foreach (var v in data)
{
//Assume the objects are identical by default to prevent false positives.
Boolean AlreadyExists = true;
foreach (var property in KeyPropertyInfo)
if (!property.GetValue(v).Equals(property.GetValue(Entry)))
AlreadyExists = false;
if (AlreadyExists)
return v;
}
return default(T);
}
}
呼，这是一个很大的代码。现在有一些非标准功能。这些是什么，他们都是：
public static class IDbConnectionExtensions
{
public static IDbCommand CreateCommand(this IDbConnection Conn, string CommandText, params object[] Parameters)
{
var Command = Conn.CreateCommand();
Command.CommandText = CommandText;
foreach (var p in Parameters ?? new object[0])
Command.Parameters.Add(Command.CreateParameter(p));
return Command;
}
public static IDbDataParameter CreateParameter(this IDbCommand Command, object Value)
{
var Param = Command.CreateParameter();
Param.Value = Value;
return Param;
}
public static PlexQueryResult Query(this IDbConnection conn, String CommandText, params object[] Arguments)
{
using (var Comm = conn.CreateCommand(CommandText, Arguments))
using (var reader = Comm.ExecuteReader(CommandBehavior.KeyInfo))
return new PlexQueryResult(reader);
}
public static int NonQuery(this IDbConnection conn, String CommandText, params object[] Arguments)
{
using (var Comm = conn.CreateCommand(CommandText, Arguments))
return Comm.ExecuteNonQuery();
}
public static IDbConnection OpenConnection(this IDbConnection connection)
{
connection.Open();
return connection;
}
}
现在，我们如何整合实验很简单，这一次我写了我的头，没有编辑器的顶部，请多多包涵：
让说我们有以下类从IRepostoryEntry继承：
//Feel free to ignore RepostoryEntryBase
public class COMPANIES : RepositoryEntryBase, IRepositoryEntry
{
public string KEY { get; set; } //KEY VARCHAR2(20) N
public int COMPANY_ID { get; set; } //COMPANY_ID NUMBER(10) N
public string DESCRIPTION { get; set; }//DESCRIPTION VARCHAR2(100) N
public COMPANIES() : base()
{
primaryKeys.Add("COMPANY_ID");
}
}
public abstract class DbRepository : IDbRepository
{
public Dictionary<Type,IRepository> Repositories { get;set; }
public DbRepository(){
Repositories = new Dictionary<Type,IRepository>();
Repositories .add(typeof(COMPANIES)),new OracleRepository<COMPANIES>());
}
public object Insert(object entity)
{
if(!(entity is IRepositoryEntry))
throw new NotSupportedException("You are bad and you should feel bad");
if(!Repositories.ContainsKey(entity.GetType()))
throw new NotSupportedException("Close but no cigar");
Dictionary[entity.GetType()].Insert(entity);
}
//You can add additional operations here:
}
那一定是我写过的最长的答案： 我建this DLL让我跳开始上存储数据的方法;不过，它的确是为Oracle设计的。这就是说，它很容易适应你的需求。
不是真的 - WCF是一个基于XML的消息传递系统，它支持任何可以用XML模式表达的东西。不幸的是，XML模式不支持泛型。 WCF只能处理具体类型 - 没有界面，没有泛型 - 真的。 –
你应该看看WCF数据服务。 –
感谢您的回复marc_s我也读过关于这个主题的其他答案，我知道没有这种方式可以通过wcf发送泛型，我试图找到的是一些调整，使得这些通用服务关闭而不写入每个实体。 – ThomasBecker