/// <summary>
/// 返回单个实体
/// </summary>
/// <typeparam name="TEntity"></typeparam>
/// <returns></returns>
public TEntity ToFirstDefault <TEntity>()
where TEntity : Entity
{
TEntity t = ToFirst <TEntity>();
if (t == null)
{
t = DataUtils.Create <TEntity>();
}
return(t);
}
/// <summary>
/// 返回清空Web页面的值的脚本
/// </summary>
/// <typeparam name="TEntity"></typeparam>
/// <param name="prefix"></param>
public static string SetDocumentValueClearString <TEntity>(string prefix)
where TEntity : Entity
{
StringBuilder script = new StringBuilder();
script.AppendLine();
TEntity t = DataUtils.Create <TEntity>();
Dictionary <Field, object> fieldvalues = DataUtils.FieldValueToDictionary(t.GetFields(), t.GetValues());
foreach (KeyValuePair <Field, object> fieldvalue in fieldvalues)
{
string varname = prefix + fieldvalue.Key.PropertyName;
script.Append("var ");
script.Append(varname);
script.Append("=document.getElementById('");
script.Append(varname);
script.Append("');if(");
script.Append(varname);
script.Append(")");
if (null == fieldvalue.Value || Convert.IsDBNull(fieldvalue.Value))
{
script.Append(varname);
script.Append(".value='';");
}
else
{
Type valueType = fieldvalue.Value.GetType();
if (valueType == typeof(bool))
{
script.Append("{try{");
script.Append(varname);
script.Append(".checked=false");
script.Append(";}catch(err){");
script.Append(varname);
script.Append(".value='0'}}");
}
else
{
script.Append(varname);
script.Append(".value='';");
}
}
}
return(script.ToString());
}
/// <summary>
/// 返回T
/// </summary>
/// <returns></returns>
private static TEntity getTEntity <TEntity>()
where TEntity : Entity
{
var typestring = typeof(TEntity).ToString();
if (_entityList.ContainsKey(typestring))
{
return((TEntity)_entityList[typestring]);
}
lock (LockObj)
{
if (_entityList.ContainsKey(typestring))
{
return((TEntity)_entityList[typestring]);
}
var t = DataUtils.Create <TEntity>();
_entityList.Add(typestring, t);
return(t);
}
}
/// <summary>
/// 实体赋值
/// </summary>
/// <typeparam name="TEntity"></typeparam>
/// <param name="toEntity">被赋值实体</param>
/// <param name="fromEntity">来源实体</param>
/// <returns>返回null 就表示fromEntity==null</returns>
public static void SetValue <TEntity>(TEntity toEntity, TEntity fromEntity)
where TEntity : Entity
{
if (null == fromEntity)
{
toEntity = null;
}
else
{
if (null == toEntity)
{
toEntity = DataUtils.Create <TEntity>();
}
toEntity.Attach();
PropertyInfo[] pis = toEntity.GetType().GetProperties();
foreach (PropertyInfo pi in pis)
{
DataUtils.SetPropertyValue(toEntity, pi, DataUtils.GetPropertyValue <TEntity>(fromEntity, pi.Name));
}
}
}
public static List <T> Map <T>(IDataReader reader)
{
if (reader == null || reader.IsClosed)
{
throw new Exception("连接已关闭！");
}
#region Not use the cache for the time being 2015-06-14
//if (m_CatchMethod == null)
//{
// m_CatchMethod = new Dictionary<string, DynamicMethod>();
//}
#endregion
Type itemType = typeof(T);
T t = DataUtils.Create <T>();
var key = itemType.FullName;
//if (!m_CatchMethod.ContainsKey(key))//Not use the cache for the time being 2015-06-14
//{
#if WRITE_FILE
AssemblyName aName = new AssemblyName("DynamicAssembly");
AssemblyBuilder ab = AppDomain.CurrentDomain.DefineDynamicAssembly(aName, AssemblyBuilderAccess.RunAndSave);
ModuleBuilder mb = ab.DefineDynamicModule(aName.Name, aName.Name + ".dll");
TypeBuilder tb = mb.DefineType("DynamicType", TypeAttributes.Public);
#endif
Type listType = typeof(List <T>);
Type objectType = typeof(object);
Type objArrayType = typeof(object[]);
Type boolType = typeof(bool);
Type[] methodArgs = { typeof(IDataReader) };
MethodInfo LAdd = listType.GetMethod("Add");
PropertyInfo[] properties = null;
getMapped(t, itemType, reader, out properties);
#if WRITE_FILE
MethodBuilder dm = tb.DefineMethod("ReadEntities", MethodAttributes.Public | MethodAttributes.Static, listType, methodArgs);
#else
DynamicMethod dm = new DynamicMethod("ReadEntities", listType, methodArgs, typeof(Mapper));
#endif
ILGenerator ilg = dm.GetILGenerator();
//List<T> list;
LocalBuilder list = ilg.DeclareLocal(listType);
//T item;
LocalBuilder item = ilg.DeclareLocal(itemType);
//object[] values;
LocalBuilder values = ilg.DeclareLocal(objArrayType);
//object objValue;
LocalBuilder objValue = ilg.DeclareLocal(objectType);
//type nulls
LocalBuilder[] typeNulls = null;
initNulls(properties, ilg, out typeNulls);
Label exit = ilg.DefineLabel();
Label loop = ilg.DefineLabel();
Label[] lblArray = new Label[properties.Length * 2];
for (int i = 0; i < lblArray.Length; i++)
{
lblArray[i] = ilg.DefineLabel();
}
//list = new List<T>();
ilg.Emit(OpCodes.Newobj, listType.GetConstructor(Type.EmptyTypes));
ilg.Emit(OpCodes.Stloc_S, list);
//values=new object[FieldCount];
ilg.Emit(OpCodes.Ldc_I4, reader.FieldCount);
ilg.Emit(OpCodes.Newarr, objectType);
ilg.Emit(OpCodes.Stloc_S, values);
// while (arg.Read()) {
ilg.MarkLabel(loop);
ilg.Emit(OpCodes.Ldarg_0);
ilg.Emit(OpCodes.Callvirt, Reader_Read);
ilg.Emit(OpCodes.Brfalse, exit);
//reader.GetValues(values);
ilg.Emit(OpCodes.Ldarg_0);
ilg.Emit(OpCodes.Ldloc_S, values);
ilg.Emit(OpCodes.Callvirt, Reader_GetValues);
ilg.Emit(OpCodes.Pop);
//item=new T();
ilg.Emit(OpCodes.Newobj, itemType.GetConstructor(Type.EmptyTypes));
ilg.Emit(OpCodes.Stloc_S, item);
//item.Property=Convert(values[index]);
for (int index = 0; index < properties.Length; index++)
{
PropertyInfo pi = properties[index];
if (pi == null)
{
continue;
}
//objValue=value[index];
ilg.Emit(OpCodes.Ldloc_S, values);
ilg.Emit(OpCodes.Ldc_I4, index);
ilg.Emit(OpCodes.Ldelem_Ref);
ilg.Emit(OpCodes.Stloc_S, objValue);
//tmpBool=Convert.IsDBNull(objValue);
ilg.Emit(OpCodes.Ldloc_S, objValue);
ilg.Emit(OpCodes.Call, Convert_IsDBNull);
//if (!tmpBool){
ilg.Emit(OpCodes.Brtrue_S, lblArray[index * 2]);
//item.Field=Convert(objValue).ToXXX();
ilg.Emit(OpCodes.Ldloc_S, item);
ilg.Emit(OpCodes.Ldloc_S, objValue);
convertValue(ilg, pi);
ilg.Emit(OpCodes.Callvirt, pi.GetSetMethod());
//}
ilg.Emit(OpCodes.Br_S, lblArray[index * 2 + 1]);
//else {
ilg.MarkLabel(lblArray[index * 2]);
//item.Field=objValue;
ilg.Emit(OpCodes.Ldloc_S, item);
ilg.Emit(OpCodes.Ldloc_S, typeNulls[index]);
ilg.Emit(OpCodes.Callvirt, pi.GetSetMethod());
//}
ilg.MarkLabel(lblArray[index * 2 + 1]);
}
//list.Add(item);
ilg.Emit(OpCodes.Ldloc_S, list);
ilg.Emit(OpCodes.Ldloc_S, item);
ilg.Emit(OpCodes.Callvirt, LAdd);
//}
ilg.Emit(OpCodes.Br, loop);
ilg.MarkLabel(exit);
// return list;
ilg.Emit(OpCodes.Ldloc_S, list);
ilg.Emit(OpCodes.Ret);
#if WRITE_FILE
Type t = tb.CreateType();
ab.Save(aName.Name + ".dll");
#else
//m_CatchMethod.Add(key, dm);//Not use the cache for the time being 2015-06-14
#endif
//if (m_CatchMethod.Count > 100)Not use the cache for the time being 2015-06-14
{
}
//}
//if (m_CatchMethod.ContainsKey(key))Not use the cache for the time being 2015-06-14
//{
//DynamicMethod dm = m_CatchMethod[key];//Not use the cache for the time being 2015-06-14
ReadEntityInvoker <List <T> > invoker = dm.CreateDelegate(typeof(ReadEntityInvoker <List <T> >)) as ReadEntityInvoker <List <T> >;
try// 2015-07-02
{
return(invoker.Invoke(reader));
}
catch (Exception)
{
reader.Close();
throw;
}
//}
throw new Exception("没有找到对应类型的处理方法。");
}
