/// <summary>
/// 将 <see cref="IDataRecord"/> 映射为实体
/// </summary>
/// <typeparam reader="T">数据源</typeparam>
/// <param name="reader">数据源</param>
/// <param name="define">命令定义</param>
/// <returns></returns>
public static T ToModel <T>(this IDataRecord reader, CommandDefine define = null)
{
object obj = null;
object[] values = null;
int index = 0;
// 基元类初始化 ########################
if (Reflection.TypeUtils.IsPrimitive(typeof(T)))
{
//if(reader.IsDBNull(0)) return default(T)
//obj = reader.GetValue(0);
//return obj is DBNull ? default(T) : (T)obj;
return(reader.IsDBNull(0) ? default(T) : (T)reader.GetValue(0));
}
// 匿名类初始化 ########################
TypeRuntimeInfo runtime = TypeRuntimeInfoCache.GetRuntimeInfo <T>();
Inte.XFramework.Reflection.Emit.ConstructorInvoker ctor = runtime.ConstructInvoker;
if (runtime.IsAnonymousType)
{
values = new object[reader.FieldCount];
reader.GetValues(values);
for (index = 0; index < values.Length; ++index)
{
if (values[index] is DBNull)
{
values[index] = null;
}
}
return((T)ctor.Invoke(values));
}
// 实体类初始化 ########################
T model = (T)ctor.Invoke();
values = new object[reader.FieldCount];
reader.GetValues(values);
// 计算导航属性所占用的索引，这些索引对应的值不会赋给 T 实体
var sc = define as CommandDefine_Select;
if (sc == null || (sc.NavDescriptors != null && sc.NavDescriptors.Count == 0))
{
// 直接跑SQL,则不解析导航属性
for (int i = 0; i < reader.FieldCount; ++i)
{
obj = values[i];
if (obj == DBNull.Value)
{
continue;
}
string name = reader.GetName(i);
var wrapper = runtime.GetWrapper(name) as MemberAccessWrapper;
if (wrapper != null)
{
SetProperty(model, wrapper, obj);
}
}
}
else
{
// 使用表达式查询，解析导航属性
bool nav = sc.NavDescriptors.Any(x => x.Value.Count > 0);
int min = nav ? sc.NavDescriptors.Min(x => x.Value.Start) : 0;
// 第一层
index = -1;
foreach (var kvp in sc.Columns)
{
index += 1;
obj = values[index];
if (obj == DBNull.Value)
{
continue;
}
if (nav && index >= min)
{
break;
}
var wrapper = runtime.GetWrapper(kvp.Value.Name) as MemberAccessWrapper;
if (wrapper != null)
{
SetProperty(model, wrapper, obj);
}
}
// 递归导航属性
if (runtime.NavWrappers.Count > 0)
{
ToModel_Navigation(model, values, sc, string.Empty);
}
}
return(model);
}
/// <summary>
/// 将 <see cref="IDataRecord"/> 上的当前行反序列化为实体
/// </summary>
/// <returns></returns>
public T Deserialize()
{
#region 基元类型
if (Reflection.TypeUtils.IsPrimitive(typeof(T)))
{
if (_reader.IsDBNull(0))
{
return(default(T));
}
var obj = _reader.GetValue(0);
if (obj.GetType() != typeof(T))
{
obj = Convert.ChangeType(obj, typeof(T));
}
return((T)obj);
}
#endregion
#region 匿名类型
TypeRuntimeInfo runtime = TypeRuntimeInfoCache.GetRuntimeInfo <T>();
Inte.XFramework.Reflection.Emit.ConstructorInvoker ctor = runtime.ConstructInvoker;
if (runtime.IsAnonymousType)
{
object[] values = new object[_reader.FieldCount];
_reader.GetValues(values);
for (int index = 0; index < values.Length; ++index)
{
if (values[index] is DBNull)
{
values[index] = null;
}
}
return((T)ctor.Invoke(values));
}
#endregion
#region 实体类型
T model = default(T);
if (_define == null || (_define.NavDescriptors != null && _define.NavDescriptors.Count == 0))
{
// 直接跑SQL,则不解析导航属性
if (_topLevel == null)
{
_topLevel = GetDeserializer(typeof(T), _reader);
}
model = (T)_topLevel(_reader);
}
else
{
// 第一层
if (_topLevel == null)
{
_topLevel = GetDeserializer(typeof(T), _reader, _define.Columns, 0, _define.NavDescriptors.MinIndex);
}
model = (T)_topLevel(_reader);
// 递归导航属性
this.Deserialize_Navigation(model, string.Empty);
}
#endregion
return(model);
}