/// <summary>
/// 获取Reader映射缓存方法
/// </summary>
/// <typeparam name="T">返回的类型</typeparam>
/// <param name="reader">数据库返回的DataReader</param>
/// <param name="sql">SQL语句</param>
/// <returns>动态缓存方法</returns>
private static SqlDelegate <T> .GetReaderInstance GetEmitReaderCache <T>(IDataReader reader, int startIndex, int length)
{
Type returnType = typeof(T);
if (!Cache.SqlCache.ContainsKey(returnType))
{
ModelAnalyser.Initialization(returnType);
}
SqlModel sqlModel = Cache.SqlCache[returnType];
Delegate dynamicMethod = EHandler.CreateMethod <IDataReader, T>((il) =>
{
EMethod dataHandler = typeof(IDataRecord);
EVar parameterVar = EVar.CreateVarFromParameter <IDataRecord>(0);
if (returnType == typeof(object) || returnType == typeof(string) || returnType == typeof(byte[]) || (returnType.IsValueType && returnType.IsPrimitive) || il.IsNullable(returnType))
{
if (returnType.IsValueType && returnType.IsPrimitive)
{
LoadStrongTypeValue(returnType, parameterVar, startIndex);
}
else
{
EJudge.If(() => { EMethod.Load(parameterVar).ExecuteMethod <int>("IsDBNull", startIndex); })(() =>
{
if (il.IsNullable(returnType))
{
EModel model = EModel.CreateModel(returnType).UseDefaultConstructor();
model.Load();
}
else
{
ENull.LoadNull();
}
}).Else(() =>
{
LoadStrongTypeValue(returnType, parameterVar, startIndex);
});
}
}
else
{
EModel model = EModel.CreateModel <T>().UseDefaultConstructor();
for (int i = startIndex; i < startIndex + length; i += 1)
{
string tempName = sqlModel.GetRealName(reader.GetName(i));
Type type = null;
if (!model.Struction.Properties.ContainsKey(tempName) && !model.Struction.Fields.ContainsKey(tempName))
{
continue;
}
else
{
type = sqlModel.Struction.ModelTypeCache[tempName];
}
if (type.IsValueType && type.IsPrimitive)
{
model.Set(tempName, () =>
{
LoadStrongTypeValue(type, parameterVar, i);
});
}
else
{
EJudge.IfTrue(() => { EMethod.Load(parameterVar).ExecuteMethod <int>("IsDBNull", i); })(() =>
{
model.Set(tempName, () =>
{
LoadStrongTypeValue(type, parameterVar, i);
});
});
}
}
model.Load();
}
}).Compile(typeof(SqlDelegate <T> .GetReaderInstance));
return((SqlDelegate <T> .GetReaderInstance)dynamicMethod);
}
