/// <summary>
///
/// </summary>
/// <param name="type"></param>
/// <param name="dataRecord"></param>
/// <returns></returns>
public static IDataReaderEntityBuilder <T> CreateBuilder(Type type, IDataRecord dataRecord)
{
IDataReaderEntityBuilder <T> dynamicBuilder = new IDataReaderEntityBuilder <T>();
DynamicMethod method = new DynamicMethod("DynamicCreateEntity", type,
new Type[] { typeof(IDataRecord) }, type, true);
ILGenerator generator = method.GetILGenerator();
LocalBuilder result = generator.DeclareLocal(type);
generator.Emit(OpCodes.Newobj, type.GetConstructor(Type.EmptyTypes));
generator.Emit(OpCodes.Stloc, result);
string cacheKey = "SqlSugarClient.InitAttributes";
var cm = CacheManager <List <KeyValue> > .GetInstance();
var tFieldNames = typeof(T).GetProperties().Select(it => it.Name).ToList();
for (int i = 0; i < dataRecord.FieldCount; i++)
{
string dbFieldName = dataRecord.GetName(i);
if (cm.ContainsKey(cacheKey) && cm[cacheKey].Any(it => it.Value == dbFieldName))
{
var classFieldName = cm[cacheKey].Single(it => it.Value == dbFieldName).Key;
if (tFieldNames.Any(it => it == classFieldName)) //T包含映射属性
{
dbFieldName = classFieldName;
}
}
//实体类的字段名与数据库大小写不一致可以映射
if (!tFieldNames.Any(it => it == dbFieldName) && tFieldNames.Any(it => it.ToLower() == dbFieldName.ToLower()))
{
dbFieldName = tFieldNames.Single(it => it.ToLower() == dbFieldName.ToLower());
}
PropertyInfo propertyInfo = type.GetProperty(dbFieldName);
Label endIfLabel = generator.DefineLabel();
if (propertyInfo != null && propertyInfo.GetSetMethod() != null)
{
bool isNullable = false;
var underType = SqlSugarTool.GetUnderType(propertyInfo, ref isNullable);
generator.Emit(OpCodes.Ldarg_0);
generator.Emit(OpCodes.Ldc_I4, i);
generator.Emit(OpCodes.Callvirt, isDBNullMethod);
generator.Emit(OpCodes.Brtrue, endIfLabel);
generator.Emit(OpCodes.Ldloc, result);
generator.Emit(OpCodes.Ldarg_0);
generator.Emit(OpCodes.Ldc_I4, i);
GeneratorCallMethod(generator, underType, isNullable, propertyInfo, dataRecord.GetDataTypeName(i), dbFieldName);
generator.Emit(OpCodes.Callvirt, propertyInfo.GetSetMethod());
generator.MarkLabel(endIfLabel);
}
}
generator.Emit(OpCodes.Ldloc, result);
generator.Emit(OpCodes.Ret);
dynamicBuilder.handler = (Load)method.CreateDelegate(typeof(Load));
return(dynamicBuilder);
}