/// <summary>
/// 将一个 <see cref="IDataReader"/> 转换为一个 <typeparamref name="T"/> 的对象。
/// </summary>
/// <param name="database">当前的 <see cref="IDatabase"/> 对象。</param>
/// <param name="reader">一个 <see cref="IDataReader"/> 对象。</param>
/// <returns>由当前 <see cref="IDataReader"/> 对象中的数据转换成的 <typeparamref name="T"/> 对象实例。</returns>
public virtual T Map(IDatabase database, IDataReader reader)
{
var value = RecordWrapper == null ? reader[0] :
RecordWrapper.GetValue(reader, 0);
var converter = ConvertManager.GetConverter(typeof(T));
return(converter != null ? (T)converter.ConvertFrom(value, reader.GetFieldType(0).GetDbType()) :
value.To <object, T>());
}
private PropertyValue GetSupportedValue(bool isNull, PropertyMapping mapper, IDataReader reader)
{
try
{
if (mapper.Property.Type == typeof(Guid))
{
return(isNull ? new Guid?() : new Guid(reader.GetValue(mapper.Index).ToString()));
}
var typeCode = Type.GetTypeCode(mapper.Property.Type.GetNonNullableType());
switch (typeCode)
{
case TypeCode.Boolean:
return(isNull ? new bool?() : RecordWrapper.GetBoolean(reader, mapper.Index));
case TypeCode.Char:
return(isNull ? new char?() : RecordWrapper.GetChar(reader, mapper.Index));
case TypeCode.Byte:
return(isNull ? new byte?() : RecordWrapper.GetByte(reader, mapper.Index));
case TypeCode.Int16:
return(isNull ? new short?() : RecordWrapper.GetInt16(reader, mapper.Index));
case TypeCode.Int32:
return(isNull ? new int?() : RecordWrapper.GetInt32(reader, mapper.Index));
case TypeCode.Int64:
return(isNull ? new long?() : RecordWrapper.GetInt64(reader, mapper.Index));
case TypeCode.Decimal:
return(isNull ? new decimal?() : RecordWrapper.GetDecimal(reader, mapper.Index));
case TypeCode.Double:
return(isNull ? new double?() : RecordWrapper.GetDouble(reader, mapper.Index));
case TypeCode.String:
return(isNull ? string.Empty : RecordWrapper.GetString(reader, mapper.Index));
case TypeCode.DateTime:
return(isNull ? new DateTime?() : RecordWrapper.GetDateTime(reader, mapper.Index));
case TypeCode.Single:
return(isNull ? new float?() : RecordWrapper.GetFloat(reader, mapper.Index));
default:
return(PropertyValue.NewValue(RecordWrapper.GetValue(reader, mapper.Index)));
}
}
catch (Exception ex)
{
throw new RowMapperCastException(mapper.Property.Name, mapper.Property.Type, ex);
}
}
/// <summary>
/// 将一个 <see cref="IDataReader"/> 转换为一个 <typeparamref name="T"/> 的对象。
/// </summary>
/// <param name="reader">一个 <see cref="IDataReader"/> 对象。</param>
/// <returns>由当前 <see cref="IDataReader"/> 对象中的数据转换成的 <typeparamref name="T"/> 对象实例。</returns>
public virtual T Map(IDataReader reader)
{
var index = reader.FieldCount != 1 ? 1 : 0;
var value = RecordWrapper == null ? reader[index] :
RecordWrapper.GetValue(reader, index);
var converter = ConvertManager.GetConverter(typeof(T));
if (converter != null)
{
return((T)converter.ConvertFrom(value, reader.GetFieldType(index).GetDbType()));
}
return(value.To <object, T>());
}