/// <summary>
/// 从给定的实体类型所代表的实体集中读取给定标识的实体记录。
/// </summary>
/// <param name="entityType"></param>
/// <param name="id"></param>
/// <returns></returns>
public static DicReader GetData(this EntityTypeState entityType, Guid id)
{
if (entityType == null)
{
throw new ArgumentNullException("entityType");
}
if (entityType == EntityTypeState.Empty || entityType.AcDomain == null)
{
throw new InvalidOperationException();
}
// TODO:不能假定实体集是持久在关系数据库中的，这里需要提取策略。根据该实体类型上的不同配置以不同的策略访问不同的数据库。
RdbDescriptor db;
if (!entityType.AcDomain.Rdbs.TryDb(entityType.DatabaseId, out db))
{
throw new AnycmdException("意外的实体类型数据库标识" + entityType.Code);
}
if (string.IsNullOrEmpty(entityType.TableName))
{
throw new AnycmdException(entityType.Name + "未配置对应的数据库表");
}
var sql = "select * from " + string.Format("[{0}]", entityType.TableName) + " as a where Id=@Id";
var paramId = db.CreateParameter();
paramId.ParameterName = "Id";
paramId.Value = id;
paramId.DbType = DbType.Guid;
using (var reader = db.ExecuteReader(sql, paramId))
{
if (reader.Read())
{
var dic = new DicReader(entityType.AcDomain);
for (int i = 0; i < reader.FieldCount; i++)
{
dic.Add(reader.GetName(i), reader.GetValue(i));
}
return(dic);
}
}
return(null);
}
/// <summary>
///
/// </summary>
/// <param name="entityType"></param>
/// <param name="propertyCode"></param>
/// <param name="property"></param>
/// <returns></returns>
public static bool TryGetProperty(this EntityTypeState entityType, string propertyCode, out PropertyState property)
{
return(entityType.AcDomain.EntityTypeSet.TryGetProperty(entityType, propertyCode, out property));
}