/// <summary>
/// 判断本实例更变的值与被比实体对应值是否相等
/// </summary>
/// <param name="objEntity">被比较实体</param>
/// <returns>是否相等</returns>
public bool EqualsModify(EntityObjectBase objEntity)
{
if (objEntity.GetType() != this.GetType())
{
return(false);
}
TableAttributes taEntity = objEntity.GetEntityColumns();
TableAttributes taThis = this.GetEntityColumns();
bool bEquals = true;
for (int i = 0; i < taEntity.Columns.Count; i++)
{
ColumnAttributes caEntity = taEntity.Columns[i] as ColumnAttributes;
ColumnAttributes caThis = taThis.Columns[i] as ColumnAttributes;
if (caThis.IsModify && (caEntity.Value.ToString() != caThis.Value.ToString()))
{
bEquals = false;
break;
}
}
return(bEquals);
}
/// <summary>
/// 取实体映射的数据库表信息
/// </summary>
/// <param name="objEntity">实体对像</param>
/// <returns>映射表信息</returns>
public static TableAttributes GetEntityColumns(EntityObjectBase objEntity)
{
TableAttributes taEntity = new TableAttributes();
#region 取表名称
object[] objTable = objEntity.GetType().GetCustomAttributes(typeof(TableMapping), false);
if (objTable.Length > 0)
{
if (objTable[0] is TableMapping)
{
TableMapping tmCurrent = objTable[0] as TableMapping;
taEntity.TableName = tmCurrent.TableName;
}
}
#endregion
#region 取字段名称
foreach (PropertyInfo pi in objEntity.GetType().GetProperties())
{ // 根据属性映射创建表模式并记录属性值
object[] objColumn = pi.GetCustomAttributes(typeof(ColumnMapping), false);
if (objColumn.Length > 0)
{
if (objColumn[0] is ColumnMapping)
{
if (pi.CanRead)
{
ColumnMapping attrCurrent = objColumn[0] as ColumnMapping;
ColumnAttributes caCurrent = new ColumnAttributes();
caCurrent.ColumnName = attrCurrent.ColumnName;
caCurrent.IsIdentity = attrCurrent.IsIdentity;
caCurrent.IsPrimaryKey = attrCurrent.IsPrimaryKey;
caCurrent.IsVersionNumber = attrCurrent.IsVersionNumber;
caCurrent.Value = pi.GetValue(objEntity, null);
caCurrent.OriginalValue = objEntity.table.Rows[0][attrCurrent.ColumnName];
if (caCurrent.OriginalValue.ToString() != caCurrent.Value.ToString())
{
caCurrent.IsModify = true;
}
taEntity.Columns.Add(caCurrent);
}
}
}
}
#endregion
return(taEntity);
}