/// <summary>
/// 准备Where的子句，填写了VersionStartTime。在插入操作时，VST应该是MinValue。否则应该是最后一条记录的时间
/// </summary>
/// <param name="obj"></param>
/// <param name="mapping"></param>
/// <param name="builder"></param>
/// <returns></returns>
private IConnectiveSqlClause ModifyTimeFieldsInWhereBuilder(T obj, ORMappingItemCollection mapping, WhereSqlClauseBuilder builder)
{
string startTimeFieldName = GetPropertyFieldName("VersionStartTime", mapping);
string endTimeFieldName = GetPropertyFieldName("VersionEndTime", mapping);
if (builder.Exists(item => ((SqlClauseBuilderItemIUW)item).DataField == startTimeFieldName) == false)
{
builder.AppendItem(startTimeFieldName, obj.VersionStartTime);
}
builder.Remove(b => ((SqlClauseBuilderItemIUW)b).DataField == endTimeFieldName);
builder.AppendItem(endTimeFieldName, DBTimePointActionContext.MaxVersionEndTime);
return(builder);
}
private static WhereSqlClauseBuilder GetExistedKeysBuilder(IConnectiveSqlClause ownerKeyBuilder, T obj, ORMappingItemCollection mapping)
{
WhereSqlClauseBuilder keyBuilder = ORMapping.GetWhereSqlClauseBuilderByPrimaryKey(obj, mapping);
if (obj.VersionStartTime == DateTime.MinValue)
{
keyBuilder.IfExists(GetPropertyFieldName("VersionStartTime", mapping),
item =>
{
item.IsExpression = true;
item.Data = DBTimePointActionContext.CurrentTimeTSqlVarName;
});
}
foreach (string ownerKey in ownerKeyBuilder.GetFields())
{
keyBuilder.Remove(item => ((SqlClauseBuilderItemUW)item).DataField == ownerKey);
}
return(keyBuilder);
}