The Computational Materials Repository

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42 Introduction and usage of CMRTo remove files from the database the command delete can be used with astring list of UIs:cmr . d e l e t e ( [ s t r i n g l i s t o f UIs ] )The unique identifiers can be found in different ways depending on thelocation of the file. The only thing one has to know is that the unique id iscalled db hash in db-files:1. From a db-file with the command line interface:$ cmr −−dump O2 . dbcmr v e r s i o n 0 . 3 . 2 . 5 2 4∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗C a l c u l a t o r / I n s t a n c e : group /Hash : 2 fff9aa2b8faaaf190ab93356cdb4d2b0acba6c3
2.7 Groups 432.7 GroupsIt was already shown that the conversion of an ASE trajectory file results in agroup storing the contained steps and that the GroupingAgent makes groupsfor us. It is however often necessary to create groups manually. There aretwo options: The first one is to include all group members into a single db-file(Fig. 2.21) and the second one is to connect them with the UI (Fig. 2.22).For data exchange the first approach is suitable: Only a single file needs to besent, and it contains all data. The second approach is in general recommendedespecially if the data is already stored in the database.Figure 2.21: A group that contains its members in a single db-file.Figure 2.22: A group that references it’s members. The group identifies its membersby the UI which is always called db hash (denoted as A,B,C,D) in the db-files.Storing the complete members into db-files or referencing them is very similar.The first script stores them:import cmrmember1 = cmr . read ( ’ 1 . db ’ )member2 = cmr . read ( ’ 2 . db ’ )
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92 BIBLIOGRAPHY[35] XML Technology.
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The Computational Materials Repository

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