Mercurial > p > roundup > code
annotate scripts/schema_diagram.py @ 6610:db3f0ba75b4a
Change checkpoint_data and restore_connection_on_error to subtransaction
checkpoint_data and restore_connection_on_error used to commit() and
rollback() the db connection. This causes additional I/O and load.
Changed them to use 'SAVEPOINT name' and 'ROLLBACK TO name' to get a
faster method for handling errors within a tranaction.
One thing to note is that postgresql (unlike SQL std) doesn't
overwrite an older savepoint with he same name. It keeps all
savepoints but only rolls back to the newest one with a given name.
This could be a resource issue. I left a commented out release
statement in case somebody runs into an issue due to too many
savepoints. I expect it to slow down the import but....
| author | John Rouillard <rouilj@ieee.org> |
|---|---|
| date | Sat, 29 Jan 2022 11:29:36 -0500 |
| parents | 23b8e6067f7c |
| children | 9c3ec0a5c7fc |
| rev | line source |
|---|---|
| 1166 | 1 #! /usr/bin/python |
| 2 # | |
| 3 # Schema diagram generator contributed by Stefan Seefeld of the fresco | |
| 4 # project http://www.fresco.org/. | |
| 5 # | |
| 6 # It generates a 'dot file' that is then fed into the 'dot' | |
| 7 # tool (http://www.graphviz.org) to generate a graph: | |
| 8 # | |
| 9 # %> ./schema.py | |
| 10 # %> dot -Tps schema.dot -o schema.ps | |
| 11 # %> gv schema.ps | |
| 12 # | |
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13 from __future__ import print_function |
| 1166 | 14 import sys |
| 15 import roundup.instance | |
| 16 | |
| 17 # open the instance | |
| 18 instance = roundup.instance.open(sys.argv[1]) | |
| 19 db = instance.open() | |
| 20 | |
| 21 # diagram preamble | |
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22 print('digraph schema {') |
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Python 3 preparation: convert print to a function.
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parents:
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23 print('size="8,6"') |
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Joseph Myers <jsm@polyomino.org.uk>
parents:
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24 print('node [shape="record" bgcolor="#ffe4c4" style=filled]') |
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Python 3 preparation: convert print to a function.
Joseph Myers <jsm@polyomino.org.uk>
parents:
1166
diff
changeset
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25 print('edge [taillabel="1" headlabel="1" dir=back arrowtail=ediamond]') |
| 1166 | 26 |
| 27 # get all the classes | |
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28 types = list(db.classes.keys()) |
| 1166 | 29 |
| 30 # one record node per class | |
| 31 for i in range(len(types)): | |
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32 print('node%d [label=\"{%s|}"]'%(i, types[i])) |
| 1166 | 33 |
| 34 # now draw in the relations | |
| 35 for name in db.classes.keys(): | |
| 36 type = db.classes[name] | |
| 37 attributes = type.getprops() | |
| 38 for a in attributes.keys(): | |
| 39 attribute = attributes[a] | |
| 40 if isinstance(attribute, roundup.hyperdb.Link): | |
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Python 3 preparation: convert print to a function.
Joseph Myers <jsm@polyomino.org.uk>
parents:
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41 print('node%d -> node%d [label=%s]'%(types.index(name), |
| 1166 | 42 types.index(attribute.classname), |
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Joseph Myers <jsm@polyomino.org.uk>
parents:
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43 a)) |
| 1166 | 44 elif isinstance(attribute, roundup.hyperdb.Multilink): |
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Joseph Myers <jsm@polyomino.org.uk>
parents:
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45 print('node%d -> node%d [taillabel="*" label=%s]'%(types.index(name), |
| 1166 | 46 types.index(attribute.classname), |
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parents:
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47 a)) |
| 1166 | 48 # all done |
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parents:
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49 print('}') |