* Add db version utils.

sdt/bin/sddbversionutils.py

@@ -0,0 +1,58 @@
+#!/usr/bin/env python
+# -*- coding: ISO-8859-1 -*-
+
+##################################
+#  @program        synda
+#  @description    climate models data transfer program
+#  @copyright      Copyright “(c)2009 Centre National de la Recherche Scientifique CNRS. 
+#                             All Rights Reserved”
+#  @license        CeCILL (https://raw.githubusercontent.com/Prodiguer/synda/master/sdt/doc/LICENSE)
+##################################
+
+"""This module contains database versioning utils routines.
+
+Note
+    Version pattern must be "x.x" with x an integer.
+"""
+
+def _str2int(version):
+    assert isinstance(version,str)
+    return int(float(version)*10)
+
+def _int2str(version):
+    assert isinstance(version,int)
+    return str(float(version)/10)
+
+def version_range(version_begin,version_end):
+    """Return version range between version_begin and version_end."""
+
+    vb=_str2int(version_begin)
+    ve=_str2int(version_end)
+
+    return [_int2str(i) for i in range(vb,ve)]
+
+# --- version table I/O --- #
+
+def get_db_version(conn):
+    """
+    Note
+        Return None if 'version' table is empty
+    """
+    c = conn.cursor()
+    c.execute("select version from version")
+    rs=c.fetchone()
+    version=rs[0] if rs!=None else None
+    c.close()
+
+    return version
+
+def update_db_version(conn,version):
+    c = conn.cursor()
+    c.execute("update version set version=?",(version,))
+    conn.commit()
+    c.close()
+
+# init.
+
+if __name__ == '__main__':
+    print version_range('3.0','4.2')