1 | """ |
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2 | `PostgreSQL`_ database specific implementations of changeset classes. |
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3 | |
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4 | .. _`PostgreSQL`: http://www.postgresql.org/ |
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5 | """ |
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6 | from migrate.changeset import ansisql |
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7 | from sqlalchemy.databases import postgres as sa_base |
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8 | #import sqlalchemy as sa |
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9 | |
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10 | |
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11 | PGSchemaGenerator = sa_base.PGSchemaGenerator |
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12 | |
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13 | |
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14 | class PGSchemaGeneratorMixin(object): |
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15 | """Common code used by the PostgreSQL specific classes.""" |
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16 | |
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17 | def _do_quote_table_identifier(self, identifier): |
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18 | return identifier |
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19 | |
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20 | def _do_quote_column_identifier(self, identifier): |
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21 | return '"%s"'%identifier |
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22 | |
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23 | |
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24 | class PGColumnGenerator(PGSchemaGenerator, ansisql.ANSIColumnGenerator, |
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25 | PGSchemaGeneratorMixin): |
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26 | """PostgreSQL column generator implementation.""" |
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27 | pass |
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28 | |
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29 | |
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30 | class PGColumnDropper(ansisql.ANSIColumnDropper, PGSchemaGeneratorMixin): |
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31 | """PostgreSQL column dropper implementation.""" |
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32 | pass |
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33 | |
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34 | |
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35 | class PGSchemaChanger(ansisql.ANSISchemaChanger, PGSchemaGeneratorMixin): |
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36 | """PostgreSQL schema changer implementation.""" |
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37 | pass |
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38 | |
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39 | |
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40 | class PGConstraintGenerator(ansisql.ANSIConstraintGenerator, |
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41 | PGSchemaGeneratorMixin): |
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42 | """PostgreSQL constraint generator implementation.""" |
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43 | pass |
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44 | |
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45 | |
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46 | class PGConstraintDropper(ansisql.ANSIConstraintDropper, |
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47 | PGSchemaGeneratorMixin): |
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48 | """PostgreSQL constaint dropper implementation.""" |
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49 | pass |
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50 | |
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51 | |
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52 | class PGDialect(ansisql.ANSIDialect): |
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53 | columngenerator = PGColumnGenerator |
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54 | columndropper = PGColumnDropper |
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55 | schemachanger = PGSchemaChanger |
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56 | constraintgenerator = PGConstraintGenerator |
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57 | constraintdropper = PGConstraintDropper |
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