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SQLAlchemy View support
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| from sqlalchemy.ext.compiler import compiles | |
| from sqlalchemy.sql.expression import Executable, ClauseElement | |
| from sqlalchemy.schema import DDLElement, DropTable | |
| from sqlalchemy.sql import table | |
| from sqlalchemy.orm import Query | |
| from . import db | |
| class CreateView(DDLElement): | |
| def __init__(self, name, selectable): | |
| self.name = name | |
| self.selectable = selectable | |
| class DropView(DDLElement): | |
| def __init__(self, name): | |
| self.name = name | |
| @compiles(CreateView) | |
| def compile_create_view(element, compiler, **kw): | |
| return "CREATE VIEW %s AS %s" % (element.name, compiler.sql_compiler.process(element.selectable)) | |
| @compiles(DropView) | |
| def compile_drop_view(element, compiler, **kw): | |
| return "DROP VIEW IF EXISTS %s" % (element.name) | |
| def View(name, selectable): | |
| """ | |
| `View` support for SQLAlchemy | |
| See: http://www.sqlalchemy.org/trac/wiki/UsageRecipes/Views | |
| """ | |
| t = table(name) | |
| if isinstance(selectable, Query): | |
| selectable = selectable.subquery() | |
| for c in selectable.c: | |
| c._make_proxy(t) | |
| CreateView(name, selectable).execute_at('after-create', db.metadata) | |
| DropView(name).execute_at('before-drop', db.metadata) | |
| return t |
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