sqlalchemy.ext compiler Example Code

compiler is a callable within the sqlalchemy.ext module of the SQLAlchemy project.

Example 1 from sqlalchemy-utils

sqlalchemy-utils (project documentation and PyPI package information) is a code library with various helper functions and new data types that make it easier to use SQLAlchemy when building projects that involve more specific storage requirements such as currency. The wide array of data types includes ranged values and aggregated attributes.

sqlalchemy-utils / sqlalchemy_utils / view.py

# view.py
import sqlalchemy as sa
from sqlalchemy.ext import compiler
from sqlalchemy.schema import DDLElement, PrimaryKeyConstraint


class CreateView(DDLElement):
    def __init__(self, name, selectable, materialized=False):
        self.name = name
        self.selectable = selectable
        self.materialized = materialized


@compiler.compiles(CreateView)
def compile_create_materialized_view(element, compiler, **kw):
    return 'CREATE {}VIEW {} AS {}'.format(
        'MATERIALIZED ' if element.materialized else '',
        element.name,
        compiler.sql_compiler.process(element.selectable, literal_binds=True),
    )


class DropView(DDLElement):
    def __init__(self, name, materialized=False, cascade=True):
        self.name = name
        self.materialized = materialized
        self.cascade = cascade


@compiler.compiles(DropView)
def compile_drop_materialized_view(element, compiler, **kw):
    return 'DROP {}VIEW IF EXISTS {} {}'.format(
        'MATERIALIZED ' if element.materialized else '',
        element.name,
        'CASCADE' if element.cascade else ''
    )


def create_table_from_selectable(
    name,
    selectable,
    indexes=None,
    metadata=None,


## ... source file continues with no further compiler examples...

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