815f07d6c1
Also: Allow override of database name and user in tests (important for me as I would have to mess with my PSQL and MySQL database users otherwise) Use dict.items instead of six.iteritems as it sporadically caused RuntimeError: dictionary changed size during iteration in Python 2.6 tests. Fix typo DNS to DSN Adds Python 3.5 to tox.ini Added an .editorconfig Import babel.dates in sqlalchemy_utils.i18n as an exception would be raised when using the latest versions of babel.
144 lines
3.6 KiB
Python
144 lines
3.6 KiB
Python
import sqlalchemy as sa
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from sqlalchemy.dialects import postgresql
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from sqlalchemy.ext.compiler import compiles
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from sqlalchemy.sql.expression import (
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_literal_as_text,
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ClauseElement,
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ColumnElement,
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Executable,
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FunctionElement
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)
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from sqlalchemy.sql.functions import GenericFunction
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from .functions.orm import quote
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class explain(Executable, ClauseElement):
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"""
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Define EXPLAIN element.
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http://www.postgresql.org/docs/devel/static/sql-explain.html
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"""
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def __init__(
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self,
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stmt,
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analyze=False,
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verbose=False,
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costs=True,
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buffers=False,
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timing=True,
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format='text'
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):
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self.statement = _literal_as_text(stmt)
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self.analyze = analyze
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self.verbose = verbose
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self.costs = costs
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self.buffers = buffers
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self.timing = timing
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self.format = format
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class explain_analyze(explain):
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def __init__(self, stmt, **kwargs):
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super(explain_analyze, self).__init__(
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stmt,
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analyze=True,
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**kwargs
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)
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@compiles(explain, 'postgresql')
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def pg_explain(element, compiler, **kw):
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text = "EXPLAIN "
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options = []
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if element.analyze:
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options.append('ANALYZE true')
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if not element.timing:
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options.append('TIMING false')
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if element.buffers:
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options.append('BUFFERS true')
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if element.format != 'text':
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options.append('FORMAT %s' % element.format)
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if element.verbose:
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options.append('VERBOSE true')
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if not element.costs:
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options.append('COSTS false')
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if options:
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text += '(%s) ' % ', '.join(options)
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text += compiler.process(element.statement)
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return text
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class array_get(FunctionElement):
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name = 'array_get'
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@compiles(array_get)
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def compile_array_get(element, compiler, **kw):
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args = list(element.clauses)
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if len(args) != 2:
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raise Exception(
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"Function 'array_get' expects two arguments (%d given)." %
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len(args)
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)
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if not hasattr(args[1], 'value') or not isinstance(args[1].value, int):
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raise Exception(
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"Second argument should be an integer."
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)
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return '(%s)[%s]' % (
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compiler.process(args[0]),
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sa.text(str(args[1].value + 1))
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)
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class row_to_json(GenericFunction):
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name = 'row_to_json'
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type = postgresql.JSON
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@compiles(row_to_json, 'postgresql')
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def compile_row_to_json(element, compiler, **kw):
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return "%s(%s)" % (element.name, compiler.process(element.clauses))
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class json_array_length(GenericFunction):
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name = 'json_array_length'
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type = sa.Integer
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@compiles(json_array_length, 'postgresql')
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def compile_json_array_length(element, compiler, **kw):
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return "%s(%s)" % (element.name, compiler.process(element.clauses))
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class array_agg(GenericFunction):
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name = 'array_agg'
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type = postgresql.ARRAY
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def __init__(self, arg, default=None, **kw):
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self.type = postgresql.ARRAY(arg.type)
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self.default = default
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GenericFunction.__init__(self, arg, **kw)
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@compiles(array_agg, 'postgresql')
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def compile_array_agg(element, compiler, **kw):
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compiled = "%s(%s)" % (element.name, compiler.process(element.clauses))
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if element.default is None:
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return compiled
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return str(sa.func.coalesce(
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sa.text(compiled),
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sa.cast(postgresql.array(element.default), element.type)
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).compile(compiler))
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class Asterisk(ColumnElement):
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def __init__(self, selectable):
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self.selectable = selectable
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@compiles(Asterisk)
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def compile_asterisk(element, compiler, **kw):
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return '%s.*' % quote(compiler.dialect, element.selectable.name)
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