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"""defines ANSI SQL operations."""
import sqlalchemy.schema as schema
from sqlalchemy.schema import *
import sqlalchemy.sql as sql
import sqlalchemy.engine
from sqlalchemy.sql import *
from sqlalchemy.util import *
import string
def engine(**params):
return ANSISQLEngine(**params)
class ANSISQLEngine(sqlalchemy.engine.SQLEngine):
def tableimpl(self, table):
return ANSISQLTableImpl(table)
def schemagenerator(self, proxy, **params):
return ANSISchemaGenerator(proxy, **params)
def schemadropper(self, proxy, **params):
return ANSISchemaDropper(proxy, **params)
def connect_args(self):
return ([],{})
def dbapi(self):
return object()
def compile(self, statement, bindparams):
compiler = ANSICompiler(statement, bindparams)
statement.accept_visitor(compiler)
return compiler
class ANSICompiler(sql.Compiled):
def __init__(self, parent, bindparams):
self.binds = {}
self.bindparams = bindparams
self.parent = parent
self.froms = {}
self.wheres = {}
self.strings = {}
def get_from_text(self, obj):
return self.froms[obj]
def get_str(self, obj):
return self.strings[obj]
def get_whereclause(self, obj):
return self.wheres.get(obj, None)
def get_params(self, **params):
d = {}
for key, value in params.iteritems():
try:
b = self.binds[key]
except KeyError:
raise "No such bind param in statement '%s': %s" % (str(self), key)
d[b.key] = value
for b in self.binds.values():
if not d.has_key(b.key):
d[b.key] = b.value
return d
def visit_column(self, column):
if column.table.name is None:
self.strings[column] = column.name
else:
self.strings[column] = "%s.%s" % (column.table.name, column.name)
def visit_fromclause(self, fromclause):
self.froms[fromclause] = fromclause.from_name
def visit_textclause(self, textclause):
if textclause.parens and len(textclause.text):
self.strings[textclause] = "(" + textclause.text + ")"
else:
self.strings[textclause] = textclause.text
def visit_compound(self, compound):
if compound.operator is None:
sep = " "
else:
sep = " " + compound.operator + " "
if compound.parens:
self.strings[compound] = "(" + string.join([self.get_str(c) for c in compound.clauses], sep) + ")"
else:
self.strings[compound] = string.join([self.get_str(c) for c in compound.clauses], sep)
def visit_clauselist(self, list):
self.strings[list] = string.join([self.get_str(c) for c in list.clauses], ', ')
def visit_binary(self, binary):
if binary.parens:
self.strings[binary] = "(" + self.get_str(binary.left) + " " + str(binary.operator) + " " + self.get_str(binary.right) + ")"
else:
self.strings[binary] = self.get_str(binary.left) + " " + str(binary.operator) + " " + self.get_str(binary.right)
def visit_bindparam(self, bindparam):
self.binds[bindparam.shortname] = bindparam
count = 1
key = bindparam.key
while self.binds.setdefault(key, bindparam) is not bindparam:
key = "%s_%d" % (bindparam.key, count)
count += 1
self.strings[bindparam] = ":" + key
def visit_alias(self, alias):
self.froms[alias] = self.get_from_text(alias.selectable) + " " + alias.name
def visit_select(self, select):
inner_columns = []
for c in select._raw_columns:
for co in c.columns:
inner_columns.append(co)
if select.use_labels:
collist = string.join(["%s AS %s" % (c.fullname, c.label) for c in inner_columns], ', ')
else:
collist = string.join([c.fullname for c in inner_columns], ', ')
text = "SELECT " + collist + " FROM "
whereclause = select.whereclause
froms = []
for f in select.froms.values():
# special thingy used by oracle to redefine a join
w = self.get_whereclause(f)
if w is not None:
# TODO: move this more into the oracle module
whereclause = sql.and_(w, whereclause)
self.visit_compound(whereclause)
t = self.get_from_text(f)
if t is not None:
froms.append(t)
text += string.join(froms, ', ')
if whereclause is not None:
t = self.get_str(whereclause)
if t:
text += " WHERE " + t
for tup in select._clauses:
text += " " + tup[0] + " " + self.get_str(tup[1])
self.strings[select] = text
self.froms[select] = "(" + text + ")"
def visit_table(self, table):
self.froms[table] = table.name
def visit_join(self, join):
if join.isouter:
self.froms[join] = ("(" + self.get_from_text(join.left) + " LEFT OUTER JOIN " + self.get_from_text(join.right) +
" ON " + self.get_str(join.onclause) + ")")
else:
self.froms[join] = ("(" + self.get_from_text(join.left) + " JOIN " + self.get_from_text(join.right) +
" ON " + self.get_str(join.onclause) + ")")
def visit_insert(self, insert_stmt):
colparams = insert_stmt.get_colparams(self.bindparams)
for c in colparams:
b = c[1]
self.binds[b.key] = b
self.binds[b.shortname] = b
text = ("INSERT INTO " + insert_stmt.table.name + " (" + string.join([c[0].name for c in colparams], ', ') + ")" +
" VALUES (" + string.join([":" + c[1].key for c in colparams], ', ') + ")")
self.strings[insert_stmt] = text
def visit_update(self, update_stmt):
colparams = update_stmt.get_colparams(self.bindparams)
for c in colparams:
b = c[1]
self.binds[b.key] = b
self.binds[b.shortname] = b
text = "UPDATE " + update_stmt.table.name + " SET " + string.join(["%s=:%s" % (c[0].name, c[1].key) for c in colparams], ', ')
if update_stmt.whereclause:
text += " WHERE " + self.get_str(update_stmt.whereclause)
self.strings[update_stmt] = text
def __str__(self):
return self.get_str(self.parent)
class ANSISQLTableImpl(sql.TableImpl):
"""Selectable implementation that gets attached to a schema.Table object."""
def __init__(self, table):
sql.TableImpl.__init__(self)
self.table = table
self.id = self.table.name
def get_from_text(self):
return self.table.name
class ANSISchemaGenerator(sqlalchemy.engine.SchemaIterator):
def visit_table(self, table):
self.append("\nCREATE TABLE " + table.name + "(")
separator = "\n"
for column in table.columns:
self.append(separator)
separator = ", \n"
self.append("\t" + column._get_specification())
self.append("\n)\n\n")
self.execute()
def visit_column(self, column):
pass
class ANSISchemaDropper(sqlalchemy.engine.SchemaIterator):
def visit_table(self, table):
self.append("\nDROP TABLE " + table.name)
self.execute()
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