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dia_pg_import.py
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dia_pg_import.py
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# -*- coding: utf-8 -*-
# Plugin para o Dia, para importar tabelas do PostgreSQL para um diagrama
# Colocar em /usr/share/dia/python
import dia
import gtk
import psycopg2
import psycopg2.extensions
from abc import ABCMeta, abstractmethod
psycopg2.extensions.register_type(psycopg2.extensions.UNICODE)
psycopg2.extensions.register_type(psycopg2.extensions.UNICODEARRAY)
class Connection(object):
__connection = None
@staticmethod
def connect(host, port, user, passwd, db):
pg_params = ("host='{0}' port='{1}' user='{2}' password='{3}' "
"dbname='{4}'".format(host, port, user, passwd, db))
Connection.__connection = psycopg2.connect(pg_params)
@staticmethod
def query(query, qargs=None):
cursor = Connection.__connection.cursor()
cursor.execute(query, qargs)
data = cursor.fetchall()
cursor.close()
return data
class Schema(object):
def __init__(self, name):
self.name = name
self.__tables = None
self.__views = None
@classmethod
def with_name(cls, name):
data = Connection.query(
"SELECT nspname as name FROM pg_catalog.pg_namespace ns "
"WHERE nspname = %s",
(name,)
)
if data:
return Schema(name=data[0][0])
else:
return None
@property
def tables(self):
if self.__tables is None:
self.__tables = Table.all(schema=self)
return self.__tables
@property
def views(self):
if self.__views is None:
self.__views = View.all(schema=self)
return self.__views
def __unicode__(self):
return self.name
def __str__(self):
return unicode(self).encode('utf-8')
class Relation(object):
__metaclass__ = ABCMeta
def __init__(self, schema, name):
self.schema = schema
self.name = name
self.__columns = None
@property
def columns(self):
if self.__columns is None:
self.__columns = Column.all(self.schema, self)
return self.__columns
@classmethod
@abstractmethod
def all(cls, schema):
raise NotImplementedError
def __unicode__(self):
return self.name
def __str__(self):
return unicode(self).encode('utf-8')
@classmethod
def with_name(cls, schema, table_name):
data = Connection.query(
"SELECT table_name, table_type FROM information_schema.tables "
"WHERE table_schema = %s AND table_name = %s",
(schema.name, table_name,)
)
if not data:
return None
else:
r = data[0]
if r[1] == 'BASE TABLE':
return Table(schema=schema, name=r[0])
else:
return View(schema=schema, name=r[0])
class Table(Relation):
def __init__(self, schema, name):
super(Table, self).__init__(schema, name)
self.__constraints = None
self.__indexes = None
@classmethod
def all(cls, schema):
data = Connection.query(
"SELECT table_name, table_type FROM information_schema.tables "
"WHERE table_schema = %s AND table_type = 'BASE TABLE' "
"ORDER BY table_name",
(schema.name,)
)
return [Table(schema=schema, name=r[0]) for r in data]
@property
def constraints(self):
if self.__constraints is None:
self.__constraints = Constraint.all(self.schema, self)
return self.__constraints
def has_constraint(self, definition):
return definition in self.constraints
class Constraint(object):
def __init__(self, name, definition):
self.name = name
self.definition = definition
@classmethod
def all(cls, schema, table):
data = Connection.query(
""" SELECT conname,
pg_catalog.pg_get_constraintdef(r.oid, true) as condef
FROM pg_catalog.pg_constraint r
WHERE conrelid::regclass = (%s || '.' || %s)::regclass
""", (schema.name, table.name,))
return [Constraint(name=reg[0], definition=reg[1]) for reg in data]
class View(Relation):
@classmethod
def all(cls, schema):
data = Connection.query(
"SELECT table_name, table_type FROM information_schema.tables "
"WHERE table_schema = %s AND table_type = 'VIEW' "
"ORDER BY table_name",
(schema.name,)
)
return [View(schema=schema, name=r[0]) for r in data]
class Column(object):
def __init__(self, schema, table, name, data_type="", is_nullable=True,
character_maximum_length=None, numeric_precision=None):
self.schema = schema
self.table = table
self.name = name
self.__is_nullable = is_nullable
self.__data_type = data_type
self.__character_maximum_length = character_maximum_length
self.__numeric_precision = numeric_precision
@classmethod
def all(cls, schema, table):
data = Connection.query(
"SELECT column_name as name, is_nullable, data_type, "
"character_maximum_length, numeric_precision "
"FROM information_schema.columns "
"WHERE table_schema=%s and table_name=%s",
(schema.name, table.name,)
)
return [Column(schema=schema, table=table, name=r[0], is_nullable=r[1],
data_type=r[2], character_maximum_length=r[3],
numeric_precision=r[4])
for r in data]
@property
def data_type(self):
if (self.__data_type == "character varying"
and self.__character_maximum_length):
return u"%s(%d)" % (self.__data_type,
self.__character_maximum_length)
elif (self.__data_type == "integer"
or self.__data_type == "double precision"):
return u"%s(%d)" % (self.__data_type, self.__numeric_precision)
else:
return self.__data_type
@property
def is_nullable(self):
return isinstance(self.table, Table) and self.__is_nullable == "YES"
@property
def is_pk(self):
return (isinstance(self.table, Table)
and self.table.has_constraint(
'PRIMARY KEY ({0})'.format(self.name)
)
)
@property
def is_unique(self):
return (isinstance(self.table, Table)
and self.table.has_constraint('UNIQUE ({0})'.format(self.name))
)
def __unicode__(self):
return self.name
def __str__(self):
return unicode(self).encode('utf-8')
def attribute(name, ftype, pk=False, nullable=True, unique=False):
return (name, ftype, '', int(pk), int(nullable), int(unique))
class PgImportDialog(object):
def __init__(self, layer):
self.dia_layer = layer
self.window = gtk.Window()
self.window.set_title("Import PostgreSQL Tables")
vbox = gtk.VBox(True, 0)
self.host_entry = self._create_entry("Host: ", vbox, "localhost")
self.port_entry = self._create_entry("Port: ", vbox, "5432")
self.user_entry = self._create_entry("Username: ", vbox, "postgres")
self.passwd_entry = self._create_entry("Password: ", vbox)
self.db_entry = self._create_entry("Database: ", vbox)
self.schema_entry = self._create_entry("Schema: ", vbox)
self.table_entry = self._create_entry("Table (blank for all): ", vbox)
self.passwd_entry.set_visibility(False)
self.prefix_opt = gtk.CheckButton("Use schema prefix on name", False)
vbox.pack_start(self.prefix_opt)
self.prefix_opt.show()
import_btn = gtk.Button("Import")
import_btn.connect("clicked", self._on_import_btn_click)
cancel_btn = gtk.Button("Cancel")
cancel_btn.connect("clicked", self._on_cancel)
btn_hbox = gtk.HBox(True, 0)
btn_hbox.pack_start(import_btn, True, True, 2)
btn_hbox.pack_start(cancel_btn, True, True, 2)
import_btn.show()
cancel_btn.show()
vbox.pack_start(btn_hbox, True, True, 2)
btn_hbox.show()
self.window.add(vbox)
vbox.show()
self.window.show()
def _create_entry(self, text, vbox, placeholder=""):
hbox = gtk.HBox(True, 0)
label = gtk.Label(text)
hbox.pack_start(label, expand=True, fill=True, padding=2)
label.show()
entry = gtk.Entry()
hbox.pack_start(entry, expand=True, fill=True, padding=2)
entry.set_text(placeholder)
entry.show()
vbox.pack_start(hbox, expand=True, fill=True, padding=2)
hbox.show()
return entry
def _add_table(self, table, x, y, schema_prefix=False):
dia_table, h1, h2 = (dia.get_object_type("Database - Table")
.create(x, y))
dia_table.properties['name'] = (schema_prefix and
"{0}.{1}".format(table.schema.name,
table.name)
or table.name)
dia_table.properties['bold_primary_keys'] = True
dia_table.properties['attributes'] = tuple(
[attribute(name=c.name, ftype=c.data_type, nullable=c.is_nullable,
pk=c.is_pk, unique=c.is_unique)
for c in table.columns]
)
self.dia_layer.add_object(dia_table)
return dia_table
def _add_view(self, view, x, y, schema_prefix=False):
dia_table, h1, h2 = (dia.get_object_type("Database - Table")
.create(x, y))
dia_table.properties['name'] = (schema_prefix and
"{0}.{1}".format(view.schema.name,
view.name)
or view.name)
dia_table.properties['attributes'] = tuple(
[attribute(name=c.name, ftype=c.data_type, nullable=False)
for c in view.columns]
)
dia_table.properties['comment'] = 'view'
dia_table.properties['visible_comment'] = True
self.dia_layer.add_object(dia_table)
return dia_table
def _on_import_btn_click(self, *args):
SPACING = 3
MAX_X = 100
try:
Connection.connect(host=self.host_entry.get_text(),
port=self.port_entry.get_text(),
user=self.user_entry.get_text(),
passwd=self.passwd_entry.get_text(),
db=self.db_entry.get_text())
schema = Schema.with_name(self.schema_entry.get_text())
table_name = self.table_entry.get_text().strip()
if table_name:
rel = Relation.with_name(schema, table_name)
if isinstance(rel, Table):
self._add_table(rel, 0, 0, self.prefix_opt.get_active())
elif isinstance(rel, View):
self._add_view(rel, 0, 0, self.prefix_opt.get_active())
else:
dia.message(2, "Table not found")
else:
x, y, max_y = 0, 0, 0
for table in schema.tables:
dia_table = self._add_table(table, x, y,
self.prefix_opt.get_active())
x = dia_table.bounding_box.right + SPACING
max_y = max(max_y, dia_table.bounding_box.bottom)
if x > MAX_X:
x = 0
y = max_y + SPACING
for view in schema.views:
dia_table = self._add_view(view, x, y,
self.prefix_opt.get_active())
x = dia_table.bounding_box.right + SPACING
max_y = max(max_y, dia_table.bounding_box.bottom)
if x > MAX_X:
x = 0
y = max_y + SPACING
except Exception as e:
import sys
import os
exc_type, exc_obj, exc_tb = sys.exc_info()
fname = os.path.split(exc_tb.tb_frame.f_code.co_filename)[1]
dia.message(2, "{0}, {1}, {2}, {3}".format(exc_type, e.message,
fname, exc_tb.tb_lineno)
)
else:
dia.update_all()
self._on_cancel()
def _on_cancel(self, *args):
self.window.destroy()
def main(data, flags):
try:
active_display = dia.active_display()
diagram = active_display.diagram
active_layer = diagram.data.active_layer
PgImportDialog(active_layer)
except ImportError:
dia.message(0, "Dialog creation failed. Missing pygtk?")
dia.register_action("PgImport", "Import PostgreSQL Tables",
"/DisplayMenu/Dialogs/DialogsExtensionStart",
main)