pgtools/pgbrowser.py
author Radek Brich <radek.brich@devl.cz>
Thu, 26 May 2011 18:09:05 +0200
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Postgres tools.
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# -*- coding: utf-8 -*-
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#
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# PgBrowser - browse database schema and metadata
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#
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# Some of the queries came from psql.
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#
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# Copyright (c) 2011  Radek Brich <radek.brich@devl.cz>
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#
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# Permission is hereby granted, free of charge, to any person obtaining a copy
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# of this software and associated documentation files (the "Software"), to deal
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# in the Software without restriction, including without limitation the rights
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# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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# copies of the Software, and to permit persons to whom the Software is
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# furnished to do so, subject to the following conditions:
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#
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# The above copyright notice and this permission notice shall be included in
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# all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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# THE SOFTWARE.
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from collections import OrderedDict
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class Column:
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    def __init__(self, browser, table,
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        name, type, notnull, hasdefault, default, description):
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        self.browser = browser  # Browser instance
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        self.table = table  # Table instance
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        self.name = name
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        self.type = type
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        self.notnull = notnull
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        self.hasdefault = hasdefault
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        self.default = default
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        self.description = description
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class Constraint:
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    def __init__(self, browser, table, name, type, definition):
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        self.browser = browser
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        self.table = table
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        self.name = name
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        self.type = type
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        self.definition = definition
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class Index:
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    def __init__(self, browser, table,
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        name, primary, unique, clustered, valid, definition):
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        self.browser = browser
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        self.table = table
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        self.name = name
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        self.primary = primary
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        self.unique = unique
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        self.clustered = clustered
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        self.valid = valid
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        self.definition = definition
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class Table:
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    def __init__(self, browser, schema, name, owner, size, description):
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        self._columns = None
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        self._constraints = None
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        self._indexes = None
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        self.browser = browser  # Browser instance
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        self.schema = schema  # Schema instance
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        self.name = name  # table name, str
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        self.owner = owner
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        self.size = size
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        self.description = description
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    def refresh(self):
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        self.refresh_columns()
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        self.refresh_constraints()
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        self.refresh_indexes()
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    def refresh_columns(self):
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        rows = self.browser.list_columns(self.name, self.schema.name)
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        self._columns = OrderedDict([(x['name'], Column(self.browser, self, **x)) for x in rows])
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    def refresh_constraints(self):
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        rows = self.browser.list_constraints(self.name, self.schema.name)
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        self._constraints = OrderedDict([(x['name'], Constraint(self.browser, self, **x)) for x in rows])
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    def refresh_indexes(self):
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        rows = self.browser.list_indexes(self.name, self.schema.name)
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        self._indexes = OrderedDict([(x['name'], Index(self.browser, self, **x)) for x in rows])
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    def getcolumns(self):
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        if self._columns is None:
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            self.refresh_columns()
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        return self._columns
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    columns = property(getcolumns)
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    def getconstraints(self):
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        if self._constraints is None:
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            self.refresh_constraints()
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        return self._constraints
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    constraints = property(getconstraints)
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    def getindexes(self):
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        if self._indexes is None:
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            self.refresh_indexes()
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        return self._indexes
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    indexes = property(getindexes)
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class Schema:
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    def __init__(self, browser, name, owner, acl, description, system):
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        self._tables = None
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        self.browser = browser
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        self.name = name
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        self.owner = owner
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        self.acl = acl
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        self.description = description
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        self.system = system
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    def refresh(self):
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        rows = self.browser.list_tables(self.name)
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        self._tables = OrderedDict([(x['name'], Table(self.browser, self, **x)) for x in rows]) 
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    def gettables(self):
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        if self._tables is None:
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            self.refresh()
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        return self._tables
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    tables = property(gettables)
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class PgBrowser:
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    def __init__(self, conn=None):
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        self._schemas = None
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        self.conn = conn
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    def setconn(self, conn=None):
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        self.conn = conn
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    def refresh(self):
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        rows = self.list_schemas()
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        self._schemas = OrderedDict([(x['name'], Schema(self, **x)) for x in rows])
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    def getschemas(self):
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        if self._schemas is None:
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            self.refresh()
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        return self._schemas
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    schemas = property(getschemas)
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   152
    def _query(self, query, *args):
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        try:
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            curs = self.conn.cursor()
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            curs.execute(query, args)
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            curs.connection.commit()
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            rows = curs.fetchall()
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   158
            return [dict(zip([desc[0] for desc in curs.description], row)) for row in rows]
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   159
        finally:
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   160
            curs.close()
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   161
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   162
    def list_databases(self):
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   163
        return self._query('''
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parents:
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   164
            SELECT
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   165
                d.datname as "name",
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   166
                pg_catalog.pg_get_userbyid(d.datdba) as "owner",
eaae9539e910 Postgres tools.
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parents:
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   167
                pg_catalog.pg_encoding_to_char(d.encoding) as "encoding",
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Radek Brich <radek.brich@devl.cz>
parents:
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   168
                d.datcollate as "collation",
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Radek Brich <radek.brich@devl.cz>
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   169
                d.datctype as "ctype",
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Radek Brich <radek.brich@devl.cz>
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   170
                d.datacl AS "acl",
eaae9539e910 Postgres tools.
Radek Brich <radek.brich@devl.cz>
parents:
diff changeset
   171
                CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')
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   172
                    THEN pg_catalog.pg_database_size(d.datname)
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Radek Brich <radek.brich@devl.cz>
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   173
                    ELSE -1 -- No access
eaae9539e910 Postgres tools.
Radek Brich <radek.brich@devl.cz>
parents:
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   174
                END as "size",
eaae9539e910 Postgres tools.
Radek Brich <radek.brich@devl.cz>
parents:
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   175
                t.spcname as "tablespace",
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parents:
diff changeset
   176
                pg_catalog.shobj_description(d.oid, 'pg_database') as "description"
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parents:
diff changeset
   177
            FROM pg_catalog.pg_database d
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   178
            JOIN pg_catalog.pg_tablespace t on d.dattablespace = t.oid
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   179
            ORDER BY 1;
eaae9539e910 Postgres tools.
Radek Brich <radek.brich@devl.cz>
parents:
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   180
            ''')
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Radek Brich <radek.brich@devl.cz>
parents:
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   181
eaae9539e910 Postgres tools.
Radek Brich <radek.brich@devl.cz>
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   182
    def list_schemas(self):
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parents:
diff changeset
   183
        return self._query('''
eaae9539e910 Postgres tools.
Radek Brich <radek.brich@devl.cz>
parents:
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   184
            SELECT
eaae9539e910 Postgres tools.
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parents:
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   185
                n.nspname AS "name",
eaae9539e910 Postgres tools.
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parents:
diff changeset
   186
                pg_catalog.pg_get_userbyid(n.nspowner) AS "owner",
eaae9539e910 Postgres tools.
Radek Brich <radek.brich@devl.cz>
parents:
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   187
                n.nspacl AS "acl",
eaae9539e910 Postgres tools.
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parents:
diff changeset
   188
                pg_catalog.obj_description(n.oid, 'pg_namespace') AS "description",
eaae9539e910 Postgres tools.
Radek Brich <radek.brich@devl.cz>
parents:
diff changeset
   189
                CASE WHEN n.nspname IN ('information_schema', 'pg_catalog', 'pg_toast')
eaae9539e910 Postgres tools.
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parents:
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   190
                    OR n.nspname ~ '^pg_temp_' OR n.nspname ~ '^pg_toast_temp_'
eaae9539e910 Postgres tools.
Radek Brich <radek.brich@devl.cz>
parents:
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   191
                    THEN TRUE
eaae9539e910 Postgres tools.
Radek Brich <radek.brich@devl.cz>
parents:
diff changeset
   192
                    ELSE FALSE
eaae9539e910 Postgres tools.
Radek Brich <radek.brich@devl.cz>
parents:
diff changeset
   193
                END AS "system"
eaae9539e910 Postgres tools.
Radek Brich <radek.brich@devl.cz>
parents:
diff changeset
   194
            FROM pg_catalog.pg_namespace n
eaae9539e910 Postgres tools.
Radek Brich <radek.brich@devl.cz>
parents:
diff changeset
   195
            ORDER BY 1;
eaae9539e910 Postgres tools.
Radek Brich <radek.brich@devl.cz>
parents:
diff changeset
   196
            ''')
eaae9539e910 Postgres tools.
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parents:
diff changeset
   197
eaae9539e910 Postgres tools.
Radek Brich <radek.brich@devl.cz>
parents:
diff changeset
   198
    def list_tables(self, schema='public'):
eaae9539e910 Postgres tools.
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parents:
diff changeset
   199
        return self._query('''
eaae9539e910 Postgres tools.
Radek Brich <radek.brich@devl.cz>
parents:
diff changeset
   200
            SELECT
eaae9539e910 Postgres tools.
Radek Brich <radek.brich@devl.cz>
parents:
diff changeset
   201
                c.relname as "name",
eaae9539e910 Postgres tools.
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parents:
diff changeset
   202
                pg_catalog.pg_get_userbyid(c.relowner) as "owner",
eaae9539e910 Postgres tools.
Radek Brich <radek.brich@devl.cz>
parents:
diff changeset
   203
                pg_catalog.pg_relation_size(c.oid) as "size",
eaae9539e910 Postgres tools.
Radek Brich <radek.brich@devl.cz>
parents:
diff changeset
   204
                pg_catalog.obj_description(c.oid, 'pg_class') as "description"
eaae9539e910 Postgres tools.
Radek Brich <radek.brich@devl.cz>
parents:
diff changeset
   205
            FROM pg_catalog.pg_class c
eaae9539e910 Postgres tools.
Radek Brich <radek.brich@devl.cz>
parents:
diff changeset
   206
            LEFT JOIN pg_catalog.pg_namespace n ON n.oid = c.relnamespace
eaae9539e910 Postgres tools.
Radek Brich <radek.brich@devl.cz>
parents:
diff changeset
   207
            WHERE n.nspname = %s AND c.relkind IN ('r','s','')
eaae9539e910 Postgres tools.
Radek Brich <radek.brich@devl.cz>
parents:
diff changeset
   208
            ORDER BY 1;
eaae9539e910 Postgres tools.
Radek Brich <radek.brich@devl.cz>
parents:
diff changeset
   209
            ''', schema)
eaae9539e910 Postgres tools.
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parents:
diff changeset
   210
eaae9539e910 Postgres tools.
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parents:
diff changeset
   211
    def list_columns(self, table, schema='public'):
eaae9539e910 Postgres tools.
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parents:
diff changeset
   212
        return self._query('''
eaae9539e910 Postgres tools.
Radek Brich <radek.brich@devl.cz>
parents:
diff changeset
   213
            SELECT
eaae9539e910 Postgres tools.
Radek Brich <radek.brich@devl.cz>
parents:
diff changeset
   214
                a.attname as "name",
eaae9539e910 Postgres tools.
Radek Brich <radek.brich@devl.cz>
parents:
diff changeset
   215
                format_type(a.atttypid, a.atttypmod) AS "type",
eaae9539e910 Postgres tools.
Radek Brich <radek.brich@devl.cz>
parents:
diff changeset
   216
                a.attnotnull as "notnull",
eaae9539e910 Postgres tools.
Radek Brich <radek.brich@devl.cz>
parents:
diff changeset
   217
                a.atthasdef as "hasdefault",
eaae9539e910 Postgres tools.
Radek Brich <radek.brich@devl.cz>
parents:
diff changeset
   218
                d.adsrc as "default",
eaae9539e910 Postgres tools.
Radek Brich <radek.brich@devl.cz>
parents:
diff changeset
   219
                pg_catalog.col_description(a.attrelid, a.attnum) AS "description"
eaae9539e910 Postgres tools.
Radek Brich <radek.brich@devl.cz>
parents:
diff changeset
   220
            FROM pg_catalog.pg_attribute a
eaae9539e910 Postgres tools.
Radek Brich <radek.brich@devl.cz>
parents:
diff changeset
   221
            LEFT JOIN pg_catalog.pg_class c ON a.attrelid = c.oid
eaae9539e910 Postgres tools.
Radek Brich <radek.brich@devl.cz>
parents:
diff changeset
   222
            LEFT JOIN pg_catalog.pg_namespace n ON n.oid = c.relnamespace
eaae9539e910 Postgres tools.
Radek Brich <radek.brich@devl.cz>
parents:
diff changeset
   223
            LEFT JOIN pg_catalog.pg_attrdef d ON a.attrelid = d.adrelid AND a.attnum = d.adnum
eaae9539e910 Postgres tools.
Radek Brich <radek.brich@devl.cz>
parents:
diff changeset
   224
            WHERE n.nspname = %s AND c.relname = %s AND a.attnum > 0 AND NOT a.attisdropped
eaae9539e910 Postgres tools.
Radek Brich <radek.brich@devl.cz>
parents:
diff changeset
   225
            ORDER BY 1
eaae9539e910 Postgres tools.
Radek Brich <radek.brich@devl.cz>
parents:
diff changeset
   226
            ''', schema, table)
eaae9539e910 Postgres tools.
Radek Brich <radek.brich@devl.cz>
parents:
diff changeset
   227
eaae9539e910 Postgres tools.
Radek Brich <radek.brich@devl.cz>
parents:
diff changeset
   228
    def list_constraints(self, table, schema='public'):
eaae9539e910 Postgres tools.
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parents:
diff changeset
   229
        return self._query('''
eaae9539e910 Postgres tools.
Radek Brich <radek.brich@devl.cz>
parents:
diff changeset
   230
            SELECT
eaae9539e910 Postgres tools.
Radek Brich <radek.brich@devl.cz>
parents:
diff changeset
   231
                conname as "name",
eaae9539e910 Postgres tools.
Radek Brich <radek.brich@devl.cz>
parents:
diff changeset
   232
                r.contype as "type",
eaae9539e910 Postgres tools.
Radek Brich <radek.brich@devl.cz>
parents:
diff changeset
   233
                pg_catalog.pg_get_constraintdef(r.oid, true) as "definition"
eaae9539e910 Postgres tools.
Radek Brich <radek.brich@devl.cz>
parents:
diff changeset
   234
            FROM pg_catalog.pg_constraint r
eaae9539e910 Postgres tools.
Radek Brich <radek.brich@devl.cz>
parents:
diff changeset
   235
            JOIN pg_catalog.pg_class c ON r.conrelid = c.oid
eaae9539e910 Postgres tools.
Radek Brich <radek.brich@devl.cz>
parents:
diff changeset
   236
            JOIN pg_catalog.pg_namespace n ON n.oid = c.relnamespace
eaae9539e910 Postgres tools.
Radek Brich <radek.brich@devl.cz>
parents:
diff changeset
   237
            WHERE n.nspname = %s AND c.relname = %s
eaae9539e910 Postgres tools.
Radek Brich <radek.brich@devl.cz>
parents:
diff changeset
   238
            ORDER BY 1
eaae9539e910 Postgres tools.
Radek Brich <radek.brich@devl.cz>
parents:
diff changeset
   239
            ''', schema, table)
eaae9539e910 Postgres tools.
Radek Brich <radek.brich@devl.cz>
parents:
diff changeset
   240
eaae9539e910 Postgres tools.
Radek Brich <radek.brich@devl.cz>
parents:
diff changeset
   241
    def list_indexes(self, table, schema='public'):
eaae9539e910 Postgres tools.
Radek Brich <radek.brich@devl.cz>
parents:
diff changeset
   242
        return self._query('''
eaae9539e910 Postgres tools.
Radek Brich <radek.brich@devl.cz>
parents:
diff changeset
   243
            SELECT
eaae9539e910 Postgres tools.
Radek Brich <radek.brich@devl.cz>
parents:
diff changeset
   244
                c2.relname as "name",
eaae9539e910 Postgres tools.
Radek Brich <radek.brich@devl.cz>
parents:
diff changeset
   245
                i.indisprimary as "primary",
eaae9539e910 Postgres tools.
Radek Brich <radek.brich@devl.cz>
parents:
diff changeset
   246
                i.indisunique as "unique",
eaae9539e910 Postgres tools.
Radek Brich <radek.brich@devl.cz>
parents:
diff changeset
   247
                i.indisclustered as "clustered",
eaae9539e910 Postgres tools.
Radek Brich <radek.brich@devl.cz>
parents:
diff changeset
   248
                i.indisvalid as "valid",
eaae9539e910 Postgres tools.
Radek Brich <radek.brich@devl.cz>
parents:
diff changeset
   249
                pg_catalog.pg_get_indexdef(i.indexrelid, 0, true) as "definition"
eaae9539e910 Postgres tools.
Radek Brich <radek.brich@devl.cz>
parents:
diff changeset
   250
                --c2.reltablespace as "tablespace_oid"
eaae9539e910 Postgres tools.
Radek Brich <radek.brich@devl.cz>
parents:
diff changeset
   251
            FROM pg_catalog.pg_class c
eaae9539e910 Postgres tools.
Radek Brich <radek.brich@devl.cz>
parents:
diff changeset
   252
            JOIN pg_catalog.pg_index i ON c.oid = i.indrelid
eaae9539e910 Postgres tools.
Radek Brich <radek.brich@devl.cz>
parents:
diff changeset
   253
            JOIN pg_catalog.pg_class c2 ON i.indexrelid = c2.oid
eaae9539e910 Postgres tools.
Radek Brich <radek.brich@devl.cz>
parents:
diff changeset
   254
            JOIN pg_catalog.pg_namespace n ON n.oid = c.relnamespace
eaae9539e910 Postgres tools.
Radek Brich <radek.brich@devl.cz>
parents:
diff changeset
   255
            WHERE n.nspname = %s AND c.relname = %s
eaae9539e910 Postgres tools.
Radek Brich <radek.brich@devl.cz>
parents:
diff changeset
   256
            ORDER BY i.indisprimary DESC, i.indisunique DESC, c2.relname
eaae9539e910 Postgres tools.
Radek Brich <radek.brich@devl.cz>
parents:
diff changeset
   257
            ''', schema, table)
eaae9539e910 Postgres tools.
Radek Brich <radek.brich@devl.cz>
parents:
diff changeset
   258