pgtoolkit/pgdatacopy.py
author Radek Brich <radek.brich@devl.cz>
Fri, 11 May 2012 14:16:36 +0200
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permissions -rw-r--r--
TableCopyTool: order tables with respect to references.
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# -*- coding: utf-8 -*-
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#
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# PgDataCopy - copy data between tables
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#
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# Copyright (c) 2012  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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import io
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class TargetNotEmptyError(Exception):
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    def __init__(self, msg, table):
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        Exception.__init__(self, msg)
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        self.table = table
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class PgDataCopy:
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    def __init__(self, conn1, conn2):
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        self.conn1 = conn1
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        self.conn2 = conn2
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        self.fulltable1 = None
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        self.fulltable2 = None
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    def set_source(self, table, schema='public'):
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        self.schema1 = schema
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        self.table1 = table
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        self.fulltable1 = '"' + schema + '"."'+ table + '"'
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    def set_destination(self, table, schema='public'):
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        self.schema2 = schema
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        self.table2 = table
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        self.fulltable2 = '"' + schema + '"."'+ table + '"'
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    def copy(self):
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        self.check()
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        buf = io.StringIO()
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        try:
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            self.read(buf)
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            data = buf.getvalue()
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        finally:
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            buf.close()
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        buf = io.StringIO(data)
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        try:
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            self.write(buf)
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        finally:
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            buf.close()
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        self.analyze()
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    def check(self):
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        '''Check that target table does not contain any data (otherwise cannot copy).'''
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        q = self._compose_check(self.fulltable2)
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        curs = self.conn2.cursor()
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        curs.execute(q)
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        curs.connection.commit()
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        if curs.rowcount > 0:
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            raise TargetNotEmptyError('Target table contains data.', self.fulltable2)
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        self.cols = [desc[0] for desc in curs.description]
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    def read(self, tmpfile):
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        '''Read contents from source table.'''
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        q = self._compose_read(self.fulltable1, self.cols)
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        curs = self.conn1.cursor()
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        curs.copy_expert(q, tmpfile)
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        curs.connection.commit()
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    def write(self, tmpfile):
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        '''Write source table contents to target table.'''
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        q = self._compose_write(self.fulltable2, self.cols)
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        curs = self.conn2.cursor()
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        curs.copy_expert(q, tmpfile)
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        curs.connection.commit()
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    def analyze(self):
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        '''Analyze target table.'''
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        q = self._compose_analyze(self.fulltable2)
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        curs = self.conn2.cursor()
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        curs.execute(q)
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        curs.connection.commit()
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    def _compose_check(self, table):
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        return 'SELECT * FROM %s LIMIT 1' % table
98c7809af415 Add PgDataCopy. Add TableCopyTool.Add SrcDstTablesTool class to toolbase, use in tablecopy, tablediff.
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   106
    def _compose_read(self, table, cols):
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        collist = ', '.join(['"%s"' % col for col in cols])
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        return 'COPY %s (%s) TO STDOUT' % (table, collist)
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    def _compose_write(self, table, cols):
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        collist = ', '.join(['"%s"' % col for col in cols])
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        return 'COPY %s (%s) FROM STDIN' % (table, collist)
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   114
    def _compose_analyze(self, table):
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        return 'ANALYZE %s' % table
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   116