Merge from trunk

[plcapi.git] / trunk / psycopg2 / examples / copy_to.py

diff --git a/trunk/psycopg2/examples/copy_to.py b/trunk/psycopg2/examples/copy_to.py
new file mode 100644 (file)
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+++ b/trunk/psycopg2/examples/copy_to.py
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+# copy_to.py -- example about copy_to 
+#
+# Copyright (C) 2002 Tom Jenkins <tjenkins@devis.com>
+# Copyright (C) 2005 Federico Di Gregorio <fog@initd.org>
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by the
+# Free Software Foundation; either version 2, or (at your option) any later
+# version.
+#
+# This program is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTIBILITY
+# or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+# for more details.
+#
+
+## put in DSN your DSN string
+
+DSN = 'dbname=test'
+
+## don't modify anything below tis line (except for experimenting)
+
+import sys
+import os
+import StringIO
+import psycopg2
+
+if len(sys.argv) > 1:
+    DSN = sys.argv[1]
+
+print "Opening connection using dns:", DSN
+conn = psycopg2.connect(DSN)
+print "Encoding for this connection is", conn.encoding
+
+curs = conn.cursor()
+try:
+    curs.execute("CREATE TABLE test_copy (fld1 text, fld2 text, fld3 int4)")
+except:
+    conn.rollback()
+    curs.execute("DROP TABLE test_copy")
+    curs.execute("CREATE TABLE test_copy (fld1 text, fld2 text, fld3 int4)")
+conn.commit()
+
+# demostrate copy_to functionality
+data = [('Tom', 'Jenkins', '37'),
+        ('Madonna', None, '45'),
+        ('Federico', 'Di Gregorio', None)]
+query = "INSERT INTO test_copy VALUES (%s, %s, %s)"
+curs.executemany(query, data)
+conn.commit()
+
+# copy_to using defaults
+io = open('copy_to.txt', 'w')
+curs.copy_to(io, 'test_copy')
+print "1) Copy %d records into file object using defaults: " % len (data) + \
+      "sep = \\t and null = \\N"
+io.close()
+
+rows = open('copy_to.txt', 'r').readlines()
+print "   File has %d rows:" % len(rows)
+
+for r in rows:
+    print "   ", r,
+
+# copy_to using custom separator
+io = open('copy_to.txt', 'w')
+curs.copy_to(io, 'test_copy', ':')
+print "2) Copy %d records into file object using sep = :" % len(data)
+io.close()
+
+rows = open('copy_to.txt', 'r').readlines()
+print "   File has %d rows:" % len(rows)
+
+for r in rows:
+    print "   ", r,
+
+# copy_to using custom null identifier
+io = open('copy_to.txt', 'w')
+curs.copy_to(io, 'test_copy', null='NULL')
+print "3) Copy %d records into file object using null = NULL" % len(data)
+io.close()
+
+rows = open('copy_to.txt', 'r').readlines()
+print "   File has %d rows:" % len(rows)
+
+for r in rows:
+    print "   ", r,
+
+# copy_to using custom separator and null identifier
+io = open('copy_to.txt', 'w')
+curs.copy_to(io, 'test_copy', ':', 'NULL')
+print "4) Copy %d records into file object using sep = : and null ) NULL" % \
+      len(data)
+io.close()
+
+rows = open('copy_to.txt', 'r').readlines()
+print "   File has %d rows:" % len(rows)
+
+for r in rows:
+    print "   ", r,
+
+curs.execute("DROP TABLE test_copy")
+os.unlink('copy_to.txt')
+conn.commit()