[Python-checkins] r62012 - in python/trunk/Lib/sqlite3: dump.py test/dump.py

[gregory.p.smith]

Author: gregory.p.smith
Date: Fri Mar 28 21:11:49 2008
New Revision: 62012

Added:
   python/trunk/Lib/sqlite3/dump.py
   python/trunk/Lib/sqlite3/test/dump.py
Log:
These svn adds were forgotten in r62000


Added: python/trunk/Lib/sqlite3/dump.py
==============================================================================
--- (empty file)
+++ python/trunk/Lib/sqlite3/dump.py	Fri Mar 28 21:11:49 2008
@@ -0,0 +1,63 @@
+# Mimic the sqlite3 console shell's .dump command
+# Author: Paul Kippes <kippesp at gmail.com>
+
+def _iterdump(connection):
+    """
+    Returns an iterator to the dump of the database in an SQL text format.
+
+    Used to produce an SQL dump of the database.  Useful to save an in-memory
+    database for later restoration.  This function should not be called
+    directly but instead called from the Connection method, iterdump().
+    """
+
+    cu = connection.cursor()
+    yield('BEGIN TRANSACTION;')
+
+    # sqlite_master table contains the SQL CREATE statements for the database.
+    q = """
+        SELECT name, type, sql
+        FROM sqlite_master
+            WHERE sql NOT NULL AND
+            type == 'table'
+        """
+    schema_res = cu.execute(q)
+    for table_name, type, sql in schema_res.fetchall():
+        if table_name == 'sqlite_sequence':
+            yield('DELETE FROM sqlite_sequence;')
+        elif table_name == 'sqlite_stat1':
+            yield('ANALYZE sqlite_master;')
+        elif table_name.startswith('sqlite_'):
+            continue
+        # NOTE: Virtual table support not implemented
+        #elif sql.startswith('CREATE VIRTUAL TABLE'):
+        #    qtable = table_name.replace("'", "''")
+        #    yield("INSERT INTO sqlite_master(type,name,tbl_name,rootpage,sql)"\
+        #        "VALUES('table','%s','%s',0,'%s');" %
+        #        qtable,
+        #        qtable,
+        #        sql.replace("''"))
+        else:
+            yield('%s;' % sql)
+
+        # Build the insert statement for each row of the current table
+        res = cu.execute("PRAGMA table_info('%s')" % table_name)
+        column_names = [str(table_info[1]) for table_info in res.fetchall()]
+        q = "SELECT 'INSERT INTO \"%(tbl_name)s\" VALUES("
+        q += ",".join(["'||quote(" + col + ")||'" for col in column_names])
+        q += ")' FROM '%(tbl_name)s'"
+        query_res = cu.execute(q % {'tbl_name': table_name})
+        for row in query_res:
+            yield("%s;" % row[0])
+
+    # Now when the type is 'index', 'trigger', or 'view'
+    q = """
+        SELECT name, type, sql
+        FROM sqlite_master
+            WHERE sql NOT NULL AND
+            type IN ('index', 'trigger', 'view')
+        """
+    schema_res = cu.execute(q)
+    for name, type, sql in schema_res.fetchall():
+        yield('%s;' % sql)
+
+    yield('COMMIT;')

Added: python/trunk/Lib/sqlite3/test/dump.py
==============================================================================
--- (empty file)
+++ python/trunk/Lib/sqlite3/test/dump.py	Fri Mar 28 21:11:49 2008
@@ -0,0 +1,52 @@
+# Author: Paul Kippes <kippesp at gmail.com>
+
+import unittest
+import sqlite3 as sqlite
+
+class DumpTests(unittest.TestCase):
+    def setUp(self):
+        self.cx = sqlite.connect(":memory:")
+        self.cu = self.cx.cursor()
+
+    def tearDown(self):
+        self.cx.close()
+
+    def CheckTableDump(self):
+        expected_sqls = [
+                "CREATE TABLE t1(id integer primary key, s1 text, " \
+                "t1_i1 integer not null, i2 integer, unique (s1), " \
+                "constraint t1_idx1 unique (i2));"
+                ,
+                "INSERT INTO \"t1\" VALUES(1,'foo',10,20);"
+                ,
+                "INSERT INTO \"t1\" VALUES(2,'foo2',30,30);"
+                ,
+                "CREATE TABLE t2(id integer, t2_i1 integer, " \
+                "t2_i2 integer, primary key (id)," \
+                "foreign key(t2_i1) references t1(t1_i1));"
+                ,
+                "CREATE TRIGGER trigger_1 update of t1_i1 on t1 " \
+                "begin " \
+                "update t2 set t2_i1 = new.t1_i1 where t2_i1 = old.t1_i1; " \
+                "end;"
+                ,
+                "CREATE VIEW v1 as select * from t1 left join t2 " \
+                "using (id);"
+                ]
+        [self.cu.execute(s) for s in expected_sqls]
+        i = self.cx.iterdump()
+        actual_sqls = [s for s in i]
+        expected_sqls = ['BEGIN TRANSACTION;'] + expected_sqls + \
+            ['COMMIT;']
+        [self.assertEqual(expected_sqls[i], actual_sqls[i])
+            for i in xrange(len(expected_sqls))]
+
+def suite():
+    return unittest.TestSuite(unittest.makeSuite(DumpTests, "Check"))
+
+def test():
+    runner = unittest.TextTestRunner()
+    runner.run(suite())
+
+if __name__ == "__main__":
+    test()