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authorKali Kaneko <kali@futeisha.org>2013-02-04 19:20:12 +0900
committerKali Kaneko <kali@futeisha.org>2013-02-04 19:20:12 +0900
commit4189e53a881e52de0945375a72b8748143c5bd13 (patch)
tree23ed8e0600dc3c62da7a95e50f778c79a9be1e75 /lib/dump.py
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+# Mimic the sqlite3 console shell's .dump command
+# Author: Paul Kippes <kippesp@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;')