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