forked from expo/troggle
73 lines
2.9 KiB
Python
73 lines
2.9 KiB
Python
"""Used to create the SQL dump which mimics the import of cave and expo
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data from files.
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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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Every identifier in sql is quoted based on a comment in sqlite
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documentation "SQLite adds new keywords from time to time when it
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takes on new features. So to prevent your code from being broken by
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future enhancements, you should normally quote any identifier that
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is an English language word, even if you do not have to."
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"""
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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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ORDER BY "name"
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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','{0}','{0}',0,'{1}');".format(
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# qtable,
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# sql.replace("''")))
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else:
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yield(f'{sql};')
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# Build the insert statement for each row of the current table
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table_name_ident = table_name.replace('"', '""')
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res = cu.execute(f'PRAGMA table_info("{table_name_ident}")')
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column_names = [str(table_info[1]) for table_info in res.fetchall()]
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q = """SELECT 'INSERT INTO "{0}" VALUES({1})' FROM "{0}";""".format(
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table_name_ident,
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",".join("""'||quote("{0}")||'""".format(col.replace('"', '""')) for col in column_names))
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query_res = cu.execute(q)
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for row in query_res:
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yield(row[0]) # '{0}'.format(row[0]) had unicode errors
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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(f'{sql};')
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yield('COMMIT;') |