gbase数据、南大通用产品文档：GBase8a

执行事务
通过设置连接参数中的autocommit=False 参数，即可控制事务，可通过连
接的commit 方法提交事务、rollback 方法回滚事务。
from GBaseConnector import connect, GBaseError
if __name__ == '__main__':
config = {'host':'172.16.0.131',
'user':'root',
'passwd':'111111',
'port':5258,
'db':'test',
'autocommit':False,}
try:
conn = connect()
conn.connect(**config)
cur = conn.cursor()
cur.execute("DROP PROCEDURE IF EXISTS test")
cur.execute("CREATE TABLE IF NOT EXISTS test(id INT, val VARCHAR(20))")
cur.execute("INSERT INTO test VALUES(1,'hello')")
conn.rollback()
cur.execute("INSERT INTO test VALUES(2,'world')")
conn.commit()
cur.execute("SELECT * FROM test")
print cur.fetchall()



GBase Python 接口开发手册
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- 15 -
cur.execute("DROP TABLE IF EXISTS test")
except GBaseError.DatabaseError, err:
print err
finally:
conn.close()
或者使用cur.execute("set autocommit=false")来开启一个事物。
from GBaseConnector import connect, GBaseError
if __name__ == '__main__':
config = {'host':'172.16.0.131',
'user':'root',
'passwd':'111111',
'port':5258,
'db':'test'}
try:
conn = connect()
conn.connect(**config)
cur = conn.cursor()
cur.execute("DROP PROCEDURE IF EXISTS test")
cur.execute("CREATE TABLE IF NOT EXISTS test(id INT, val VARCHAR(20))")
cur.execute("set autocommit=false")
cur.execute("INSERT INTO test VALUES(1,'hello')")
conn.rollback()
cur.execute("INSERT INTO test VALUES(2,'world')")
conn.commit()
cur.execute("SELECT * FROM test")
print cur.fetchall()
cur.execute("DROP TABLE IF EXISTS test")
except GBaseError.DatabaseError, err:
print err
finally:
conn.close()

DECLARE
i NUMBER := 5;
BEGIN
FOR i IN 1..3 LOOP
DBMS_OUTPUT.PUT_LINE ('Inside loop, i is ' || TO_CHAR(i));
END LOOP;
DBMS_OUTPUT.PUT_LINE ('Outside loop, i is ' || TO_CHAR(i));
END;

--Result:
--Inside loop, i is 1
--Inside loop, i is 2
--Inside loop, i is 3
--Outside loop, i is 5

示例
[gbase@gbasehost ~]$ gs_basebackup -D /home/test/trunk/install/data/backup -p
5432
INFO:
The starting position of the xlog copy of the full build is: 0/1B800000.
The slot minimum LSN is: 0/1B800000.