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我已经使用sqlalchemy(我的底层数据库是PostgreSQL 8.4)编写了以下函数。 我有以下模式:sqlalchemy错误地删除行
CREATE TABLE temporary_data_key (
id SERIAL PRIMARY KEY,
key VARCHAR(36) NOT NULL
);
CREATE UNIQUE INDEX idxu_temp_data_nm ON temporary_data_key (key);
CREATE TABLE temporary_data (
key_id INTEGER REFERENCES temporary_data_key(id) ON UPDATE CASCADE ON DELETE RESTRICT NOT NULL,
id_value INTEGER CHECK (id_value > 0) NOT NULL
);
我期待的功能,清理后本身(即删除temporary_table_key表生成的密钥),如果出现错误 - 由于某种原因,该表中没有被清除时发生异常。
下面是函数:
def storeIdsInTemporaryTable(dbinfo, id_list):
conn = dbinfo['db_connection']
metadata = dbinfo['metadata']
tableinfo = Table('temporary_data', metadata, autoload=True)
datarows = []
temp_dbinfo = {'db_connection': conn, 'table': tableinfo, 'datarows': datarows }
guid = genutils.getGUID()
sql = "INSERT INTO temporary_data_key (key) VALUES ('{0}') RETURNING id".format(guid)
key_id = executeSQLonDbConnection(temp_dbinfo, sql, return_field='id')
for id_value in id_list:
datarows.append({ 'key_id': key_id, 'id_value': id_value })
try:
insertToDb(temp_dbinfo)
except Exception as e:
print 'ERROR:',e
guid = None # to indicate an error occured
if key_id:
conn.execute("DELETE FROM temporary_data_key WHERE key='{0}'".format(key_id))
return guid
任何人都可以找出为什么功能不清理temporary_data密钥,作为例外处理部分?