rollback.py :
def write_to_db(dataset_id):
try:
initialize_datamodels()
EpdUmpPushRollback = datamodels.relational_tables.EpdUmpPushRollback
with session_scope() as session:
epdumppushrollback_obj = EpdUmpPushRollback()
epdumppushrollback_obj.dataset_id = dataset_id
epdumppushrollback_obj.record_id = ''
epdumppushrollback_obj.operator_name = 'vis'
epdumppushrollback_obj.activation_flag = 'active'
epdumppushrollback_obj.record_creation_time = now()
epdumppushrollback_obj.start_time = now()
session.add(epdumppushrollback_obj)
session.flush()
except Exception as e:
#err = "Error in updating the table epd_ump_push_rollback "
#_log.exception(err)
_log.exception("Error in updating the table {}".format(e))
table.py :
"""epd_ump_push_rollback_table
Revision ID: 4e4d99a8e544
Revises: c010f4d4b319
Create Date: 2018-12-19 18:04:30.271380
"""
from alembic import op
from sqlalchemy import Column, String, INTEGER, VARCHAR, NVARCHAR, TIMESTAMP, \
Enum, ForeignKey, Sequence, MetaData
# revision identifiers, used by Alembic.
revision = '4e4d99a8e544'
down_revision = '2396e1b7de5c'
branch_labels = None
depends_on = None
meta = MetaData()
seq_obj = Sequence('record_id_seq', metadata=meta)
def upgrade():
activation_flag_state = Enum('active', 'inactive', name="activation_flag_state")
op.create_table('epd_ump_push_rollback',
Column('dataset_id', String, ForeignKey('epd_ip_dataset.dataset_id'),
primary_key=True),
Column('record_id', INTEGER, seq_obj, server_default=seq_obj.next_value(),
primary_key=True),
Column('operator_name', String, nullable=False),
Column('activation_flag', activation_flag_state, nullable=False),
Column('record_creation_time', TIMESTAMP),
Column('start_time', TIMESTAMP),
Column('end_time', TIMESTAMP))
def downgrade():
op.drop_table('epd_ump_push_rollback')
op.execute('DROP type activation_flag_state')
说明:
在rollback.py
文件中,我正在写入db。我正在使用db(postgresql)
与with session_scope() as session:
进行会话。我正在创建表EpdUmpPushRollback
的对象,并适当设置这些值。 record_id
列应作为我在table.py
中定义的序列生成,并且我正在使用alembic将架构升级到具有表EpdUmpPushRollback
的新架构。
我现在有两个问题。
pdumppushrollback_obj.record_id = ''
添加,还是必须自动添加?错误:sqlalchemy.exc.ProgrammingError:(psycopg2.ProgrammingError) “ record_id_seq”不是序列[SQL:'INSERT INTO epd_ump_push_rollback(dataset_id,operator_name,activation_flag, record_creation_time,start_time,end_time)VALUES(%(dataset_id)s, %(operator_name)s,%(activation_flag)s,now(),now(),%(end_time)s) 返回epd_ump_push_rollback.record_id'] [参数: {'dataset_id':'20181221_1200_mno','operator_name':'vis', 'activation_flag':'活动','end_time':无}]]
答案 0 :(得分:0)
我已经遇到了这个问题,为了解决这个问题,我创建了序列,因此您可以尝试以下postgres语句:
CREATE SEQUENCE record_id_seq
START WITH 1
INCREMENT BY 1
NO MINVALUE
NO MAXVALUE
CACHE 1;
答案 1 :(得分:0)
线
seq_obj = Sequence('record_id_seq', metadata=meta)
还不够。
您需要在 upgrade()
中的表创建上方添加:
op.execute(schema.CreateSequence(seq_obj))
此外,downgrade()
函数中需要放置序列