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python - 使用 Flask 和 sqlalchemy 插入到 Db2

转载 作者:行者123 更新时间:2023-12-01 09:17:36 25 4
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我有一个包含 sqlalchemy 的 Flask 应用程序。运行manage db initmanage db migratemanage db Upgrade工作得很好。所以在db2上创建表没有任何问题。当我尝试插入时,出现各种错误。

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Traceback (most recent call last):
File "*path*/lib/python3.6/site-packages/ibm_db_dbi.py", line 1258, in _execute_helper
return_value = ibm_db.execute(self.stmt_handler, parameters)
Exception: Binding Error:

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "/Users/sebastianlindblom/Documents/GrowSmarter/metrolive-api-env/lib/python3.6/site-packages/sqlalchemy/engine/base.py", line 1193, in _execute_context
context)
File "/Users/sebastianlindblom/Documents/GrowSmarter/metrolive-api-env/lib/python3.6/site-packages/ibm_db_sa/ibm_db.py", line 107, in do_execute
cursor.execute(statement, parameters)
File "/Users/sebastianlindblom/Documents/GrowSmarter/metrolive-api-env/lib/python3.6/site-packages/ibm_db_dbi.py", line 1356, in execute
self._execute_helper(parameters)
File "/Users/sebastianlindblom/Documents/GrowSmarter/metrolive-api-env/lib/python3.6/site-packages/ibm_db_dbi.py", line 1268, in _execute_helper
raise self.messages[len(self.messages) - 1]
ibm_db_dbi.DatabaseError: ibm_db_dbi::DatabaseError: Binding Error:

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
File "/Users/sebastianlindblom/Documents/GrowSmarter/metrolive-api-env/lib/python3.6/site-packages/flask/app.py", line 1813, in full_dispatch_request
rv = self.dispatch_request()
File "/Users/sebastianlindblom/Documents/GrowSmarter/metrolive-api-env/lib/python3.6/site-packages/flask/app.py", line 1799, in dispatch_request
return self.view_functions[rule.endpoint](**req.view_args)
File "/Users/sebastianlindblom/Documents/GrowSmarter/metrolive-api-env/lib/python3.6/site-packages/flask_restplus/api.py", line 319, in wrapper
resp = resource(*args, **kwargs)
File "/Users/sebastianlindblom/Documents/GrowSmarter/metrolive-api-env/lib/python3.6/site-packages/flask/views.py", line 88, in view
return self.dispatch_request(*args, **kwargs)
File "/Users/sebastianlindblom/Documents/GrowSmarter/metrolive-api-env/lib/python3.6/site-packages/flask_restplus/resource.py", line 44, in dispatch_request
resp = meth(*args, **kwargs)
File "/Users/sebastianlindblom/Documents/GrowSmarter/metrolive-api/app/api.py", line 37, in get
snp.sensor_info()
File "/Users/sebastianlindblom/Documents/GrowSmarter/metrolive-api/app/network.py", line 123, in sensor_info
db_session.commit()
File "/Users/sebastianlindblom/Documents/GrowSmarter/metrolive-api-env/lib/python3.6/site-packages/sqlalchemy/orm/scoping.py", line 153, in do
return getattr(self.registry(), name)(*args, **kwargs)
File "/Users/sebastianlindblom/Documents/GrowSmarter/metrolive-api-env/lib/python3.6/site-packages/sqlalchemy/orm/session.py", line 943, in commit
self.transaction.commit()
File "/Users/sebastianlindblom/Documents/GrowSmarter/metrolive-api-env/lib/python3.6/site-packages/sqlalchemy/orm/session.py", line 467, in commit
self._prepare_impl()
File "/Users/sebastianlindblom/Documents/GrowSmarter/metrolive-api-env/lib/python3.6/site-packages/sqlalchemy/orm/session.py", line 447, in _prepare_impl
self.session.flush()
File "/Users/sebastianlindblom/Documents/GrowSmarter/metrolive-api-env/lib/python3.6/site-packages/sqlalchemy/orm/session.py", line 2254, in flush
self._flush(objects)
File "/Users/sebastianlindblom/Documents/GrowSmarter/metrolive-api-env/lib/python3.6/site-packages/sqlalchemy/orm/session.py", line 2380, in _flush
transaction.rollback(_capture_exception=True)
File "/Users/sebastianlindblom/Documents/GrowSmarter/metrolive-api-env/lib/python3.6/site-packages/sqlalchemy/util/langhelpers.py", line 66, in __exit__
compat.reraise(exc_type, exc_value, exc_tb)
File "/Users/sebastianlindblom/Documents/GrowSmarter/metrolive-api-env/lib/python3.6/site-packages/sqlalchemy/util/compat.py", line 187, in reraise
raise value
File "/Users/sebastianlindblom/Documents/GrowSmarter/metrolive-api-env/lib/python3.6/site-packages/sqlalchemy/orm/session.py", line 2344, in _flush
flush_context.execute()
File "/Users/sebastianlindblom/Documents/GrowSmarter/metrolive-api-env/lib/python3.6/site-packages/sqlalchemy/orm/unitofwork.py", line 391, in execute
rec.execute(self)
File "/Users/sebastianlindblom/Documents/GrowSmarter/metrolive-api-env/lib/python3.6/site-packages/sqlalchemy/orm/unitofwork.py", line 556, in execute
uow
File "/Users/sebastianlindblom/Documents/GrowSmarter/metrolive-api-env/lib/python3.6/site-packages/sqlalchemy/orm/persistence.py", line 181, in save_obj
mapper, table, insert)
File "/Users/sebastianlindblom/Documents/GrowSmarter/metrolive-api-env/lib/python3.6/site-packages/sqlalchemy/orm/persistence.py", line 830, in _emit_insert_statements
execute(statement, multiparams)
File "/Users/sebastianlindblom/Documents/GrowSmarter/metrolive-api-env/lib/python3.6/site-packages/sqlalchemy/engine/base.py", line 948, in execute
return meth(self, multiparams, params)
File "/Users/sebastianlindblom/Documents/GrowSmarter/metrolive-api-env/lib/python3.6/site-packages/sqlalchemy/sql/elements.py", line 269, in _execute_on_connection
return connection._execute_clauseelement(self, multiparams, params)
File "/Users/sebastianlindblom/Documents/GrowSmarter/metrolive-api-env/lib/python3.6/site-packages/sqlalchemy/engine/base.py", line 1060, in _execute_clauseelement
compiled_sql, distilled_params
File "/Users/sebastianlindblom/Documents/GrowSmarter/metrolive-api-env/lib/python3.6/site-packages/sqlalchemy/engine/base.py", line 1200, in _execute_context
context)
File "/Users/sebastianlindblom/Documents/GrowSmarter/metrolive-api-env/lib/python3.6/site-packages/sqlalchemy/engine/base.py", line 1413, in _handle_dbapi_exception
exc_info
File "/Users/sebastianlindblom/Documents/GrowSmarter/metrolive-api-env/lib/python3.6/site-packages/sqlalchemy/util/compat.py", line 203, in raise_from_cause
reraise(type(exception), exception, tb=exc_tb, cause=cause)
File "/Users/sebastianlindblom/Documents/GrowSmarter/metrolive-api-env/lib/python3.6/site-packages/sqlalchemy/util/compat.py", line 186, in reraise
raise value.with_traceback(tb)
File "/Users/sebastianlindblom/Documents/GrowSmarter/metrolive-api-env/lib/python3.6/site-packages/sqlalchemy/engine/base.py", line 1193, in _execute_context
context)
File "/Users/sebastianlindblom/Documents/GrowSmarter/metrolive-api-env/lib/python3.6/site-packages/ibm_db_sa/ibm_db.py", line 107, in do_execute
cursor.execute(statement, parameters)
File "/Users/sebastianlindblom/Documents/GrowSmarter/metrolive-api-env/lib/python3.6/site-packages/ibm_db_dbi.py", line 1356, in execute
self._execute_helper(parameters)
File "/Users/sebastianlindblom/Documents/GrowSmarter/metrolive-api-env/lib/python3.6/site-packages/ibm_db_dbi.py", line 1268, in _execute_helper
raise self.messages[len(self.messages) - 1]
sqlalchemy.exc.DatabaseError: (ibm_db_dbi.DatabaseError) ibm_db_dbi::DatabaseError: Binding Error: [SQL: 'INSERT INTO "schema"."table" (sensor_id, code, lat, lon, x, y) VALUES (?, ?, ?, ?, ?, ?)'] [parameters: (2855, 30, 59.291658, 18.077241, 411.59730406100783, 769.5522643844229)] (Background on this error at: http://sqlalche.me/e/4xp6)

模型看起来像:

class Sensor(Base):
__tablename__ = 'table'
__table_args__ = {'schema':'schema'}

sensor_id = db.Column(db.Integer, primary_key=True)
code = db.Column(db.Integer, unique=True, nullable=False)
lat = db.Column(db.Float, unique=True, nullable=False)
lon = db.Column(db.Float, unique=True, nullable=False)
x = db.Column(db.Float, unique=True, nullable=False)
y = db.Column(db.Float, unique=True, nullable=False)

def __repr__(self):
return '<Sensor %r, x=%r, y=%r>' % self.code % self.x % self.y

插入代码如下所示:

    from .models import Sensor
from .database import db_session
ins = Sensor(sensor_id = sensor_coords['sensor_code'][0],
code = sensor_coords['sensor'][0],
lat = sensor_coords['lat'][0],
lon = sensor_coords['long'][0],
x = sensor_coords['x'][0],
y = sensor_coords['y'][0])
db_session.add(ins)
db_session.commit()

查看错误消息,这就是它尝试绑定(bind)sql语句的方式:[SQL: 'INSERT INTO "schema"."table"(sensor_id, code, lat, lon, x, y) VALUES (?, ?, ?, ?, ?, ?)'] [参数:(2855 , 30, 59.291658, 18.077241, 411.59730406100783, 769.5522643844229)]哪个看起来正确? (模式和表名称被替换)。

我的database.py看起来像:

from sqlalchemy import create_engine
from sqlalchemy.orm import scoped_session, sessionmaker
from sqlalchemy.ext.declarative import declarative_base
import ibm_db_sa

from app.api import app

engine = create_engine(app.config['SQLALCHEMY_DATABASE_URI'], convert_unicode=True)


db_session = scoped_session(sessionmaker(autocommit=False,
autoflush=False,
bind=engine))
Base = declarative_base()
Base.query = db_session.query_property()

def init_db():
Base.metadata.create_all(bind=engine)

我不知道出了什么问题。插入格式看起来正确吗?

感谢我能得到的所有帮助。谢谢!

最佳答案

开始工作了!

必须将插入代码中的类型转换为:

ins = Sensor(sensor_id = int(sensor_coords['sensor_code'][0]),
code = int(sensor_coords['sensor'][0]),
lat = float(sensor_coords['lat'][0]),
lon = float(sensor_coords['long'][0]),
x = float(sensor_coords['x'][0]),
y = float(sensor_coords['y'][0]))

没有意识到 numpy 使用自己的 int 和 float 类型...

关于python - 使用 Flask 和 sqlalchemy 插入到 Db2,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/51098540/

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