Mysql Sqlalchemy类\u MatchType（sqltypes.Float，sqltypes.MatchType）：AttributeError

有时执行查询时出现以下错误：

ct = db.session.query(CIType).filter(
                CIType.type_name == key).first() or \
                db.session.query(CIType).filter(CIType.type_id == key).first()

完整错误信息

2016-08-11 14:27:26,177 ERROR /usr/lib/python2.6/site-packages/flask/app.py 1306 - Exception on /api/v0.1/projects/search-indexer-rafael/product [GET]
    Traceback (most recent call last):
File "/usr/lib/python2.6/site-packages/flask/app.py", line 1687, in wsgi_app
    response = self.full_dispatch_request()
File "/usr/lib/python2.6/site-packages/flask/app.py", line 1360, in full_dispatch_request
    rv = self.handle_user_exception(e)
File "/usr/lib/python2.6/site-packages/flask/app.py", line 1358, in full_dispatch_request
    rv = self.dispatch_request()
File "/usr/lib/python2.6/site-packages/flask/app.py", line 1344, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
File "/data/webapps/cmdb-api/core/special.py", line 175, in get_project_product
    product = ProjectManager().get_for_product(project_name)
File "/data/webapps/cmdb-api/lib/special/project.py", line 18, in __init__
    self.ci_type = CITypeCache.get("project")
File "/data/webapps/cmdb-api/models/cmdb.py", line 458, in get
    ct = db.session.query(CIType).filter(
File "/usr/lib64/python2.6/site-packages/sqlalchemy/orm/scoping.py", line 149, in do
    def do(self, *args, **kwargs):
File "/usr/lib64/python2.6/site-packages/sqlalchemy/util/_collections.py", line 903, in __call__
    item = dict.get(self, key)
File "/usr/lib/python2.6/site-packages/flask_sqlalchemy.py", line 201, in __init__
    bind=db.engine,
File "/usr/lib/python2.6/site-packages/flask_sqlalchemy.py", line 754, in engine
    return self.get_engine(self.get_app())
File "/usr/lib/python2.6/site-packages/flask_sqlalchemy.py", line 771, in get_engine
    return connector.get_engine()
File "/usr/lib/python2.6/site-packages/flask_sqlalchemy.py", line 451, in get_engine
    self._engine = rv = sqlalchemy.create_engine(info, **options)
File "/usr/lib64/python2.6/site-packages/sqlalchemy/engine/__init__.py", line 344, in create_engine
    of 0 indicates no limit; to disable pooling, set ``poolclass`` to
File "/usr/lib64/python2.6/site-packages/sqlalchemy/engine/strategies.py", line 50, in create

File "/usr/lib64/python2.6/site-packages/sqlalchemy/engine/url.py", line 116, in get_dialect
    return self.get_dialect().driver
File "/usr/lib64/python2.6/site-packages/sqlalchemy/util/langhelpers.py", line 170, in load
    fn.__func__.__doc__ = doc
File "/usr/lib64/python2.6/site-packages/sqlalchemy/dialects/__init__.py", line 33, in _auto_fn
    try:
File "/usr/lib64/python2.6/site-packages/sqlalchemy/dialects/mysql/__init__.py", line 8, in <module>
    from . import base, mysqldb, oursql, \
File "/usr/lib64/python2.6/site-packages/sqlalchemy/dialects/mysql/base.py", line 681, in <module>
    class _MatchType(sqltypes.Float, sqltypes.MatchType):
AttributeError: 'module' object has no attribute 'MatchType'

然后

sqlalchemy的版本是sqlalchemy-1.0.8-py2.6.egg-info

2016-08-11 14:27:26,177 ERROR /usr/lib/python2.6/site-packages/flask/app.py 1306 - Exception on /api/v0.1/projects/search-indexer-rafael/product [GET]
    Traceback (most recent call last):
File "/usr/lib/python2.6/site-packages/flask/app.py", line 1687, in wsgi_app
    response = self.full_dispatch_request()
File "/usr/lib/python2.6/site-packages/flask/app.py", line 1360, in full_dispatch_request
    rv = self.handle_user_exception(e)
File "/usr/lib/python2.6/site-packages/flask/app.py", line 1358, in full_dispatch_request
    rv = self.dispatch_request()
File "/usr/lib/python2.6/site-packages/flask/app.py", line 1344, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
File "/data/webapps/cmdb-api/core/special.py", line 175, in get_project_product
    product = ProjectManager().get_for_product(project_name)
File "/data/webapps/cmdb-api/lib/special/project.py", line 18, in __init__
    self.ci_type = CITypeCache.get("project")
File "/data/webapps/cmdb-api/models/cmdb.py", line 458, in get
    ct = db.session.query(CIType).filter(
File "/usr/lib64/python2.6/site-packages/sqlalchemy/orm/scoping.py", line 149, in do
    def do(self, *args, **kwargs):
File "/usr/lib64/python2.6/site-packages/sqlalchemy/util/_collections.py", line 903, in __call__
    item = dict.get(self, key)
File "/usr/lib/python2.6/site-packages/flask_sqlalchemy.py", line 201, in __init__
    bind=db.engine,
File "/usr/lib/python2.6/site-packages/flask_sqlalchemy.py", line 754, in engine
    return self.get_engine(self.get_app())
File "/usr/lib/python2.6/site-packages/flask_sqlalchemy.py", line 771, in get_engine
    return connector.get_engine()
File "/usr/lib/python2.6/site-packages/flask_sqlalchemy.py", line 451, in get_engine
    self._engine = rv = sqlalchemy.create_engine(info, **options)
File "/usr/lib64/python2.6/site-packages/sqlalchemy/engine/__init__.py", line 344, in create_engine
    of 0 indicates no limit; to disable pooling, set ``poolclass`` to
File "/usr/lib64/python2.6/site-packages/sqlalchemy/engine/strategies.py", line 50, in create

File "/usr/lib64/python2.6/site-packages/sqlalchemy/engine/url.py", line 116, in get_dialect
    return self.get_dialect().driver
File "/usr/lib64/python2.6/site-packages/sqlalchemy/util/langhelpers.py", line 170, in load
    fn.__func__.__doc__ = doc
File "/usr/lib64/python2.6/site-packages/sqlalchemy/dialects/__init__.py", line 33, in _auto_fn
    try:
File "/usr/lib64/python2.6/site-packages/sqlalchemy/dialects/mysql/__init__.py", line 8, in <module>
    from . import base, mysqldb, oursql, \
File "/usr/lib64/python2.6/site-packages/sqlalchemy/dialects/mysql/base.py", line 681, in <module>
    class _MatchType(sqltypes.Float, sqltypes.MatchType):
AttributeError: 'module' object has no attribute 'MatchType'

---

在经历了许多相同的错误之后，我再也不能抓住这个错误了。此错误的原因是什么？

我假设CIType.type\u name和CIType.type\u id具有不同的数据类型（可能是字符串和数字类型）。可能导致以下情况：

db.session.query(CIType).filter(CIType.type_name == key).first()

是有效的表达式，但：

db.session.query(CIType).filter(CIType.type_id == key).first()

由于类型不匹配而产生错误。您需要在此表达式中将key转换为type\u id列类型

当第一个表达式不返回任何结果时，将计算第二个表达式。如所述：

表达式

x或y

首先计算x；如果x为true，则返回其值；否则，计算y并返回结果值

例如：

>>> a = 1 or 2 + '2'
>>> print a
1
>>> a = 0 or 2 + '2'
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: unsupported operand type(s) for +: 'int' and 'str'

>a=1或2+2'
>>>打印
1.
>>>a=0或2+“2”
回溯（最近一次呼叫最后一次）：
文件“”，第1行，在
TypeError:不支持+：“int”和“str”的操作数类型

我假设CIType.type\u name和CIType.type\u id具有不同的数据类型（可能是字符串和数字类型）。可能导致以下情况：

db.session.query(CIType).filter(CIType.type_name == key).first()

是有效的表达式，但：

db.session.query(CIType).filter(CIType.type_id == key).first()

由于类型不匹配而产生错误。您需要在此表达式中将key转换为type\u id列类型

当第一个表达式不返回任何结果时，将计算第二个表达式。如所述：

表达式

x或y

首先计算x；如果x为true，则返回其值；否则，计算y并返回结果值

例如：

>>> a = 1 or 2 + '2'
>>> print a
1
>>> a = 0 or 2 + '2'
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: unsupported operand type(s) for +: 'int' and 'str'

>a=1或2+2'
>>>打印
1.
>>>a=0或2+“2”
回溯（最近一次呼叫最后一次）：
文件“”，第1行，在
TypeError:不支持+：“int”和“str”的操作数类型

谢谢您的回答！很抱歉，我之前没有提供所有信息，现在我提供了代码和所有调用堆栈。所以可能不是您描述的情况。@SkyWay您是否也可以发布CIType定义？正如您假设的：实际上

type\u name

是字符串，

type\u id

是整数。但是函数调用为

CITypeCache.get（“项目”）

，在这种情况下，它将执行语句

db.session.query（CIType）.filter（CIType.type\u name==key）.first（）

。此外，表达式中没有浮点类型。@SkyWay

或

关键字的工作方式不同：有时

db.session.query（CIType）.filter（CIType.type\u id==key）。first（）

也会被计算，并可能导致此错误。我在回答中补充了更多的解释。有点不同：这是MySQL中浮动的比较结果类型。谢谢，我知道你所说的情况是可能的。但是现在我测试了

db.session.query（CIType）.filter（CIType.type\u name==key）.first（）

和

db.session.query（CIType.type\u id==key）.filter（CIType.type\u id==key）.first（）

在key为字符串和整数的同时，并且没有发生任何错误。谢谢您的回答！很抱歉，我之前没有提供所有信息，现在我提供了代码和所有调用堆栈。所以可能不是您描述的情况。@SkyWay您是否也可以发布CIType定义？正如您假设的：实际上

type\u name

是字符串，

type\u id

是整数。但是函数调用为

CITypeCache.get（“项目”）

，在这种情况下，它将执行语句

db.session.query（CIType）.filter（CIType.type\u name==key）.first（）

。此外，表达式中没有浮点类型。@SkyWay

或

关键字的工作方式不同：有时

db.session.query（CIType）.filter（CIType.type\u id==key）。first（）

也会被计算，并可能导致此错误。我在回答中补充了更多的解释。有点不同：这是MySQL中浮动的比较结果类型。谢谢，我知道你所说的情况是可能的。但是现在我测试了

db.session.query（CIType）.filter（CIType.type\u name==key）.first（）

和

db.session.query（CIType.type\u id==key）.filter（CIType.type\u id==key）.first（）

在key为字符串和整数的同时，并且没有发生任何错误。