Python 如何按字符串长度过滤'sqlalchemy'?

Python 如何按字符串长度过滤'sqlalchemy'?,python,sqlalchemy,Python,Sqlalchemy,如何按字符串长度筛选sqlalchemy 此代码段: sess.query(db.ArticlesTable).filter(or_( and_(db.ArticlesTable.shorttext.length > 0), ... 给了我以下错误: File "./aggregate_news.py", line 69, in is_acceptable db.ArticlesTable.shorttext.length > 0), File

如何按字符串长度筛选
sqlalchemy

此代码段:

sess.query(db.ArticlesTable).filter(or_(
    and_(db.ArticlesTable.shorttext.length > 0),
         ...
给了我以下错误:

File "./aggregate_news.py", line 69, in is_acceptable
    db.ArticlesTable.shorttext.length > 0),
  File ".../sqlalchemy/orm/attributes.py", line 211, in __getattr__
    key)
AttributeError: Neither 'InstrumentedAttribute' object nor 'Comparator' 
    object associated with ArticlesTable.shorttext has an attribute 'length'
其中,
ArticlesTable
为:

class ArticlesTable(Base):
    __tablename__ = TABLE_ARTICLES
    id = Column(Integer, primary_key=True)
    shorttext = Column(String)
    ...
您需要使用创建
LENGTH()
函数:

from sqlalchemy.sql.expression import func

sess.query(db.ArticlesTable).filter(or_(
    and_(func.length(db.ArticlesTable.shorttext) > 0),