Question

如何获取此SQL查询的等效SQLAlchemy语句？

select CONVERT(blobby USING utf8) as blobby from myTable where CONVERT(blobby USING utf8)="Hello";

其中 blobby 是一个blob类型字段，必须是unblobbed到字符串。

我试过这个

DBSession.query(myTable).filter(myTable.blobby.encode(utf-8)="Hello").first()

但是不起作用。给出一个奇怪的错误

AttributeError: Neither 'InstrumentedAttribute' object nor 'Comparator' object associated with myTable.blobby has an attribute 'encode'

此外，我尝试按如下方式插入数据库：

que=myTable(blobby=str(x.blobby))
DBSession.add(que)

这也会返回错误

(ProgrammingError) You must not use 8-bit bytestrings unless you use a text_factory that can interpret 8-bit bytestrings (like text_factory = str). It is highly recommended that you instead just switch your application to Unicode strings.

如果我插入

，则此错误消失

que=myTable(blobby=str(x))

但插入的条目不支持外语值..

 EDIT:-

这就是我想要做的事情：

I have a list of utf-8 strings. The sqlalchemy column which I am
trying to insert my string has the property "convert_unicode" set to
true. Now, I have to insert these strings into my database without
loss of data. I need to preserve my multilingual characters which
worked fine when I fetched them as utf-8 from my Mysql database.
Trouble here is inserting them into SQLite using SQLalchemy.

请帮忙。谢谢和问候。

Answer 1

所以这就是我为摆脱编码地狱所做的一切，以及这个错误。

UnicodeDecodeError: 'ascii' codec
can't decode byte 0xc4 in position
10: ordinal not in range(128)

我将逐步解释。

使用此命令：type(mydirtyunicodestring)。
如果它返回那么这意味着你必须将它转换为unicode才能获得摆脱错误。（字节串!!!!）
使用dirtystring.decode('utf-8') 或任何其他格式让你的类型到那里走。不再有ProgrammingError) You must not use 8-bit bytestrings unless you use a text_factory that can interpret 8-bit bytestrings (like text_factory = str).

SQLAlchemy使用utf8转换字段

1 个答案: