Android SQLite查询列不为空且不为空

I cannot figure out the syntax for the .query call. I need to select all records that match a certain column that do not have a null or empty value for a second (different) column

我无法弄清楚.query调用的语法。我需要选择与某个列匹配的所有记录，这些列对于第二个（不同的）列没有空值或空值

my best attempt:

我最好的尝试：

Cursor cursor = mDatabase.query(DatabaseOpenHelper.TABLE_ROOMS, mAllColumns,
    DatabaseOpenHelper.KEY_ROOM_HOSPITAL_ID
    + " =? AND " + DatabaseOpenHelper.KEY_ISO + " IS NOT NULL OR NOT ?",
    new String[]{String.valueOf(hospitalId), ""}, null, null, null);

This is returning ALL records. If I use AND in place of OR, it returns records matching hospitalId, but ignores the NOT NULL OR NOT "" part.

这将返回所有记录。如果我使用AND代替OR，它返回与hospitalId匹配的记录，但忽略NOT NULL或NOT“”部分。

Any tips? Should I use a rawQuery call? Thank you.

有小费吗？我应该使用rawQuery调用吗？谢谢。

1 个解决方案

#1

I believe the correct syntax would be:

我相信正确的语法是：

AND key IS NOT NULL AND key != ""

where key is your column

其中key是你的专栏

#1