如何在android中使用rawQuery()
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时间：2020-08-20 03:20:59 来源:igfitidea点击:
How to use rawQuery() in android
提问by Dennie
I have a sql query like this
我有一个像这样的 sql 查询
String loadFav = "SELECT _id, title, name, favorite FROM table1 where favorite= 1 "
+ "UNION ALL"
+ "SELECT _id, title, name, favorite FROM table2 where favorite= 1"
;
Cursor mCursor = mSQLiteDatabase.rawQuery(loadFav, null);
I got an error when run this query. Is it right structure? Can someone help me?
运行此查询时出现错误。是正确的结构吗？有人能帮我吗？
回答by Bill Karwin
Always troubleshoot by looking at the SQL string -- not the code that builds the SQL string!
总是通过查看 SQL 字符串来排除故障——而不是构建 SQL 字符串的代码！
SELECT _id, title, name, favorite FROM table1 where favorite= 1 UNION ALLSELECT _id, title, name, favorite FROM table2 where favorite= 1
You need a space between ALLand the second SELECT.
您需要在ALL和 第二个之间留一个空格SELECT。
