androidx房间多匹配

Question

我对 androidx.room 有疑问。我正在尝试在查询中使用多个 MATCH

@SuppressWarnings(RoomWarnings.CURSOR_MISMATCH)
@Query("SELECT * FROM tests WHERE task MATCH :words OR task MATCH :words2")
Maybe<List<Test>> getByWordsInTask(String words, String words2);

但它仅适用于 android 8+，在 7 上显示异常

E/SQLiteLog: (1) statement aborts at 7: [SELECT * FROM tests WHERE task MATCH ? OR task MATCH ?] unable to use function MATCH in the requested context
E/SQLiteQuery: exception: unable to use function MATCH in the requested context (code 1); query: SELECT * FROM tests WHERE task MATCH ? OR task MATCH ?

有什么建议吗？

Answer 1

MATCH 是特殊的 function/keyword，除了在 FTS 中使用外没有实现（可以使用 MATCH 的 Room 支持 3 或 4），根据

The MATCH operator is a special syntax for the match() application-defined function. The default match() function implementation raises an exception and is not really useful for anything. But extensions can override the match() function with more helpful logic.

https://sqlite.org/lang_expr.html#the_like_glob_regexp_and_match_operators

您将需要一个替代方法，也许是 instr 标量函数，也许是 LIKE.

I use FTS 4, all is working good when I use single MATCH, but if I use OR and 2 MATCH operators (I need it for fast, but more extended search) it works only on Android 8 and higher. I can not understand.

尝试"SELECT * FROM tests WHERE task MATCH :allwords"

其中 allwords 是用 OR（或适当的运算符）分隔的所有单词，例如说 words 是 *Fred 和 words2 是 *Mary那么 allwords 将是 Fred OR Mary;
如果可行，则可能是 Room 问题，如果是，则可能将其报告为错误

androidx房间多匹配

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