Question

query = "SELECT" + " e.id AS _id," + " ke.id AS ke_id,"
            + " ke.fk as ke_fk," + " ke.value as ke_value,"
            + " re.id AS ke_id," + " re.fk as re_fk,"
            + " re.value as re_value," + " s.id AS  s_id,"
            + " s.fk as s_fk," + " g.id AS g_id," + " g.fk as g_fk,"
            + " g.lang," + " g.value as g_value" + " FROM entry e"
            + "     INNER JOIN k_ele ke ON e.id = ke.fk"
            + "     INNER JOIN r_ele re ON e.id = re.fk"
            + "     INNER JOIN sense s ON e.id = s.fk"
            + "     INNER JOIN gloss g ON s.id = g.fk"
            + " WHERE re.value like '" + hiragana
            + "%' OR g.value like '" + lookingFor
            + "%' OR g.value like '%" + strSpace + lookingFor
            + "%' GROUP BY s.id LIMIT 5 ";

此查询从SQLite数据库获取数据，并将获取的数据放入listview。即使我已经使用LIMIT 5，它的工作速度也很慢。为了使搜索工作更快，应该做些什么？

Answer 1

不是SQLLite专家，但这些是我从其他数据库的经验中看到的类型。你可能需要体验一下。

首先检查您的索引。接下来你真的需要一个通配符作为第一个字符吗？这通常会使大多数数据库实现中的查询变慢，因为它不允许您在该特定字段上使用索引。我还可以指出，在许多数据库中，UNION或UNION ALL查询比在WHERE clasue中使用OR要快得多。

Answer 2

减少where子句的连接数和/或条件。您可以将所有数据放入内存并使用java将所需的结果集减少到您想要的结果集。

Answer 3

我认为复杂的处理必须在服务器端完成。

如何快速优化搜索查询工作？

3 个答案: