在sqlite SELECT FROM中搜索多列

Question

我使用这段代码来搜索A列，如果我想同时搜索A列和B列，我应该做什么修改？

String sql = "SELECT * FROM " + TABLE_NAME +
                " WHERE " + ColumnA + " LIKE ? ORDER BY " + ColumnA + " LIMIT 100";

我已经尝试过，但不起作用：

String sql = "SELECT * FROM " + TABLE_NAME +
                " WHERE " + ColumnA + " LIKE ? ORDER BY " + ColumnA + " LIMIT 100 OR SELECT * FROM " + TABLE_NAME +
                " WHERE " + ColumnB + " LIKE ? ORDER BY " + ColumnB + " LIMIT 100";

我有什么错误吗？

Answer 1

您可以使用 OR 连接两个表达式。 但是，两者都必须是完整的表达式：

SELECT ... WHERE ColA LIKE ? OR ColB LIKE ? ...

Answer 2

您是否在寻找 UNION 而不是 OR？ http://www.tutorialspoint.com/sqlite/sqlite_unions_clause.htm

Answer 3

进行两个不同的查询。并通过

union

关键字合并结果。

select * from TABLE_NAME where columnA like ? order by columnA limit 100
union
select * from TABLE_NAME where columnB like ? order by columnA limit 100

Answer 4

致OP：

在您的答案中，过滤必须是每个字段的

OR

分别针对

LIKE ?

。

所以这条线应该是

String sql = "SELECT * FROM " + TABLE_NAME + " WHERE ( " + ColumnA + " LIKE ?) OR (" + ColumnB + " LIKE ?) ORDER BY " + ColumnA + " LIMIT 100";