在sqlite SELECT FROM

Question

我使用此代码搜索A列。如果我想同时搜索A列和B列，我应该做哪些修改？

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

我已经尝试了这个，但它不起作用：

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";

我犯了什么错误？

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

你在寻找UNION而不是OR吗？ http://www.tutorialspoint.com/sqlite/sqlite_unions_clause.htm

Answer 3

进行两次不同的查询。并按union关键字结合结果。

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

这解决了我的问题：

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

我应该使用一个select语句。