ORMLite - 加入 where 子句中的括号 [英] ORMLite - Parenthesis in join where clauses

问题描述

我想使用 QueryBuilder.join 和 QueryBuilder.joinor 连接三个表，但我想在 where 子句中添加括号，如下所示:

I would like to join three tables using QueryBuilder.join and QueryBuilder.joinor but I want parenthesis in the where clause something like this:

WHERE first_table_where AND (second_table_where OR third_table_where)

但这似乎是不可能的.

也许我错过了一些东西.任何帮助将不胜感激.

Perhaps I am missing something. Any help would be appreciated.

推荐答案

我猜这是一个 您一直在寻找的文档的一部分...

如果您想线性地进行复杂查询，您甚至可以使用 Reverse Polish Notation(所有事物).有一个 Where.or(int) 和 Where.and(int) 方法，它们对前面指定的子句进行操作.

If you want to do complex queries linearly, you can even use Reverse Polish Notation (of all things). There is a Where.or(int) and Where.and(int) methods which do the operation on the previous number of specified clauses.

where.eq(Account.NAME_FIELD_NAME, "foo");
where.eq(Account.PASSWORD_FIELD_NAME, "_secret");
// this does an AND between the previous 2 clauses
// it also puts a clause back on the stack
where.and(2);
where.eq(Account.NAME_FIELD_NAME, "bar"),
where.eq(Account.PASSWORD_FIELD_NAME, "qwerty")));
// this does an AND between the previous 2 clauses
// it also puts a clause back on the stack
where.and(2);
// this does an OR between the previous 2 AND clauses
where.or(2);

这篇关于ORMLite - 加入 where 子句中的括号的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！