QueryDSL怎么写"WHERE ? BETWEEN col1 AND col2"

Question

如何使用 QueryDSL 编写类似于 WHERE ? BETWEEN col1 AND col2 的 WHERE 子句？我知道我可以改写如下，

...
.where(mytable.col1.loe(constant), mytable.col2.goe(constant))
...

但是使用 BETWEEN 使查询更具可读性。

我使用 QueryDSL 3.2.3。

更新：

我最终得到了这样的结果 (A testcase which runnable via mvn test):

final int constant = 10;
final QMyTable m = QMyTable.myTable;
final SimpleExpression<Boolean> operation = Expressions.operation(Boolean.class, Ops.BETWEEN,
        Expressions.constant(constant), m.col1, m.col2);

// This yields:
// SELECT ID, COL1, COL2 FROM MYTABLE WHERE ((? BETWEEN COL1 AND COL2) = ?)
// bind => [10, true]
final MyTable actual = new JPAQuery(em).from(m).where(operation.eq(true)).uniqueResult(m);

它无论如何都有效，但 = ? 部分是多余的。我想要更简单的东西，比如：

SELECT ID, COL1, COL2 FROM MYTABLE WHERE (? BETWEEN COL1 AND COL2)

我不知道怎么写。有什么方法可以通过 QueryDSL 构造这个查询吗？

Answer 1

我刚找到这个：

final int constant = 10;
final QMyTable m = QMyTable.myTable;
final BooleanExpression operation = Expressions.booleanOperation(Ops.BETWEEN,
        Expressions.constant(constant), m.col1, m.col2);

// This yields:
// SELECT ID, COL1, COL2 FROM MYTABLE WHERE (? BETWEEN COL1 AND COL2)
// bind => [10]
final MyTable actual = new JPAQuery(em).from(m).where(operation).uniqueResult(m);

这构建了一个我正在寻找的。

测试用例：https://github.com/lbtc-xxx/querydsl-sandbox/blob/master/src/test/java/sandbox/QueryDslBetweenTest.java

QueryDSL怎么写"WHERE ? BETWEEN col1 AND col2"

QueryDSL how to write "WHERE ? BETWEEN col1 AND col2"

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