Ebean RawSql 未解析查询

Question

因此，由于 Ebean 不支持 Aggregate 功能以及其他许多功能，因此我尝试使用 RawSql 让我的复杂查询工作。此外，事实证明我需要使用.unparsed(sql)，因为我的有效查询字符串不适用于.parse(sql)。

这是我的代码：

final String sql = "SELECT DISTINCT d.user_id, CAST(d.date as DATE) AS date," +
            " MAX(d.speed_KPH) OVER (PARTITION BY CAST(d.date as DATE)) AS maxSpeed," +
            " AVG(d.speed_KPH) OVER (PARTITION BY CAST(d.date as DATE)) AS avgSpeed" +
            " FROM Driver as d" +
            " WHERE d.date BETWEEN '" + sdf.format(from) + "' and '" + sdf.format(to) + "'" +
            " ORDER BY date DESC";

final RawSql rawSql = RawSqlBuilder.unparsed(sql)
        .columnMapping("user_id", "user.userId")
        .columnMapping("date", "message.date")
        .columnMapping("maxSpeed", "maxSpeed")
        .columnMapping("avgSpeed", "avgSpeed")
        .create();

final List<MessageAggregate> theList = Ebean.find(MessageAggregate.class).setRawSql(rawSql)
        .findList();

Ebean 生成以下（有效）查询：

SELECT DISTINCT d.user_id, CAST(d.date as DATE) AS date, 
        MAX(d.speed_KPH) OVER (PARTITION BY CAST(d.date as DATE)) AS maxSpeed,
        AVG(d.speed_KPH) OVER (PARTITION BY CAST(d.date as DATE)) AS avgSpeed
    FROM Driver AS d
    WHERE d.date 
    BETWEEN '2014-01-02 09:00:00' and '2014-03-12 17:00:00' 
    ORDER BY date DESC

在 MSSQL Studio 中运行时会产生：

    user_id date    maxSpeed    avgSpeed
4   2014-02-20  74.1    1.1935294117647
311 2014-02-20  74.1    1.1935294117647
314 2014-02-20  74.1    1.1935294117647
347 2014-02-20  74.1    1.1935294117647
... etc ...

在 Ebean 中运行时（通过 PlayFramework 2.2.2）：

Caused by: javax.persistence.PersistenceException: Query threw SQLException:Invalid column index 0.
Bind values:[]

我尝试过使用和不使用.columnMapping，发现这个小（3 岁以上的金块here）表明您可以使用.columnMapping()，但它们必须是正确的、线性的顺序，就我而言，它们是。

Answer 1

目前没有办法做到这一点。对聚合函数的支持不存在。所以我最终简化了我的查询，并通过代码（Java）过滤了其余的结果。如果您处于类似情况，请不要浪费您的时间（和您的头发！）试图让这些东西发挥作用，因为它不会。