在 oracle 语法模式下，在内存 hsqldb 中的 oracle 查询失败

Question

以下查询在 hsqldb 2.3.2 中失败，sql.syntax_ora=true。
在 Oracle 11 中运行良好。
它是一个休眠的命名查询，在 TestNG 测试中使用到内存中的 hsqldb 而不是真正的 Oracle。 错误信息是：java.sql.SQLSyntaxErrorException: unexpected token: ORDER required: ) : line: 16, 指的是 row_number() over (order by lastUpdateTime desc) 区域：

select  
        id         as id1_9_0_,  
        version    as version2_9_0_,  
        lastUpdateTime as lastUpda7_9_0_,  
        eventType    as eventTyp3_9_0_,  
        clientJid    as clientJi4_9_0_,  
        topicName as topicNam5_9_0_,  
        attributes as attribut6_9_0_  
    from (select logEvents.id as id,  
                 logEvents.version as version,  
                 logEvents.lastUpdateTime as lastUpdateTime,  
                 logEvents.eventType as eventType,  
                 logEvents.clientJid as clientJid,  
                 logEvents.topicName as topicName,  
                 logEvents.attributes as attributes,  
                 row_number() over (order by lastUpdateTime desc) rn    from xyz_logEvent logEvents)  
    where rn between 1 and 4 order by rn;  

Answer 1

HSQLDB 并不支持所有可能的 SQL 语法。不支持row_number() over (order by ...)，而支持row_number() over ()。

替代方案可能如下所示：

(select logEvents.id as id,
logEvents.version as version,
logEvents.lastUpdateTime as lastUpdateTime,
logEvents.eventType as eventType,
logEvents.clientJid as clientJid,
logEvents.topicName as topicName,
logEvents.attributes as attributes,
row_number() over () rn from xyz_logEvent logEvents order by lastUpdateTime limit 4)