如何在Mondrian OLAP中使用DRILLTHROUGH?

时间:2013-05-24 21:03:13

标签: mdx olap mondrian

如何在Mondrian中使用DRILLTHROUGH查询?例如,此MDX查询

DRILLTHROUGH
SELECT
  measures.MEMBERS ON 0
FROM
  events

生成异常:

java.lang.ClassCastException: mondrian.olap.DrillThrough cannot be cast to mondrian.olap.Query
    at mondrian.olap4j.MondrianOlap4jStatement$1.execute(MondrianOlap4jStatement.java:362)
    at mondrian.olap4j.MondrianOlap4jStatement$1.execute(MondrianOlap4jStatement.java:360)
    at mondrian.server.Locus.execute(Locus.java:87)
    at mondrian.server.Locus.execute(Locus.java:72)
    at mondrian.olap4j.MondrianOlap4jStatement.parseQuery(MondrianOlap4jStatement.java:356)
    at mondrian.olap4j.MondrianOlap4jStatement.executeOlapQuery(MondrianOlap4jStatement.java:346)

在代码中,我将MDX字符串传递给语句,如下所示:

OlapConnection connection = DriverManager.getConnection(connection_string).unwrap(OlapConnection.class);
connection.createStatement.executeOlapQuery(mdx);

我还尝试在drillThrough上调用Cell,但这导致异常org.postgresql.util.PSQLException: FATAL: sorry, too many clients already。也许我没有正确管理连接?请参阅我的其他问题:Mondrian OLAP connection management

1 个答案:

答案 0 :(得分:2)

钻取操作将返回ResultSet(实现常规JDBC API),因此您需要使用它:

olapConnection.createStatement().executeQuery(String mdx)