由于系统前端使用OpenLayers框架，后台数据库使用oracle spatial。大家知道Oracle spatial的SDO_GEOMETRY十分复杂，如果使用期java api ，那就坑爹了，要处理相当多的逻辑和数据类型。今天我有这么一个需求，从前进行多边形查询，我想到了一个好办法，由openlayers构造一个wkt空间串，然后调用SDO_UTIL.FROM_WKTGEOMETRY函数将wkt转为SDO_GEOMETRY,然后再调用SDO_ANYINTERACT进行空间查询，这种方法貌似木有问题，sql如下：select *
  from TBSVRC_RESPUBLISHITEMS t
 where SDO_ANYINTERACT(F_SPATIALEXTENT,SDO_UTIL.from_wktgeometry('POLYGON((80.83422302246095
                                                          20.518481140136714,
                                                          120.4135076904297
                                                          20.518481140136714,
                                                          120.4135076904297
                                                          50.314989929199214,
                                                          80.83422302246095
                                                          50.314989929199214,
                                                          80.83422302246095
                                                          20.518481140136714))') )='TRUE'

将sql在数据库中运行，结果报错：传入的sdo_geometry和数据库表sdo_geometry的srid不同，不能进行空间查询。忽然想起WKT可以表达空间数据信息，但是木有SRID信息。一下傻眼了，那怎么办呢？看看SDO_UTIL包的函数，也都木有将SDO_GEOMETRY设置SRID的函数。于是在网上搜索半天，也无解，搜搜oracle spatial官方文档，也是半天无解。我于是想还是好好分析SDO_GEOMETRY吧。嘿，忽然发现桃花源，SDO_GEOMETRY是一个类型，本身也是一个函数。再仔细看看还有构造参数，喔，问题解决了，sql如下：

select *
  from TBSVRC_RESPUBLISHITEMS t
 where SDO_ANYINTERACT(F_SPATIALEXTENT,sdo_geometry('POLYGON((80.83422302246095
                                                          20.518481140136714,
                                                          120.4135076904297
                                                          20.518481140136714,
                                                          120.4135076904297
                                                          50.314989929199214,
                                                          80.83422302246095
                                                          50.314989929199214,
                                                          80.83422302246095
                                                          20.518481140136714))',8307))='TRUE'

oracle spatial 爱死你了！