1.問題說明

方法是要查詢坐標所在的區域：

// 前臺獲取的經緯度坐標String coordinates = longitude + "," + latitude;Map<String, Object> parameter = new HashMap<>(2);parameter.put("coordinates", coordinates);// 調用 mapper 內的方法List<Map<String, Object>> list = commonMapper.getDivisionInfoByCoordinates(parameter);

下面是 Mapper 文件內的 SQL：

<!--判斷坐標地址所在的區劃--><select id="getDivisionInfoByCoordinates" resultType="map" parameterType="map">SELECTid,ext_path AS "divisionInfo"FROMdata_administrative_divisions_geoWHEREpoint( #{coordinates} ) <![CDATA[<@]]> polygon( PATH ( polygon ) )ORDER BYdeep DESC</select>

查詢報錯：

Consume Time：2 ms 2022-02-21 16:20:35 Execute SQL： SELECT id, ext_path AS "divisionInfo" FROM data_administrative_divisions_geo WHERE point( '114.612966,34.74828' ) <@ polygon( PATH ( polygon ) ) ORDER BY deep DESCError querying database. Cause: java.sql.SQLSyntaxErrorException: [Pivotal][Greenplum JDBC Driver][Greenplum]function point(unknown) is not unique. Could not choose a best candidate function. You might need to add explicit type casts.

將 p6spy 打印出來的 SQL 粘貼到 Navicat 內執行，可以獲取結果 😢

2.問題解決

方法 1?? 把point( #{coordinates} )修改為point( ${coordinates} )也就是 # --> $ 也就是函數的入參變為數值,數值：

<!--判斷坐標地址所在的區劃--><select id="getDivisionInfoByCoordinates" resultType="map" parameterType="map">SELECTid,ext_path AS "divisionInfo"FROMdata_administrative_divisions_geoWHEREpoint( ${coordinates} ) <![CDATA[<@]]> polygon( PATH ( polygon ) )ORDER BYdeep DESC</select>

方法 2?? 把point( #{coordinates} )修改為CAST ( #{coordinates} AS POINT )，這種方法跟提示信息 You might need to add explicit type casts. 您可能需要添加顯式類型轉換。是一致的：

<!--判斷坐標地址所在的區劃--><select id="getDivisionInfoByCoordinates" resultType="map" parameterType="map">SELECTid,ext_path AS "divisionInfo"FROMdata_administrative_divisions_geoWHERECAST ( #{coordinates} AS POINT ) <![CDATA[<@]]> polygon( PATH ( polygon ) )ORDER BYdeep DESC</select>

總結

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