從java中使用java獲取mysql中的類型幾何列的數據

我有一個mysql數據庫表geometry類型的列GEOMETRY。我以前用這個語句成功從表中僅查詢GEOMETRY柱：從java中使用java獲取mysql中的類型幾何列的數據

String sql="SELECT AsText(GEOMETRY) from" +tableName+";";

現在，我想查詢這個表像這樣在它裏面的所有領域：

String sql="Select * from "+tableName+";"; 
Statement st=null; 
    ResultSet rs=null; 
    try { 
     st=(Statement) conn.createStatement(); 
     rs=st.executeQuery(sql); 
     while(rs.next()) 
     { 
      //...getting other fields 
      String wkt=rs.getString("AsText(GEOMETRY)");//error 
      //add all fields to an ArrayList 
     } 
    } catch (SQLException e) { 
     // TODO Auto-generated catch block 
     e.printStackTrace(); 
    }

我在這裏得到這個錯誤：

Select * from ZMAPERP_equi_GIS_DB; 
java.sql.SQLException: Column 'AsText(GEOMETRY)' not found. 
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1084) 
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:987) 
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:973) 
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:918) 
at com.mysql.jdbc.ResultSetImpl.findColumn(ResultSetImpl.java:1162) 
at com.mysql.jdbc.ResultSetImpl.getString(ResultSetImpl.java:5728) 
at com.hastha.marerp.googlemaps.DBUtils.getAllFeatures(DBUtils.java:340) 
at com.hastha.marerp.googlemaps.LayerLoader.doGet(LayerLoader.java:48) 
at javax.servlet.http.HttpServlet.service(HttpServlet.java:620) 
at javax.servlet.http.HttpServlet.service(HttpServlet.java:727) 
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303) 
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) 
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) 
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) 
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) 
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220) 
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122) 
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501) 
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171) 
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) 
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950) 
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116) 
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408) 
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1040) 
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:607) 
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:314) 
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) 
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) 
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) 
at java.lang.Thread.run(Unknown Source)

來源

2014-09-01 vamsiampolu

您的代碼：String wkt=rs.getString("AsText(GEOMETRY)");是錯誤發生的地方，因爲它正在尋找名爲「As文本（幾何）」，但不再查詢..你有SELECT * FROM ...所以這就是等於說SELECT GEOMETRY FROM ..不是AsText（）部分

我會指定字段，以便讓你的這個查詢

SELECT field1, field2, AsText(GEOMETRY) FROM tablename

如果你不想每個人寫出來的，那麼你可以只添加astext到底這樣

SELECT *, AsText(GEOMETRY) FROM tablename

來源

2014-09-01 16:05:32

我用了第二個，它worked.Thanks的答案，將接受只要我可以 – vamsiampolu 2014-09-01 16:13:56

@ user2309862謝謝:)祝你好運與你編程努力！ – 2014-09-01 16:25:30

從java中使用java獲取mysql中的類型幾何列的數據

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