1
我試圖從數據庫中檢索電子郵件地址，但沒有成功。我的代碼如下：從SQL陣列Java獲取ResultSet失敗
主營：
System.out.println(PortfolioData.getEmails(58)); //So Far Returning null
PortfolioData：
public static String[] getEmails(int i){
DebugMessage.M("Retrieving Email Records for Person Key Number: " + i);
eq.query("SELECT EmailAddresses"
+ " FROM Emails as E"
+ " JOIN People AS P ON E.PersonKey = P.PersonKey"
+ " WHERE P.PersonKey = ?",i);
return (String[])eq.getOnceMultipleRows("EmailAddresses");
}
DBEasyQuery：
public Object getOnceMultipleRows(String label){
if(next()){
try {
Array a = rs.getArray(label);
String[] x = (String[])a.getArray();
smartClose();
return x;
//return rs.getArray(label).getArray();
} catch (SQLException e) {
DebugMessage.E("getOnceMultipleRows() Failed on Query: " + queryExecuted());
DebugMessage.E("getOnceMultiple() Failed on Label: " + label);
notExecuted(e);
}
}
smartClose();
return null;
}
這是我的日誌文件和錯誤：
MESSAGE: Retrieving Person Records for Person Key Number: 58
MESSAGE: SharedConnection dziemba created
SQLQUERY: SELECT AlphaID, FirstName, LastName, Street, City, State, Zip, Country, AcctType, SecID FROM People AS P JOIN Addresses AS A ON P.PersonKey = A.PersonKey LEFT JOIN Role AS R ON P.PersonKey = R.PersonKey WHERE P.PersonKey = 58
MESSAGE: Retrieving Email Records for Person Key Number: 58
SQLQUERY: SELECT EmailAddresses FROM Emails as E JOIN People AS P ON E.PersonKey = P.PersonKey WHERE P.PersonKey = 58
ERROR: getOnceMultipleRows() Failed on Query: SELECT EmailAddresses FROM Emails as E JOIN People AS P ON E.PersonKey = P.PersonKey WHERE P.PersonKey = 58
ERROR: getOnceMultiple() Failed on Label: EmailAddresses
ERROR:
The Following Query Was NOT Executed:
SELECT EmailAddresses FROM Emails as E JOIN People AS P ON E.PersonKey = P.PersonKey WHERE P.PersonKey = 58
Stack Trace:
ERROR: sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
ERROR: sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
ERROR: sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
ERROR: java.lang.reflect.Constructor.newInstance(Unknown Source)
ERROR: java.lang.Class.newInstance(Unknown Source)
ERROR: com.mysql.jdbc.SQLError.notImplemented(SQLError.java:1334)
ERROR: com.mysql.jdbc.ResultSetImpl.getArray(ResultSetImpl.java:1230)
ERROR: com.mysql.jdbc.ResultSetImpl.getArray(ResultSetImpl.java:1247)
ERROR: unl.cse.DBEasyQuery.getOnceMultipleRows(DBEasyQuery.java:218)
ERROR: unl.cse.PortfolioData.getEmails(PortfolioData.java:136)
ERROR: unl.cse.Main.main(Main.java:44)
ERROR:
Kayaman評論說我的錯誤日誌不顯示實際的異常。所以我刪除了我的錯誤日誌和捕獲。以下是我現在在終端獲得：
[Ljava.lang.String;@59966240
java.sql.SQLFeatureNotSupportedException
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at java.lang.Class.newInstance(Unknown Source)
at com.mysql.jdbc.SQLError.notImplemented(SQLError.java:1334)
at com.mysql.jdbc.ResultSetImpl.getArray(ResultSetImpl.java:1230)
at com.mysql.jdbc.ResultSetImpl.getArray(ResultSetImpl.java:1247)
at unl.cse.DBEasyQuery.getOnceMultipleRows(DBEasyQuery.java:220)
at unl.cse.PortfolioData.getEmails(PortfolioData.java:136)
at unl.cse.Main.main(Main.java:44)
Exception in thread "main" java.lang.NullPointerException
at unl.cse.DBEasyQuery.getOnceMultipleRows(DBEasyQuery.java:227)
at unl.cse.PortfolioData.getEmails(PortfolioData.java:136)
at unl.cse.Main.main(Main.java:44)
查詢本身執行MySQL工作臺內的罰款： 
一些DBEasyQuery的額外支持的代碼可以在下面的圖中可以看出。我刪除它從後顯示，因爲它使後很長：http://i.stack.imgur.com/WZDkL.png
我不認爲在這一個錯誤，因爲它工作正常，一切我可以扔了：
你的堆棧跟蹤似乎缺少實際的異常。這使得它在調試中毫無價值。 – Kayaman
我剛編輯我的帖子，看來錯誤是：java.sql.SQLFeatureNotSupportedException –