[英]Java get ResultSet from SQL Array is Failing
Im trying to retrieve email addresses from a database but am not having success. 我试图从数据库中检索电子邮件地址,但没有成功。 My Code is as Follows: 我的代码如下:
Main: 主要:
System.out.println(PortfolioData.getEmails(58)); //So Far Returning null
PortfolioData: 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: 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;
}
Here is my log file and errors: 这是我的日志文件和错误:
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 commented that my error log wasn't showing the actual exception. 卡亚曼评论说我的错误日志没有显示实际的异常。 So I've removed my error logging and catching. 因此,我已经删除了错误记录和捕获功能。 Here is what I'm now getting in the terminal: 这是我现在要进入终端的内容:
[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)
The query itself executes fine inside MySQL Workbench: 查询本身在MySQL Workbench内可以正常执行:
Some of the additional supporting code of DBEasyQuery can be found in the below picture. 下图提供了DBEasyQuery的一些其他支持代码。 I removed it from showing in the post since it makes the post really long: http://i.stack.imgur.com/WZDkL.png 我将其从帖子中显示中删除了,因为它使帖子变得很长: http : //i.stack.imgur.com/WZDkL.png
I don't think there is an error in it since it works fine for everything else I can throw at it: 我认为其中没有错误,因为它可以很好地解决所有其他问题:
The problem is in the JDBC driver. 问题出在JDBC驱动程序中。 Not all drivers support all features, and the driver you're using doesn't support this. 并非所有驱动程序都支持所有功能,并且您使用的驱动程序不支持此功能。
Solutions: find a different driver that supports the feature (if one exists). 解决方案:找到支持该功能的其他驱动程序(如果存在)。
EDIT: It doesn't look too good on the driver side. 编辑:在驱动程序方面看起来不太好。 You might have to perform your queries differently. 您可能必须以不同的方式执行查询。
EDIT #2: It seems that MySQL doesn't support the ARRAY type so you will need to do things in the old fashioned way. 编辑#2:看来MySQL不支持ARRAY类型,因此您将需要以老式的方式进行操作。
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