| Bug #35170 | isAfterLast() not working in streaming ResultSet | ||
|---|---|---|---|
| Submitted: | 9 Mar 2008 9:29 | Modified: | 4 Jul 2008 16:08 |
| Reporter: | Janbo Petkov | Email Updates: | |
| Status: | Closed | Impact on me: | |
| Category: | Connector / J | Severity: | S1 (Critical) |
| Version: | 5.1.6 | OS: | Windows (XP) |
| Assigned to: | CPU Architecture: | Any | |
| Tags: | isAfterLast, setFetchSize | ||
[10 Mar 2008 10:20]
Tonci Grgin
Test case on latest c/J 5.1 sources
Attachment: TestBug35170.java (text/java), 1.54 KiB.
[10 Mar 2008 10:29]
Tonci Grgin
Hi Janbo and thanks for your report. I must say I do not understand it. Can you please elaborate why "false" is wrong? I would expect "false" there but for this.rs.isLast() I would expect error (see comments in my test case) using streaming RS. I'm using driver built from latest sources (5.1.7) on Win32. Test case output (uncomment isLast() line to see the error): .Loading JDBC driver 'com.mysql.jdbc.Driver' Done. Done. Connected to 5.0.58-pb1083-log java.vm.version : 1.5.0_12-b04 java.vm.vendor : Sun Microsystems Inc. java.runtime.version : 1.5.0_12-b04 os.name : Windows XP os.version : null sun.management.compiler : HotSpot Client Compiler falseE << Output from "this.rs.isAfterLast()", removed from test case attached Time: 0,234 There was 1 error: << Error from "this.rs.isLast()", remarked in test case attached 1) testBug35170(testsuite.simple.TestBug35170)com.mysql.jdbc.RowDataDynamic$OperationNotSupportedException: Operation not supported for streaming result sets at com.mysql.jdbc.RowDataDynamic.notSupported(RowDataDynamic.java:454) at com.mysql.jdbc.RowDataDynamic.isLast(RowDataDynamic.java:365) at com.mysql.jdbc.ResultSetImpl.isLast(ResultSetImpl.java:6850) at testsuite.simple.TestBug35170.testBug35170(TestBug35170.java:39) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at testsuite.simple.TestBug35170.main(TestBug35170.java:51) FAILURES!!! Tests run: 1, Failures: 0, Errors: 1
[13 Mar 2008 13:17]
Janbo Petkov
sorry. wrong example. right one:
Statement stt = con.createStatement(ResultSet.TYPE_FORWARD_ONLY, ResultSet.CONCUR_READ_ONLY);
stt.setFetchSize(Integer.MIN_VALUE);
ResultSet rs = stt.executeQuery("select * from mysql.user");
rs.next();
while(!rs.isAfterLast()){
System.out.println(rs.getString(1));
rs.next();
}
fails with:
java.lang.NullPointerException
at com.mysql.jdbc.ResultSetImpl.getStringInternal(ResultSetImpl.java:5528)
at com.mysql.jdbc.ResultSetImpl.getString(ResultSetImpl.java:5434)
[13 Mar 2008 18:46]
Bugs System
A patch for this bug has been committed. After review, it may be pushed to the relevant source trees for release in the next version. You can access the patch from: http://lists.mysql.com/commits/43953
[4 Jul 2008 16:08]
Tony Bedford
An entry has been added to the 5.1.7 changelog: Incorrect result is returned from isAfterLast() in streaming ResultSet when using setFetchSize(Integer.MIN_VALUE).
[30 Jul 2008 14:53]
Bugs System
A patch for this bug has been committed. After review, it may be pushed to the relevant source trees for release in the next version. You can access the patch from: http://lists.mysql.com/commits/50724
Description: Connector/J wrong result from isAfterLast() in streaming ResultSet when using setFetchSize(Integer.MIN_VALUE) possibly connected to bugs #18148, #8778, #7435 tested with server.5.0.27 connector/j: 3.0.11 - ok 3.1.14 - ok 5.0.8 - ok 5.1.5 - fail 5.1.6 - fail How to repeat: Connection con; //... initiate con Statement stt = con.createStatement(ResultSet.TYPE_FORWARD_ONLY, ResultSet.CONCUR_READ_ONLY); stt.setFetchSize(Integer.MIN_VALUE); ResultSet set = stt.executeQuery("select * from TEST"); while(set.next()); boolean eof = set.isAfterLast(); wrong - eof == false