Bug #70726 Wrong ResultSet.getType() values for internally generated ResultSets
Submitted: 25 Oct 2013 10:06 Modified: 28 Feb 2022 9:40
Reporter: Filipe Silva Email Updates:
Status: Can't repeat Impact on me:
None 
Category:Connector / J Severity:S3 (Non-critical)
Version:5.1.26 OS:Any
Assigned to: Filipe Silva CPU Architecture:Any

[25 Oct 2013 10:06] Filipe Silva 
Description:
The ResultSet retrieved from Statement.getGeneratedKeys() has and invalid type, equals to 0.

The same happens with all ResultSets obtained from MetaData objects, unless useInformationSchema=true is used, in which case their type is TYPE_FORWARD_ONLY.

How to repeat:
Just obtain ResultSets from Statement.getGeneratedKeys() or any RS/DB MetaData object that returns a ResultSet and call .getType().

Returned value should be 1003 instead of 0.

Suggested fix:
Set default ResultSet type value to ResultSet.TYPE_FORWARD_ONLY.
[25 Oct 2013 10:07] Filipe Silva 
Verified by the reporter.
[2 Jan 2016 22:32] Ramin Orujov 
Test case

Attachment: Bug70726.java (text/x-java), 1.58 KiB.
[2 Jan 2016 22:34] Ramin Orujov 
Fixed this bug 

create table test.bug70726(
    id int primary key auto_increment,
    str varchar(20)
);

insert into test.bug70726 values(null, 'a');
insert into test.bug70726 values(null, 'b');
insert into test.bug70726 values(null, 'c');

select * from test.bug70726;

# output before fix, result set type is 0 
raminorujov@ro--ubuntu:~/Downloads$ javac -cp .:mysql-connector-java-5.1.38-SNAPSHOT-bin.jar Bug70726.java 
raminorujov@ro--ubuntu:~/Downloads$ java -cp .:mysql-connector-java-5.1.38-SNAPSHOT-bin.jar Bug70726
insert count = 1
Statement.getGeneratedKeys() result set type = 0
id = 8
DatabaseMetaData.getCatalogs() result set type = 0
information_schema
mysql
performance_schema
test
raminorujov@ro--ubuntu:~/Downloads$ 

# output after fix, result set type is 1003 TYPE_FORWARD_ONLY
raminorujov@ro--ubuntu:~/repo/ro-mysql-connector-j/mysql-connector-j$ cp build/mysql-connector-java-5.1.38-SNAPSHOT/mysql-connector-java-5.1.38-SNAPSHOT-bin.jar ~/Downloads/
raminorujov@ro--ubuntu:~/repo/ro-mysql-connector-j/mysql-connector-j$ cd ~/Downloads/
raminorujov@ro--ubuntu:~/Downloads$ java -cp .:mysql-connector-java-5.1.38-SNAPSHOT-bin.jar Bug70726
insert count = 1
Statement.getGeneratedKeys() result set type = 1003
id = 9
DatabaseMetaData.getCatalogs() result set type = 1003
information_schema
mysql
performance_schema
test
raminorujov@ro--ubuntu:~/Downloads$
[2 Jan 2016 22:37] Ramin Orujov 
Here is my fixed version.
https://github.com/raminorujov/mysql-connector-j/commit/32c3844d997c0bc05e2c2c09866efe77c9...
[28 Feb 2022 9:40] Alexander Soklakov 
Posted by developer:
 
This bug is not reproducible with the latest Connector/J 8.0.

Connector/J 5.1 series came to EOL on Feb 9th, 2021, see https://www.mysql.com/support/eol-notice.html, so this bug will not be fixed there.