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JDBC driver incorrectly converts TINYINT fields to String instead of an integer type. #4026

monetdb-team opened this issue Nov 30, 2020 · 0 comments


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@monetdb-team monetdb-team commented Nov 30, 2020

Date: 2016-06-27 11:24:33 +0200
From: Erik Berglund <<erik.berglund>>
To: clients devs <>
Version: 11.23.3 (Jun2016)

Last updated: 2016-07-22 09:56:10 +0200

Comment 22211

Date: 2016-06-27 11:24:33 +0200
From: Erik Berglund <<erik.berglund>>

User-Agent: Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2704.103 Safari/537.36
Build Identifier:

When requesting the result of a query as an object, the JDBC driver returns TINYINT fields as String objects instead of, for example Short or Integer objects.

Reproducible: Always

Steps to Reproduce:

Java code to replicate:
Connection c = ...
PreparedStatement ps = c.prepareStatement("create table foo (bar tinyint)");
ps = c.prepareStatement("insert into foo (bar) values(99)");
ps = c.prepareStatement("select bar from foo");
ResultSet rs = ps.executeQuery();
//causes exception:
Short value = (Short) rs.getObject(1);
ps = c.prepareStatement("drop table foo ");

Actual Results:

Instead of returning an object of an integer class (Integer, Short, or Long) the driver returns a String object with the result encoded as text.

Expected Results:

The driver should return a type that as closely matches the type of the database column as possible.

This happens every time on 32 bit windows 7, but only intermittently on 64-bit Ubuntu 16.04 with the MonetDB version included in that distribution's repository (Jun2016).

Comment 22219

Date: 2016-06-30 16:03:33 +0200
From: MonetDB Mercurial Repository <>

Changeset ac8dddcdeaf5 made by Martin van Dinther in the MonetDB repo, refers to this bug.

For complete details, see http//devmonetdborg/hg/MonetDB?cmd=changeset;node=ac8dddcdeaf5

Changeset description:

Added missing case for type == Short.class which is needed for SQL smallint and tinyint columns.
Added Java test program Test_PSgetObject.
This fixes bug #4026.
Also improved handling of getObject(int colnr, Map<String,Class<?>> map) input arguments.
When colnr is invalid it now throws a proper SQLException.
When map is null it falls back to internal default mapping as defined in getClassForType().

Comment 22233

Date: 2016-07-05 16:38:06 +0200
From: @sjoerdmullender

I understand the commit fixed the problem.

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