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Editorial Team
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Asked: 2026-05-13T11:45:25+00:00

I have a ruby script which I run using the JRuby Interpreter. The script

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I have a ruby script which I run using the JRuby Interpreter.
The script connects to a Sybase database using DBI and Sybase JDBC (jTDS3.jar and jconn3.jar)

My problem is that I have a select query that alters the column names of table.
For example:

SELECT
t.TRANSACTION as 'business_transaction',
t.TRADE_CURRENCY as 'currency',
t.CURRENCY as 'settlement_currency'
...etc...

FROM 
TRADE t
...etc...

My problem is when using the examples directly from the documentation 

sth = dbh.execute(stmt)

printf "Number of rows: %d\n", rows.size
printf "Number of columns: %d\n", sth.column_names.size
sth.column_info.each_with_index do |info, i|
   printf "--- Column %d (%s) ---\n", i, info["name"]
end

or simply

sth = dbh.execute(stmt)

rows = sth.fetch_all
col_names = sth.column_names
sth.finish
DBI::Utils::TableFormatter.ascii(col_names, rows)

Not ALL the names come out as I set them using the ‘as’ clause in the query. Some are the original field names and some are the names I have specified.

For example they will list like:

--- Column 0 (TRANSACTION) ---
--- Column 1 (TRADE_CURRENCY) ---
--- Column 2 (settlement_currency) ---

or 

TRANSACTION
TRADE_CURRENCY
settlement_currency

When testing this in Squirrel SQL Client the columns are correctly named so is this a bug in DBI or the Sybase JDBC drivers? or am I doing something wrong?

Any help would be greatly appreciated

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1 Answer

  1. Editorial Team

    I can confirm it is the Sybase drivers. Using the jTDS (v1.2.5) from
    http://jtds.sourceforge.net/ I can get all the column names correctly defined in my query and can confirm that the original issue is NOT DBI

    If anyone who is following this wondered how I got jtds working with DBI under jRuby please take a look at one of my former questions – it did take some time – and DBI is a little funny when specifying the URL use 

    dbi:Jdbc:jtds:sybase://<host>:<port>/<db>

    Please note the capital J for Jdbc

    I hope this saves someone a lot of time 😉

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