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Editorial Team
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Asked: 2026-06-03T02:50:37+00:00

I am trying to add a column to a database table and PreparedStatement ps

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I am trying to add a column to a database table and 

PreparedStatement  ps = con.prepareStatement(query);  
ps.execute();
ps.close();

query is something like (valid SQL)

ALTER TABLE mytable ADD COLUMN mycolumn datatypeinfo

Anyway, it executes fine and the column is created. But the execute statement returns false. I tried with executeUpdate and that returns 0 rows.

Note that this whole thing is within a transaction with con.setAutoCommit set to false. So I am not sure if that is the problem. The issue is that I have to create the column before I can go ahead with other update queries. So it has to run in a transaction.

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1 Answer

  1. Editorial Team

    The return value of execute() does not indicate whether it was successful, but if the query that was run returned a result.

    As the ALTER TABLE does not return a result, the execute() rightfully returns false

    Quote from the Javadocs:

    Returns: true if the first result is a ResultSet object; false if the first result is an update count or there is no result

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