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PODoes PostgreSQL supports "SELECT... FOR UPDATE OF..." SQL?
 

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    <p>I am currently using "<strong>PostgreSQL 9.0.4</strong>" database with JDBC driver: "<strong>postgresql-9.0-801.jdbc4.jar</strong>".</p> <p>I have the following JDBC SQL using "<strong>SELECT... FOR UPDATE OF...</strong>" clause which retrieves a column value (long) and updates the value by incrementing in same transaction. <br/>I need to <strong>return the long value</strong>, thus I need to use SELECT Sql.</p> <pre><code>final PreparedStatement preparedStatement = _connection.prepareStatement( "select value from sequence where table_name='JOB' for update of value", ResultSet.TYPE_FORWARD_ONLY, ResultSet.CONCUR_UPDATABLE); long ret; try { final ResultSet resultSet = preparedStatement.executeQuery(); resultSet.next(); ret = resultSet.getLong(1); resultSet.updateLong(1, ret + 1); resultSet.updateRow(); } catch (SQLException ex) { ex.printStackTrace(); } finally { resultSet.close(); preparedStatement.close(); } return ret; </code></pre> <p>All other databases e.g. MySQL, Oracle, MS-SQL, Derby work fine with such SQL - but PostgreSQL always throws following exception.</p> <pre><code> org.postgresql.util.PSQLException: ERROR: relation "value" in FOR UPDATE/SHARE clause not found in FROM clause Position: 68 </code></pre> <p>I do have the table "<strong>sequence</strong>" with the "<strong>value</strong>" column properly created - so this may not be the infamous case-sensitivity issue.</p> <p>Does this mean Postgres does not support <strong>"SELECT ...FOR UPDATE OF.."</strong> SQL syntax? <br/>In that case what will be the best way to achieve the same effect (i.e. select and update with the same transaction)?</p> <p>Many thanks in advance,</p>
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