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POReading null values from ResultSet
 

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  1. POReading null values from ResultSet
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    <p>There is the following table that may contain empty values for STA, ETA or ATA:</p> <pre><code>CREATE TABLE `flightschedule` ( `id` smallint(6) NOT NULL AUTO_INCREMENT, `flightNum_arr` varchar(40) DEFAULT NULL, `from_ICAO` varchar(20) DEFAULT NULL, `STA` datetime DEFAULT NULL, `ETA` datetime DEFAULT NULL, `ATA` datetime DEFAULT NULL, `pk_arr` varchar(10) DEFAULT NULL PRIMARY KEY (`id`) ) ENGINE=MyISAM AUTO_INCREMENT=5611 DEFAULT CHARSET=latin1; </code></pre> <p>The query is:</p> <blockquote> <p>SELECT flightNum_arr,STA,ETA,ATA,airlineICAO,aircraftType,pk_arr FROM flightschedule";</p> </blockquote> <p>When I try to read data from this table in my Java code, the following error occurs:</p> <blockquote> <p>java.sql.SQLException: Cannot convert value '0000-00-00 00:00:00' from column 2 to TIMESTAMP.</p> </blockquote> <p>It occurs at line <code>record[i] = rs.getString(i + 1);</code></p> <p>I introduced the following checking, but it does not seem to be working:</p> <pre><code>if(record[i] == null) { record[i]= ""; } </code></pre> <p>The code:</p> <pre><code>public void setQuery(String query) { cache = new Vector(); try { // Execute the query and store the result set and its metadata Connection con = getConnection(); Statement statement = con.createStatement(); ResultSet rs = statement.executeQuery(query); ResultSetMetaData meta = rs.getMetaData(); colCount = meta.getColumnCount(); // Rebuild the headers array with the new column names headers = new String[colCount]; for (int h = 1; h &lt;= colCount; h++) { headers[h - 1] = meta.getColumnName(h); } while (rs.next()) { String[] record = new String[colCount]; for (int i = 0; i &lt; colCount; i++) { record[i] = rs.getString(i + 1); if(record[i] == null) { record[i]= ""; } } cache.addElement(record); } fireTableChanged(null); rs.close(); if (con.getAutoCommit() != false) { con.close(); } } catch (Exception e) { cache = new Vector(); // blank it out and keep going. e.printStackTrace(); } } </code></pre>
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    1. This table or related slice is empty.
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    1. USKlausos Klausos
    1. USKlausos Klausos
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    1. This table or related slice is empty.
    1. This table or related slice is empty.
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    1. COPlease provide the entire stack trace. At what line of code in the above does the exception occur? Does your query contain a `WHERE` clause that uses one of the timestamp columns?
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      1. POReading null values from ResultSet
      1. USJohn B
    2. CO@John B: Please see the updated post.
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      1. USKlausos Klausos
 

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