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    <p>Please forgive me for savagely plagiarizing my previous answer to <a href="https://stackoverflow.com/questions/3106548/blob-vs-varchar-for-storing-arrays-in-a-mysql-table/3107250#3107250">BLOB vs. VARCHAR for storing arrays in a MySQL table</a>. The other answers over there are also very pertinent.</p> <p>I think Con's approach is probably better than using java serialization since java's builtin serialization will need additional bytes, and non-java applications will have a harder time dealing with the data.</p> <pre><code>public static void storeInDB(ArrayList&lt;Long&gt; longs) throws IOException, SQLException { ByteArrayOutputStream bout = new ByteArrayOutputStream(); DataOutputStream dout = new DataOutputStream(bout); for (long l : longs) { dout.writeLong(l); } dout.close(); byte[] asBytes = bout.toByteArray(); PreparedStatement stmt = null; // however you get this... stmt.setBytes(1, asBytes); stmt.executeUpdate(); stmt.close(); } public static ArrayList&lt;Long&gt; readFromDB() throws IOException, SQLException { ArrayList&lt;Long&gt; longs = new ArrayList&lt;Long&gt;(); ResultSet rs = null; // however you get this... while (rs.next()) { byte[] asBytes = rs.getBytes("myLongs"); ByteArrayInputStream bin = new ByteArrayInputStream(asBytes); DataInputStream din = new DataInputStream(bin); for (int i = 0; i &lt; asBytes.length/8; i++) { longs.add(din.readLong()); } return longs; } } </code></pre> <p>Note: If your lists will sometimes contain more than 31 longs (248 bytes), then you'll need to use BLOB. You cannot use BINARY() or VARBINARY() in MySQL. I realize you're asking about SQLite, but in the spirit of completely plagiarizing my previous answer, I will pretend you're asking about MySQL:</p> <pre><code>mysql&gt; CREATE TABLE t (a VARBINARY(2400)) ; ERROR 1074 (42000): Column length too big for column 'a' (max = 255); use BLOB or TEXT instead </code></pre>
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