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PODelphi, TBlobField and UTF8
 

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    <p>Here's my architecture :</p> <p>Datasnap Client &lt;=> Datasnap Server &lt;=> Oracle 11 XE</p> <p>I'm using a remote provider with TDSProviderConnection from the client side to access my dataset.</p> <p>Basically, I'm using a TIdHTTP component to query a website and store the result in an Oracle CLOB column.</p> <p>When saving result to a file, text, accented and other exotic characters are displayed correctly. same text inserted into a clob using sqldeveloper is displayed correctly as well.</p> <p>But when I'm doing this thru datasnap architecture, wrong characters shows up (like black diamonds or "upperscore" (underscore on top)</p> <p>My DB Charset is AL32UTF8, which is the default charset on Oracle 11 XE.</p> <p>To better understand where the problem is, I rewrote part of my client to access my database directly. And I can say the problem is not in the communication between datasnap client and server.</p> <p>Now my architecture is :</p> <p>Client &lt;=> Database</p> <p>And I access Oracle XE the following way :</p> <p>TClientDataSet &lt;=> TDataSetProvider &lt;=> TSQLDataSet &lt;=> TSQLConnection</p> <p>Response from TIdHTTP, which is a <code>TMemoryStream</code>, is stored in the TClientDataset with :</p> <pre><code> With ClientDataSet do begin Edit; (Fieldbyname('MYCLOBFIELD') as TBlobField).LoadFromStream(MS); ApplyUpdates(-1); end; </code></pre> <p>EDIT : 21st of may</p> <p>I did test around TBlobField and this component seems to be part of my problem. Let me explain :</p> <p>I took a random string containing characters from an extended charset like this : <strong>'ÐÒÙÜßąĀûÆ'</strong></p> <p>And with my ClientDataSet, changed the assignment to this :</p> <pre><code> FieldByname('MYCLOB').value := 'ÐÒÙÜßąĀûÆ'; // &lt;-- Inserted correctly into Oracle. </code></pre> <p>Putting this string in a file 'test.txt' and trying to display a popup with the content does not work :</p> <pre><code> var MyBlobField: TBlobField; begin MyBlobField.LoadFromFile('test.txt'); ShowMessage(MyBlobField.AsString); // &lt;-- does not display correctly </code></pre> <p>But Using a TMemo to display the content works like a charm :</p> <pre><code> var MyMemo: TMemo; begin MyMemo.Lines.LoadFromFile('test.txt'); // &lt;-- Works perfectly !! </code></pre> <p>I tried to set the <code>TBlobField.BlobType</code> property to <code>ftOraClob</code> or <code>ftBlob</code> with no luck.</p> <p>Finally, using a <code>TStringList</code> (what <code>TMemo.Lines</code> is actually) to load my string into Oracle does the trick.</p> <p>I guess either something is wrong with <code>TBlobField.LoadFromFile/LoadFromStream</code> or I'm not using it correctly.</p> <p>TStringList inherits its <code>LoadFromFile/LoadFromStream</code> method from TStrings, which works.</p> <p>Any help will be greatly appreciated. Regards.</p>
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