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<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US">Thanks for the tip, but BLOBs have the same error – from the source code (lib/odbc/c_src/odbcserver.c):
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US">if(sql_type == SQL_LONGVARCHAR || sql_type == SQL_LONGVARBINARY || sql_type == SQL_WLONGVARCHAR)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US"> size = MAXCOLSIZE;<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US">So BLOBs will be chopped off as well
</span><span lang="EN-US" style="font-family:"Segoe UI Emoji",sans-serif;mso-fareast-language:EN-US">☹</span><span lang="EN-US" style="mso-fareast-language:EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US">Best Regards<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US">Leif Einar<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span lang="EN-US">From:</span></b><span lang="EN-US"> Éric Pailleau [mailto:eric.pailleau@wanadoo.fr]
<br>
<b>Sent:</b> mandag 8. mai 2017 12.31<br>
<b>To:</b> Erlang Questions <erlang-questions@erlang.org>; Leif Einar Aune <leif.einar@telemagic.no><br>
<b>Subject:</b> Re: [erlang-questions] ODBC and longtext limitation<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p>Hi,<br>
Did you considered using blob and LONGVARBINARY instead ?<br>
This however imply use of temporary tables on some request at mysql side if I remember well.<o:p></o:p></p>
<p>Regards<o:p></o:p></p>
<p>"Envoyé depuis mon mobile " Eric<o:p></o:p></p>
<p class="MsoNormal" style="margin-bottom:12.0pt"><br>
<br>
---- Leif Einar Aune a écrit ----<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US">Hi list,</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US">We are using OTP18.3 on Centos towards a MySQL database using ODBC. When switching a column to LONGTEXT, ODBC type SQL_LONGVARCHAR, we noticed that the values
were chopped off when reading from Erlang.</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US">Reading odbcserver.h and odbcserver.c in the erlang distribution this was no surprise, as the ‘size’ variable is set to MAXCOLSIZE (=8001).</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US">Increasing this define and recompiling the odbcserver fixed the limitation. Has anyone else experienced this limitation, and perhaps come up with a better solution?
The solution feels wrong, since the maximum value of a LONGTEXT is rather big, and you do not want to malloc 4GB of memory for each LONGTEXT column.</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US">Best Regards</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US">Leif Einar Aune</span><span lang="EN-US" style="font-size:8.0pt">
</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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