<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><meta http-equiv=Content-Type content="text/html; charset=us-ascii"><meta name=Generator content="Microsoft Word 15 (filtered medium)"><style><!--
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</o:shapelayout></xml><![endif]--></head><body lang=EN-GB link="#0563C1" vlink="#954F72"><div class=WordSection1><p class=MsoNormal>We have written our first PyQt (4.6) application. However we have hit a serious road block due to an intermittent database access error.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>The error we see is: <b>“[Microsoft][ODBC Driver Manager] Invalid string or buffer length”.</b><o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>The application has a number of Tableviews, drop down lists, TreeWidget etc. Most of these are populated dynamically by querying the database.<o:p></o:p></p><p class=MsoNormal>Database queries are made through custom API code that uses SqlAlchemy. We do not use QtSql module.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>We see this error only when executing a database query from within PyQt application. It’s very random and therefore not a reproducible error. Has anyone seen this before and got any pointers to resolve such issues. We have tried to google. We see many posts but no answers. <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Are there any good practices we should observe when querying database from within PyQt application.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Thank you in advance. <o:p></o:p></p><p class=MsoNormal>Regards,<o:p></o:p></p><p class=MsoNormal>Pradip<o:p></o:p></p></div></body></html>