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1934896 - When passing large amounts of text data through jConnect JDBC Driver with DYNAMIC_PREPARE=true, exception is thrown: java.sql.SQLException: Type '6c' not implemented


  • A JDBC application using jConnect JDBC driver to connect to SAP Sybase ASE (Adaptive Server Enterprise), passes text data to the database via dynamic prepared SQL.
  • DYNAMIC_PREPARE property is set to "true", which is the default for jConnect 7.0.
  • The field on ASE is defined as TEXT.
  • The data for this field can be sent at various lengths.
  • When length is 16K or less, no errors occur and the SQL completed successfully.
  • When length is between 16K and 32K this error occurs: java.sql.SQLException: The token datastream length was not correct. This is an internal protocol error.
  • When length is over 32K this error occurs: java.sql.SQLException: Type '6c' not implemented.
    • The type value such as '6c' is arbitrary and is based on what ASE reads from the TDS stream.
  • The error messages originate from the ASE side.




  • jConnect JDBC driver for ASE version 7.0, included in ASE SDK (Software Developer's Kit) 15.5 releases.
  • Sample version string from jConnect 7.0 (15.5 ESD#11): 7.00(Build 26548)/P/EBF19559/JDK16/Thu Sep 29 9:30:50 2011.
  • SAP Sybase ASE 15.7 (GA and higher).
  • Use of java 6 or higher.
  • Any platform (Windows, Linux, Solaris, AIX, HP).


SAP Adaptive Server Enterprise 15.7 ; SAP Adaptive Server Enterprise 16.0


jConn, longchar, blob, blob_varchar , KBA , BC-SYB-SDK , SDK , Problem

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