本文介绍了解决使用Borland Developer Studio 2006通过dbExpress或BDP连接Sybase ASE 15时遇到的“ConnectionOpenFailed”及“Object reference not set to an instance of an object.”错误的方法。主要涉及配置Sybase OpenClient DLL文件。
Abstract: Error when connecting to Sybase with dbExpress/BDP
Product: Borland Developer Studio 2006
Problem Description
I am trying to connect to Sybase ASE 15 using the dbExpress and the supplied Sybase Open Client. When I try to connect, I receive the error "Connection Open Failed". Similarly when I try via BDP, I receive the error message, "Object reference not set to an instance of an object."
Problem Resolution
Most likely the Sybase Open Client dll's required by dbExpress cannot be found. dbExpress's Sybase driver is dependent on the files, libct.dll and libcs.dll. The latest Sybase client has changed the names of its client dll's and so those files will not be present by default. There is a batch file supplied with the Sybase client that can rename the files for those applications that need the older file names, however. Run
<sybase client install>/OCS-15_0/scripts/copylibs.bat create
Then ensure that the directory containing libct.dll is present on the path. By default, this is
<sybase client install>/OCS-15_0/dll
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