centos open dll so undefined symbol mysql_fetch_field

The "undefined symbol: mysql_fetch_field" error typically occurs when there is a mismatch between the version of the MySQL library being used and the version expected by the application.

To resolve this issue, you can try the following steps:

1. Make sure you have the MySQL development libraries installed on your CentOS system. You can install them using the package manager:

   sudo yum install mysql-devel
   

2. Check the version of the MySQL library being used by your application. You can use the ldd command to list the dynamic dependencies of the binary:

   ldd your_application_binary
   

   Look for the line that shows the MySQL library being used.

3. Verify that the MySQL library version matches the version of the library installed on your system. You can check the version of the installed MySQL library using the mysql_config command:

   mysql_config --version
   

   If the versions do not match, you may need to recompile your application against the correct version of the MySQL library.

4. If you have multiple versions of the MySQL library installed on your system, you can try setting the LD_LIBRARY_PATH environment variable to point to the correct version of the library:

   export LD_LIBRARY_PATH=/path/to/mysql/library
   

   Replace "/path/to/mysql/library" with the actual path to the directory containing the MySQL library.

5. Restart your application and check if the "undefined symbol: mysql_fetch_field" error is resolved.

If the issue persists, you may need to provide more information about your application, CentOS version, and MySQL version to get further assistance