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New CONNECT table type JDBC
In response to a feature request (see MDEV-9765) I have developed a
first version of a JDBC table type for CONNECT.
Directly calling JDBC drivers from C++ seems difficult. JDBC drivers are
designed to be called from Java applications and the issue is that the
JDBC API can have parameters or return Java classes or objects. In
addition they often throw Java Exceptions.
From C++, Java code can be called using the JNI interface but handling
the above problems is combersome. This is why, at least in a first
version, I have written a Java class (JdbcInterface) that calls JDBC
functions with proper objects and takes care of Exceptions. CONNECT uses
JNI to call this intermediate class.
How can this be distributed?
The Java JdbcInterface.class must be accessible in the CLASSPATH that is
defined when installing JDBC drivers. When compiling MariaDB, this means
also that the source file JdbcInterface.java must be compiled along with
the rest of the CONNECT source files.
I have no idea on how this can be achieved.