Catch exception in MyBatis 2016-07-04 04:16
I generate mapper interface and xml file in my application. There is no exception in method signature. But when the sql execute failed MyBatis will throw an exception. I found the exception thrown from MyBatis is always PersistenceException. After reading the source code, I seemed to understand.
DefaultSqlSession
public int update(String statement, Object parameter) {
try {
dirty = true;
MappedStatement ms = configuration.getMappedStatement(statement);
return executor.update(ms, wrapCollection(parameter));
} catch (Exception e) {
throw ExceptionFactory.wrapException("Error updating database. Cause: " + e, e);
} finally {
ErrorContext.instance().reset();
}
}
ExceptionFactory
public class ExceptionFactory {
public static RuntimeException wrapException(String message, Exception e) {
return new PersistenceException(ErrorContext.instance().message(message).cause(e).toString(), e);
}
}
If you want catch the exception in MyBatis you can capture the PersistenceException. Do not forget that it wraps the real exception. Capture exception code may like following.
try {
// invoke mapper
} catch (PersistenceException e) {
final Throwable cause = e.getCause();
if (cause instanceof PSQLException) {
// handle the exception
}
}