druid下的Connection.getSchema()为何直接抛出异常？?报错

我使用druid-1.0.31时，Connection的getSchema()方法报错。看了下源码，定位到com.alibaba.druid.proxy.jdbc.ConnectionProxyImpl.java，相关实现如下：

    public void setSchema(String schema) throws SQLException {
        throw new SQLFeatureNotSupportedException();
    }

    public String getSchema() throws SQLException {
        throw new SQLFeatureNotSupportedException();
    }

    public void abort(Executor executor) throws SQLException {
        throw new SQLFeatureNotSupportedException();
    }

    public void setNetworkTimeout(Executor executor, int milliseconds) throws SQLException {
        throw new SQLFeatureNotSupportedException();
    }

    public int getNetworkTimeout() throws SQLException {
        throw new SQLFeatureNotSupportedException();
    }

我想问一下，这里的几个方法为什么要直接抛出异常？在这种情况下我应该如何获取schema name？