FBBlob(FBManagedConnection mc, long blob_id) { this.mc = mc;
FBBlob(FBConnection c, long blob_id) { this.c = c;
    FBBlob(FBManagedConnection mc, long blob_id) {        this.mc = mc;        this.blob_id = blob_id;        this.bufferlength = mc.getBlobBufferLength();    }