public byte getByte(String columnName) throws SQLException {
        return getByte(getColIdxByName(columnName));
    }
Retrieves the value stored in the designated column
of the current row as a <code>byte</code> value.

@param columnName a <code>String</code> object giving the SQL name of
       a column in this <code>CachedRowSetImpl</code> object
@return the column value as a <code>byte</code> in the Java programming
language; if the value is SQL <code>NULL</code>, the result is <code>0</code>
@throws SQLException if (1) the given column name is not the name of
a column in this rowset, (2) the cursor is not on one of
this rowset's rows or its insert row, or (3) the designated
column does not store an SQL <code><B>TINYINT</B>, SMALLINT, INTEGER,
BIGINT, REAL, FLOAT, DOUBLE, DECIMAL, NUMERIC, BIT, CHAR,
VARCHAR</code> or <code>LONGVARCHAR</code> value. The
bold type designates the recommended return type
src/main/java/org/replicadb/rowset/sun/rowset/CachedRowSetImpl.java