clearWarnings(); // The paramCount was set when the statement was prepared if ((parameterIndex <= 0) || (parameterIndex > paramCount)) { throw new SQLException(”Invalid parameter number: ” + parameterIndex); } // If the parameter has already been set, clear it if (boundParams.get(new Integer(parameterIndex)) != null) { boundParams.remove(new Integer(parameterIndex)); } } Because the CommonValue class does not yet support all of the JDBC data types, not all of the set methods have been implemented in the SimpleText driver. You can see, however, how easy it would be to fully implement these methods once CommonValue supported all of the necessary data coercion. What Is It? Another way to set parameter values is by using the setObject method. This method can easily be built upon the other set methods. Of interest here is the ability to set an Object without giving the JDBC driver the type of driver being set. The SimpleText driver implements a simple method to determine the type of object, given only the object itself: protected int getObjectType( Object x) throws SQLException { // Determine the data type of the Object by attempting to cast // the object. An exception will be thrown if an invalid casting // is attempted. try { if ((String) x != null) { return Types.VARCHAR; } } catch (Exception ex) { } try { if ((Integer) x != null) { return Types.INTEGER; } } catch (Exception ex) { } try { if ((byte[]) x != null) { return Types.VARBINARY;
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