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ARSperl
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   <H2><CODE>ars_SetField(ctrl, schema, fieldId, fieldHash)</CODE></H2>

      This function modifies an existing field. You must first
      populate the <CODE>fieldHash</CODE> before calling this routine.
      <P><CODE>schema</CODE> is the name of the schema containing the field.
      <P><CODE>fieldId</CODE> is the numeric id of the field.
      <P><CODE>fieldHash</CODE> is a partially assigned 
      <A HREF="ds_field_hash.html">Field Attributes</a> hash. 

      <P>

      <DL>
          <DT><B>On success</B><DD>
              Returns 1
          <DT><B>On failure</B><DD>
              Returns 0
      </DL>

      <P>Example:

      <P><BLOCKQUOTE>
      <I> This example increases the content length of a character field. It also specifies
      write permission for group 505 and read permission for group 506.
      </I></BLOCKQUOTE>

      <PRE>
      ($fd = ars_GetField($c, "Schema", $fieldId )) ||
	    die $ars_errstr;
	
      $fd->{limit}{maxLength} += 30;

      ars_SetField( $c, "Schema", $fieldId, {
        permissions => { 505 => "change", 506 => "view" },
        limit       => $fd->{limit},
      } ) || die $ars_errstr;
      </PRE>

<P>
<I>This function was introduced in version 1.90 of ARSperl</I>
<P>

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