唯一性判断【函数-checkFieldUnique (fieldName, fromName, name)】

函数格式：
checkFieldUnique (fieldName, fromName, name)
函数说明：
fieldName: 字段名
fromName:  表单名
name: 唯一值
示例：
实现checkFieldUnique (fieldName, fromName, name)函数的应用
function checkFieldUnique(fieldName,fromName,name){
        var doc = $CURRDOC.getCurrDoc();
        var number = doc.getItemValueAsString(fieldName);
        var rnt = "";
        var dql = "$fromname = '"+fromName+"' AND "+fieldName+" = '"+number+"'";
        if(doc != null){
                 dql += "AND $id <> '"+doc.getId()+"'";
        }
        var count = countByDQL(dql);
        if(count > 0){
                 rnt = "'"+name+"' already exists.";
        }
        return rnt;
}
调用
#include " validationlib";
checkFieldUnique ("fieldName"," fromName"," name");