判断字段不能重复【函数-notRepeated (fieldName, tableName, description, andSQL)】

函数格式：
notRepeated (fieldName, tableName, description, andSQL)
函数说明：
fieldName: 字段名
tableName: 对比字段名
description: 描述
andSQL:添加额外条件（可不传）
示例：
实现notRepeated (fieldName, tableName, description, andSQL)函数的应用
function notRepeated(fieldName, tableName, description, andSQL) {
        var doc = $CURRDOC.getCurrDoc();
        var returnStr = "";
        var dql = "$formname='" + tableName + "' and " + fieldName + "='" + getItemValue(fieldName) + "'";
        if (andSQL) {
                dql += " and " + andSQL;
        }
        if (doc != null) {
                dql += " and $id<>'" + doc.getId() + "'";
        }
        var count = countByDQL(dql);
        if (count > 0) {
                returnStr = "'" + description + "' 不能重复！";
        }
        return returnStr;
}

调用
#include " validationlib";
notRepeated (" fieldName"," tableName"," description"," andSQL");