var srcId = param;//param变量为值转换的入参
var sql = "SELECT fnumber from T_BD_Currency where fid = ?";//通过源单id查找number值
var number = query_value($src,sql,[srcId],[VARCHAR]); //$src为源连接，本例子中为EAS
//通过number值查找目标单id，注意：查表时如果是苍穹的表，应该加上分库标识
sql = "SELECT fid from T_BD_CURRENCY@SYS where fnumber = ?";
var tarId = query_value($tar,sql,[number],[VARCHAR]); //$tar为目标连接，本例子中为苍穹
return tarId;
更多请参考：https://club.kdcloud.com/school/3470, https://club.kdcloud.com/school/2953