Question

我有一个产品表，order_ID列需要从5000开始

我试过这个：

if (record.Order_ID) {
  record.Order_ID = record.Order_ID + 1;
}
else {
  record.Order_ID = 5000;
}

Answer 1

如果您需要使用云端硬盘表来实现它：

// onCreate model's event handler 
// it receives about-to-create record as parameter
var ID_START_FROM = 5000;

var lock = LockService.getScriptLock();
// we need to lock our script, to prevent IDs inconsistency
// wait 3 seconds for script lock
lock.waitLock(3000);

// Run query to get latest ID
var query = app.models.Product.newQuery();
query.sorting.Id._descending();
query.limit = 1;

var records = query.run();
var next_id = records.length > 0 ? records[0].Id + 1 : ID_START_FROM;

record.Id = next_id;
// ...do other stuff

lock.releaseLock();

如果您使用Cloud SQL作为数据后端，则可以轻松更改表格：

ALTER TABLE Product AUTO_INCREMENT = 5000;

如何在5000 app中制作app maker中的自动增量字段

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