带加减法的加法和减法赋值运算符

问题描述

我想通过对Sequelize进行简单添加来进行更新.

I would like to do an update by doing a simple addition on Sequelize.

表:

id || data
 1 ||  10

样本:

db.table.update({ data : 1 }, { where: { id: 1 }});

此查询之后

id || data
 1 ||  11

我知道这是一个简单的问题，但是我找不到解决方案.

I know it's a simple question, but I could not find the solution.

我可以加减哪个运算符?谢谢

Which operator can I add and subtract? Thank you

推荐答案

在这里是:

db.table.update({ field: Sequelize.literal('data + 1') }, { where: { id: 1 }}))

OR

User.findById(1).then(user => {
  // -----> First Way
  return user.increment('my-integer-field', {by: 2});
  // -----> Second Way
  return user.increment([ 'my-integer-field', 'my-very-other-field' ], {by: 2})
  // -----> Third Way
  return user.increment({
     'my-integer-field':    2,
     'my-very-other-field': 3
  })
});

您也可以通过将increment替换为decrement来执行decrement.

You can also do decrement by just replacing increment with decrement.

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