Sequelize 一张表的多个计数

Question

从我的表中的一列中，我想获得这些列中值类型的总和计数。例如，一列是：

|paymentGateway |
---------------
|   Paystack    |
|   Flutterwave |
|   NIBSS       |
|   PAGA        |
|   Interswitch |
|   Paystack    |
|   Flutterwave |
|   NIBSS       |
|   PAGA        |
|   Interswitch |
|   Paystack    |
|   Flutterwave |
|   NIBSS       |
|   PAGA        |
|   Interswitch |

我运行了查询Progress DB Viewer，它工作正常。这是查询：

SELECT
  "paymentGateway",
  SUM(1) FILTER (WHERE "paymentGateway" = 'Paystack') AS paystack,
  SUM(1) FILTER (WHERE "paymentGateway" = 'NIBSS') AS nibss,
  SUM(1) FILTER (WHERE "paymentGateway" = 'Flutterwave') AS flutterwave,
  SUM(1) FILTER (WHERE "paymentGateway" = 'Interswitch') AS interswitch,
  SUM(1) FILTER (WHERE "paymentGateway" = 'PAGA') AS paga
FROM
  "Transactions"
GROUP BY
  "paymentGateway"

上面的查询工作正常，并在这里给我这个结果：

现在，我正在尝试在我的代码中执行相同的查询。因此，我尝试先运行原始查询：

db.sequelize.query('SELECT  "paymentGateway",   SUM(1) FILTER (WHERE "paymentGateway" = "Paystack") AS paystack,    SUM(1) FILTER (WHERE "paymentGateway" = "NIBSS") AS nibss,  SUM(1) FILTER (WHERE "paymentGateway" = "Flutterwave") AS flutterwave,  SUM(1) FILTER (WHERE "paymentGateway" = "Interswitch") AS interswitch,  SUM(1) FILTER (WHERE "paymentGateway" = "PAGA") AS paga FROM    "Transactions" GROUP BY     "paymentGateway"').then(data => {
  console.log('Query Result', data)
  return res.status(200).send({ message: 'Completed Successfully' })
}).catch(err => {
  console.log('Query Error: ', err)
  return res.status(200).send({ message: 'Completed Successfully' })
})

哪个给了我 SequelizeDatabaseError: column "Paystack" does not exist

我决定做一些谷歌搜索并通读Sequelize文档。那是我得到这个的地方：

Transaction.findAndCountAll({
    attributes: [
      [db.sequelize.fn('COUNT', db.sequelize.col('paymentGateway') === 'NIBSS'), 'nibss'],
      [db.sequelize.fn('COUNT', db.sequelize.col('paymentGateway') === 'Paystack'), 'paystack'],
      [db.sequelize.fn('COUNT', db.sequelize.col('paymentGateway') === 'Flutterwave'), 'flutterwave'],
      [db.sequelize.fn('COUNT', db.sequelize.col('paymentGateway') === 'Interswitch'), 'interswitch'],
      [db.sequelize.fn('COUNT', db.sequelize.col('paymentGateway') === 'PAGA'), 'paga']
    ],
    group: '"paymentGateway"'
  }).then(data => {
    // console.log('Query Result', data)
    console.log('Query Length', data.count)
    console.log('Query Datavalues', data.rows.map(obj => obj.dataValues))
    return res.status(200).send({ message: 'Completed Successfully' })
  }).catch(err => {
    console.log('Query Error: ', err)
    return res.status(200).send({ message: 'Completed Successfully' })
  })

上面的查询给了我一个我理解的结果，但与之交互并没有那么有意义。

Query Length [ { count: '3940' },
  { count: '3838' },
  { count: '4066' },
  { count: '4092' },
  { count: '4065' } ]
Query Datavalues [ { nibss: '3940',
    paystack: '3940',
    flutterwave: '3940',
    interswitch: '3940',
    paga: '3940' },
  { nibss: '3838',
    paystack: '3838',
    flutterwave: '3838',
    interswitch: '3838',
    paga: '3838' },
  { nibss: '4066',
    paystack: '4066',
    flutterwave: '4066',
    interswitch: '4066',
    paga: '4066' },
  { nibss: '4092',
    paystack: '4092',
    flutterwave: '4092',
    interswitch: '4092',
    paga: '4092' },
  { nibss: '4065',
    paystack: '4065',
    flutterwave: '4065',
    interswitch: '4065',
    paga: '4065' } ]

如果有人能帮助我理解我做错了什么，我将不胜感激。谢谢

Answer 1

所以，经过更多的谷歌搜索，我终于能够自己解决这个问题。下面是我的实现：

Transaction.findAll({
  attributes: [
    'paymentGateway',
    [db.sequelize.fn('COUNT', db.sequelize.col('paymentGateway')), 'count']
  ],
  group: 'paymentGateway',
  raw: true,
  logging: true
}).then(data => {
  console.log('Query Result', data)
  return res.status(200).send({ message: 'Completed Successfully' })
})

结果：

Query Result 
[ 
  { paymentGateway: 'Paystack', count: '3966' },
  { paymentGateway: 'PAGA', count: '3954' },
  { paymentGateway: 'Flutterwave', count: '3995' },
  { paymentGateway: 'Interswitch', count: '4118' },
  { paymentGateway: 'NIBSS', count: '3968' } 
]