Question

我有这个查询（就像一个case语句，我可以使用并修复它）

select *
from mytable
where 1=1 
and (isNull(ID, 0) = 0 OR UtilityID IN (9,40))

我也想添加另一条语句

select *
from mytable
where 1=1 
and UtilityID NOT IN (9,40)

过程中发生的所有事情都在发生，因此要使用declare @something之类的变量，因此如果将其作为1传递，请使用第一条语句，如果if 0传递，请使用后者。

Answer 1

当我欣赏Dale的回答中的天才时，我发现它更具可读性：

IF @something = 0 
BEGIN
  select *
  from mytable
  where ID IS NULL OR ID = 0 OR UtilityID IN (9,40);
END
IF @something = 1
BEGIN
  select *
  from mytable
  where UtilityID NOT IN (9,40);
END

这是过程代码，因此使用IF来控制流程。还扩展并简化了where子句

Answer 2

我想我理解您的逻辑，忽略了您只想在variables: { where: { league: { name_contains: "some league name" }, teams: { name_contains: "some teams name" } } }时才允许const SEARCH_QUERY = gql` query SEARCH_QUERY($where: JSON) { games(where: $where) { id teams { id name } league { id name } } }的{{1}}（什么都不做）。应该这样做：

const router = require("express").Router()
const mailer = require('../controllers/mailerController')

router
    .route('/your-end-point-here')
    .post(mailer.addToMailList)

module.exports = router

对于较大的查询，性能更高的方法可能是：

const nodemailer = require('nodemailer')


module.exports =
{
    addToMailList: function (req, res)
    {
        let { newUser } = req.body

        let transporter = nodemailer.createTransport({
            service:'gmail',
            auth: {
                user: 'yourcompanyemail@gmail.com',
                pass: 'somepassword'
            }

        });

        message = "You just logged in!"

        // setup email data with unicode symbols
        let mailOptions = {
            from: '"Your Company Name" <yourcompanyemail@gmail.com>', // sender address
            to: newUser, // list of receivers
            subject: "Welcome Letter", // Subject line
            text: message // plain text body
        };

        // send mail with defined transport object
        transporter.sendMail(mailOptions, (error, info) => {
            if (error) {
                return
                console.log(error);
            }
            res.json(info);

        });


    }

}

PS：希望您的1=1永远不会id = 0，它应该对此有所限制。

根据参数有条件地修改查询

2 个答案: