Javascript 在nodejs中创建restapi
我有一个postgresql表,它看起来像:Javascript 在nodejs中创建restapi,javascript,sql,node.js,postgresql,Javascript,Sql,Node.js,Postgresql,我有一个postgresql表,它看起来像: man_id subgroup power group 1 sub_A 1 Group_A 2 Sub_B -1 Group_A 3 Sub_A -1 Group_B 4 Sub_B 1 Group_B 5 Sub_A -1 Group_A 6 Sub_B 1 Group_A 7 Sub_A -1 Group_B 8 Sub_B 1 Group_B 我们这里有一个功率计算,它的工作原理是 Total Power of Subgroup Sub_A
man_id subgroup power group
1 sub_A 1 Group_A
2 Sub_B -1 Group_A
3 Sub_A -1 Group_B
4 Sub_B 1 Group_B
5 Sub_A -1 Group_A
6 Sub_B 1 Group_A
7 Sub_A -1 Group_B
8 Sub_B 1 Group_B
我们这里有一个功率计算,它的工作原理是
Total Power of Subgroup Sub_A in the Group Group_A is (1 + (-1) ) = 0
Total Power of Subgroup Sub_B in the Group Group_A is ((-1) + 1 ) = 0
Total Power of Subgroup Sub_A in the Group Group_B is ((-1) + (-1) ) = -2
Total Power of Subgroup Sub_B in the Group Group_B is (1 + 1 ) = 2
So the power of `Sub_A` in the Group_A is not equal to power of Sub_A in the Group_B
So the power of Sub_B in the Group_A is not equal to power of Sub_B in the Group_B
我想在nodejs中创建一个restapi,在这里我可以使用子组名称进行查询。如果对于相同的子组名称,所有其他组名称的幂相等,则它将返回yes,否则返回No
例如,
http://localhost:3000/api/check/Sub_A
将返回NO
http://localhost:3000/api/check/Sub_B
将返回NO
我可以连接数据库并列出JSON中的所有条目。下面是我的代码
http://localhost:3000/api/lists
将返回数据库中的所有条目
query.js
var promise = require('bluebird');
var options = {
// Initialization Options
promiseLib: promise
};
var pgp = require('pg-promise')(options);
var connectionString = 'postgres://localhost:5432/lists';
var db = pgp(connectionString);
// add query functions
module.exports = {
getAllList: getAllList
};
function getAllList(req, res, next) {
db.any('select * from dataset')
.then(function (data) {
res.status(200)
.json({
status: 'success',
data: data,
message: 'Retrieved ALL Data'
});
})
.catch(function (err) {
return next(err);
});
}
index.js
var express = require('express');
var router = express.Router();
var db = require('../queries');
router.get('/api/lists', db.getAllList);
module.exports = router;
您可以尝试使用Express request对象中的
req.params
对象
http://localhost:3000/api/check/{Subgroup}
下面的代码可能会对您有所帮助
app.get('/api/check/:subgroup?',(req,res)=>{
const subgroup=req.params.subgroup;
res.json(…);
});代码>实际上,我正在寻找这个,如果对于相同的子组名称,所有其他组名称的幂相等,那么它将返回yes,否则返回No。