Question

我已经用postgres数据库创建了一个nodejs api，用于处理所有的crud操作。我有一个.html页面，该页面由具有各种输入字段的表单组成，通过这些表单，我能够成功获取数据并将其成功发布到数据库。我想对表单应用“ put”请求，并使用该特定列（html表单输入字段之一）的新值更新该行，同时保留该行其他列的值。例如：如果我的表单中包含“姓名，电子邮件，密码，性别，资格，地址”之类的字段，并且如果我仅更新“电子邮件”字段，则我希望所有其他列值反映其值以及更新的字段

我在互联网上搜索了我的查询，但发现了与“更新所有行”或“更新多行的所有列”相关的帖子

//UPDATE A PROFILE
app.put('/home/profile/:name',(req,res,next)=>{
    const name = req.params.name;
    pg.connect(connectionString, (err, client, done) => {
        if(err) {
            done();
            console.log(err);
            return res.status(500).json({success:false, data:err});
        }
        const name = req.body.name;
        const email = req.body.email;
        const password = req.body.password;
        const gender = req.body.gender;
        const qualification = req.body.qualification;
        const address = req.body.address;
    const query =client.query('UPDATE profile SET name = $1, email =$2, password =$3, gender=$4, qualification=$5, address=$6 WHERE name = $1',[name, email, password, gender, qualification, address],(err,rows,fields)=>{
        if(!err)
            res.send('Profile updated succesfully !!');
        else
            console.log(err);
    })  
    })

})

//UPDATE A PROFILE
app.put('/home/profile/:name',(req,res,next)=>{
    const name = req.params.name;
    pg.connect(connectionString, (err, client, done) => {
        if(err) {
            done();
            console.log(err);
            return res.status(500).json({success:false, data:err});
        }
        const name = req.body.name;
        const email = req.body.email;
        const password = req.body.password;
        const gender = req.body.gender;
        const qualification = req.body.qualification;
        const address = req.body.address;
    const query =client.query('UPDATE profile SET name = ($1), email =($2), password =($3), gender=($4), qualification=($5), address=($6) WHERE name = ($1)',[name, email, password, gender, qualification, address],(err,rows,fields)=>{
    if(!err)
        {
    query.on('row', (row) => {
          results.push(row);
        });

        query.on('end', () => {
          done();
console.log("Profile updated successfullyy !!")
//        return res.json(results);


        });
        }else
            console.log(err);
    });

    })

})

如果我在上面运行我的代码，则会收到类似-'Unexpected token，在JSON位置193'的错误

Answer 1

与其在回叫中使用“字段”，不如使其简单地进行更新。并仅为修改后的字段构建此动态查询逻辑，并在其余调用PUT方法中传递这些键值以进行更新。根据此参考动态构建列：Easier way to update data with node-postgres?接受了答案。

const query =client.query('UPDATE profile SET name = ($1), email =($2), password =($3), gender=($4), qualification=($5), address=($6) WHERE name = ($1)',[name, email, password, gender, qualification, address],
(error, results) => {
      if (error) {
        throw error
      }
      console.log('profile updated')
    }
);

Ref：https://blog.logrocket.com/setting-up-a-restful-api-with-node-js-and-postgresql-d96d6fc892d8

使用单个查询更新一行的多列

1 个答案: