Mastering the art of inserting or updating data in a database using ExpressJS

Question

Mastering the art of inserting or updating data in a database using ExpressJS

I am trying to update the database value if it does not exist, and insert data if it does. I have attempted a method but unfortunately, it was not successful. Can anyone help me figure out how to achieve this efficiently?

fetchRecordFromFile.forEach(el => {
    if(getDataFromDB.indexOf(el.city) > -1)
        {
            Post.create(el ,function(err,data_news){
                if(err){
                    console.log(err)
                }
                else{
                    console.log("Inserted which are not before into database")
                }
            })
        }
});

javascript mongodb express

Answer 1

Answer №1

Adding data to a database is an operation that occurs asynchronously. Therefore, when performing these operations in a loop, it's important to use for-in loops.

To improve the function, consider implementing the following changes:

async function insertRecords() {
  for (const record of fetchRecordFromFile) {
    const cityRecord = await Post.find({city: record.city});
    if (!cityRecord[0]) {
      try {
        const dbRecord = await Post.create(record);
        console.log("Data inserted into the database successfully");
      } catch (error) {
        console.log(error);
      }
    } else {
      console.log('Record already exists');
      // Add update logic here
      // For example:
      // const recordUpdate = await Post.update(cityRecord[0].id, record);
    }
  }
}

Answer 2

Adding data to a database is an operation that occurs asynchronously. Therefore, when performing these operations in a loop, it's important to use for-in loops.

To improve the function, consider implementing the following changes:

async function insertRecords() {
  for (const record of fetchRecordFromFile) {
    const cityRecord = await Post.find({city: record.city});
    if (!cityRecord[0]) {
      try {
        const dbRecord = await Post.create(record);
        console.log("Data inserted into the database successfully");
      } catch (error) {
        console.log(error);
      }
    } else {
      console.log('Record already exists');
      // Add update logic here
      // For example:
      // const recordUpdate = await Post.update(cityRecord[0].id, record);
    }
  }
}

Answer 3

Answer №2

It's always advisable to avoid performing a database query within a loop. Instead, consider using insertMany when you need to add multiple items and then analyze the result.nModified or any related field to verify how many documents were successfully inserted.

If your goal is to update existing data or introduce new data with the help of $set or $unset operator, opt for UpdateMany.

Answer 4

It's always advisable to avoid performing a database query within a loop. Instead, consider using insertMany when you need to add multiple items and then analyze the result.nModified or any related field to verify how many documents were successfully inserted.

If your goal is to update existing data or introduce new data with the help of $set or $unset operator, opt for UpdateMany.

Mastering the art of inserting or updating data in a database using ExpressJS

Answer №1

Answer №2

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