add update sql rows in one transaction sql in javascript

To add and update SQL rows in one transaction in JavaScript, we can use the mysql package in Node.js. We need to establish a connection to our database, perform the necessary SQL queries, and then commit the changes in a single transaction.

Here is an example using asynchronous JavaScript (with async/await):


index.tsx
const mysql = require('mysql');

const connection = mysql.createConnection({
  host: 'localhost',
  user: 'username',
  password: 'password',
  database: 'mydatabase'
});

const addAndUpdateInTransaction = async () => {
  connection.beginTransaction((error) => {
    if (error) throw error;

    const addQuery = 'INSERT INTO mytable (column1, column2) VALUES (?, ?)';
    const addData = ['value1', 'value2'];

    connection.query(addQuery, addData, (error, results, fields) => {
      if (error) {
        return connection.rollback(() => {
          throw error;
        });
      }

      const updateQuery = 'UPDATE mytable SET column2 = ? WHERE column1 = ?';
      const updateData = ['newvalue', 'value1'];

      connection.query(updateQuery, updateData, (error, results, fields) => {
        if (error) {
          return connection.rollback(() => {
            throw error;
          });
        }

        connection.commit((error) => {
          if (error) {
            return connection.rollback(() => {
              throw error;
            });
          }

          console.log('Transaction successful!');
          connection.end();
        });
      });
    });
  });
};

addAndUpdateInTransaction();
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In this example, we establish a connection to our database and create the addAndUpdateInTransaction function, which initiates a transaction using beginTransaction(). We then execute an INSERT query to add a new row to our table. If there is an error, we roll back the transaction and throw the error. If the INSERT query is successful, we execute an UPDATE query to update an existing row. Again, if there is an error, we roll back the transaction and throw the error. Finally, if both queries are successful, we commit the transaction using commit(). If there is an error in the commit, we again roll back the transaction and throw the error. Once the transaction is complete, we close the database connection using connection.end().

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