Remove Key SQL Method

The Remove Key (removeKey) function allows you to Remove a specific column (key) from a table within a given data source (database). This operation is useful when you need to modify the table structure by eliminating unnecessary columns. You can just use it to remove key from the database

Parameters:

1. dataname (Data Source Name):

   • Replace 'your_data_source_name' with the actual name of your data source (database).
   • This parameter specifies the database where the table exists.

2. tableName:

   • Replace 'your_table_name' with the name of the table from which you want to remove a column.
   • The table name identifies the target table for the operation.

3. keyToRemove:

   • Replace 'column_name_to_remove' with the name of the column (key) you want to remove.
   • Ensure that the specified column exists in the table.

Execution:

1. Setting Up the Data Source:

   • Ensure that you've established a connection to the specified data source (database) before calling the removeKey method.

2. Calling the removeKey Method:

   • Once you've set the appropriate values for dataname, tableName, and keyToRemove, invoke the removeKey method.
   • The method sends a query to the database engine to remove the specified column.

3. Handling the Result:

   • The method returns a promise that resolves with an object containing the following properties:
     • acknowledged: A boolean indicating whether the operation was successful.
     • message: A success message if the column removal is successful.
     • errorMessage: An error message if the operation encounters any issues.

Example Usage:

Suppose we have a table named Employees with columns id, name, age, and department. We want to remove the department column. Here's how you can use the removeKey method:

const dataname = 'your_data_source_name';
const tableName = 'Employees'; // Assume this table exists
const keyToRemove = 'department';
 
// Call the removeKey method
db.removeKey(dataname, tableName, keyToRemove)
  .then((result) => {
    if (result.acknowledged) {
      console.log(result.message); // Log success message
    } else {
      console.error(result.errorMessage); // Log error message
    }
  })
  .catch((error) => {
    console.error('An error occurred:', error); // Catch any unexpected errors
  });

Notes:

• Adjust the keyToRemove according to the specific column you want to delete.
• Handle any errors by catching exceptions using .catch().