using Microsoft.Data.SqlClient;

using System.Data;

​

[HttpGet]

public IActionResult ExecuteQuery(string requestType, string parameter)

{

    string connectionString = Configuration.GetConnectionString("DefaultConnection");

    string sqlQuery;

​

    // Retrieve the SQL query for the specified request type from the configuration settings

    sqlQuery = Configuration.GetSection("SqlQueries").GetValue<string>(requestType);

​

    if (string.IsNullOrEmpty(sqlQuery))

    {

        return BadRequest("Invalid requestType parameter");

    }

​

    // Execute the SQL query using the connection string and parameter

    using (SqlConnection connection = new SqlConnection(connectionString))

    {

        using (SqlCommand command = new SqlCommand(sqlQuery, connection))

        {

            command.Parameters.Add("@param", SqlDbType.VarChar).Value = parameter;

​

            connection.Open();

            DataTable dataTable = new DataTable();

            using (SqlDataAdapter dataAdapter = new SqlDataAdapter(command))

            {

                dataAdapter.Fill(dataTable);

            }

            connection.Close();

​

            // Convert the DataTable to a JSON string and return it as the response

            string jsonResult = JsonConvert.SerializeObject(dataTable, Formatting.Indented);

            return Ok(jsonResult);

        }

    }

}