Value of employee name not display based on employee id autocomplete?

Question

1.00/5 (3 votes)

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I work on ASP.NET MVC auto complete project. I face issue I can't display Employee Name on input text Id LineManagerName when changing auto complete employeeId.

Employee Id represents:

@Html.EditorFor(model => model.LineManager, new { htmlAttributes = new { @class = "form-control", id = "txtLineManagerId" } })

Employee Name represent

When select employee Id from list of auto complete employee Name not display on input text LineManagerName based on changed id on txtLineManagerId

What I have tried:

public ActionResult GetAllEmployeeBasedSearchText(string searchText)
        {
            JDEUtility jde = new JDEUtility();
         
            List<object> employeeListCriteria = new List<object>();
            employeeListCriteria = jde.GetAllEmployeeBasedSearchText(searchText);
            return Json(employeeListCriteria, JsonRequestBehavior.AllowGet);

        }
       public static List<object> GetAllEmployeeBasedSearchText(string searchText)
        {
            OleDbConnection con = new OleDbConnection(connectionString);
        
            string query = "";

            query = "SELECT cast(EMP.YAAN8 as varchar(20)) as EmployeeID,EMP.YAALPH AS EmployeeName FROM CRPDTA.F060116 EMP WHERE cast(EMP.YAAN8 as varchar(20)) LIKE '%" + searchText + "%' WITH UR";


            List<object> ApplicationsDataValues = new List<object>();
            try
            {
                
                using (var command = con.CreateCommand())
                {
                    command.CommandText = query;
                    command.CommandType = CommandType.Text;


                    command.Connection.Open();

                    using (var reader = command.ExecuteReader())
                    {
                        while (reader.Read())
                        {
                            ApplicationsDataValues.Add(new
                            {
                                
                                EmployeeID = reader.GetFieldValue<string>(0) 

                            });
                        }
                        reader.Close();
                    }

                }
                con.Close();
                return  ApplicationsDataValues;  
            }
            catch (Exception e)
            {
                return new List<object>();
            }
        }

    $(document).ready(function () {
        $("#txtLineManagerId").autocomplete({
            source: function (request, response) {
                var searchText = $("#txtLineManagerId").val();
                console.log("search text" + searchText)
                $.ajax({
                    url: '@Url.Action("GetAllEmployeeBasedSearchText", "Resignation")',
                    data: { searchText: searchText },
                    method: "GET",
                    dataType: "json",
                    success: function (data) {
                   
                        response($.map(data, function (item) {
                            console.log("data is" + item.EmployeeID);
                            return { label: item.EmployeeID, value: item.EmployeeID };

                        }))

                    }
                });
            }
        });
    });

Posted 23-Aug-23 10:53am

ahmed_sa

Updated 29-Aug-23 1:32am

Deeksha Shenoy

v2

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OriginalGriff · Accepted Answer · 2023-08-23T18:40:00

Never concatenate strings to build a SQL command. It leaves you wide open to accidental or deliberate SQL Injection attack which can destroy your entire database. Always use Parameterized queries instead.

When you concatenate strings, you cause problems because SQL receives commands like:

SQL

SELECT * FROM MyTable WHERE StreetAddress = 'Baker's Wood'

The quote the user added terminates the string as far as SQL is concerned and you get problems. But it could be worse. If I come along and type this instead: "x';DROP TABLE MyTable;--" Then SQL receives a very different command:

SQL

SELECT * FROM MyTable WHERE StreetAddress = 'x';DROP TABLE MyTable;--'

Which SQL sees as three separate commands:

SQL

SELECT * FROM MyTable WHERE StreetAddress = 'x';

A perfectly valid SELECT

SQL

DROP TABLE MyTable;

A perfectly valid "delete the table" command

SQL

--'

And everything else is a comment.
So it does: selects any matching rows, deletes the table from the DB, and ignores anything else.

So ALWAYS use parameterized queries! Or be prepared to restore your DB from backup frequently. You do take backups regularly, don't you?