LinkarClientReadAsync Method

Linkar Framework for .NET and Core

Reads one or several records of a file in a asynchronous way with JSON input and output format.

Namespace: Linkar.Functions.Persistent.JSON
Assembly: Linkar.Functions.Persistent.JSON (in Linkar.Functions.Persistent.JSON.dll) Version: 2.3.1

Syntax

C++

Copy

public Task<string> ReadAsync(
	string filename,
	string records,
	string dictionaries = "",
	ReadOptions readOptions = null,
	JSON_FORMAT jsonFormat = JSON_FORMAT.JSON,
	string customVars = "",
	int receiveTimeout = 0
)

Public Function ReadAsync ( 
	filename As String,
	records As String,
	Optional dictionaries As String = "",
	Optional readOptions As ReadOptions = Nothing,
	Optional jsonFormat As JSON_FORMAT = JSON_FORMAT.JSON,
	Optional customVars As String = "",
	Optional receiveTimeout As Integer = 0
) As Task(Of String)

public:
Task<String^>^ ReadAsync(
	String^ filename, 
	String^ records, 
	String^ dictionaries = L"", 
	ReadOptions^ readOptions = nullptr, 
	JSON_FORMAT jsonFormat = JSON_FORMAT::JSON, 
	String^ customVars = L"", 
	int receiveTimeout = 0
)

member ReadAsync : 
        filename : string * 
        records : string * 
        ?dictionaries : string * 
        ?readOptions : ReadOptions * 
        ?jsonFormat : JSON_FORMAT * 
        ?customVars : string * 
        ?receiveTimeout : int 
(* Defaults:
        let _dictionaries = defaultArg dictionaries ""
        let _readOptions = defaultArg readOptions null
        let _jsonFormat = defaultArg jsonFormat JSON_FORMAT.JSON
        let _customVars = defaultArg customVars ""
        let _receiveTimeout = defaultArg receiveTimeout 0
*)
-> Task<string>

Parameters

filename String: File name to read.
records String: A list of item IDs to read, separated by the Record Separator character (30). Use StringFunctions.ComposeRecordIds to compose this string
dictionaries String (Optional): List of dictionaries to read. You may use the format LKFLDx where x is the attribute number.
readOptions ReadOptions (Optional): Object that defines the different reading options of the Function: Calculated, dictClause, conversion, formatSpec, originalRecords.
jsonFormat JSON_FORMAT (Optional): Enum JSON_FORMAT specifies the desired output format: standard JSON, JSON_DICT format, or JSON_SCH format
customVars String (Optional): Free text sent to the database allows management of additional behaviours in SUB.LK.MAIN.CONTROL.CUSTOM, which is called when this parameter is set.
receiveTimeout Int32 (Optional): Maximum time in seconds that the client will wait for a response from the server. Default = 0 to wait indefinitely.

Return Value

TaskString
The results of the operation.

Example

C++

Copy

using Linkar;
using Linkar.Functions.Persistent.JSON;

class Test
    {
        public string MyRead()
        {
            string result = "";
            try
            {
                CredentialOptions credentials = new CredentialOptions("127.0.0.1", "EPNAME", 11300, "admin", "admin");
                LinkarClient client = new LinkarClient();
                client.Login(credentials);
                ReadOptions options = new ReadOptions(true);
                result = client.ReadAsync("LK.CUSTOMERS",
                    "{" +
                    "  \"RECORDS\": [" +
                    "    {" +
                    "      \"LKITEMID\": \"2\"" +
                    "    }" +
                    "  ]" +
                    "}",
                "", options).Result;
                client.Logout();
            }
            catch (Exception ex)
            {
                string error = ex.Message;
                // Do something
            }
            return result;
        }
    }

Imports Linkar
Imports Linkar.Functions.Persistent.JSON

Class Test

    Public Function MyRead() As String
        Dim result As String = ""

        Try
            Dim credentials As CredentialOptions = New CredentialOptions("127.0.0.1", "EPNAME", 11300, "admin", "admin")

            Dim client As LinkarClient = New LinkarClient()

            client.Login(credentials)
            Dim options As ReadOptions = New ReadOptions(True)
            result = client.ReadAsync("LK.CUSTOMERS",
                "{" +
                "  \"RECORDS\": [" +
                "    {" +
                "      \"LKITEMID\": \"2\"" +
                "    }" +
                "  ]" +
                "}",
            "", options).Result
            client.Logout()
        Catch ex As Exception
            Dim[error] As String = ex.Message
            ' Do something

        End Try

        Return result
  End Function
End Class

Reference

LinkarClient Class

Linkar.Functions.Persistent.JSON Namespace