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ServerBase/Helper/MySqlConnectorHelper.cs

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+using System;
+using System.Collections.Generic;
+using System.Data;
+using System.Data.Common;
+using System.Linq;
+using System.Reflection.Metadata.Ecma335;
+using System.Runtime.CompilerServices;
+using System.Text;
+using System.Threading.Tasks;
+
+
+using MySqlConnector;
+
+
+using ServerCore; using ServerBase;
+
+
+namespace ServerBase;
+
+//=============================================================================================
+// MySqlConnector 관련 각종 지원 함수
+//
+// author : kangms
+// 
+//=============================================================================================
+public static class MySqlConnectorHelper
+{
+    public static async Task<Result> simpleTryConnectToDb(string connectionString)
+    {
+        var result = new Result();
+        var err_msg = string.Empty;
+
+        using (var db_connector = new MySqlDbConnector())
+        {
+            var error_cdoe = await db_connector.initMySql(connectionString);
+            if (error_cdoe.isFail())
+            {
+                err_msg = $"Failed to initMySql() !!! : errCode:{error_cdoe} - connectString:{connectionString}";
+                result.setFail(error_cdoe, err_msg);
+            }
+        }
+
+        return result;
+    }
+
+    public static async Task<Result> simpleQueryExecuteForReaderAsync( string queryString, Func<MySqlDataReader, ServerErrorCode> readFunc
+                                                                     , string connectionString
+                                                                     , Int16 queryTimeoutSec = 15
+                                                                     , Int16 retryIntervalMSec = 1000, Int16 retryCount = 3 )
+    {
+        var result = new Result();
+        var err_msg = string.Empty;
+
+        using ( var db_connector = new MySqlDbConnector() )
+        {
+            for(var i = 0; i <= retryCount; i++)
+            {
+                var error_cdoe = await db_connector.initMySql(connectionString);
+                if (error_cdoe.isSuccess())
+                {
+                    error_cdoe = await db_connector.querySQL(queryString, readFunc);
+                    if(error_cdoe.isSuccess())
+                    {
+                        // 성공하면 즉시 반환 한다 !!!
+                        result.setSuccess();
+                        return result;
+                    }
+                }
+
+                // Db와 연결이 끊어진 경우는 재시도 설정에 따라 추가 처리 한다.
+                if (ConnectionState.Closed == db_connector.getLastConnectionState())
+                {
+                    err_msg = $"Failed to retry Open MySql !!! : errCode:{error_cdoe}";
+                    result.setFail(error_cdoe, err_msg);
+
+                    if (i > 0)
+                    {
+                        await Task.Delay(retryIntervalMSec);
+
+                        err_msg = $"Retry Query !!! : retriedCount:{i}, queryString:{queryString} - retryableCount:{retryCount}";
+                        Log.getLogger().error(err_msg);
+                    }
+                }
+                // 기타 오류 발생시 실패로 처리 한다.
+                else
+                {
+                    err_msg = $"Failed to simpleQueryExecuteForReaderAsync() !!! : errCode:{error_cdoe}, queryString:{queryString} - retryCount:{retryCount}";
+                    Log.getLogger().error(err_msg);
+                    result.setFail(error_cdoe, err_msg);
+                    break;
+                }
+            }
+        }
+
+        return result;
+    }
+}