fix(core): enable SQL Server idle connection recovery

插件库/Lskj.Core/DBConfig.cs

@@ -381,6 +381,15 @@ namespace Lskj.Core
         {
             return Internet ? AESUtil.Decrypt(Connection3) : AESUtil.Decrypt(Connection4);
         }
+
+        private static string EnableSqlServerIdleConnectionResilience(string connectionString)
+        {
+            SqlConnectionStringBuilder builder =
+                new SqlConnectionStringBuilder(connectionString);
+            builder["ConnectRetryCount"] = 1;
+            return builder.ConnectionString;
+        }
+
         /// <summary>
         /// <para>说明：创建数据库连接</para>
         /// <para>创建人：龚宇超</para>
@@ -420,6 +429,10 @@ namespace Lskj.Core
                     providerName = "Dm";
                     SqlHelper.ConnectionType = ConnectionType.DmServer;
                 }
+                if (connectionType == ConnectionType.SqlServer)
+                {
+                    connStr = EnableSqlServerIdleConnectionResilience(connStr);
+                }
                 SqlHelper.dbFactory = DbProviderFactories.GetFactory(providerName);
                 if (SqlHelper._connection != null)
                 {