upd

ZeroLevel.SQL/SqlDbConnectionFactory.cs

@@ -62,15 +62,22 @@ namespace ZeroLevel.SqlServer
             }
             dbConnectionString = new SqlConnectionStringBuilder(_currentConnectionString);
             dbConnectionString.Pooling = true;
-            dbConnectionString.MaxPoolSize = 50;
         }
 
         public SqlConnection CreateConnection()
+        {
+            try
             {
                 var connection = new SqlConnection(ConnectionString);
                 connection.Open();
                 return connection;
             }
+            catch (Exception ex)
+            {
+                Log.Error(ex, $"[SqlDbConnectionFactory.CreateConnection] {ConnectionString}");
+                throw;
+            }
+        }
 
         #region Helpers
 

ZeroLevel.SQL/SqlDbProvider.cs

@@ -76,6 +76,7 @@ namespace ZeroLevel.SqlServer
                         cmd.ExecuteNonQuery();
                     }
                 }
+                connection.Close();
             }
         }
 
@@ -87,12 +88,19 @@ namespace ZeroLevel.SqlServer
         public int ExecuteNonResult(string query, DbParameter[] par)
         {
             using (DbConnection connection = _factory.CreateConnection())
+            {
+                try
                 {
                     using (var cmd = CreateCommand(connection, query, par, Timeout))
                     {
                         return cmd.ExecuteNonQuery();
                     }
                 }
+                finally
+                {
+                    connection.Close();
+                }
+            }
         }
 
         public T Insert<T>(string insert_query, SqlParameter[] par)
@@ -108,6 +116,7 @@ namespace ZeroLevel.SqlServer
             }
             finally
             {
+                connection.Close();
                 connection.Dispose();
             }
         }
@@ -148,6 +157,7 @@ namespace ZeroLevel.SqlServer
                         da.Fill(ds);
                     }
                 }
+                connection.Close();
             }
             return ds;
         }
@@ -164,6 +174,7 @@ namespace ZeroLevel.SqlServer
                         da.Fill(ds);
                     }
                 }
+                connection.Close();
             }
             return ds;
         }
@@ -173,23 +184,37 @@ namespace ZeroLevel.SqlServer
         public object ExecuteScalar(string query)
         {
             using (var connection = _factory.CreateConnection())
+            {
+                try
                 {
                     using (var cmd = CreateCommand(connection, query, null, Timeout))
                     {
                         return cmd.ExecuteScalar();
                     }
                 }
+                finally
+                {
+                    connection.Close();
+                }
+            }
         }
 
         public object ExecuteScalar(string query, DbParameter[] par)
         {
             using (var connection = _factory.CreateConnection())
+            {
+                try
                 {
                     using (var cmd = CreateCommand(connection, query, par, Timeout))
                     {
                         return cmd.ExecuteScalar();
                     }
                 }
+                finally
+                {
+                    connection.Close();
+                }
+            }
         }
         #endregion
 
@@ -197,6 +222,8 @@ namespace ZeroLevel.SqlServer
         public int ExecProcedure(string name)
         {
             using (var connection = _factory.CreateConnection())
+            {
+                try
                 {
                     using (var command = new SqlCommand(name, connection)
                     {
@@ -207,6 +234,11 @@ namespace ZeroLevel.SqlServer
                         return command.ExecuteNonQuery();
                     }
                 }
+                finally
+                {
+                    connection.Close();
+                }
+            }
         }
         #endregion
 
@@ -281,7 +313,7 @@ namespace ZeroLevel.SqlServer
             return new SqlParameter[0];
         }
 
-        private static SqlCommand CreateCommand(DbConnection connection, string query, DbParameter[] parameters, int timeout)
+        public static SqlCommand CreateCommand(DbConnection connection, string query, DbParameter[] parameters, int timeout)
         {
             var command = connection.CreateCommand();
             command.CommandText = query;