From e030ecd76518546fbb0a4858cfaeab7c65175288 Mon Sep 17 00:00:00 2001
From: "Valeriano A.R" <valen.alfonso@gmail.com>
Date: Mon, 7 Oct 2019 11:07:35 +0200
Subject: [PATCH] DatabaseBL.Database_ExportData: Split data files.

---
 .../Code/BusinessLogic/DatabaseBL.cs          | 27 ++++++++++++++++++-
 VAR.DatabaseExplorer/UI/FrmBaseDatos.cs       |  3 ++-
 2 files changed, 28 insertions(+), 2 deletions(-)

diff --git a/VAR.DatabaseExplorer/Code/BusinessLogic/DatabaseBL.cs b/VAR.DatabaseExplorer/Code/BusinessLogic/DatabaseBL.cs
index 651e18d..406e719 100644
--- a/VAR.DatabaseExplorer/Code/BusinessLogic/DatabaseBL.cs
+++ b/VAR.DatabaseExplorer/Code/BusinessLogic/DatabaseBL.cs
@@ -67,6 +67,10 @@ namespace VAR.DatabaseExplorer.Code.BusinessLogic
 
         public static void Database_ExportData(TextWriter txtWriter, string connectionString, Database database)
         {
+            const int OneMegaByte = 1 * 1024 * 1024;
+            const int MaxSizePerBatch = OneMegaByte;
+            const int MaxSizePerFile = OneMegaByte * 32;
+
             // Preparar cabecera del script
             txtWriter.WriteLine("SET NOCOUNT ON;");
             txtWriter.WriteLine(string.Empty);
@@ -84,9 +88,30 @@ namespace VAR.DatabaseExplorer.Code.BusinessLogic
             txtWriter.WriteLine(string.Empty);
 
             // Prepara información a exportar
+            long batchLength = 0;
+            long fileLength = 0;
             foreach (Table table in database.Tables)
             {
-                TableBL.Table_ExportData(table, txtWriter, connectionString);
+                TableBL.Table_ExportData(table, txtWriter, connectionString, (lenght) =>
+                {
+                    batchLength += lenght;
+                    fileLength += lenght;
+
+                    if (batchLength > MaxSizePerBatch)
+                    {
+                        txtWriter.WriteLine("PRINT '...';");
+                        txtWriter.WriteLine("GO");
+                        batchLength = 0;
+                    }
+                    if (fileLength > MaxSizePerFile)
+                    {
+                        txtWriter.WriteLine("PRINT '...';");
+                        txtWriter.WriteLine("GO");
+                        SplittingStreamWriter.Split(txtWriter);
+                        fileLength = 0;
+                        batchLength = 0;
+                    }
+                });
             }
 
             // Activar todas las FKs
diff --git a/VAR.DatabaseExplorer/UI/FrmBaseDatos.cs b/VAR.DatabaseExplorer/UI/FrmBaseDatos.cs
index 4ea4ad5..1d86fab 100644
--- a/VAR.DatabaseExplorer/UI/FrmBaseDatos.cs
+++ b/VAR.DatabaseExplorer/UI/FrmBaseDatos.cs
@@ -2,6 +2,7 @@
 using System.Collections.Generic;
 using System.IO;
 using System.Windows.Forms;
+using VAR.DatabaseExplorer.Code;
 using VAR.DatabaseExplorer.Code.BusinessLogic;
 using VAR.DatabaseExplorer.Code.DataAccess;
 using VAR.DatabaseExplorer.Code.DataTransfer;
@@ -116,7 +117,7 @@ namespace VAR.DatabaseExplorer.UI
 
             Database database = DatabaseBL.Database_GetSchema(connectionString: _connectionString, fillTableDefinitions: true);
             string fixedDatabaseName = database.Name.Replace(' ', '_');
-            var streamWriter = new StreamWriter("05." + fixedDatabaseName + ".Data.sql");
+            var streamWriter = new SplittingStreamWriter("05." + fixedDatabaseName + ".{0:000}.Data.sql");
             DatabaseBL.Database_ExportData(streamWriter, _connectionString, database);
             streamWriter.Close();