util/Schema.cs

@@ -0,0 +1,141 @@
+using System;
+using System.Text;
+
+using Microsoft.EntityFrameworkCore;
+using GZTW.Pecklist.Models;
+
+namespace GZTW.Pecklist.Util
+{
+    //Key generator controller
+    public static class Schema
+    {
+        private static PecklistContext ctx;
+
+        /////////////////////////////////////////////////////////////////
+        /////////// CHANGE THIS ON NEW SCHEMA UPDATE ////////////////////
+        public const int DESIRED_SCHEMA_LEVEL = 2;
+        /////////////////////////////////////////////////////////////////
+
+
+        static int startingSchema = -1;
+        static int currentSchema = -1;
+
+        //check and update schema
+        public static void CheckAndUpdate(PecklistContext context)
+        {
+            ctx = context;
+            bool AppSchemaExists = false;
+            //  var ld=context.ListData;
+
+            //update schema here?           
+            using (var command = ctx.Database.GetDbConnection().CreateCommand())
+            {
+                //first of all, do we have a schema table yet (v0?)
+                command.CommandText = "SELECT name FROM sqlite_master WHERE type='table' AND name='appschema';";
+                ctx.Database.OpenConnection();
+                using (var result = command.ExecuteReader())
+                {
+                    if (result.HasRows)
+                    {
+                        AppSchemaExists = true;
+                    }
+                    ctx.Database.CloseConnection();
+                }
+            }
+            //Create schema table (v1)
+            if (!AppSchemaExists)
+            {
+                //nope, no schema table, add it now and set to v1
+                using (var cmCreateappschema = ctx.Database.GetDbConnection().CreateCommand())
+                {
+                    context.Database.OpenConnection();
+                    //first of all, do we have a schema table yet (v0?)
+                    cmCreateappschema.CommandText = "CREATE TABLE appschema (id INTEGER PRIMARY KEY, schema INTEGER NOT NULL);";
+                    cmCreateappschema.ExecuteNonQuery();
+
+                    cmCreateappschema.CommandText = "insert into appschema (schema) values (1);";
+                    cmCreateappschema.ExecuteNonQuery();
+
+                    context.Database.CloseConnection();
+                    startingSchema = 1;
+                    currentSchema = 1;
+                }
+            }
+            else
+            {
+                //get current schema level
+                using (var cm = ctx.Database.GetDbConnection().CreateCommand())
+                {
+                    cm.CommandText = "SELECT schema FROM appschema WHERE id=1;";
+                    ctx.Database.OpenConnection();
+                    using (var result = cm.ExecuteReader())
+                    {
+                        if (result.HasRows)
+                        {
+                            result.Read();
+                            currentSchema = startingSchema = result.GetInt32(0);
+                            ctx.Database.CloseConnection();
+                        }
+                        else
+                        {
+                            ctx.Database.CloseConnection();
+                            throw new System.Exception("Pecklist->RfSchema->CheckAndUpdate: Error reading schema version");
+                        }
+                    }
+                }
+            }
+
+            //Bail early no update?
+            if (currentSchema == DESIRED_SCHEMA_LEVEL)
+                return;
+
+
+
+            //************* SCHEMA UPDATES ******************
+            //////////////////////////////////////////////////
+            //schema 2 import data from Foodoo
+            if (currentSchema < 2)
+            {
+                //empty out the listdata table
+                exec("delete from listdata");
+
+                //Trigger import of foodoo data 
+                Util.FoodooImporter.Import(ctx);
+
+                //open and read in the GZListServerBackup.bak file into a json object
+                //turn it into pecklist format
+                //write it into the db
+                //$profit$
+
+                currentSchema = 2;              
+                setSchemaLevel(currentSchema);
+            }
+
+            //*************************************************************************************
+
+
+        }//eofunction
+
+
+
+        private static void setSchemaLevel(int nCurrentSchema)
+        {
+            exec("UPDATE appschema SET schema=" + nCurrentSchema.ToString());
+        }
+
+        //execute command query
+        private static void exec(string q)
+        {
+            using (var cmCreateappschema = ctx.Database.GetDbConnection().CreateCommand())
+            {
+                ctx.Database.OpenConnection();
+                cmCreateappschema.CommandText = q;
+                cmCreateappschema.ExecuteNonQuery();
+                ctx.Database.CloseConnection();
+            }
+        }
+
+        //eoclass
+    }
+    //eons
+}