feat: added capability of creating/updating the database schema

gaseous-signature-ingestor/Program.cs

@@ -53,6 +53,8 @@ if (!Directory.Exists(Config.ConfigurationPath))
 
 // connect to database
 Database db = new gaseous_tools.Database(Database.databaseType.MySql, Config.DatabaseConfiguration.ConnectionString);
+// initialise the db
+db.InitDB();
 
 // process provided files
 Console.WriteLine("Processing input files:");

gaseous-tools/Database.cs

@@ -2,6 +2,7 @@
 using System.Data;
 using System.Data.SqlClient;
 using System.Diagnostics;
+using System.Reflection;
 using MySql.Data.MySqlClient;
 
 namespace gaseous_tools
@@ -52,13 +53,84 @@ namespace gaseous_tools
 			}
 		}
 
+		public void InitDB()
+		{
+            // load resources
+            var assembly = Assembly.GetExecutingAssembly();
 
-        public DataTable ExecuteCMD(string Command, Dictionary<string, object> Parameters, int Timeout = 30)
-        {
             switch (_ConnectorType)
 			{
 				case databaseType.MySql:
-                    MySQLServerConnector conn = new MySQLServerConnector(_ConnectionString);
+					// check if the database exists first - first run must have permissions to create a database
+					string sql = "CREATE DATABASE IF NOT EXISTS `" + Config.DatabaseConfiguration.DatabaseName + "`;";
+					Dictionary<string, object> dbDict = new Dictionary<string, object>();
+					ExecuteCMD(sql, dbDict, 30, "server=" + Config.DatabaseConfiguration.HostName + ";port=" + Config.DatabaseConfiguration.Port + ";userid=" + Config.DatabaseConfiguration.UserName + ";password=" + Config.DatabaseConfiguration.Password);
+
+					// check if schema version table is in place - if not, create the schema version table
+					sql = "SELECT TABLE_SCHEMA, TABLE_NAME FROM information_schema.TABLES WHERE TABLE_SCHEMA = 'gaseous' AND TABLE_NAME = 'schema_version';";
+					DataTable SchemaVersionPresent = ExecuteCMD(sql, dbDict);
+					if (SchemaVersionPresent.Rows.Count == 0)
+					{
+						// no schema table present - create it
+						sql = "CREATE TABLE `schema_version` (`schema_version` INT NOT NULL, PRIMARY KEY (`schema_version`)); INSERT INTO `schema_version` (`schema_version`) VALUES (0);";
+						ExecuteCMD(sql, dbDict);
+					}
+
+                    for (int i = 1000; i < 10000; i++)
+					{
+						string resourceName = "gaseous_tools.Database.MySQL.gaseous-" + i + ".sql";
+						string dbScript = "";
+
+						try
+						{
+							using (Stream stream = assembly.GetManifestResourceStream(resourceName))
+							using (StreamReader reader = new StreamReader(stream))
+							{
+								dbScript = reader.ReadToEnd();
+
+								// apply script
+								sql = "SELECT schema_version FROM schema_version;";
+								DataTable SchemaVersion = ExecuteCMD(sql, dbDict);
+								if (SchemaVersion.Rows.Count == 0)
+								{
+									// something is broken here... where's the table?
+									throw new Exception("schema_version table is missing!");
+								}
+								else
+								{
+									int SchemaVer = (int)SchemaVersion.Rows[0][0];
+									if (SchemaVer < i)
+									{
+										// apply schema!
+										ExecuteCMD(dbScript, dbDict);
+
+										sql = "UPDATE schema_version SET schema_version=@schemaver";
+										dbDict.Add("schemaver", i);
+										ExecuteCMD(sql, dbDict);
+									}
+									if (SchemaVer == i)
+									{
+										// no more updates, no point looping anymore
+										break;
+									}
+								}
+							}
+						} catch
+						{
+							break;
+						}
+                    }
+					break;
+			}
+		}
+
+        public DataTable ExecuteCMD(string Command, Dictionary<string, object> Parameters, int Timeout = 30, string ConnectionString = "")
+        {
+			if (ConnectionString == "") { ConnectionString = _ConnectionString; }
+            switch (_ConnectorType)
+			{
+				case databaseType.MySql:
+                    MySQLServerConnector conn = new MySQLServerConnector(ConnectionString);
 					return (DataTable)conn.ExecCMD(Command, Parameters, Timeout);
 				default:
 					return new DataTable();

gaseous-tools/gaseous-tools.csproj

@@ -14,9 +14,13 @@
   <ItemGroup>
     <None Remove="Database\" />
     <None Remove="Database\MySQL\" />
+    <None Remove="Database\MySQL\gaseous-1000.sql" />
   </ItemGroup>
   <ItemGroup>
     <Folder Include="Database\" />
     <Folder Include="Database\MySQL\" />
   </ItemGroup>
+  <ItemGroup>
+    <EmbeddedResource Include="Database\MySQL\gaseous-1000.sql" />
+  </ItemGroup>
 </Project>