From 67a471a49d3e09d56400d6adf74c13af4c99aa7d Mon Sep 17 00:00:00 2001
From: SGCMarkus <markusornik@gmail.com>
Date: Mon, 4 Mar 2024 11:33:05 +0100
Subject: [PATCH] astrodatagui: add StarsDB.py

this class can only be instanciated once!
---
 astrodatagui/db/StarsDB.py  | 40 +++++++++++++++++++++++++++++++++++++
 astrodatagui/db/__init__.py |  0
 2 files changed, 40 insertions(+)
 create mode 100644 astrodatagui/db/StarsDB.py
 create mode 100644 astrodatagui/db/__init__.py

diff --git a/astrodatagui/db/StarsDB.py b/astrodatagui/db/StarsDB.py
new file mode 100644
index 0000000..5dcfb66
--- /dev/null
+++ b/astrodatagui/db/StarsDB.py
@@ -0,0 +1,40 @@
+from enum import Enum
+import sqlite3
+
+class StarDBError(Enum):
+    NO_ERROR = 0
+    DB_CONNECTION_FAILED = 1
+    
+DB_NAME = "stars.db"
+
+class StarDB():
+    __instanceVar = None
+    
+    @staticmethod
+    def getInstance():
+        if(StarDB.__instanceVar == None):
+            return StarDB()
+        else:
+            return StarDB.__instanceVar
+        
+    def __init__(self):
+        if(StarDB.__instanceVar != None):
+            raise Exception("StarDB cannot be instantiated more than once!")
+        else:
+            StarDB.__instanceVar = self
+
+        self.error = StarDBError.NO_ERROR
+
+        try:
+            con = sqlite3.connect(DB_NAME)
+            self.dbCursor = con.cursor()
+        except:
+            self.error = StarDBError.DB_CONNECTION_FAILED
+            
+        if(self.error is not StarDBError.NO_ERROR):
+            raise Exception("StarDB cannot connect to the database!")
+        else:
+            self.initializeDB()
+
+    def initializeDB(self):
+        return
\ No newline at end of file
diff --git a/astrodatagui/db/__init__.py b/astrodatagui/db/__init__.py
new file mode 100644
index 0000000..e69de29