astrodatagui: StarsDB: improve database structure

main/astrodatagui/db/StarsDB.py

@@ -21,6 +21,7 @@ class StarDB():
             instance = StarDB(dbName)
             StarDB.__instances.append(instance)
             StarDB.__dbNames.append(dbName)
+            return instance
         
     def __init__(self, dbName: str):
         if(dbName in StarDB.__dbNames):
@@ -59,28 +60,19 @@ class StarDB():
 
         self.dbCursor.execute("""CREATE TABLE IF NOT EXISTS sequenceSourceNames
          (
-           sequenceSourceNameID INTEGER NOT NULL,
-           name TEXT UNIQUE,
-           PRIMARY KEY (sequenceSourceNameID, name)
-         );""")
-
-        self.dbCursor.execute("""CREATE TABLE IF NOT EXISTS sequences
-         (
-           sequencesID INTEGER NOT NULL,
-           sequence INTEGER NOT NULL,
-           PRIMARY KEY (sequencesID, sequence)
+           sourceName TEXT,
+           PRIMARY KEY (sourceName)
          );""")
 
         self.dbCursor.execute("""CREATE TABLE IF NOT EXISTS stars
          (
            mainName TEXT NOT NULL,
-           sequenceSourceNameID INTEGER NOT NULL,
-           sequencesID INTEGER NOT NULL,
-           filename TEXT,
-           PRIMARY KEY (mainName, sequenceSourceNameID, sequencesID),
+           sourceName TEXT NOT NULL,
+           sequence INTEGER NOT NULL,
+           filename TEXT NOT NULL,
+           PRIMARY KEY (mainName, sourceName, sequence),
            FOREIGN KEY (mainName) REFERENCES starnames(mainName),
-           FOREIGN KEY (sequenceSourceNameID) REFERENCES sequenceSourceNames(sequenceSourceNameID)
-           FOREIGN KEY (sequencesID) REFERENCES sequences(sequencesID)
+           FOREIGN KEY (sourceName) REFERENCES sequenceSourceNames(sourceName)
          );""")
 
         self.insertDefaultValues()
@@ -89,10 +81,10 @@ class StarDB():
 
     def insertDefaultValues(self):
         sources = ["TESS", "Kepler", "K2"]
-        for i, s in enumerate(sources):
+        for s in sources:
             self.dbCursor.execute(f"""INSERT OR IGNORE INTO
-            sequenceSourceNames(sequenceSourceNameID, name)
-            VALUES({i}, \"{s}\")""")
+            sequenceSourceNames(sourceName)
+            VALUES(\"{s}\")""")
 
     def insertStarAlternativeNames(self, mainName: str, altNames):
         for an in altNames: