reorganize files for Qt application

qt/database/__init__.py

@@ -0,0 +1,100 @@
+import mariadb
+from sqlalchemy import create_engine, select, text, MetaData, join
+from sqlalchemy.orm import DeclarativeBase, relationship, sessionmaker
+
+from database.base import Base
+from database.comic import Comic
+from database.metadata import MetaDataTable, MetaDataColumn
+
+
+class KontorDB:
+
+    def __init__(self, db_config):
+        self.db_conn = mariadb.connect(
+            host=db_config['mariadb']['host'],
+            port=db_config['mariadb']['port'],
+            user=db_config['mariadb']['user'],
+            password=db_config['mariadb']['password'],
+            database=db_config['mariadb']['database']
+        )
+        connect_string = ('mariadb+mariadbconnector://{}:{}@{}:{}/{}'
+        .format(
+            db_config['mariadb']['user'],
+            db_config['mariadb']['password'],
+            db_config['mariadb']['host'],
+            db_config['mariadb']['port'],
+            db_config['mariadb']['database']))
+        # engine = create_engine(connect_string, echo=True)
+        engine = create_engine(connect_string)
+        Base.metadata.create_all(bind=engine)
+        __session__ = sessionmaker(bind=engine)
+        self.session = __session__()
+
+    def get_table_id(self, table_name):
+        result = self.session.execute(select(MetaDataTable.id).where(MetaDataTable.table_name == table_name)).scalar()
+        return result
+
+    def get_table_names(self) -> list:
+        tables = self.session.query(MetaDataTable).all()
+        result = [table.table_name for table in tables]
+        return result
+
+    def get_column_meta_data(self, table_id: str, table_name: str) -> dict:
+        meta_data = {}
+        order = 0
+        for (_, column) in self.session.query(MetaDataTable, MetaDataColumn).filter(MetaDataTable.id == MetaDataColumn.table_id).filter(MetaDataTable.table_name == table_name).filter(MetaDataColumn.is_shown == 1).all():
+            meta_data[order] = {'column': column.column_name, 'label': column.column_label, 'order': column.column_order}
+            order += 1
+        return meta_data
+
+    def get_filters(self, table_id):
+        cursor = self.db_conn.cursor()
+        filters = {}
+        cursor.execute(
+            "SELECT column_name, filter_label from meta_data_column WHERE table_id=? AND show_filter is true",
+            (table_id,))
+        rows = cursor.fetchall()
+        for row in rows:
+            filters[row[0]] = {'label': row[1], 'widget': None}
+        cursor.close()
+        # print(f"retrieved {len(rows)} filters: {filters}")
+        return filters
+
+    def get_data(self, table_name: str, columns: dict, where_clause: str) -> list:
+        data = []
+        cursor = self.db_conn.cursor()
+        cursor.execute(self.get_statement(table_name, columns, where_clause))
+        rows = cursor.fetchall()
+        print(len(rows))
+        for row in rows:
+            # print(f"KontorDB.get_data: {row}")
+            data.append(list(row))
+        cursor.close()
+        print(f"KontorDB.getData: return {len(data)}")
+        if table_name == 'comic' and len(where_clause) == 0:
+            data.clear()
+            comics = self.session.query(Comic).all()
+            for item in comics:
+                # print(item)
+                row = []
+                for order in columns.keys():
+                    column_name = columns[order]['column']
+                    if column_name == 'publisher_id':
+                        row.append(item.publisher.name)
+                    else:
+                        row.append(getattr(item, column_name))
+                # print(repr(row))
+                data.append(row)
+        return data
+
+    def get_statement(self, table: str, header: dict, where_clause):
+        columns = ""
+        for index, column in header.items():
+            if index > 0:
+                columns += ", "
+            columns += column['column']
+        if len(columns) == 0:
+            columns = "*"
+        statement = f"SELECT {columns} FROM {table} {where_clause}"
+        print(f"{statement=}")
+        return statement