添加 MySQL Dao

dao/Database.py

@@ -0,0 +1,52 @@
+import pymysql.cursors
+from data_model import MysqlConfig
+
+class Database:
+    def __init__(self, config: MysqlConfig):
+        self.config = config
+        self.connection = None
+
+    def connect(self):
+        if not self.connection or not self.connection.open:
+            self.connection = pymysql.connect(
+                host=self.config.host,
+                user=self.config.user,
+                password=self.config.password,
+                database=self.config.db_name,
+                port=self.config.port,
+                cursorclass=pymysql.cursors.DictCursor
+            )
+        return self.connection
+
+    def close(self):
+        if self.connection and self.connection.open:
+            self.connection.close()
+
+    def execute(self, query, args=None):
+        connection = self.connect()
+        try:
+            with connection.cursor() as cursor:
+                cursor.execute(query, args)
+            connection.commit()
+        finally:
+            self.close()
+
+    def fetchone(self, query, args=None):
+        connection = self.connect()
+        try:
+            with connection.cursor() as cursor:
+                cursor.execute(query, args)
+                result = cursor.fetchone()
+            return result
+        finally:
+            self.close()
+
+    def fetchall(self, query, args=None):
+        connection = self.connect()
+        try:
+            with connection.cursor() as cursor:
+                cursor.execute(query, args)
+                results = cursor.fetchall()
+            return results
+        finally:
+            self.close()