feat: 账户余额显示功能

src/budget/_account.py

@@ -16,6 +16,10 @@ class AccountTab(TabPage):
         self.accountComboBox = QComboBox()
         self.accountComboBox.currentIndexChanged.connect(self.onAccountIndexChanged)
 
+        self.accountBalanceLine = QLineEdit()
+        self.accountBalanceLine.setReadOnly(True)
+        # 默认宽度
+        self.accountBalanceLine.setFixedWidth(150)
         self.accountModifyButton = QPushButton('Modify')
         self.accountAddButton = QPushButton('Add')
         self.accountModifyButton.clicked.connect(self.onAccountModifyClicked)
@@ -24,6 +28,7 @@ class AccountTab(TabPage):
         # 创建控件布局
         topLayout = QHBoxLayout()
         topLayout.addWidget(self.accountComboBox)
+        topLayout.addWidget(self.accountBalanceLine)
         topLayout.addWidget(self.accountModifyButton)
         topLayout.addWidget(self.accountAddButton)
 
@@ -220,11 +225,14 @@ class AccountTab(TabPage):
                          meta->>'description' FROM transaction \
                         WHERE a_id = %s ORDER BY time DESC", (a_id,))
         self.transData = self.pg.fetchall()
-        self.pg.execute("SELECT a_id, meta ->> 'name' FROM account ORDER BY a_id")
+        self.pg.execute("SELECT a_id, meta ->> 'name', balance FROM account ORDER BY a_id")
         self.accountData = self.pg.fetchall()
         self.pg.execute("SELECT c_id, meta ->> 'name' FROM category ORDER BY c_id")
         self.categoryData = self.pg.fetchall()
 
+        # 设置余额
+        self.accountBalanceLine.setText(str(self.accountData[index][2]))
+
         # 初始化表格
         self.accountTable.clear()
         self.accountTable.setRowCount(len(self.transData))