diff --git a/main.cpp b/main.cpp
index b29f211..de1d42f 100644
--- a/main.cpp
+++ b/main.cpp
@@ -20,9 +20,10 @@ int main(int argc, char *argv[])
     QCoreApplication::addLibraryPath(basePath);
     QCoreApplication::addLibraryPath(basePath + "/sqldrivers");
     
-    ConfigManager::instance()->loadConfig(basePath);
+    // 配置文件位于 程序目录/config/config.ini（loadConfig 内部使用 appConfigDir()）
+    ConfigManager::instance()->loadConfig();
     
     MainWindow w;
-    w.show();
+    w.showMaximized();
     return a.exec();
 }
\ No newline at end of file
diff --git a/src/connectors/DatabaseConnector.h b/src/connectors/DatabaseConnector.h
index fc5b817..1754c5a 100644
--- a/src/connectors/DatabaseConnector.h
+++ b/src/connectors/DatabaseConnector.h
@@ -5,6 +5,7 @@
 #include <QSqlDatabase>
 #include <QSqlQuery>
 #include <QSettings>
+#include "utils/configmanager.h"
 
 // 连接参数结构体
 struct ConnectionParams {
@@ -18,15 +19,15 @@ struct ConnectionParams {
     // 从 QSettings group 加载
     static ConnectionParams fromSettings(const QString& connectionKey) {
         ConnectionParams p;
-        QSettings settings("Omnitool", "DatabaseConnections");
-        settings.beginGroup(connectionKey);
-        p.dbType   = settings.value("dbType", "MySQL").toString();
-        p.host     = settings.value("host").toString();
-        p.port     = settings.value("port").toString();
-        p.database = settings.value("database").toString();
-        p.username = settings.value("username").toString();
-        p.password = settings.value("password").toString();
-        settings.endGroup();
+        QSettings* settings = appConnectionsSettings();
+        settings->beginGroup(connectionKey);
+        p.dbType   = settings->value("dbType", "MySQL").toString();
+        p.host     = settings->value("host").toString();
+        p.port     = settings->value("port").toString();
+        p.database = settings->value("database").toString();
+        p.username = settings->value("username").toString();
+        p.password = settings->value("password").toString();
+        settings->endGroup();
         return p;
     }
 };
diff --git a/src/dialogs/DatabaseConnectionConfigDialog.cpp b/src/dialogs/DatabaseConnectionConfigDialog.cpp
index cb3a713..37f3e47 100644
--- a/src/dialogs/DatabaseConnectionConfigDialog.cpp
+++ b/src/dialogs/DatabaseConnectionConfigDialog.cpp
@@ -9,11 +9,14 @@
 #include <QHBoxLayout>
 #include <QVBoxLayout>
 #include <QHeaderView>
+#include <QShowEvent>
 #include <QSettings>
 #include <QMessageBox>
 #include <QLabel>
 #include <QDateTime>
+#include <QDir>
 #include "utils/logmanager.h"
+#include "utils/configmanager.h"
 DatabaseConnectionConfigDialog::DatabaseConnectionConfigDialog(QWidget* parent)
     : QDialog(parent)
 {
@@ -121,7 +124,7 @@ void DatabaseConnectionConfigDialog::loadConnections()
 {
     _connectionTable->setRowCount(0);
 
-    QSettings settings("Omnitool", "DatabaseConnections");
+    QSettings settings(QDir(appConfigDir()).filePath("config.ini"), QSettings::IniFormat);
     QStringList groups = settings.childGroups();
 
     for (const QString& group : groups) {
@@ -231,13 +234,34 @@ void DatabaseConnectionConfigDialog::loadConnections()
         
         _connectionTable->setCellWidget(0, 0, emptyWidget);
     }
+
+    resizeTableColumns();
+}
+
+void DatabaseConnectionConfigDialog::resizeTableColumns()
+{
+    if (!_connectionTable) return;
+    // 控件布局完成后重新计算，确保 "默认"、"操作" 列自适应内容宽度
+    _connectionTable->resizeColumnsToContents();
+    // 为按钮列预留最小宽度，避免被压缩或计算为 0
+    if (_connectionTable->columnCount() > 3)
+        _connectionTable->setColumnWidth(3, qMax(_connectionTable->columnWidth(3), 70));
+    if (_connectionTable->columnCount() > 4)
+        _connectionTable->setColumnWidth(4, qMax(_connectionTable->columnWidth(4), 160));
+}
+
+void DatabaseConnectionConfigDialog::showEvent(QShowEvent* event)
+{
+    QDialog::showEvent(event);
+    // 首次显示后控件几何已完成，重新自适应列宽
+    resizeTableColumns();
 }
 
 void DatabaseConnectionConfigDialog::addConnection()
 {
     ElaDatabaseConnectionDialog dialog(this);
     if (dialog.exec() == QDialog::Accepted) {
-        QSettings settings("Omnitool", "DatabaseConnections");
+        QSettings settings(QDir(appConfigDir()).filePath("config.ini"), QSettings::IniFormat);
         QString key = "connection_" + QString::number(QDateTime::currentMSecsSinceEpoch());
 
         settings.beginGroup(key);
@@ -245,7 +269,8 @@ void DatabaseConnectionConfigDialog::addConnection()
         settings.setValue("dbType", dialog.getDatabaseType());
         settings.setValue("host", dialog.getHostName());
         settings.setValue("port", dialog.getPort());
-        settings.setValue("database", dialog.getDatabaseName());
+        // SQLite 类型为文件路径
+        settings.setValue("database", dialog.getDatabaseType() == "SQLite" ? dialog.getDatabaseFileName() : dialog.getDatabaseName());
         settings.setValue("username", dialog.getUserName());
         settings.setValue("password", dialog.getPassword());
         settings.endGroup();
@@ -266,7 +291,7 @@ void DatabaseConnectionConfigDialog::editConnection(int row)
         return;
     }
 
-    QSettings settings("Omnitool", "DatabaseConnections");
+    QSettings settings(QDir(appConfigDir()).filePath("config.ini"), QSettings::IniFormat);
     settings.beginGroup(key);
     QString dbType = settings.value("dbType", "MySQL").toString();
     QString connectionName = settings.value("name", key).toString();
@@ -282,7 +307,11 @@ void DatabaseConnectionConfigDialog::editConnection(int row)
     dialog.setConnectionName(connectionName);
     dialog.setHostName(host);
     dialog.setPort(port);
-    dialog.setDatabaseName(database);
+    if (dbType == "SQLite") {
+        dialog.setDatabaseFileName(database);
+    } else {
+        dialog.setDatabaseName(database);
+    }
     dialog.setUserName(username);
     dialog.setPassword(password);
 
@@ -292,7 +321,7 @@ void DatabaseConnectionConfigDialog::editConnection(int row)
         settings.setValue("dbType", dialog.getDatabaseType());
         settings.setValue("host", dialog.getHostName());
         settings.setValue("port", dialog.getPort());
-        settings.setValue("database", dialog.getDatabaseName());
+        settings.setValue("database", dialog.getDatabaseType() == "SQLite" ? dialog.getDatabaseFileName() : dialog.getDatabaseName());
         settings.setValue("username", dialog.getUserName());
         settings.setValue("password", dialog.getPassword());
         settings.endGroup();
@@ -312,7 +341,7 @@ void DatabaseConnectionConfigDialog::deleteConnection(int row)
     if (QMessageBox::question(this, "确认删除", "确定要删除此连接吗？", 
                              QMessageBox::Yes | QMessageBox::No) == QMessageBox::Yes) {
         if (!key.isEmpty()) {
-            QSettings settings("Omnitool", "DatabaseConnections");
+            QSettings settings(QDir(appConfigDir()).filePath("config.ini"), QSettings::IniFormat);
             settings.remove(key);
         }
 
@@ -348,7 +377,7 @@ void DatabaseConnectionConfigDialog::setDefault(int row)
         return;
     }
 
-    QSettings settings("Omnitool", "DatabaseConnections");
+    QSettings settings(QDir(appConfigDir()).filePath("config.ini"), QSettings::IniFormat);
     QStringList groups = settings.childGroups();
 
     for (const QString& group : groups) {
diff --git a/src/dialogs/DatabaseConnectionConfigDialog.h b/src/dialogs/DatabaseConnectionConfigDialog.h
index 27baca3..0169e6f 100644
--- a/src/dialogs/DatabaseConnectionConfigDialog.h
+++ b/src/dialogs/DatabaseConnectionConfigDialog.h
@@ -3,6 +3,7 @@
 
 #include <QDialog>
 #include <QTableWidget>
+#include <QShowEvent>
 
 class ElaLineEdit;
 class ElaPushButton;
@@ -18,6 +19,9 @@ public:
     
     QString getSelectedConnectionKey() const { return _selectedConnectionKey; }
 
+protected:
+    void showEvent(QShowEvent* event) override;
+
 private:
     QString _selectedConnectionKey;
     void initUI();
@@ -30,6 +34,7 @@ private:
     void setDefault(int row);
     void exportConfig();
     void importConfig();
+    void resizeTableColumns();
 
 private:
     ElaLineEdit* _searchEdit;
diff --git a/src/dialogs/ElaDatabaseConnectionDialog.cpp b/src/dialogs/ElaDatabaseConnectionDialog.cpp
index efc8faa..3a6fe19 100644
--- a/src/dialogs/ElaDatabaseConnectionDialog.cpp
+++ b/src/dialogs/ElaDatabaseConnectionDialog.cpp
@@ -2,11 +2,8 @@
 #include "ElaLineEdit.h"
 #include "ElaComboBox.h"
 #include "ElaPushButton.h"
-#include "ElaToolButton.h"
 #include "ElaText.h"
 #include "ElaMessageBar.h"
-#include "ElaIcon.h"
-#include "connectors/DatabaseConnector.h"
 #include <QVBoxLayout>
 #include <QHBoxLayout>
 #include <QGridLayout>
@@ -14,31 +11,37 @@
 #include <QSqlDatabase>
 #include <QSqlError>
 #include <QFileDialog>
-#include <QDir>
 
 ElaDatabaseConnectionDialog::ElaDatabaseConnectionDialog(QWidget* parent)
     : QDialog(parent)
 {
     setWindowTitle("数据库连接");
-    setMinimumWidth(500);
+    // 固定宽度，高度随显示的控件数量自适应
+    setFixedWidth(500);
     setWindowFlags(windowFlags() & ~Qt::WindowMinMaxButtonsHint);
 
     QVBoxLayout* mainLayout = new QVBoxLayout(this);
-    mainLayout->setContentsMargins(30, 30, 30, 30);
-    mainLayout->setSpacing(24);
+    mainLayout->setContentsMargins(30, 24, 30, 24);
+    mainLayout->setSpacing(10);
 
     ElaText* titleText = new ElaText("数据库连接配置");
     titleText->setTextStyle(ElaTextType::Body);
     titleText->setStyleSheet("font-size: 20px;");
+    titleText->setContentsMargins(0, 0, 0, 4);
+    titleText->setFixedHeight(28);
     mainLayout->addWidget(titleText, 0, Qt::AlignCenter);
 
     _formLayout = new QGridLayout();
-    _formLayout->setVerticalSpacing(12);
-    _formLayout->setHorizontalSpacing(15);
-    _formLayout->setColumnStretch(0, 1);
-    _formLayout->setColumnStretch(3, 1);
+    _formLayout->setVerticalSpacing(14);
+    _formLayout->setHorizontalSpacing(12);
+    // 标签列固定最小宽度（容纳"数据库文件""节点名称"），输入列伸展
+    _formLayout->setColumnStretch(1, 0);
+    _formLayout->setColumnStretch(2, 1);
+    _formLayout->setColumnMinimumWidth(1, 92);
+    // 先将布局挂到主布局（让 layout 有 parent），否则 addWidget 时 widget 不会跟随 dialog
+    mainLayout->addLayout(_formLayout);
 
-    // Row 0: 连接名称（所有类型都显示）
+    // ---- Row 0: 连接名称（所有类型都显示） ----
     _connectionNameLabel = new ElaText("连接名称");
     _connectionNameLabel->setStyleSheet("font-size: 13px;");
     _connectionNameLineEdit = new ElaLineEdit();
@@ -46,15 +49,15 @@ ElaDatabaseConnectionDialog::ElaDatabaseConnectionDialog(QWidget* parent)
     _formLayout->addWidget(_connectionNameLabel, 0, 1, Qt::AlignRight | Qt::AlignVCenter);
     _formLayout->addWidget(_connectionNameLineEdit, 0, 2);
 
-    // Row 1: 数据库类型
-    ElaText* dbTypeLabel = new ElaText("数据库类型");
-    dbTypeLabel->setStyleSheet("font-size: 13px;");
+    // ---- Row 1: 数据库类型（所有类型都显示） ----
+    _dbTypeLabel = new ElaText("数据库类型");
+    _dbTypeLabel->setStyleSheet("font-size: 13px;");
     _dbTypeComboBox = new ElaComboBox();
     _dbTypeComboBox->addItems({"MySQL", "SQLite", "Oracle", "MDB-SQL"});
-    _formLayout->addWidget(dbTypeLabel, 1, 1, Qt::AlignRight | Qt::AlignVCenter);
+    _formLayout->addWidget(_dbTypeLabel, 1, 1, Qt::AlignRight | Qt::AlignVCenter);
     _formLayout->addWidget(_dbTypeComboBox, 1, 2);
 
-    // Row 2: 主机地址
+    // ---- Row 2: 主机地址（MySQL/Oracle） ----
     _hostLabel = new ElaText("<font color='red'>*</font>主机地址");
     _hostLabel->setStyleSheet("font-size: 13px;");
     _hostLineEdit = new ElaLineEdit();
@@ -62,7 +65,7 @@ ElaDatabaseConnectionDialog::ElaDatabaseConnectionDialog(QWidget* parent)
     _formLayout->addWidget(_hostLabel, 2, 1, Qt::AlignRight | Qt::AlignVCenter);
     _formLayout->addWidget(_hostLineEdit, 2, 2);
 
-    // Row 3: 端口
+    // ---- Row 3: 端口（MySQL/Oracle） ----
     _portLabel = new ElaText("<font color='red'>*</font>端口");
     _portLabel->setStyleSheet("font-size: 13px;");
     _portLineEdit = new ElaLineEdit();
@@ -70,7 +73,7 @@ ElaDatabaseConnectionDialog::ElaDatabaseConnectionDialog(QWidget* parent)
     _formLayout->addWidget(_portLabel, 3, 1, Qt::AlignRight | Qt::AlignVCenter);
     _formLayout->addWidget(_portLineEdit, 3, 2);
 
-    // Row 4: 数据库名称
+    // ---- Row 4: 数据库名称（仅 MySQL） ----
     _databaseNameLabel = new ElaText("数据库名称");
     _databaseNameLabel->setStyleSheet("font-size: 13px;");
     _databaseNameLineEdit = new ElaLineEdit();
@@ -78,7 +81,26 @@ ElaDatabaseConnectionDialog::ElaDatabaseConnectionDialog(QWidget* parent)
     _formLayout->addWidget(_databaseNameLabel, 4, 1, Qt::AlignRight | Qt::AlignVCenter);
     _formLayout->addWidget(_databaseNameLineEdit, 4, 2);
 
-    // Row 5: 用户名
+    // ---- Row 4b: SQLite 数据库文件 + 浏览（仅 SQLite）----
+    // 用 column 0,1,2,3 而非 row 4 列 1,2,3，避免与 _databaseNameLabel 同行冲突
+    // 这里用一个独立行（row 4 但 col 1,2 已被占用 → 改用 row 4 整个行被 MySQL 占用）
+    // 改用 addWidget 时 row=4 同一行，但仅 SQLite 时隐藏 _databaseNameLabel
+    _dbFileLabel = new ElaText("数据库文件");
+    _dbFileLabel->setStyleSheet("font-size: 13px;");
+    _dbFileLineEdit = new ElaLineEdit();
+    _dbFileLineEdit->setPlaceholderText("请选择 .db / .sqlite 文件");
+    _browseButton = new ElaPushButton("浏览...");
+    _browseButton->setFixedWidth(80);
+    // SQLite 行使用 row 4，但与"数据库名称"（MySQL）使用同一行
+    // 切换时只显示对应类型那一行的 widget
+    // 注意：row 4 已被 _databaseNameLabel/_databaseNameLineEdit 占用
+    // SQLite 的 label/file 放到 row 4 column 1,2；browse 放到 row 4 column 3
+    // 切换时通过 hide()/show() 切换可见性
+    _formLayout->addWidget(_dbFileLabel, 4, 1, Qt::AlignRight | Qt::AlignVCenter);
+    _formLayout->addWidget(_dbFileLineEdit, 4, 2);
+    _formLayout->addWidget(_browseButton, 4, 3, Qt::AlignVCenter);
+
+    // ---- Row 5: 用户名（MySQL/Oracle） ----
     _userNameLabel = new ElaText("<font color='red'>*</font>用户名");
     _userNameLabel->setStyleSheet("font-size: 13px;");
     _userNameLineEdit = new ElaLineEdit();
@@ -86,7 +108,7 @@ ElaDatabaseConnectionDialog::ElaDatabaseConnectionDialog(QWidget* parent)
     _formLayout->addWidget(_userNameLabel, 5, 1, Qt::AlignRight | Qt::AlignVCenter);
     _formLayout->addWidget(_userNameLineEdit, 5, 2);
 
-    // Row 6: 密码
+    // ---- Row 6: 密码（MySQL/Oracle） ----
     _passwordLabel = new ElaText("<font color='red'>*</font>密码");
     _passwordLabel->setStyleSheet("font-size: 13px;");
     _passwordLineEdit = new ElaLineEdit();
@@ -95,7 +117,7 @@ ElaDatabaseConnectionDialog::ElaDatabaseConnectionDialog(QWidget* parent)
     _formLayout->addWidget(_passwordLabel, 6, 1, Qt::AlignRight | Qt::AlignVCenter);
     _formLayout->addWidget(_passwordLineEdit, 6, 2);
 
-    // Row 7: 服务名
+    // ---- Row 7: 服务名（仅 Oracle） ----
     _serviceNameLabel = new ElaText("<font color='red'>*</font>服务名");
     _serviceNameLabel->setStyleSheet("font-size: 13px;");
     _serviceNameLineEdit = new ElaLineEdit();
@@ -103,7 +125,7 @@ ElaDatabaseConnectionDialog::ElaDatabaseConnectionDialog(QWidget* parent)
     _formLayout->addWidget(_serviceNameLabel, 7, 1, Qt::AlignRight | Qt::AlignVCenter);
     _formLayout->addWidget(_serviceNameLineEdit, 7, 2);
 
-    // Row 8: 节点名称
+    // ---- Row 8: 节点名称（仅 MDB-SQL） ----
     _nodeNameLabel = new ElaText("<font color='red'>*</font>节点名称");
     _nodeNameLabel->setStyleSheet("font-size: 13px;");
     _nodeNameLineEdit = new ElaLineEdit();
@@ -111,7 +133,7 @@ ElaDatabaseConnectionDialog::ElaDatabaseConnectionDialog(QWidget* parent)
     _formLayout->addWidget(_nodeNameLabel, 8, 1, Qt::AlignRight | Qt::AlignVCenter);
     _formLayout->addWidget(_nodeNameLineEdit, 8, 2);
 
-    // Row 9: 许可证编号
+    // ---- Row 9: 许可证编号（仅 MDB-SQL） ----
     _licenseKeyLabel = new ElaText("许可证编号");
     _licenseKeyLabel->setStyleSheet("font-size: 13px;");
     _licenseKeyLineEdit = new ElaLineEdit();
@@ -119,19 +141,6 @@ ElaDatabaseConnectionDialog::ElaDatabaseConnectionDialog(QWidget* parent)
     _formLayout->addWidget(_licenseKeyLabel, 9, 1, Qt::AlignRight | Qt::AlignVCenter);
     _formLayout->addWidget(_licenseKeyLineEdit, 9, 2);
 
-    // Row 10: SQLite数据库文件路径
-    _sqliteFileLabel = new ElaText("<font color='red'>*</font>数据库文件");
-    _sqliteFileLabel->setStyleSheet("font-size: 13px;");
-    _sqliteFileLineEdit = new ElaLineEdit();
-    _sqliteFileLineEdit->setPlaceholderText("请选择或输入 SQLite 数据库文件路径");
-    _sqliteBrowseButton = new ElaToolButton(this);
-    _sqliteBrowseButton->setText("浏览...");
-    _formLayout->addWidget(_sqliteFileLabel, 10, 1, Qt::AlignRight | Qt::AlignVCenter);
-    _formLayout->addWidget(_sqliteFileLineEdit, 10, 2);
-    _formLayout->addWidget(_sqliteBrowseButton, 10, 3);
-
-    mainLayout->addLayout(_formLayout);
-
     QHBoxLayout* buttonLayout = new QHBoxLayout();
     buttonLayout->setSpacing(12);
 
@@ -147,10 +156,10 @@ ElaDatabaseConnectionDialog::ElaDatabaseConnectionDialog(QWidget* parent)
     mainLayout->addLayout(buttonLayout);
 
     connect(_dbTypeComboBox, &ElaComboBox::currentTextChanged, this, &ElaDatabaseConnectionDialog::onDbTypeChanged);
+    connect(_browseButton, &ElaPushButton::clicked, this, &ElaDatabaseConnectionDialog::onBrowseClicked);
     connect(_testButton, &ElaPushButton::clicked, this, &ElaDatabaseConnectionDialog::onTestConnectionClicked);
     connect(_okButton, &ElaPushButton::clicked, this, &ElaDatabaseConnectionDialog::onOkClicked);
     connect(_cancelButton, &ElaPushButton::clicked, this, &ElaDatabaseConnectionDialog::reject);
-    connect(_sqliteBrowseButton, &ElaToolButton::clicked, this, &ElaDatabaseConnectionDialog::onBrowseSqliteFile);
 
     connect(_hostLineEdit, &ElaLineEdit::textChanged, this, &ElaDatabaseConnectionDialog::onHostTextChanged);
     connect(_portLineEdit, &ElaLineEdit::textChanged, this, &ElaDatabaseConnectionDialog::onPortTextChanged);
@@ -158,8 +167,8 @@ ElaDatabaseConnectionDialog::ElaDatabaseConnectionDialog(QWidget* parent)
     connect(_serviceNameLineEdit, &ElaLineEdit::textChanged, this, &ElaDatabaseConnectionDialog::onServiceNameTextChanged);
     connect(_nodeNameLineEdit, &ElaLineEdit::textChanged, this, &ElaDatabaseConnectionDialog::onNodeNameTextChanged);
 
+    // 初始化可见性（不再清空 layout）
     updateFormFields();
-    adjustSize();
 }
 
 ElaDatabaseConnectionDialog::~ElaDatabaseConnectionDialog()
@@ -168,72 +177,62 @@ ElaDatabaseConnectionDialog::~ElaDatabaseConnectionDialog()
 
 void ElaDatabaseConnectionDialog::updateFormFields()
 {
+    // 不动 layout：通过 hide/show 切换可见性，避免 widget 漂移或丢失
+    // 所有 widget 已在构造函数中添加到 _formLayout 的固定 row/col，
+    // 此处仅按 dbType 控制每行 widget 的可见性。
     QString dbType = _dbTypeComboBox->currentText();
 
-    // 连接名称始终显示
-    _connectionNameLabel->show();
-    _connectionNameLineEdit->show();
+    // 共用：连接名称、数据库类型
+    _connectionNameLabel->setVisible(true);
+    _connectionNameLineEdit->setVisible(true);
+    _dbTypeLabel->setVisible(true);
+    _dbTypeComboBox->setVisible(true);
 
-    // 默认隐藏可选字段
-    _hostLabel->hide();
-    _hostLineEdit->hide();
-    _portLabel->hide();
-    _portLineEdit->hide();
-    _databaseNameLabel->hide();
-    _databaseNameLineEdit->hide();
-    _userNameLabel->hide();
-    _userNameLineEdit->hide();
-    _passwordLabel->hide();
-    _passwordLineEdit->hide();
-    _serviceNameLabel->hide();
-    _serviceNameLineEdit->hide();
-    _nodeNameLabel->hide();
-    _nodeNameLineEdit->hide();
-    _licenseKeyLabel->hide();
-    _licenseKeyLineEdit->hide();
-    _sqliteFileLabel->hide();
-    _sqliteFileLineEdit->hide();
-    _sqliteBrowseButton->hide();
+    // 默认全部隐藏
+    auto hideAll = [&]() {
+        _hostLabel->hide();      _hostLineEdit->hide();
+        _portLabel->hide();      _portLineEdit->hide();
+        _databaseNameLabel->hide(); _databaseNameLineEdit->hide();
+        _dbFileLabel->hide();    _dbFileLineEdit->hide();   _browseButton->hide();
+        _userNameLabel->hide();   _userNameLineEdit->hide();
+        _passwordLabel->hide();   _passwordLineEdit->hide();
+        _serviceNameLabel->hide(); _serviceNameLineEdit->hide();
+        _nodeNameLabel->hide();   _nodeNameLineEdit->hide();
+        _licenseKeyLabel->hide(); _licenseKeyLineEdit->hide();
+    };
 
-    if (dbType == "MDB-SQL") {
-        _nodeNameLabel->show();
-        _nodeNameLineEdit->show();
-        _licenseKeyLabel->show();
-        _licenseKeyLineEdit->show();
-    } else if (dbType == "Oracle") {
-        _hostLabel->show();
-        _hostLineEdit->show();
-        _portLabel->show();
-        _portLineEdit->show();
-        _userNameLabel->show();
-        _userNameLineEdit->show();
-        _passwordLabel->show();
-        _passwordLineEdit->show();
-        _serviceNameLabel->show();
-        _serviceNameLineEdit->show();
+    if (dbType == "SQLite") {
+        hideAll();
+        _dbFileLabel->show();     _dbFileLineEdit->show();   _browseButton->show();
     } else if (dbType == "MySQL") {
-        _hostLabel->show();
-        _hostLineEdit->show();
-        _portLabel->show();
-        _portLineEdit->show();
-        _databaseNameLabel->show();
-        _databaseNameLineEdit->show();
-        _userNameLabel->show();
-        _userNameLineEdit->show();
-        _passwordLabel->show();
-        _passwordLineEdit->show();
-    } else if (dbType == "SQLite") {
-        // SQLite 需要数据库文件路径
-        _sqliteFileLabel->show();
-        _sqliteFileLineEdit->show();
-        _sqliteBrowseButton->show();
+        hideAll();
+        _hostLabel->show();       _hostLineEdit->show();
+        _portLabel->show();       _portLineEdit->show();
+        _databaseNameLabel->show(); _databaseNameLineEdit->show();
+        _userNameLabel->show();   _userNameLineEdit->show();
+        _passwordLabel->show();   _passwordLineEdit->show();
+    } else if (dbType == "Oracle") {
+        hideAll();
+        _hostLabel->show();       _hostLineEdit->show();
+        _portLabel->show();       _portLineEdit->show();
+        _userNameLabel->show();   _userNameLineEdit->show();
+        _passwordLabel->show();   _passwordLineEdit->show();
+        _serviceNameLabel->show(); _serviceNameLineEdit->show();
+    } else if (dbType == "MDB-SQL") {
+        hideAll();
+        _nodeNameLabel->show();   _nodeNameLineEdit->show();
+        _licenseKeyLabel->show(); _licenseKeyLineEdit->show();
+    } else {
+        hideAll();
     }
+
+    // 窗口高度随显示的控件数量自适应（标题位置因固定在 VBoxLayout 顶部而不变）
+    adjustSize();
 }
 
 void ElaDatabaseConnectionDialog::onDbTypeChanged(const QString& /*type*/)
 {
     updateFormFields();
-    adjustSize();
 }
 
 void ElaDatabaseConnectionDialog::onHostTextChanged(const QString& text)
@@ -316,13 +315,6 @@ QString ElaDatabaseConnectionDialog::getConnectionName() const
 
 QString ElaDatabaseConnectionDialog::getDatabaseName() const
 {
-    if (_dbTypeComboBox->currentText() == "SQLite") {
-        return _sqliteFileLineEdit->text();
-    }
-    // Oracle 使用服务名作为 database 字段
-    if (_dbTypeComboBox->currentText() == "Oracle") {
-        return _serviceNameLineEdit->text();
-    }
     return _databaseNameLineEdit->text();
 }
 
@@ -351,6 +343,29 @@ QString ElaDatabaseConnectionDialog::getLicenseKey() const
     return _licenseKeyLineEdit->text();
 }
 
+QString ElaDatabaseConnectionDialog::getDatabaseFileName() const
+{
+    return _dbFileLineEdit->text();
+}
+
+void ElaDatabaseConnectionDialog::setDatabaseFileName(const QString& fileName)
+{
+    _dbFileLineEdit->setText(fileName);
+}
+
+void ElaDatabaseConnectionDialog::onBrowseClicked()
+{
+    QString fileName = QFileDialog::getOpenFileName(
+        this,
+        "选择 SQLite 数据库文件",
+        QString(),
+        "SQLite 数据库 (*.db *.sqlite *.db3 *.sqlite3);;所有文件 (*.*)");
+    if (!fileName.isEmpty()) {
+        _dbFileLineEdit->setText(fileName);
+        clearErrorStyle(_dbFileLineEdit);
+    }
+}
+
 void ElaDatabaseConnectionDialog::setDatabaseType(const QString& type)
 {
     int index = _dbTypeComboBox->findText(type);
@@ -377,13 +392,7 @@ void ElaDatabaseConnectionDialog::setConnectionName(const QString& name)
 
 void ElaDatabaseConnectionDialog::setDatabaseName(const QString& name)
 {
-    if (_dbTypeComboBox->currentText() == "SQLite") {
-        _sqliteFileLineEdit->setText(name);
-    } else if (_dbTypeComboBox->currentText() == "Oracle") {
-        _serviceNameLineEdit->setText(name);
-    } else {
-        _databaseNameLineEdit->setText(name);
-    }
+    _databaseNameLineEdit->setText(name);
 }
 
 void ElaDatabaseConnectionDialog::setUserName(const QString& userName)
@@ -416,22 +425,12 @@ void ElaDatabaseConnectionDialog::onTestConnectionClicked()
     QString dbType = _dbTypeComboBox->currentText();
     QString host = _hostLineEdit->text();
     QString port = _portLineEdit->text();
+    QString database = _databaseNameLineEdit->text();
     QString username = _userNameLineEdit->text();
     QString password = _passwordLineEdit->text();
-    QString sqliteFile = _sqliteFileLineEdit->text();
     bool hasError = false;
 
-    // 字段校验
-    if (dbType == "SQLite") {
-        if (sqliteFile.isEmpty()) {
-            setErrorStyle(_sqliteFileLineEdit);
-            hasError = true;
-        }
-        if (hasError) {
-            ElaMessageBar::warning(ElaMessageBarType::Top, "警告", "请选择 SQLite 数据库文件", 3000, this);
-            return;
-        }
-    } else {
+    if (dbType != "SQLite") {
         if (host.isEmpty()) {
             setErrorStyle(_hostLineEdit);
             hasError = true;
@@ -440,73 +439,90 @@ void ElaDatabaseConnectionDialog::onTestConnectionClicked()
             setErrorStyle(_portLineEdit);
             hasError = true;
         }
-        if ((dbType == "MySQL" || dbType == "Oracle") && password.isEmpty()) {
+    }
+
+    if (dbType == "MySQL" && password.isEmpty()) {
+        setErrorStyle(_passwordLineEdit);
+        hasError = true;
+    }
+
+    if (dbType == "Oracle") {
+        if (username.isEmpty()) {
+            setErrorStyle(_userNameLineEdit);
+            hasError = true;
+        }
+        if (password.isEmpty()) {
             setErrorStyle(_passwordLineEdit);
             hasError = true;
         }
-        if (dbType == "Oracle") {
-            if (username.isEmpty()) {
-                setErrorStyle(_userNameLineEdit);
-                hasError = true;
-            }
-            if (_serviceNameLineEdit->text().isEmpty()) {
-                setErrorStyle(_serviceNameLineEdit);
-                hasError = true;
-            }
-        }
-        if (dbType == "MDB-SQL") {
-            if (_nodeNameLineEdit->text().isEmpty()) {
-                setErrorStyle(_nodeNameLineEdit);
-                hasError = true;
-            }
-        }
-        if (hasError) {
-            ElaMessageBar::warning(ElaMessageBarType::Top, "警告", "请填写所有必填项", 3000, this);
-            return;
+        if (_serviceNameLineEdit->text().isEmpty()) {
+            setErrorStyle(_serviceNameLineEdit);
+            hasError = true;
         }
     }
 
-    // 构造 ConnectionParams，复用 createConnector() 使测试连接与实际连接使用完全相同逻辑
-    ConnectionParams params;
-    params.dbType   = dbType;
-    params.host     = host;
-    params.port     = port;
-    params.database = getDatabaseName();  // Oracle 返回服务名，SQLite 返回文件路径
-    params.username = username;
-    params.password = password;
+    if (dbType == "MDB-SQL") {
+        if (_nodeNameLineEdit->text().isEmpty()) {
+            setErrorStyle(_nodeNameLineEdit);
+            hasError = true;
+        }
+    }
 
-    DatabaseConnector* connector = createConnector(params, "test_connection");
-    if (!connector) {
-        ElaMessageBar::error(ElaMessageBarType::Top, "错误", "不支持的数据库类型: " + dbType, 3000, this);
+    if (hasError) {
+        ElaMessageBar::warning(ElaMessageBarType::Top, "警告", "请填写所有必填项", 3000, this);
         return;
     }
 
-    if (connector->open()) {
-        ElaMessageBar::success(ElaMessageBarType::Top, "成功", "连接测试成功", 3000, this);
-        connector->close();
-    } else {
-        ElaMessageBar::error(ElaMessageBarType::Top, "错误", "无法连接数据库: " + connector->database().lastError().text(), 5000, this);
+    QString driverName;
+    if (dbType == "MySQL") {
+        driverName = "QMYSQL";
+    } else if (dbType == "SQLite") {
+        driverName = "QSQLITE";
+    } else if (dbType == "Oracle") {
+        driverName = "QOCI";
     }
 
-    delete connector;
+    QString connectionName = "test_connection";
+    if (QSqlDatabase::contains(connectionName)) {
+        QSqlDatabase::removeDatabase(connectionName);
+    }
+
+    QSqlDatabase db = QSqlDatabase::addDatabase(driverName, connectionName);
+
+    if (dbType == "SQLite") {
+        if (_dbFileLineEdit->text().isEmpty()) {
+            ElaMessageBar::warning(ElaMessageBarType::Top, "警告", "请选择 SQLite 数据库文件", 3000, this);
+            return;
+        }
+        db.setDatabaseName(_dbFileLineEdit->text());
+    } else {
+        db.setHostName(host);
+        db.setPort(port.toInt());
+        db.setDatabaseName(database);
+        db.setUserName(username);
+        db.setPassword(password);
+    }
+
+    if (db.open()) {
+        ElaMessageBar::success(ElaMessageBarType::Top, "成功", "连接测试成功", 3000, this);
+        db.close();
+    } else {
+        ElaMessageBar::error(ElaMessageBarType::Top, "错误", "无法连接数据库: " + db.lastError().text(), 5000, this);
+    }
+    
+    QSqlDatabase::removeDatabase(connectionName);
 }
 
 void ElaDatabaseConnectionDialog::onOkClicked()
 {
     QString dbType = _dbTypeComboBox->currentText();
-    QString sqliteFile = _sqliteFileLineEdit->text();
     bool hasError = false;
 
-    // SQLite 特殊处理
     if (dbType == "SQLite") {
-        if (sqliteFile.isEmpty()) {
-            setErrorStyle(_sqliteFileLineEdit);
+        if (_dbFileLineEdit->text().isEmpty()) {
+            setErrorStyle(_dbFileLineEdit);
             hasError = true;
         }
-        if (hasError) {
-            ElaMessageBar::warning(ElaMessageBarType::Top, "警告", "请选择 SQLite 数据库文件", 3000, this);
-            return;
-        }
     } else {
         if (_hostLineEdit->text().isEmpty()) {
             setErrorStyle(_hostLineEdit);
@@ -517,52 +533,39 @@ void ElaDatabaseConnectionDialog::onOkClicked()
             setErrorStyle(_portLineEdit);
             hasError = true;
         }
+    }
 
-        if (dbType == "MySQL" && _passwordLineEdit->text().isEmpty()) {
+    if (dbType == "MySQL" && _passwordLineEdit->text().isEmpty()) {
+        setErrorStyle(_passwordLineEdit);
+        hasError = true;
+    }
+
+    if (dbType == "Oracle") {
+        if (_userNameLineEdit->text().isEmpty()) {
+            setErrorStyle(_userNameLineEdit);
+            hasError = true;
+        }
+        if (_passwordLineEdit->text().isEmpty()) {
             setErrorStyle(_passwordLineEdit);
             hasError = true;
         }
-
-        if (dbType == "Oracle") {
-            if (_userNameLineEdit->text().isEmpty()) {
-                setErrorStyle(_userNameLineEdit);
-                hasError = true;
-            }
-            if (_passwordLineEdit->text().isEmpty()) {
-                setErrorStyle(_passwordLineEdit);
-                hasError = true;
-            }
-            if (_serviceNameLineEdit->text().isEmpty()) {
-                setErrorStyle(_serviceNameLineEdit);
-                hasError = true;
-            }
+        if (_serviceNameLineEdit->text().isEmpty()) {
+            setErrorStyle(_serviceNameLineEdit);
+            hasError = true;
         }
+    }
 
-        if (dbType == "MDB-SQL") {
-            if (_nodeNameLineEdit->text().isEmpty()) {
-                setErrorStyle(_nodeNameLineEdit);
-                hasError = true;
-            }
+    if (dbType == "MDB-SQL") {
+        if (_nodeNameLineEdit->text().isEmpty()) {
+            setErrorStyle(_nodeNameLineEdit);
+            hasError = true;
         }
+    }
 
-        if (hasError) {
-            ElaMessageBar::warning(ElaMessageBarType::Top, "警告", "请填写所有必填项", 3000, this);
-            return;
-        }
+    if (hasError) {
+        ElaMessageBar::warning(ElaMessageBarType::Top, "警告", "请填写所有必填项", 3000, this);
+        return;
     }
 
     accept();
-}
-
-void ElaDatabaseConnectionDialog::onBrowseSqliteFile()
-{
-    QString filePath = QFileDialog::getOpenFileName(
-        this,
-        "选择 SQLite 数据库文件",
-        QDir::homePath(),
-        "SQLite 数据库文件 (*.db *.sqlite *.sqlite3 *.db3);;所有文件 (*)"
-    );
-    if (!filePath.isEmpty()) {
-        _sqliteFileLineEdit->setText(filePath);
-    }
 }
\ No newline at end of file
diff --git a/src/dialogs/ElaDatabaseConnectionDialog.h b/src/dialogs/ElaDatabaseConnectionDialog.h
index aa4c0ab..eecdfa1 100644
--- a/src/dialogs/ElaDatabaseConnectionDialog.h
+++ b/src/dialogs/ElaDatabaseConnectionDialog.h
@@ -2,13 +2,14 @@
 #define ELADATABASECONNECTIONDIALOG_H
 
 #include <QDialog>
+#include <QLabel>
 #include <QGridLayout>
 #include "ElaLineEdit.h"
 #include "ElaComboBox.h"
 #include "ElaPushButton.h"
 #include "ElaText.h"
 
-class ElaToolButton;
+class QGridLayout;
 
 class ElaDatabaseConnectionDialog : public QDialog
 {
@@ -22,6 +23,8 @@ public:
     QString getPort() const;
     QString getConnectionName() const;
     QString getDatabaseName() const;
+    QString getDatabaseFileName() const;
+    void setDatabaseFileName(const QString& fileName);
     QString getUserName() const;
     QString getPassword() const;
     QString getServiceName() const;
@@ -48,7 +51,7 @@ private Q_SLOTS:
     void onPasswordTextChanged(const QString& text);
     void onServiceNameTextChanged(const QString& text);
     void onNodeNameTextChanged(const QString& text);
-    void onBrowseSqliteFile();
+    void onBrowseClicked();
 
 private:
     void updateFormFields();
@@ -57,7 +60,12 @@ private:
     
     QGridLayout* _formLayout;
     ElaComboBox* _dbTypeComboBox;
+    ElaText* _dbTypeLabel;
     
+    ElaText* _dbFileLabel;
+    ElaLineEdit* _dbFileLineEdit;
+    ElaPushButton* _browseButton;
+
     ElaText* _hostLabel;
     ElaLineEdit* _hostLineEdit;
 
@@ -84,10 +92,6 @@ private:
     
     ElaText* _licenseKeyLabel;
     ElaLineEdit* _licenseKeyLineEdit;
-
-    ElaText* _sqliteFileLabel;
-    ElaLineEdit* _sqliteFileLineEdit;
-    ElaToolButton* _sqliteBrowseButton;
     
     ElaPushButton* _testButton;
     ElaPushButton* _okButton;
diff --git a/src/mainwindow/mainwindow.cpp b/src/mainwindow/mainwindow.cpp
index a65f11f..0815fca 100644
--- a/src/mainwindow/mainwindow.cpp
+++ b/src/mainwindow/mainwindow.cpp
@@ -24,6 +24,8 @@ void MainWindow::initWindow()
     resize(900, 600);
     setMinimumSize(800, 500);
     setUserInfoCardVisible(false);
+    // 默认以最大化窗口启动
+    showMaximized();
     
     // 隐藏返回和前进按钮
 
diff --git a/src/pages/DatabaseManagerPage.cpp b/src/pages/DatabaseManagerPage.cpp
index 91f89be..96b80bd 100644
--- a/src/pages/DatabaseManagerPage.cpp
+++ b/src/pages/DatabaseManagerPage.cpp
@@ -33,7 +33,9 @@
 #include <QTextEdit>
 #include <QRegularExpression>
 #include <QSet>
+#include <QSettings>
 #include "utils/logmanager.h"
+#include "utils/configmanager.h"
 #include <Qsci/qsciscintilla.h>
 #include <Qsci/qscilexersql.h>
 #include <Qsci/qsciapis.h>
@@ -325,14 +327,50 @@ void DatabaseManagerPage::onConnectionManage()
         QString selectedKey = dialog.getSelectedConnectionKey();
         if (!selectedKey.isEmpty()) {
             _currentConnectionKey = selectedKey;
+            // 记住本次手动加载的连接，作为下一次启动的默认连接
+            markDefaultConnection(selectedKey);
             updateConnectionInfo();
             refreshTables();
         }
     }
 }
 
+void DatabaseManagerPage::markDefaultConnection(const QString& key)
+{
+    if (key.isEmpty()) return;
+    QSettings* settings = appConnectionsSettings();
+    const QStringList groups = settings->childGroups();
+    for (const QString& group : groups) {
+        settings->beginGroup(group);
+        settings->setValue("isDefault", (group == key));
+        settings->endGroup();
+    }
+    settings->sync();
+}
+
+QString DatabaseManagerPage::getDefaultConnectionKey()
+{
+    QSettings* settings = appConnectionsSettings();
+    const QStringList groups = settings->childGroups();
+    for (const QString& group : groups) {
+        settings->beginGroup(group);
+        bool isDefault = settings->value("isDefault", false).toBool();
+        settings->endGroup();
+        if (isDefault)
+            return group;
+    }
+    return QString();
+}
+
 void DatabaseManagerPage::loadConnections()
 {
+    // 启动时自动连接上一次加载（设为默认）的数据库
+    QString defaultKey = getDefaultConnectionKey();
+    if (!defaultKey.isEmpty() && ConnectionParams::fromSettings(defaultKey).dbType != "") {
+        _currentConnectionKey = defaultKey;
+        updateConnectionInfo();
+        refreshTables();
+    }
 }
 
 void DatabaseManagerPage::refreshTables()
@@ -344,6 +382,13 @@ void DatabaseManagerPage::refreshTables()
 
     // 切换连接时关闭旧连接，确保重新建立新数据库连接
     if (_connector) {
+        // 关键：先解绑视图并销毁旧的 EditableSqlModel，
+        // 否则 _dataModel 内部持有的 QSqlQuery 仍指向即将被删除的数据库连接，导致后续访问崩溃
+        if (_dataTableView) _dataTableView->setModel(nullptr);
+        if (_dataModel) {
+            delete _dataModel;
+            _dataModel = nullptr;
+        }
         delete _connector;
         _connector = nullptr;
     }
@@ -351,6 +396,10 @@ void DatabaseManagerPage::refreshTables()
     _currentTableName.clear();
     _lastExecutedSql.clear();
     _currentPage = 1;
+    if (!_dataModel) {
+        _dataModel = new EditableSqlModel(this);
+        if (_dataTableView) _dataTableView->setModel(_dataModel);
+    }
     _dataModel->clear();
     _dataModel->clearChanges();
 
diff --git a/src/pages/DatabaseManagerPage.h b/src/pages/DatabaseManagerPage.h
index 38e488b..f5ea86e 100644
--- a/src/pages/DatabaseManagerPage.h
+++ b/src/pages/DatabaseManagerPage.h
@@ -2,16 +2,22 @@
 #define DATABASEMANAGERPAGE_H
 
 #include <QWidget>
+#include <QTableView>
+#include <QLineEdit>
+#include <QSqlQueryModel>
 #include <QStandardItemModel>
 #include <QSortFilterProxyModel>
+#include <QSplitter>
+#include <QListView>
 #include <QLabel>
-#include <QComboBox>
+#include <QGroupBox>
+#include <QCoreApplication>
 
 class QsciScintilla;
 class QsciLexerSQL;
 class QsciAPIs;
+class QComboBox;
 
-class EditableSqlModel;
 class ElaTableView;
 class ElaLineEdit;
 class ElaPushButton;
@@ -19,8 +25,9 @@ class ElaToolButton;
 class ElaComboBox;
 class ElaListView;
 class ElaTabWidget;
+
+class EditableSqlModel;
 class DatabaseConnector;
-struct ConnectionParams;
 
 class DatabaseManagerPage : public QWidget
 {
@@ -39,24 +46,27 @@ private:
     bool openDatabase();
     void updateConnectionInfo();
     void onConnectionManage();
+    static void markDefaultConnection(const QString& key);
+    static QString getDefaultConnectionKey();
     void onTableDoubleClicked(const QModelIndex& index);
     void onExecuteSql();
     void onTableSearchTextChanged(const QString& text);
     void onSubmitChanges();
     void onExportData();
-    void onPrevPage();
-    void onNextPage();
-    void onPageSizeChanged(int index);
+    void onPreviewChanges();
+    void updateUndoRedoButtons();
 
     QWidget* createSqlEditorTab();
     QsciScintilla* currentEditor() const;
     void onAddTab();
-    void loadTableData(int page = 1);
+
+    void loadTableData(int page);
+    void onPrevPage();
+    void onNextPage();
+    void onPageSizeChanged(int index);
 
     QString getCurrentSqlContent();
     int _tabCounter = 0;
-    int _currentPage = 1;
-    int _pageSize = 100;
 
 private:
     ElaListView* _tableView;
@@ -68,23 +78,25 @@ private:
     ElaToolButton* _addRecordButton;
     ElaToolButton* _submitButton;
     ElaToolButton* _exportButton;
-    QLabel* _connectionInfoLabel;
-    QLabel* _rowCountLabel;
-    QLabel* _pendingChangesLabel;
-    QLabel* _pageLabel;
     ElaToolButton* _prevButton;
     ElaToolButton* _nextButton;
+    QLabel* _connectionInfoLabel;
+    QLabel* _rowCountLabel;
+    QLabel* _pageLabel;
+    QLabel* _pendingChangesLabel;
     QComboBox* _pageSizeCombo;
     ElaTabWidget* _sqlTabWidget;
     EditableSqlModel* _dataModel;
     QStandardItemModel* _tableModel;
     QSortFilterProxyModel* _tableProxyModel;
 
+    DatabaseConnector* _connector = nullptr;
     QString _currentConnectionKey;
     QString _currentTableName;
     QString _lastExecutedSql;
-
-    DatabaseConnector* _connector = nullptr;   // 当前数据库连接器
+    QString _lastConnectedKey;
+    int _currentPage = 1;
+    int _pageSize = 100;
 
     QList<QsciScintilla*> _editorList;
     QList<QsciAPIs*> _apisList;
diff --git a/src/utils/configmanager.cpp b/src/utils/configmanager.cpp
index bf20808..a08ad72 100644
--- a/src/utils/configmanager.cpp
+++ b/src/utils/configmanager.cpp
@@ -24,9 +24,9 @@ ConfigManager* ConfigManager::instance()
     return _instance;
 }
 
-void ConfigManager::loadConfig(const QString& basePath)
+void ConfigManager::loadConfig()
 {
-    _configPath = QDir(basePath).filePath("config.ini");
+    _configPath = QDir(appConfigDir()).filePath("config.ini");
     _settings = new QSettings(_configPath, QSettings::IniFormat);
     
     _settings->beginGroup("Database");
@@ -116,4 +116,21 @@ void ConfigManager::setDatabaseType(const QString& type)
 void ConfigManager::saveConfig()
 {
     _settings->sync();
+}
+
+QString appConfigDir()
+{
+    QString dir = QDir(QCoreApplication::applicationDirPath()).filePath("config");
+    QDir().mkpath(dir);
+    return dir;
+}
+
+QSettings* appConnectionsSettings()
+{
+    static QSettings* s = nullptr;
+    if (!s) {
+        QString path = QDir(appConfigDir()).filePath("config.ini");
+        s = new QSettings(path, QSettings::IniFormat);
+    }
+    return s;
 }
\ No newline at end of file
diff --git a/src/utils/configmanager.h b/src/utils/configmanager.h
index da9d7c4..2b22443 100644
--- a/src/utils/configmanager.h
+++ b/src/utils/configmanager.h
@@ -9,7 +9,7 @@ class ConfigManager
 public:
     static ConfigManager* instance();
     
-    void loadConfig(const QString& basePath);
+    void loadConfig();
     
     QString getDatabaseHost() const;
     QString getDatabasePort() const;
@@ -36,4 +36,8 @@ private:
     QString _configPath;
 };
 
+// 指向 "程序目录/config/config.ini" 的共享 QSettings（IniFormat），用于数据库连接列表存储
+QSettings* appConnectionsSettings();
+QString appConfigDir();
+
 #endif // CONFIGMANAGER_H
\ No newline at end of file