微软企业库中的动态改变连接字符串,修改后转向新的数据库查询

微软企业库，可以连接不同的数据库。(winform下测试成功)

Database db = DatabaseFactory.CreateDatabase();

运行时，会根据用户配置的不同，而创建不同的数据库实例。如果能够在程序运行后，动态修改数据库的连接字符串呢？本文提供了笔者的一种动态修改软企业库连接字符串的方法

/// <summary>

/// 读取数据库默认连接字符串

/// </summary>

/// <returns></returns>

private string ReadDefaultConnectString()

{

Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);

ConfigurationSection dataConfigurationSection = config.Sections["dataConfiguration"];

string defaultDatabase = (dataConfigurationSection as Microsoft.Practices.EnterpriseLibrary.Data.Configuration.DatabaseSettings).DefaultDatabase;

ConfigurationSection connectionConfigurationSection = config.Sections["connectionStrings"];

ConnectionStringsSection connectionStringsSection = connectionConfigurationSection as ConnectionStringsSection;

return connectionStringsSection.ConnectionStrings[defaultDatabase].ConnectionString;

}

/// <summary>

/// 保存数据库默认连接字符串

/// </summary>

/// <param name="connectString"></param>

private void SaveDefaultConnectString(string connectString)

{

Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);

ConfigurationSection dataConfigurationSection = config.Sections["dataConfiguration"];

string defaultDatabase = (dataConfigurationSection as Microsoft.Practices.EnterpriseLibrary.Data.Configuration.DatabaseSettings).DefaultDatabase;

ConfigurationSection connectionConfigurationSection = config.Sections["connectionStrings"];

ConnectionStringsSection connectionStringsSection = connectionConfigurationSection as ConnectionStringsSection;

connectionStringsSection.ConnectionStrings[defaultDatabase].ConnectionString = connectString;

config.Save();

}

/// <summary>

/// 刷新数据库默认连接字符串

/// </summary>

private void RefreshConfig()

{

ConfigurationManager.RefreshSection("dataConfiguration");

ConfigurationManager.RefreshSection("connectionStrings");

}