/// <summary>
/// 通过指定的连接字符串并创建 SQL Server 数据库访问器
/// </summary>
/// <param name="builder">数据库访问上下文构建器</param>
/// <param name="connectionString">连接字符串</param>
/// <returns>SQL Server 数据库访问器</returns>
public static DbContext.Builder UseSqlServer(this DbContext.Builder builder, string connectionString)
{
builder.SetDbProvider(new SqlServerDbProvider(connectionString));
return(builder);
}
