问答题Sqlconnection对象
问答题
Sqlconnection对象
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打开SQLConnection时返回的SQLServer错误号为4060，该错误表示()。A.连接字符串指定的服务器名称无效B.连接字符串指定的数据库名称无效C.连接超时D.连接字符串指定的用户名或密码错误
oucreateapageinanASP.NETWebapplication.ThepageretrievesanddisplaysdatafromaMicrosoftSQLServerdatabase.Youneedtocreateadatasourcethatcanconnecttothedatabase.Whataretwopossiblewaystoachievethisgoal?() A.UseanObjectDataSourcecontrolandsetitsTypeNamepropertyto System.Data.SqlClient.SqlConnection.B.UseaSqlDataSourcecontrolandconfigureitsConnectionStringintheweb.configfile.C.UseanXmlDataSourcecontroltogetherwithanXmlcontrolthatrepresentsthedatabase.D.UseaLinqDataSourcecontrolwithentityclassesthatrepresenttheelementsinthedatabase.
某公司使用ASP.NET+SQL Server开发电子商务网站，该网站分为前台和后台两部分，前台具有会员登录、商品展示、商品搜索、个人中心和购物车等功能；后台具有商品管理、会员管理和订单管理等功能。5、ASP.NET访问数据库一般采用ADO.NET。ADO.NET主要包含Connection对象、Command对象、DataReader对象、DataAdapter对象、DataSet对象和DataView对象等。建立数据源连接使用的对象是______。连接对象创建完成后，打开连接，需使用的方法是______；连接对象使用结束后，一般需要关闭连接，使用的方法是______。如果在操作数据库时，需要大批量地处理数据或者想在断开数据库连接的情况下操作数据，.NET使用______对象将数据从数据库服务器中取出，并将数据存入______对象中。如果要添加、修改或删除数据，需要使用______对象。6、该电子商务网站数据库business中包含一张新闻表，名为news，结构如下表所示。现在发现news表中缺少字段“新闻作者”，要求使用SQL语句添加该字段，字段名为newsauthor，数据类型为varchar，长度为20，默认值为admin。请根据题目说明，将SQL语句补充完整。ALTER TABLE ______ ADD ______ (20) default'______'.7、现要设计一个根据关键字搜索新闻及显示搜索结果的页面，页面包含的基本元素为：搜索关键字文本框，控件id为txtKeyword；搜索按钮，控件id为btnSearch；数据绑定显示控件gvNews。请根据题目说明，将空缺的代码补充完整。protected void btnsearch_Click(object sender,EventArgs e){String strcon="server='DBServer';database='business';uid='sa';pwd='sa';";Sqlconnection con=new sqlconnection(strcon);string keyword=this. ______.Text;string sqlstr="select*from news where ______ like '%"+keyword+"%'or ______ like '%"+keyword+"%'";try{SqlDataAdapter da=new sqlDataAdapter(______,con);DataSet ds=new DataSet();Da.Fill(______);gvNews.______=ds.Tables[0];gvNews.DataBind();}catch{ ?Response.write("无法连接数据库");}}
在UML语言中，下图中的a、b、c三种图形符号按照顺序分别表示 ( ) 。A.边界对象、实体对象、控制对象B.实体对象、边界对象、控制对象C.控制对象、实体对象、边界对象D.边界对象、控制对象、实体对象
在access数据库中包括那些对象（）。A、表对象、查询对象、窗体对象、页对象B、报表对象、宏对象、模块对象、页对象C、表对象、页对象、窗体对象、模块对象D、表对象、查询对象、窗体对象、报表对象、页对象、宏对象、模块对象
（）方法的作用是创建并返回一个与SqlConnection相关联的SqlCommand对象。A、ExecuteReader（）B、Open（）C、CreateCommand（）D、ExecuteNonQuery（）
You are creating a Web Form. You write the following code segment to create a SqlCommand object.Dim conn As SqlConnection = New SqlConnection(connString)conn.Open（ ）Dim cmd As SqlCommand = conn.CreateCommand（ ）cmd.CommandText = "select count(*) from Customers"You need to display the number of customers in the Customers table. Which two code segments can you use to achieve this goal?（）A、Dim customerCount As Object = cmd.ExecuteScalar()lblCompanyName.Text = customerCount.ToString()B、Dim customerCount As Integer = cmd.ExecuteNonQuery()lblCompanyName.Text = customerCount.ToString()C、Dim dr As SqlDataReader = cmd.ExecuteReader()dr.Read()lblCompanyName.Text = dr(0).ToString()D、Dim dr As SqlDataReader = cmd.ExecuteReader()dr.Read()lblCompanyName.Text = dr.ToString()
你正在开发一个使用 SqlConnection 对象连接到 Microsoft SQL Server 数据库的应用。你的连接对象正在使用连接池。当连接池满的时候请求将被排队或者某些连接请求可能被拒绝。你需要确保应用能够尽早的释放连接给连接池。因此，为了减少连接被拒的可能性，你应该从下面那三个方法着手解决？（）A、确保完成执行后调用每个连接对象的Close方法。B、确保完成执行后每个连接对象保持打开状态。C、在连接字符串内增加Max Pool Size的值。D、在连接字符串内增加Min Pool Size的值。E、在连接字符串内增加Connection Lifetime的值。F、增加SqlConnection对象的ConnectionTimeout属性的值。
You are developing an application that connects to a Microsoft SQL Server database using the SqlConnection object. Your connection objects are being pooled. As the pool fills up, connection requests are queued. Some connection requests are rejected. You need to ensure that the application releases connections back to the pool as soon as possible. Also, you need to decrease the likelihood that connection requests will be rejected. Which three actions should you perform?（）A、Ensure that the Close method is called on each connection object after it has finishedexecuting.B、Ensure that each connection object is left open after it has finished executing.C、Increase the Max Pool Size value inside the connection string.D、Increase the Min Pool Size value inside the connection string.E、Increase the Connection Lifetime value inside the connection string.F、Increase the value of the ConnectionTimeout property of the SqlConnection object.
You work as an application developer at Contoso.com. You use Microsoft .NET Framework 3.5 and Microsoft ADO.NET to develop an application. The Contoso.com network contains a Microsoft SQL Server 2005 server named DB01. Your application retrieve records from a database named Trades that resides on DB01. The application connects to Trades by using an instance of the SqlConnection class with the following connection string. "Data Source=DB01；UID=’mhamm’；PWD=’password’；" When the application calls the Open method of the SqlConnection object， it displays the following： "Cannot open user default database. Login failed. Login failed for user ’mhamm’". You need to make sure that you can connect to Trades when the user account for the connection is mhamm. What should you do？ （）A、 Change the connection string as follows：Data Source=DB01；Initial Catalog=Trades；UID=mhamm； PWD=password；"B、 Create a login for Mia Hamm on DB01.C、 Create a database user object in Trades and map the object to the SQL Server 2005 Login of Mia Hamm.D、 Change the connection string as follows："Server=DB01；Database=Trades；UID=mhamm；PWD=password；"
You work as an application developer at Contoso.com. You use Microsoft .NET Framework 3.5 and Microsoft ADO.NET to develop an application. The database on the Microsoft SQL Server 2005 database has two tables that are displayed by using two SqlConnection objects in two different GridView controls. You want the tables to be displayed at the same time with the use a single SqlConnection object. What should you do？（）A、 Create a bound connection by using the sp_getbindtoken and the sp_bindsession stored procedures.B、 Enable Multiple Active Result Sets （MARS） in the connection string of the application. C、 Create an exception handler for the connection-busy exception that is thrown on using a single SqlConnection object.D、 Run the two SqlDataReader objects by using a single SqlCommand object.
单选题你用VisualStudio.NET开发了一个基于Windows的应用程序，这个应用程序可以访问MicrosoftSQLServer数据库。你的应用程序包含一个名叫CustomerForm的窗体。你添加了一个名为design-time的组件到窗体中：名为TestKingConnection的SqlConnection对象；名为TestKingDataAdapter的SqlDataAdapter对象；名为TestKingDataSet的DataSet对象；5个TextBox控件用来保存TestKingDataSet的值。在设计时，你将每个TextBox控件的DataBindings属性设置为TestKingDataSet对象的DataTable的适当的列。当你调试应用程序时，你能成功地连接到数据库，而，没有数据显示在任何一个TextBox中。你需要修改你的应用程序代码确保数据能适当地显示。当CustomerForm.Load事件处理器运行时，将发生哪个行为？（）A调用TextBoxes的DataBindingscollection的Add方法，并将TestKingDataSet作为参数传给它；B调用TestKingDataSet的BeginInit方法；C调用TestKingConnection的Open方法；D调用TestKingDataAdapter的FillSchema方法，并将TestKingDataSet作为参数传给它；E调用TestKingDataAdapter的Fill方法，并将TestKingDataSet作为参数传给它。
多选题ou create a page in an ASP.NET Web application. The page retrieves and displays data from a Microsoft SQL Server database. You need to create a data source that can connect to the database. What are two possible ways to achieve this goal？（）AUse an ObjectDataSource control and set its TypeName property to System.Data.SqlClient.SqlConnection.BUse a SqlDataSource control and configure its ConnectionString in the web.config file.CUse an XmlDataSource control together with an Xml control that represents the database.DUse a LinqDataSource control with entity classes that represent the elements in the database.
单选题You work as an application developer at Contoso.com. You use Microsoft .NET Framework 3.5 and Microsoft ADO.NET to develop an application. The database on the Microsoft SQL Server 2005 database has two tables that are displayed by using two SqlConnection objects in two different GridView controls. You want the tables to be displayed at the same time with the use a single SqlConnection object. What should you do？（）A Create a bound connection by using the sp_getbindtoken and the sp_bindsession stored procedures.B Enable Multiple Active Result Sets （MARS） in the connection string of the application. C Create an exception handler for the connection-busy exception that is thrown on using a single SqlConnection object.D Run the two SqlDataReader objects by using a single SqlCommand object.
单选题在access数据库中包括那些对象（）。A表对象、查询对象、窗体对象、页对象B报表对象、宏对象、模块对象、页对象C表对象、页对象、窗体对象、模块对象D表对象、查询对象、窗体对象、报表对象、页对象、宏对象、模块对象
单选题你使用VisualStudio.NET开发了一个基于Windows的应用程序App。App使用对象SqlConnection来进行数据库访问。你在一台内存和硬盘空间均受限制的计算机上运行App。当代码完成对SqlConnection对象的使用后，你必须保证连接被关闭，且任何被该对象使用的资源必须立即释放。你该做什么？（）A调用SqlConnection对象的Finalize方法B调用SqlConnection对象的Dispose方法C设置SqlConnection对象为NothingD设置SqlConnection对象为“”
多选题你正在开发一个使用 SqlConnection 对象连接到 Microsoft SQL Server 数据库的应用。你的连接对象正在使用连接池。当连接池满的时候请求将被排队或者某些连接请求可能被拒绝。你需要确保应用能够尽早的释放连接给连接池。因此，为了减少连接被拒的可能性，你应该从下面那三个方法着手解决？（）A确保完成执行后调用每个连接对象的Close方法。B确保完成执行后每个连接对象保持打开状态。C在连接字符串内增加Max Pool Size的值。D在连接字符串内增加Min Pool Size的值。E在连接字符串内增加Connection Lifetime的值。F增加SqlConnection对象的ConnectionTimeout属性的值。
单选题你要用VisualStudio.NET设计一个基于windows的程序，你的程序包含一个名为CustomerForm的form，它包含下面控件： 名为TestKingConnection的SQLConnection对象 名为TestKingDataAdapter的SQLDataAdapter对象 名为CustomerDataSet的DataSet对象 5个TextBox与CustomerDataSet绑定 一个名为saveButton的Button在设计的时候你为每个TextBox的DataBindings属性为CustomerDataSet的DataTable特定的列当程序运行的时候，用户必须能够编辑textboxes显示的信息，当点击saveButton所有用户的改变必须保存到合适的数据库，这个按钮事件包含下面的程序片段TestKingDataAdapter.Update（CustomerDataSet）；你编译程序，但是saveButton没有保存任何改变你需要改正这个问题：（）ACall the InsertCommand method of TestKingDa taAdapter.运行TestKingDataAdapter中的InsertCommand方法BCALL THE Update method of TestKingDataAdapter and pass in TestKingConnection.运行TestKingDataAdapter的Update方法并且通过TestKingConnectionCBefore calling the Update method，ensur ethat a row position change occurs in CustomerDataSet.在运行Upate方法，确保行位置在CustomerDataSet的改变DRees tablish the database connecti on by calling the Open method of TestKingConnection.重新连接数据库通过运行TestKingConnection
单选题你创建了一个ASP.NET的应用程序。此应用程序采用集成安全来从MicrosoftSQLServer数据库Order获得数据。你需要为应用程序提供一个连接字符串来连接数据库Order。你想把这个连接字符串保存在Weconfig文件中。你该如何建立Weconfig文件？（）A在节中，创建一个节，SQLConnection赋值给key属性值，连接字符串赋值给value属性值B在节中，创建一个节，在创建一个节，使其value属性值为连接字符串C在authorization节中，创建一个节，在创建一个节，使其value属性值为连接字符串D在authorization节中，创建一个节，SQLConnection赋值给key属性值，连接字符串赋值给value属性值