数据库连接-连接字符串

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VBA编程中的数据库连接与操作详解

VBA编程中的数据库连接与操作详解

VBA编程中的数据库连接与操作详解VBA(Visual Basic for Applications)是一种用于编写Microsoft Office 应用程序的编程语言。

在VBA编程中,与数据库的连接和操作是非常重要的一部分。

本文将详细介绍VBA编程中的数据库连接和操作,并提供一些实例来帮助读者更好地理解。

一、数据库连接1. 连接字符串数据库连接通常需要使用连接字符串来指定数据库的位置和其他连接参数。

连接字符串的格式取决于所使用的数据库类型。

下面是一些常见数据库的连接字符串示例:- Access数据库:Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\myFolder\myDatabase.accdb;Persist SecurityInfo=False;- SQL Server数据库:Provider=SQLOLEDB;DataSource=serverName;Initial Catalog=databaseName;UserID=userName;Password=password;- MySQL数据库:Driver={MySQL ODBC 5.3Driver};Server=serverAddress;Database=databaseName;User=user ;Password=password;Option=3;需要注意,以上示例中的连接字符串仅供参考,实际使用时应根据具体情况进行修改。

2. 打开连接在VBA中,可以使用ADODB(ActiveX Data Objects)对象来进行数据库操作。

首先需要创建一个ADODB.Connection 对象,并使用连接字符串来打开连接。

下面是一个示例:```vbaDim conn As ObjectSet conn = CreateObject("ADODB.Connection")conn.ConnectionString ="Provider=Microsoft.ACE.OLEDB.12.0;DataSource=C:\myFolder\myDatabase.accdb;Persist SecurityInfo=False;"conn.Open```在打开连接之前,可以根据需要设置连接对象的其他属性,如CommandTimeout(执行命令的超时时间)和CursorLocation(指定游标的位置)等。

doris数据库拼接字符串的做法

doris数据库拼接字符串的做法

doris数据库拼接字符串的做法
拼接字符串是在数据库中常见的操作,通常用于将多个字符串连接成一个字符串。

在Doris数据库中,可以使用内置的concat函数来实现字符串的拼接操作。

具体做法如下:
1. 使用concat函数:Doris数据库中的concat函数可以接受多个参数,并将它们按顺序连接起来。

例如,如果要将字段A、字段B和常量字符串连接起来,可以使用以下语法:
SELECT CONCAT(A, B, 'constant') AS new_string FROM table_name;
2. 使用concat_ws函数:如果需要在连接字符串之间添加分隔符,可以使用concat_ws函数。

该函数的第一个参数是分隔符,后面的参数是要连接的字符串。

例如:
SELECT CONCAT_WS(',', A, B, C) AS new_string FROM table_name;
3. 使用加号运算符:除了使用内置函数外,还可以使用加号运
算符来进行字符串的拼接操作。

例如:
SELECT A + B AS new_string FROM table_name;
需要注意的是,在进行字符串拼接时,要确保数据类型的一致性,避免出现意外的类型转换。

此外,对于大规模数据的字符串拼接操作,还需要考虑性能和资源消耗的因素,可以通过合理的索引设计、分区等方式来优化查询性能。

综上所述,Doris数据库中可以通过内置的concat函数、concat_ws函数或加号运算符来实现字符串的拼接操作,开发人员可以根据具体的业务需求和性能要求选择合适的方法来进行字符串拼接。

几种常见的数据库连接方法

几种常见的数据库连接方法

几种常见的数据库连接方法一、连接Access数据库1.使用已有DSN的连接字符串进行连接(ODBC)使用DSN进行连接〃导入命名空间using System.Data.Odbc;protected void Page_Load(Object sender,EventArgs e)(〃设置连接字符串String connstr=@"DSN=sample";〃实例化Connection对象OdbcConnection myConnection = new OdbcConnection(connstr);〃执行Open方法打开连接myConnection.Open();〃执行SQL语句OdbcCommand myCommand new OdbcCommand("select * from sampletable",myConnection);〃将查询的结果赋给GridView的数据源gv.DataSource = myCommand.ExecuteReader();〃绑定GridViewgv.DataBind();〃关闭连接myConnection.Close();)2.使用无DSN的连接字符串进行连接(ODBC)不使用DSN进行连接〃导入命名空间using System.Data.Odbc;protected void Page_Load(Object sender,EventArgs e)(〃设置连接字符串String connstr=@"Driver=Microsoft Access Driver (*.mdb);Dbq=c:\sample.mdb;";〃实例化Connection对象OdbcConnection myConnection = new OdbcConnection(connstr);〃执行Open方法打开连接myConnection.Open();〃执行SQL语句OdbcCommand myCommand new OdbcCommand("select * from sampletable",myConnection);〃将查询的结果赋给GridView的数据源gv.DataSource = myCommand.ExecuteReader();〃绑定GridViewgv.DataBind();〃关闭连接myConnection.Close();)3.使用连接字符串进行连接(OLEDB) Data Provider 支持的OLEDB Provider:SQLOLEDB:用来访问SQL Server数据库MSDAORA:用来访问Oracle数据库Microsoft.Jet.OLEDB.4.0:用来访问Access 数据库。

MySQL中的连接字符串和连接选项配置

MySQL中的连接字符串和连接选项配置

MySQL中的连接字符串和连接选项配置在数据库应用程序中,连接到数据库是一个重要的步骤,连接字符串和连接选项配置是实现这一步骤的关键。

MySQL作为一种流行的关系型数据库管理系统(RDBMS),提供了丰富的连接字符串和连接选项配置功能,使得开发人员能够更好地控制和管理数据库连接。

连接字符串是用于指定数据库连接的字符串参数,包括数据库的地址、端口号、用户名、密码等信息。

连接选项配置是一组用于优化和调整数据库连接行为的参数,包括连接池大小、读写超时时间、字符编码等设置。

本文将详细介绍MySQL中连接字符串和连接选项配置的相关知识,希望能够帮助读者更好地理解和应用。

一、连接字符串连接字符串是用于指定数据库连接的字符串参数,它可以根据实际需求来设置不同的参数,以满足不同的数据库连接使用场景。

常见的连接字符串包括以下几个部分:1. 数据库地址数据库地址是指数据库服务器的地址和端口号,格式为"host:port"。

例如,localhost:3306表示连接到本地MySQL服务器的默认端口。

2. 用户名和密码用户名和密码是用于数据库身份验证的凭据,格式为"username:password"。

例如,root:123456表示使用用户名root和密码123456进行身份验证。

3. 数据库名称数据库名称是指要连接的数据库的名称,格式为"dbname"。

例如,mydatabase表示连接到名为mydatabase的数据库。

4. 字符编码字符编码是指数据库中存储的字符数据的编码格式,常用的编码格式包括UTF-8、GBK等。

可以通过设置字符编码来确保数据的正确存储和读取。

5. 其他可选参数除了上述基本参数外,连接字符串还可以包含其他可选参数,用于进一步优化和调整数据库连接行为。

例如,可以设置连接超时时间、读写超时时间、连接池大小等参数。

二、连接选项配置连接选项配置是一组用于优化和调整数据库连接行为的参数,可以通过连接字符串的方式进行配置。

MySQL中的连接方式与连接字符串配置

MySQL中的连接方式与连接字符串配置

MySQL中的连接方式与连接字符串配置MySQL是一个开源的关系型数据库管理系统,被广泛应用于各种规模的应用程序中。

在使用MySQL进行数据库操作时,连接方式和连接字符串的配置是非常重要的一部分。

本文将对MySQL中的连接方式以及连接字符串的配置进行详细介绍。

一、连接方式在MySQL中,有多种连接方式可供选择,包括本地连接、远程连接、连接池等。

不同的连接方式适用于不同的场景,下面分别介绍这些连接方式的特点和用法。

1. 本地连接本地连接是指在同一台机器上进行MySQL数据库的连接。

当应用程序和数据库位于同一台服务器上时,可以使用本地连接方式。

本地连接速度较快,适用于对响应时间要求较高的场景。

2. 远程连接远程连接是指通过网络连接到另一台机器上的MySQL数据库。

远程连接需要指定远程服务器的IP地址或域名、端口号以及登录凭证等信息。

远程连接具有灵活性,能够在不同的机器之间进行数据库操作,适用于分布式系统或跨地域合作的场景。

3. 连接池连接池是一种重复使用数据库连接的技术,在多用户并发访问数据库的情况下,可以减少数据库连接的创建与关闭的开销。

连接池会创建一定数量的数据库连接,在应用程序需要时分配给不同的线程,使用完毕后又归还给连接池。

连接池可以提高数据库的性能和并发访问能力。

二、连接字符串配置连接字符串是用于连接数据库的一串参数值组成的字符串。

不同的数据库管理系统有不同的连接字符串格式和参数。

在MySQL中,连接字符串的配置可以通过以下几个方面进行设置。

1. 主机名或IP地址连接MySQL需要指定要连接的主机名或IP地址。

可以使用域名解析将域名映射到对应的IP地址,也可以直接使用IP地址进行连接。

主机名或IP地址用于标识数据库所在的服务器。

2. 端口号MySQL默认的端口号是3306,但在实际应用中,可能由于安全设置或其他原因而修改了默认端口号。

连接MySQL时需要指定正确的端口号,否则将无法建立连接。

数据库连接失败的常见原因及解决办法

数据库连接失败的常见原因及解决办法

数据库连接失败的常见原因及解决办法数据库连接是许多应用程序和系统的核心组成部分,当连接失败时,将对应用程序的正常运行产生负面影响。

因此,了解数据库连接失败的常见原因以及相应的解决办法对于维护和优化系统具有重要意义。

本文将介绍一些常见的数据库连接失败原因,并提供相应的解决办法,以帮助读者更好地应对这些问题。

1. 网络问题数据库连接失败的最常见原因之一是网络问题。

网络故障、路由器问题以及防火墙配置错误都可能导致数据库连接失败。

在面对数据库连接失败时,首先需要确保网络连接正常。

解决办法:- 检查网络连接是否正常,包括网线是否插好,Wi-Fi是否正常运行。

- 检查路由器和防火墙的配置,确保数据库端口没有被阻止或限制。

2. 数据库服务器问题数据库服务器故障或配置错误也是数据库连接失败的常见原因之一。

数据库服务器可能会因为资源达到极限、配置错误、权限问题等原因导致连接失败。

解决办法:- 检查数据库服务器的资源使用情况,确保其没有达到极限。

- 检查数据库服务器的配置文件,确保数据库实例的监听端口与应用程序中配置的端口一致。

- 检查数据库服务器的用户权限,确保应用程序所使用的用户有足够的权限连接数据库。

3. 数据库连接字符串配置错误连接字符串是用于建立与数据库之间连接的关键部分。

连接字符串中的错误可能会导致数据库连接失败。

例如,连接字符串中可能未正确指定数据库服务器的地址、端口、数据库名等。

解决办法:- 检查连接字符串,确保其中的服务器地址、端口、数据库名等信息正确无误。

- 使用连接字符串测试工具(如ConnectionTester等)来验证连接字符串的有效性。

4. 数据库账户验证失败数据库账户验证失败也是导致数据库连接失败的常见原因之一。

验证失败可能是由于密码错误、账户被锁定或者账户权限不足等原因引起的。

解决办法:- 确保数据库账户的密码正确无误。

- 检查数据库账户是否被锁定或禁止访问。

- 检查数据库账户的权限,确保其具备连接所需的最低权限。

C#数据库连接字符串

C#数据库连接字符串

C#数据库连接字符串⽂章转载⾄:sa登陆:"Data Source=.;Initial Catalog=数据库;User ID=sa,pwd=;";windows登陆Data Source=.;Initial Catalog=数据库;Integrated Security=Truec#数据库连接字符串集合(⼀)常⽤连接:1.使⽤SqlConnection对象:a. Sql 验证public void SqlConnectionOpen(){SqlConnection conn= new SqlConnection();conn.ConnectionString = "user id=sa;password=;initial catalog=northwind;datasource=localhost;connect Timeout=20";conn.Open();}b. Windows ⾝份验证public void SqlConnectionOpen(){SqlConnection conn= new SqlConnection();conn.ConnectionString = "Integrated Security=SSPI;initial catalog=northwind;datasource=localhost;connect Timeout=20";conn.Open();}2.使⽤OleDbConnection对象:public void OleDBConnectionOpen(){OleDBConnection conn = new OleDbconnection();conn.ConnectionString="Provider=Microsoft.Jet.OLEDB.4.0;DataSource=C:\Customer.mdb";conn.Open();}(⼆)其它:1.ODBC连接Access本地数据库conGoodDay.Open("Driver={Microsoft Access Driver(*.mdb)};"+"Dbq=C:\a.mdb;"+"Uid=Admin;"+"Pwd=;");2.ODBC连接Access系统数据库conGoodDay.Open("Driver={Microsoft Access Driver(*.mdb)};"+"Dbq=C:\a.mdb;"+"SystemDB=Admin;"+"Pwd=;");3.ODBC连接Access系统数据库conGoodDay.Open("Driver={Microsoft Access Driver(*.mdb)};"+"Dbq=\\server\share\a.mdb;");4.ODBC连接Excel系统数据库conGoodDay.Open("Driver={Microsoft Access Driver(*.xls)};"+"DriverId=790;"+"Dbq=C:\a.xls;"+"DefaultDir=c:\somepath;");5.ODBC连接Oracle系统数据库conGoodDay.Open("Driver={Microsoft ODBC for oracle};"+"Server=OracleServer.world;"+"Uid=Admin;"+"Pwd=password;");6.ODBC连接Sql ServrconGoodDay.Open("Driver={Sql Server};"+"Server=myServer;"+"Database=myDatabaseName;""Uid=Admin;"+"Pwd=password;");7.ODBC连接Visual FoxProconGoodDay.Open("Driver={Microsoft Visual FoxPro Driver};"+"SourceType=DBC;"+"SourceDB=c:a.dbc;"+"Exclusive=No;");Windows ⾝份验证建议使⽤ Windows ⾝份验证(有时也称为“集成安全性”)连接到⽀持其的数据源。

(最全的数据库连接字符串)connectionstring

(最全的数据库连接字符串)connectionstring

(最全的数据库连接字符串)connectionstringPS:如果不是太稳定的数据库,最好使用connection lifetime=10来限制连接池内连接的生存日期转自SQL ServerODBCStandard Security:"Driver={SQLServer};Server=Aron1;Database=pubs;Uid=sa;Pwd=asdasd;"Trusted connection:"Driver={SQLServer};Server=Aron1;Database=pubs;Trusted_Connection=yes;"Prompt for username and password:oConn.Properties("Prompt") = adPromptAlwaysoConn.Open "Driver={SQL Server};Server=Aron1;DataBase=pubs;"OLE DB, OleDbConnection (.NET)Standard Security:"Provider=sqloledb;Data Source=Aron1;Initial Catalog=pubs;User Id=sa;Password=asdasd;"Trusted Connection:"Provider=sqloledb;Data Source=Aron1;Initial Catalog=pubs;Integrated Security=SSPI;"(use serverName\instanceName as Data Source to use an specifik SQLServer instance, only SQLServer2000)Prompt for username and password:oConn.Provider = "sqloledb"oConn.Properties("Prompt") = adPromptAlwaysoConn.Open "Data Source=Aron1;Initial Catalog=pubs;"Connect via an IP address:"Provider=sqloledb;DataSource=190.190.200.100,1433;NetworkLibrary=DBMSSOCN;Initial Catalog=pubs;User ID=sa;Password=asdasd;"(DBMSSOCN=TCP/IP instead of Named Pipes, at the end of the Data Source is the port to use (1433 is the default))SqlConnection (.NET)Standard Security:"Data Source=Aron1;Initial Catalog=pubs;User Id=sa;Password=asdasd;"- or -"Server=Aron1;Database=pubs;UserID=sa;Password=asdasd;Trusted_Connection=False"(both connection strings produces the same result)Trusted Connection:"Data Source=Aron1;Initial Catalog=pubs;Integrated Security=SSPI;"- or -"Server=Aron1;Database=pubs;Trusted_Connection=True;"(both connection strings produces the same result)(use serverName\instanceName as Data Source to use an specifik SQLServer instance, only SQLServer2000)Connect via an IP address:"Data Source=190.190.200.100,1433;Network Library=DBMSSOCN;Initial Catalog=pubs;User ID=sa;Password=asdasd;"(DBMSSOCN=TCP/IP instead of Named Pipes, at the end of the Data Source is the port to use (1433 is the default))Declare the SqlConnection:C#:using System.Data.SqlClient;SqlConnection oSQLConn = new SqlConnection(); oSQLConn.ConnectionString="my connection string"; oSQLConn.Open();:Imports System.Data.SqlClientDim oSQLConn As SqlConnection = New SqlConnection() oSQLConn.ConnectionString="my connection string" oSQLConn.Open()Data ShapeMS Data Shape"Provider=MSDataShape;Data Provider=SQLOLEDB;Data Source=Aron1;Initial Catalog=pubs;User ID=sa;Password=asdasd;"Want to learn data shaping? Check out 4GuyfFromRolla's great article about Data Shaping >>Read moreHow to define which network protocol to useExample:"Provider=sqloledb;DataSource=190.190.200.100,1433;NetworkLibrary=DBMSSOCN;Initial Catalog=pubs;User ID=sa;Password=asdasd;"Name Network librarydbnmpntw Win32 Named Pipesdbmssocn Win32 Winsock TCP/IPdbmsspxn Win32 SPX/IPXdbmsvinn Win32 Banyan Vinesdbmsrpcn Win32 Multi-Protocol (Windows RPC)Important note!When connecting through the SQLOLEDB provider use the syntax Network Library=dbmssocnand when connecting through MSDASQL provider use the syntax Network=dbmssocnAll SqlConnection connection string propertiesThis table shows all connection string properties for the SqlConnection object. Most of the properties are also used in ADO. All properties and descriptions is from msdn.Name Default DescriptionApplication Name The name of the application, or '.Net SqlClient Data Provider' if no application name is provided.AttachDBFilename-or-extended properties-or-Initial File Name The name of the primary file, including the full path name, of an attachable database. The database name must be specified with the keyword 'database'.Connect Timeout-or-Connection Timeout 15 The length of time (in seconds) to wait for a connection to the server before terminating the attempt and generating an error.Connection Lifetime 0 When a connection is returned to the pool, its creation time is compared with the current time, and the connection is destroyed if that time span (in seconds) exceeds the value specified by connection lifetime. Useful in clustered configurations to force load balancing between a running server and a server just brought on-line.Connection Reset 'true' Determines whether the database connection is reset when being removed from the pool. Setting to 'false' avoids making an additional server round-trip when obtaining a connection, but the programmer must be aware thatthe connection state is not being reset.Current Language The SQL Server Language record name.Data Source-or-Server-or-Address-or-Addr-or-Network Address The name or network address of the instance of SQL Server to which to connect.Enlist 'true' When true, the pooler automatically enlists the connection in the creation thread's current transaction context.Initial Catalog-or-Database The name of the database.Integrated Security-or-Trusted_Connection 'false' Whether the connection is to be a secure connection or not. Recognized values are 'true', 'false', and 'sspi', which is equivalent to 'true'.Max Pool Size 100 The maximum number of connections allowed in the pool.Min Pool Size 0 The minimum number of connections allowed in the pool.Network Library-or-Net 'dbmssocn' The network library used to establish a connection to an instance of SQL Server. Supported values include dbnmpntw (Named Pipes), dbmsrpcn (Multiprotocol), dbmsadsn (Apple Talk), dbmsgnet (VIA), dbmsipcn (Shared Memory) and dbmsspxn (IPX/SPX), and dbmssocn (TCP/IP).The corresponding network DLL must be installed on the system to which you connect. If you do not specify a network and you use a local server (for example, "." or "(local)"), shared memory is used.Packet Size 8192 Size in bytes of the network packets used to communicate with an instance of SQL Server.Password-or-Pwd The password for the SQL Server account logging on.Persist Security Info 'false' When set to 'false', security-sensitive information, such as the password, is not returned as part of the connection if the connection is open or has ever been in an open state. Resetting the connection string resets all connection string values including the password.Pooling 'true' When true, the SQLConnection object is drawn from the appropriate pool, or if necessary, is created and added to the appropriate pool.User ID The SQL Server login account.Workstation ID the local computer name The name of the workstation connecting to SQL Server.NoteUse ; to separate each property.If a name occurs more than once, the value from the last one in the connection string will be used.If you are building your connection string in your app using values from user input fields, make sure the user can't change the connection string by inserting an additional property with another value within the user value.SQL Server 2005SQL Native Client ODBC DriverStandard security:"Driver={SQL Native Client};Server=Aron1;Database=pubs;UID=sa;PWD=asdasd;"Trusted connection:"Driver={SQL Native Client};Server=Aron1;Database=pubs;Trusted_Connection=yes;"EquivalentsIntegrated Security=SSPI equals Trusted_Connection=yesPrompt for username and password:oConn.Properties("Prompt") = adPromptAlwaysoConn.Open "Driver={SQL Native Client};Server=Aron1;DataBase=pubs;"Enabling MARS (multiple active result sets):"Driver={SQL Native Client};Server=Aron1;Database=pubs;Trusted_Connection=yes; MARS_Connection=yes"EquivalentsMultipleActiveResultSets=true equals MARS_Connection=yesUsing MARS with SQL Native Client, by Chris Lee >>Encrypt data sent over network:"Driver={SQL Native Client};Server=Aron1;Database=pubs;Trusted_Connection=yes;E ncrypt=yes"Attach a database file on connect to a local SQL Server Express instance:"Driver={SQL Native Client};Server=.\SQLExpress;AttachDbFilename=c:\asd\qwe\myd bfile.mdf;Database=dbname;Trusted_Connection=Yes;"- or -"Driver={SQL Native Client};Server=.\SQLExpress;AttachDbFilename=|DataDirectory| mydbfile.mdf;Database=dbname;Trusted_Connection=Yes;"(use |DataDirectory| when your database file resides in the data directory)Why is the "Database" parameter needed? Answer: If the database was previously attached, SQL Server does not reattach it (it uses the attached database as the default for the connection).Download the SQL Native Client here >> (the package contains booth the ODBC driver and the OLE DB provider)Using SQL Server 2005 Express? Don't miss the server name syntax: SERVERNAME\SQLEXPRESS (Substitute "SERVERNAME" with the name of the computer)SQL Native Client OLE DB ProviderStandard security:"Provider=SQLNCLI;Server=Aron1;Database=pubs;UID=sa;P WD=asdasd;"Trusted connection:"Provider=SQLNCLI;Server=Aron1;Database=pubs;Trusted_ Connection=yes;"EquivalentsIntegrated Security=SSPI equals Trusted_Connection=yesPrompt for username and password:oConn.Properties("Prompt") = adPromptAlwaysoConn.Open"Provider=SQLNCLI;Server=Aron1;DataBase=pubs;"Enabling MARS (multiple active result sets):"Provider=SQLNCLI;Server=Aron1;Database=pubs;Trusted_Connection=yes;MarsConn=yes"EquivalentsMarsConn=yes equals MultipleActiveResultSets=true equals MARS_Connection=yesUsing MARS with SQL Native Client, by Chris Lee >>Encrypt data sent over network:"Provider=SQLNCLI;Server=Aron1;Database=pubs;Trusted_ Connection=yes;Encrypt=yes"Attach a database file on connect to a local SQL Server Express instance:"Provider=SQLNCLI;Server=.\SQLExpress;AttachDbFilename =c:\asd\qwe\mydbfile.mdf;Database=dbname;Trusted_Connecti on=Yes;"- or -"Provider=SQLNCLI;Server=.\SQLExpress;AttachDbFilename =|DataDirectory|mydbfile.mdf;Database=dbname;Trusted_Conn ection=Yes;"(use |DataDirectory| when your database file resides in thedata directory)Why is the "Database" parameter needed? Answer: If the database was previously attached, SQL Server does not reattach it (it uses the attached database as the default for the connection).Download the SQL Native Client here >> (the package contains booth the ODBC driver and the OLE DB provider)Using SQL Server 2005 Express? Don't miss the server name syntax: SERVERNAME\SQLEXPRESS (Substitute "SERVERNAME" with the name of the computer)SqlConnection (.NET)Standard Security:"Data Source=Aron1;Initial Catalog=pubs;User Id=sa;Password=asdasd;"- or -"Server=Aron1;Database=pubs;UserID=sa;Password=asdasd;Trusted_Connection=False"(both connection strings produces the same result)Trusted Connection:"Data Source=Aron1;Initial Catalog=pubs;Integrated Security=SSPI;"- or -"Server=Aron1;Database=pubs;Trusted_Connection=True;"(both connection strings produces the same result)(use serverName\instanceName as Data Source to use an specifik SQLServer instance)Connect via an IP address:"Data Source=190.190.200.100,1433;Network Library=DBMSSOCN;Initial Catalog=pubs;User ID=sa;Password=asdasd;"(DBMSSOCN=TCP/IP instead of Named Pipes, at the end of the Data Source is the port to use (1433 is the default))Enabling MARS (multiple active result sets):"Server=Aron1;Database=pubs;Trusted_Connection=True;M ultipleActiveResultSets=true"Note! Use 2.0 for MARS functionality. MARS is not supported in 1.0 nor 1.1Streamline your Data Connections by Moving to MARS, by Laurence Moroney, >>Attach a database file on connect to a local SQL Server Express instance:"Server=.\SQLExpress;AttachDbFilename=c:\asd\qwe\mydb file.mdf;Database=dbname;Database=dbname;Trusted_Connect ion=Yes;"- or -"Server=.\SQLExpress;AttachDbFilename=|DataDirectory|m ydbfile.mdf;Database=dbname;Trusted_Connection=Yes;"(use |DataDirectory| when your database file resides in the data directory)Why is the "Database" parameter needed? Answer: If the database was previously attached, SQL Server does not reattach it (it uses the attached database as the default for the connection).Using "User Instance" on a local SQL Server Express instance:"Data Source=.\SQLExpress;integrated security=true;attachdbfilename=|DataDirectory|\mydb.mdf;user instance=true;"The "User Instance" functionality creates a new SQL Server instance on the fly during connect. This works only on a local SQL Server 2005 instance and only when connecting using windows authentication over local named pipes. The purpose is to be able to create a full rights SQL Server instance to a user with limited administrative rights on the computer. To enable the functionality: sp_configure 'user instances enabled','1' (0 to disable)Using SQL Server 2005 Express? Don't miss the server name syntax: SERVERNAME\SQLEXPRESS (Substitute "SERVERNAME" with the name of the computer)Context Connection - connecting to "self" from within your CLR stored prodedure/functionC#:using(SqlConnection connection = new SqlConnection("context connection=true")){connection.Open();// Use the connection}Visual Basic:Using connection as new SqlConnection("context connection=true")connection.Open()' Use the connectionEnd UsingThe context connection lets you execute Transact-SQL statements in the same context (connection) that your code was invoked in the first place.Read moreWhen to use SQL Native Client?.Net applicationsDo not use the SQL Native Client. Use the .NET Framework Data Provider for SQL Server (SqlConnection).COM applications, all other then .NET applicationsUse the SQL Native Client if you are accessing an SQL Server 2005 and need the new features of SQL Server 2005 such as MARS, encryption, XML data type etc. Continue use your current provider (OLE DB / ODBC through the MDAC package) if you are not connecting to an SQL Server 2005 (that's quite obvious eh..) or if you are connecting to an SQL Server 2005 but are not using any of the new SQL Server 2005 features.For more details on the differences between MDAC and SQL Native Client, read this msdn article >>AccessODBCStandard Security:"Driver={Microsoft Access Driver (*.mdb)};Dbq=C:\mydatabase.mdb;Uid=Admin;Pwd=;"Workgroup:"Driver={Microsoft Access Driver (*.mdb)};Dbq=C:\mydatabase.mdb;SystemDB=C:\mydatabase.m dw;"Exclusive:"Driver={Microsoft Access Driver (*.mdb)};Dbq=C:\mydatabase.mdb;Exclusive=1;Uid=admin;Pwd ="OLE DB, OleDbConnection (.NET)Standard security:"Provider=Microsoft.Jet.OLEDB.4.0;DataSource=\somepath\mydb.mdb;User Id=admin;Password=;"Workgroup (system database):"Provider=Microsoft.Jet.OLEDB.4.0;DataSource=\somepath\mydb.mdb;Jet OLEDB:System Database=system.mdw;"With password:"Provider=Microsoft.Jet.OLEDB.4.0;DataSource=\somepath\mydb.mdb;Jet OLEDB:Database Password=MyDbPassword;"OracleODBCNew version:"Driver={Microsoft ODBC for Oracle};Server=OracleServer.world;Uid=Username;Pwd=asdasd; "Old version:"Driver={Microsoft ODBC Driver for Oracle};ConnectString=OracleServer.world;Uid=myUsername;Pw d=myPassword;"OLE DB, OleDbConnection (.NET)Standard security:"Provider=msdaora;Data Source=MyOracleDB;User Id=UserName;Password=asdasd;"This one's from Microsoft, the following are from OracleStandard Security:"Provider=OraOLEDB.Oracle;Data Source=MyOracleDB;User Id=Username;Password=asdasd;"Trusted Connection:"Provider=OraOLEDB.Oracle;DataSource=MyOracleDB;OSAuthent=1;"OracleConnection (.NET)Standard:"Data Source=MyOracleDB;Integrated Security=yes;"This one works only with Oracle 8i release 3 or laterSpecifying username and password:"Data Source=MyOracleDB;User Id=username;Password=passwd;Integrated Security=no;"This one works only with Oracle 8i release 3 or laterDeclare the OracleConnection:C#:using System.Data.OracleClient;OracleConnection oOracleConn = new OracleConnection();oOracleConn.ConnectionString = "my connection string";oOracleConn.Open();:Imports System.Data.OracleClientDim oOracleConn As OracleConnection = New OracleConnection()oOracleConn.ConnectionString = "my connection string"oOracleConn.Open()Missing the System.Data.OracleClient namespace? Download .NET Managed Provider for Oracle >>Great article! "Features of Oracle Data Provider for .NET" by Rama Mohan G. at C# CornerCore Labs OraDirect (.NET)Standard:"User ID=scott; Password=tiger; Host=ora; Pooling=true; Min Pool Size=0;Max Pool Size=100; Connection Lifetime=0"Read more at Core Lab and the product page.Data ShapeMS Data Shape:"Provider=MSDataShape.1;Persist Security Info=False;Data Provider=MSDAORA;Data Source=orac;user id=username;password=mypw"Want to learn data shaping? Check out 4GuyfFromRolla's great article about Data Shaping >>MySQLMyODBCMyODBC 2.50 Local database:"Driver={mySQL};Server=localhost;Option=16834;Database =mydatabase;"MyODBC 2.50 Remote database:"Driver={mySQL};Server=;Port=3306;Optio n=131072;Stmt=;Database=my-database;Uid=username;Pwd=password;"MyODBC 3.51 Local database:"DRIVER={MySQL ODBC 3.51 Driver};SERVER=localhost;DATABASE=myDatabase;USER=myUs ername;PASSWORD=myPassword;OPTION=3;"MyODBC 3.51 Remote database:"DRIVER={MySQL ODBC 3.51 Driver};SERVER=;PORT=3306;DATABASE=myD atabase;USER=myUsername;PASSWORD=myPassword;OPTION=3;"OLE DB, OleDbConnection (.NET)Standard:"Provider=MySQLProv;Data Source=mydb;User Id=UserName;Password=asdasd;"Connector/Net 1.0 (.NET)Standard:"Server=Server;Database=Test;Uid=UserName;Pwd=asdasd ;"Download the driver at MySQL Developer Zone.Specifying port:"Server=Server;Port=1234;Database=Test;Uid=UserName;P wd=asdasd;"Default port is 3306. Enter value -1 to use a named pipe connection.Declare the MySqlClient connection:C#:using MySql.Data.MySqlClient;MySqlConnection oMySqlConn = new MySqlConnection();oMySqlConn.ConnectionString = "Server=Server;Database=Test;Uid=UserName;Pwd=asdasd;";oMySqlConn.Open();:Imports MySql.Data.MySqlClientDim oMySqlConn As MySqlConnection = New MySqlConnection()oMySqlConn.ConnectionString = "Server=Server;Database=Test;Uid=UserName;Pwd=asdasd;"oMySqlConn.Open()MySqlConnection (.NET)eInfoDesigns.dbProvider:"Data Source=server;Database=mydb;User ID=username;Password=pwd;Command Logging=false"This one is used with eInfoDesigns dbProvider, an add-on to .NETDeclare the MySqlConnection:C#:using eInfoDesigns.dbProvider.MySqlClient;MySqlConnection oMySqlConn = new MySqlConnection();oMySqlConn.ConnectionString = "my connection string";oMySqlConn.Open();:Imports eInfoDesigns.dbProvider.MySqlClientDim oMySqlConn As MySqlConnection = New MySqlConnection()oMySqlConn.ConnectionString = "my connection string"oMySqlConn.Open()SevenObjects MySqlClient (.NET)Standard:"Host=server; UserName=myusername; Password=mypassword;Database=mydb;"This is a freeware data provider from SevenObjectsCore Labs MySQLDirect (.NET)Standard:"User ID=root; Password=pwd; Host=localhost; Port=3306; Database=test;Direct=true; Protocol=TCP; Compress=false; Pooling=true; Min Pool Size=0;Max Pool Size=100; Connection Lifetime=0"Read more at Core Lab and the product page.InterbaseODBC, EasysoftLocal computer:"Driver={Easysoft IB6 ODBC};Server=localhost;Database=localhost:C:\mydatabase.gd b;Uid=username;Pwd=password"Remote Computer:"Driver={Easysoft IB6 ODBC};Server=ComputerName;Database=ComputerName:C:\m ydatabase.gdb;Uid=username;Pwd=password"Read more about this driver: Easysoft ODBC-Interbase driver >>ODBC, IntersolvLocal computer:"Driver={INTERSOLV InterBase ODBC Driver (*.gdb)};Server=localhost;Database=localhost:C:\mydatabase.gd b;Uid=username;Pwd=password"Remote Computer:"Driver={INTERSOLV InterBase ODBC Driver (*.gdb)};Server=ComputerName;Database=ComputerName:C:\ mydatabase.gdb;Uid=username;Pwd=password"This driver are provided by DataDirect Technologies >> (formerly Intersolv)OLE DB, SIBPROviderStandard:"provider=sibprovider;location=localhost:;datasource=c:\databases\gdbs\mygdb.gdb;userid=SYSDBA;password=masterkey"Specifying character set:"provider=sibprovider;location=localhost:;datasource=c:\databases\gdbs\mygdb.gdb;userid=SYSDBA;password=masterkey;character set=ISO8859_1"Specifying role:"provider=sibprovider;location=localhost:;datasource=c:\databases\gdbs\mygdb.gdb;userid=SYSDBA;password=masterkey;role=DIGITADORES"Read more about SIBPROvider >>Read more about connecting to Interbase in this Borland Developer Network articleIBM DB2OLE DB, OleDbConnection (.NET) from msTCP/IP:"Provider=DB2OLEDB;Network TransportLibrary=TCPIP;Network Address=XXX.XXX.XXX.XXX;Initial Catalog=MyCtlg;Package Collection=MyPkgCol;Default Schema=Schema;User ID=MyUser;Password=MyPW"APPC:"Provider=DB2OLEDB;APPC Local LU Alias=MyAlias;APPC Remote LU Alias=MyRemote;Initial Catalog=MyCtlg;Package Collection=MyPkgCol;Default Schema=Schema;User ID=MyUser;Password=MyPW"IBM's OLE DB Provider (shipped with IBM DB2 UDB v7 or above)TCP/IP:Provider=IBMDADB2;Database=sample;HOSTNAME=db2h ost;PROTOCOL=TCPIP;PORT=50000;uid=myUserName;pwd=my Pwd;ODBCStandard:"driver={IBM DB2 ODBC DRIVER};Database=myDbName;hostname=myServerName;port =myPortNum;protocol=TCPIP; uid=myUserName; pwd=myPwd"SybaseODBCStandard Sybase System 12 (or 12.5) Enterprise Open Client:"Driver={SYBASE ASE ODBC Driver};Srvr=Aron1;Uid=username;Pwd=password"Standard Sybase System 11:"Driver={SYBASE SYSTEM 11};Srvr=Aron1;Uid=username;Pwd=password;Database=mydb "For more information check out the Adaptive ServerEnterprise Document SetsIntersolv 3.10:"Driver={INTERSOLV 3.10 32-BIT Sybase};Srvr=Aron1;Uid=username;Pwd=password;"Sybase SQL Anywhere (former Watcom SQL ODBC driver):"ODBC; Driver=Sybase SQL Anywhere 5.0; DefaultDir=c:\dbfolder\;Dbf=c:\mydatabase.db;Uid=username;P wd=password;Dsn="""""Note! The two double quota following the DSN parameter at the end are escaped quotas (VB syntax), you may have to change this to your language specific escape syntax. The empty DSN parameter is indeed critical as not including it will result in error 7778.Read more in the Sybase SQL Anywhere User Guide (see part 3, chapter 13) >>OLE DBAdaptive Server Anywhere (ASA):"Provider=ASAProv;Data source=myASA"Read more in the ASA User Guide (part 1, chapter 2) >>Adaptive Server Enterprise (ASE) with Data Source .IDS file:"Provider=Sybase ASE OLE DB Provider; Data source=myASE"Note that you must create a Data Source .IDS file using the Sybase Data Administrator. These .IDS files resemble ODBC DSNs.Adaptive Server Enterprise (ASE):"Provider=Sybase.ASEOLEDBProvider;Srvr=myASEserver,50 00;Catalog=myDBname;UserId=username;Password=password"- some reports on problem using the above one, try the following as an alternative -"Provider=Sybase.ASEOLEDBProvider;ServerName=myASEserver,5000;Initial Catalog=myDBname;User Id=username;Password=password"This one works only from Open Client 12.5 where the server port number feature works,燼llowing fully qualified connection strings to be used without defining燼ny .IDS Data Source files.AseConnection (.NET)Standard:"DataSource='myASEserver';Port=5000;Database='myDBname';UID=' username';PWD='password';"Declare the AseConnection:C#:using Sybase.Data.AseClient;AseConnection oCon = new AseConnection();oCon.ConnectionString="my connection string";oCon.Open();:Imports System.Data.AseClientDim oCon As AseConnection = New AseConnection()oCon.ConnectionString="my connection string"oCon.Open()Read more! Adaptive Server Enterprise Data Provider Documentation >>InformixODBCInformix 3.30:"Dsn='';Driver={INFORMIX 3.30 32 BIT};Host=hostname;Server=myserver;Service=service-name;Protocol=olsoctcp;Database=mydb;UID=username;PWD= myPwdInformix-CLI 2.5:"Driver={Informix-CLI 2.5 (32Bit)};Server=myserver;Database=mydb;Uid=username;Pwd=my Pwd"OLE DBIBM Informix OLE DB Provider:"Provider=Ifxoledbc.2;password=myPw;UserID=myUser;Data Source=dbName@serverName;Persist Security Info=true"IngresODBCDSN-less"Provider=MSDASQL.1;DRIVER=Ingres;SRVR=xxxxx;DB=xxx xx;Persist Security Info=False;uid=xxxx;pwd=xxxxx;SELECTLOOPS=N;Extended Properties="""SERVER=xxxxx;DATABASE=xxxxx;SERVERTYPE=IN GRES""Mimer SQLODBCStandard Security:"Driver={MIMER};Database=mydb;Uid=myuser;Pwd=mypw; "Prompt for username and password:"Driver={MIMER};Database=mydb;"LightbaseStandardStandard:"user=USERLOGIN;password=PASSWORD;UDB=USERBASE; server=SERVERNAME"PostgreSQLCore Labs PostgreSQLDirect (.NET)Standard:"User ID=root; Password=pwd; Host=localhost; Port=5432; Database=testdb;Pooling=true; Min Pool Size=0; Max Pool Size=100; Connection Lifetime=0"Read more at Core Lab and the product page.PostgreSQL driverStandard:"DRIVER={PostgreSQL};SERVER=ipaddress;port=5432;DATA BASE=dbname;UID=username;PWD=password;"Npgsql by pgFoundry (.NET)SSL activated:"Server=127.0.0.1;Port=5432;Userid=myuserid;password=m ypw;Protocol=3;SSL=true;Pooling=true;MinPoolSize=3;MaxPool Size=20;Encoding=UNICODE;Timeout=20;SslMode=Require"Without SSL:"Server=127.0.0.1;Port=5432;Userid=myuserid;password=m ypw;Protocol=3;SSL=false;Pooling=true;MinPoolSize=1;MaxPoo lSize=20;Encoding=UNICODE;Timeout=15;SslMode=Disable"Read more in the Npgsql: User's Manual and on the pgFoundry website.ParadoxODBC5.X:Driver={Microsoft Paradox Driver (*.db )};DriverID=538;Fil=Paradox 5.X;DefaultDir=c:\pathToDb\;Dbq=c:\pathToDb\;CollatingSeque nce=ASCII"7.X:"Provider=MSDASQL.1;Persist Security Info=False;Mode=Read;ExtendedProperties='DSN=Paradox;DBQ=C:\myDb;DefaultDir=C:\myDb; DriverId=538;FIL=Paradox7.X;MaxBufferSize=2048;PageTimeout=600;';InitialCatalog=C:\myDb"OleDbConnection (.NET)Standard"Provider=Microsoft.Jet.OLEDB.4.0;DataSource=c:\myDb;Extended Properties=Paradox 5.x;"。

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一.数据库的连接字符串string connectionstr = "Data Source=PC201305072142\\SQLEXPRESS;Da taBase=db_stu;User ID=sa;pwd=123456";Data Source后加你的连接服务器,DataBase后加连接的数据库ID=sa;pwd=123456ID:用户名Pwd:密码二.C#语言实现SQL SERVER、access连接SQL SERVER:添加 using System.Data.SqlClient;SqlConnection con =new SqlConnection("server=.;database=数据库名;uid=sa;pwd=密码");//密码是你数据库sa的登录的密码或者是 SqlConnection con = new SqlConnection("Data source=你的数据库服务器;Initial Catalog=要连接的数据库名;trusetd_connection=sspi");//c是window身份认证的方式access:添加using System.Data.OleDb;OleDbConnection omd=newOleDbConnection("Provider=Microsoft.jet.oldb.4.0;database=数据库的相对路径");//路径是想对你程序运行的路径三.问:如何手动设置数据库连接(数据库的IP、登录密码、用户名称以让用户自己输入一次,然后把它们保存到配置文件中,以后就不需要再输了,直接从配置文件中读取就行了)答:1、在解决方案中添加一个新的类,命名CL_Conn,用于连接数据库。

完整代码如下:using System;using System.Collections.Generic;using ponentModel;using System.Text;using System.Windows.Forms;using Microsoft.Data.ConnectionUI;namespace CL_Conn{public class Conn{/// <summary>/// 获取 自带的数据库连接对话框的数据库连接信息/// </summary>/// <returns>数据库连接</returns>public string GetDatabaseConnectionString(){string connString = String.Empty;Microsoft.Data.ConnectionUI.DataConnectionDialog connDialog = new Microsoft.Data.ConnectionUI.DataConnectionDialog();// 添加数据源列表,可以向窗口中添加自己程序所需要的数据源类型必须增加以下几项中任一一项connDialog.DataSources.Add(Microsoft.Data.ConnectionUI.DataSource.AccessDataSo urce); // AccessconnDialog.DataSources.Add(Microsoft.Data.ConnectionUI.DataSource.OdbcDataSou rce); // ODBCconnDialog.DataSources.Add(Microsoft.Data.ConnectionUI.DataSource.OracleDataSo urce); // OracleconnDialog.DataSources.Add(Microsoft.Data.ConnectionUI.DataSource.SqlDataSourc e); // Sql ServerconnDialog.DataSources.Add(Microsoft.Data.ConnectionUI.DataSource.SqlFileDataSo urce); // Sql Server File// 初始化connDialog.SelectedDataSource =Microsoft.Data.ConnectionUI.DataSource.SqlDataSource;connDialog.SelectedDataProvider =Microsoft.Data.ConnectionUI.DataProvider.SqlDataProvider;//只能够通过DataConnectionDialog类的静态方法Show出对话框//不同使用dialog.Show()或dialog.ShowDialog()来呈现对话框if(Microsoft.Data.ConnectionUI.DataConnectionDialog.Show(connDialog) == DialogResult.OK){connString = connDialog.ConnectionString;}return connString;}}}2、编译。

然后将成的DLL文件在主启动程序(即调用程序)的引用中添加。

3、在程序中添加引用类。

完整代码如下:using System;using System.Collections.Generic;using System.Text;using System.Data.SqlClient;using System.Windows.Forms;namespace _0090705{class Conn{/// <summary>////// </summary>/// <returns></returns>public SqlConnection creatConn(){string connection = string.Empty;CL_Conn.Conn conn = new CL_Conn.Conn();connection = conn.GetDatabaseConnectionString();//SqlConnection thisConnection = new SqlConnection("Data Source = HZAU-XIEYAO\\SQLEXPRESS;Initial Catalog = DayDay;User ID = sa;Password = 200100");SqlConnection thisConnection = new SqlConnection("" + connection + "");try{thisConnection.Open();}catch (Exception ex){MessageBox.Show(ex.ToString());}return thisConnection;}}}4、或者直接添加应用类的方法[DllImport("CL_Conn.dll")]static extern Form Conn();private void 连接数据库ToolStripMenuItem_Click(object sender, EventArgs e){CL_Conn.Conn conn = new CL_Conn.Conn();conn.GetDatabaseConnectionString();}四. 问:Asp access据库连接设置答:<%@LANGUAGE="VBSCRIPT" CODEPAGE="936"%><%option explicitdim conn,connstr,db'更改数据库名字db="data/xxlyw.mdb"Set conn = Server.CreateObject("ADODB.Connection")connstr="Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" &Server.MapPath(db)conn.Open connstrfunction CloseDatabaseConn.closeSet conn = NothingEnd Function%>五.问: ASP中如何快速的创建数据库连接(打算要建立一个动态的新闻发布效果,请高手指教.现在有一百积分,就恳请答谢各位啊!恳请尽量详细一点)答:数据连接:假设在当前目录下有个文件夹data,里面有个数据库data.mdb<%dbSys="data/data.mdb"ConnSysStr = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" & Server.MapPath(dbSys)On Error Resume NextSet conn = Server.CreateObject("ADODB.Connection")conn.open connSysStrIf Err Thenerr.ClearSet Conn = NothingResponse.Write Now()&"<br/><br/>连接失败..."Response.EndEnd If%>如果连接成功了,就可以操作数据库。

假设有个表userForm,里面有字段username,password<%set rs=conn.execute("select * from u serForm")if not rs.eof thenresponse.write "用户名:"& rs("username")response.write " 密码:"& rs("password")end ifrs.close%>具体的可以参考别人的代码。

asp源码可以到以下网站下六.问:数据库连接答:string settings =Convert.ToString(ConfigurationManager.ConnectionStrings["newsBiomensCo nn"]); //读取数据库连接字符串OleDbConnection myconn = newOleDbConnection(settings); //创建数据库连接对象myconn.Open(); //打开数据库连接//创建SQL语句string account = tbAccount.Text;string psw = tbRepwd.Text;string name = tbName.Text;string sex = rblSex.Text.ToString();string card = tbIDcard.Text;string answer = tbAnswer.Text;DateTime newsDate = DateTime.Now;string strsql = "insert intoUsers(UserAccount,Password,UserName,UserSex,IDcard,Answer,UserAddData) values (";strsql = strsql + "'" + account + "','" + psw + "','" + name + "','" + sex + "','" + card + "','" + answer + "','" + newsDate + "')";//创建数据库命令OleDbCommand mycmd = new OleDbCommand(strsql, myconn);//测试语句//Response.Write(strsql);//Response.End();mycmd.ExecuteNonQuery();//关闭数据库myconn.Close();报错说是inert into语法错误string strsql = "insert intoUsers(UserAccount,Password,UserName,UserSex,IDcard,Answer,UserAddData) values (";strsql = strsql + "'" + account + "','" + psw + "','" + name + "','" + sex + "','" + card + "','" + answer + "','" + newsDate + "')";改成string strsql = "insert into[Users]([UserAccount],[Password],[UserName],[UserSex],[IDcard],[Answe r],[UserAddData]) values (";strsql = strsql + "'" + account + "','" + psw + "','" + name + "','" + sex + "','" + card + "','" + answer + "','" + newsDate + "')";里面的password是保留字不可直接使用,其它的也许也有保留字,于是全部都给它加上[]七. 问:网页怎么与数据库连接(我用VS2005建立了2个网页一个是DEFAULT.ASPX,一个是LOGIN.aspx,我现在想用login.aspx连接一个数据库,请问怎么用login.aspx与服务器资源管理器的数据库连接,不要只告诉我代码我想知道代码应该放在哪里,才能实现我通过login.aspx注册用户名,可以在default.aspx中登录)答:login.aspx文件的内容:<body><form id="form1" runat="server"><div>用户登录<br /><br />用户名:<asp:TextBox ID="userName" runat="server"></asp:TextBox><br />密码:<asp:TextBox ID="passWord" runat="server"TextMode="Password"></asp:TextBox><br /><asp:Button ID="loginSubmit" runat="server" Text="登录"onclick="loginSubmit_Click" /></div></form></body>这个没什么说的就是两个输入框一个登录按钮。

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