ASP.NET web.config里 <connectionStrings>关键字简介_applicationservices" connectionstring 本机-优快云博客

本文链接：https://blog.youkuaiyun.com/jiangshaolu/article/details/8158413

本文介绍了ASP.NET中<connectionStrings>元素的基本用法，特别是<add>标签的详细配置，包括data source、providerName等参数的含义，以及如何设置连接字符串。

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一 <connectionString>

</connectionString>

常见的写法如下

<connectionStrings>
<add name="ApplicationServices"

connectionString="data source=.\SQLEXPRESS;Integrated Security=SSPI;User Instance=true"

providerName="System.Data.SqlClient" />
</connectionStrings>

各个参数的解释如下 name="ApplicationServices" ,name代表connectionString的名字

这个是用来写链接数据库的语句的，例如，你的add name=“ApplicationServices”，那么你在链接数据库的时候直接链ApplicationServices，就不用写链接数据库的那么长的语句了。 
完整的语句是：<add name="ApplicationServices" connectionString="写你的数据库链接语句" />

在你用的时候定义个变量，
例如：connectionstring，则：connectionstring = ConfigurationManager.ConnectionString["ApplicationServices"].ConnectionString;
这样你链接数据库的时候直接用connectionstring 就OK。

connectionString 数据库连接串

providerName 使用的是什么类型的数据库，例如System.Data.SqlClient ，System.Data.OracleClient

providerName 指定值“System.Data.OracleClient”，该值指定 ASP.NET 在使用此连接字符串进行连接时应使用 ADO.NET System.Data.OracleClient 提供程序。

二

1.<connectionStrings>
<connectionStrings>
<add name="ConnectionStringName" connectionString=" Data Source=服务器名;Initial Catalog=数据库名;User ID=用户;Password=密码"
providerName="System.Data.SqlClient" />
</connectionStrings>

或是

<connectionStrings>
<add name="ConnectionStringName" connectionString="sever=服务器名;database=数据库名;User ID=用户;Password=密码"
providerName="System.Data.SqlClient" />
</connectionStrings>

在 <connectionStrings> 里,在页面还可以这样引用<%$ ConnectionString:Name%>.

三外文解释

Name	Default	Description
Application 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. If this setting is specified, the `Initial` `Catalog` setting must also be specified. The database name must be specified with the keyword 'database'. Example: Data Source=.; Initial Catalog=; Integrated Security=true;AttachDBFileName=c:\MyFolder\MyDb.mdf Update: You can use the following syntax to attach a database that lives in your "Data" directory: AttachDBFileName=\|DataDirectory\|MyDb.mdf
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.
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.
Encrypt	'false'	When true, SQL Server uses SSL encryption for all data sent between the client and server if the server has a certificate installed. Recognized values are true, false, yes, and no.
Initial Catalog -or- Database		The name of the database.
Integrated Security -or- Trusted_Connection	'false'	When false, User ID and Password are specified in the connection. When true, the current Windows account credentials are used for authentication. Recognized values are true, false, yes, no, and sspi (strongly recommended), which is equivalent to true.
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), dbmslpcn (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 (Not recommended. To maintain a high level of security, it is strongly recommended that you use the Integrated Security or Trusted_Connection keyword instead.).
Persist Security Info	'false'	When set to false or no (strongly recommended), 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. Recognized values are true, false, yes, and no.
User ID		The SQL Server login account (Not recommended. To maintain a high level of security, it is strongly recommended that you use the Integrated Security or Trusted_Connection keyword instead.).
Workstation ID	the local computer name	The name of the workstation connecting to SQL Server.
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. This is useful in clustered configurations to force load balancing between a running server and a server just brought online. A value of zero (0) causes pooled connections to have the maximum connection timeout.
Connection Reset	'true'	Determines whether the database connection is reset when being drawn from the pool. For Microsoft SQL Server version 7.0, setting to false avoids making an additional server round trip when obtaining a connection, but you must be aware that the connection state, such as database context, is not being reset.
Enlist	'true'	When true, the pooler automatically enlists the connection in the creation thread's current transaction context. Recognized values are true, false, yes, and no.
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.
Pooling	'true'	When true, the SQLConnection object is drawn from the appropriate pool, or if necessary, is created and added to the appropriate pool. Recognized values are true, false, yes, and no.