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数据库连接字符串中的“

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Jun 07, 2016 pm 03:29 PM

asp.netstringdatabaseconnect

asp.net 2.0有一个特殊目录app_data,通常Sql server 2005 express数据文件就放在这个目录，相应的数据库连接串就是： connectionString=…… data source=.\SQLEXPRESS;Integrated Security=SSPI;AttachDBFilename=|DataDirectory|data.mdf;User Instance=tr

asp.net 2.0有一个特殊目录app_data,通常Sql server 2005 express数据文件就放在这个目录，相应的数据库连接串就是：
connectionString="…… data source=.\SQLEXPRESS;Integrated Security=SSPI;AttachDBFilename=|DataDirectory|data.mdf;User Instance=true"
这里有一个DataDirectory的宏，他表示什么意义呢？

DataDirectory 是表示数据库路径的替换字符串。由于无需对完整路径进行硬编码，DataDirectory 简化了项目的共享和应用程序的部署。例如，无需使用以下连接字符串：
"Data Source= c:\program files\MyApp\app_data\Mydb.mdf"
通过使用 |DataDirectory|（包含在如下所示的竖线中），即可具有以下连接字符串：
"Data Source = |DataDirectory|\Mydb.mdf"
这里的一篇文章Working with local databases详细的解释了DataDirectory 的意义，不仅仅是Sql server 2005 express中使用，也可以在其他的文件数据库中使用，例如Sqllite数据库文件的连接字符串：
connectionString="DriverClass=NHibernate.Driver.SQLite20Driver;Dialect=NHibernate.Dialect.SQLiteDialect;Data Source=|DataDirectory|\data.db3" />

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