一、SQLServer 链接异常  1.使用 .Net Framework链接数据库异常内容： An exception of type System.Data.SqlClient.SqlException was thrown.Additional exception information: A network-related or instance-specific error oc

if exists(select * from sysdatabases where name='school')begindrop database schoolendgocreate database schoolon primary(name='school_data', --主数据文件的逻辑名称filename='F:\project\school_data.mdf'