一、SqlServer T-Sql实现数据库完整备份和还原
本中方式整理总结为3.0的版本
本次整理说明:
1.不再使用存储过程模式,直接使用t-sql语句处理
2.解决数据库还原“因为数据库正在使用,所以无法获得对数据库的独占访问权”的问题,更多参考:Sql server还原失败(数据库正在使用,无法获得对数据库的独占访问权)
二、Sql整理
1.备份语句
use master; go ---声明变量 declare @dbName nvarchar(max)='Mvc_HNHZ'; declare @dbFullName nvarchar(max)='E:\NewWork\Web\backup\test1.bak'; ---备份数据库 DECLARE @kid varchar(100) SET @kid='' SELECT @kid=@kid+'KILL '+CAST(spid as Varchar(10)) FROM master..sysprocesses WHERE dbid=DB_ID(@dbName) PRINT @kid EXEC(@kid); backup database Mvc_HNHZ to disk=@dbFullName;
2.还原语句
use master go ---声明变量 declare @dbName nvarchar(max)='Mvc_HNHZ'; declare @dbFullName nvarchar(max)='E:\NewWork\Web\backup\test1.bak'; --1.1修改为单用模式 exec(N'ALTER DATABASE '+@dbName+' SET SINGLE_USER WITH ROLLBACK IMMEDIATE'); --1.2结束链接进程 DECLARE @kid varchar(max) SET @kid='' SELECT @kid=@kid+'KILL '+CAST(spid as Varchar(10)) FROM master..sysprocesses WHERE dbid=DB_ID(@dbName) ; EXEC(@kid) ; --2.执行还原语句 restore database @dbName from disk=@dbFullName with replace --覆盖现有的数据库 --3.重置数据库为多用户模式 exec(N'ALTER DATABASE '+@dbName+' SET MULTI_USER WITH ROLLBACK IMMEDIATE');
三、Ado.Net 关键代码
1.备份操作
/// <summary> /// 创建数据库备份 /// </summary> public static void CreateBackup() { string dbname = GetDbName(); //要备份的位置 string dbfullname = GetDbPath() + string.Format("{0}_{1}.bak", dbname, DateTime.Now.ToString("yyyyMMddhhmmss")); //判断文件是否存在 if (File.Exists(dbfullname)) { throw new Exception(dbfullname + "的备份文件已经存在,请稍后再试"); } try { SqlConnection con = DbHelperSQL.GetConnection(); SqlCommand cmd = con.CreateCommand(); con.Open(); try { cmd.CommandText = "use master"; cmd.ExecuteNonQuery(); //1. 执行备份操作 StringBuilder sql = new StringBuilder(); //sql.Append("exec master.dbo.proc_Backup @dbName,@dbFullName"); sql.Append(@"DECLARE @kid varchar(100) SET @kid='' SELECT @kid=@kid+'KILL '+CAST(spid as Varchar(10)) FROM master..sysprocesses WHERE dbid=DB_ID(@dbName) PRINT @kid EXEC(@kid); backup database Mvc_HNHZ to disk=@dbFullName;"); SqlParameter[] parameters = new SqlParameter[]{ new SqlParameter("@dbName",SqlDbType.NVarChar,200), new SqlParameter("@dbFullName",SqlDbType.NVarChar,200), }; parameters[0].Value = dbname; parameters[1].Value = dbfullname; cmd.Parameters.Clear(); cmd.Parameters.AddRange(parameters); cmd.CommandText = sql.ToString(); cmd.ExecuteNonQuery(); } finally { con.Close(); } } catch (Exception ex) { throw new Exception("创建数据库备份出错:" + ex); } }
2.还原操作
/// <summary> /// 还原数据库 /// </summary> public static void Restore(string restoreFileName) { //1.获取还原数据库和文件 string dbName = GetDbName(); string dbFullName = GetDbPath() + restoreFileName; try { //2.执行还原操作 SqlConnection con = DbHelperSQL.GetConnection(); SqlCommand cmd = con.CreateCommand(); con.Open(); try { cmd.CommandText = "use master"; cmd.ExecuteNonQuery(); StringBuilder sql = new StringBuilder(); //sql.Append("exec proc_Restore @dbFullName,@dbName"); sql.Append(@"--1.1修改为单用模式 exec(N'ALTER DATABASE '+@dbName+' SET SINGLE_USER WITH ROLLBACK IMMEDIATE'); --1.2结束链接进程 DECLARE @kid varchar(max) SET @kid='' SELECT @kid=@kid+'KILL '+CAST(spid as Varchar(10)) FROM master..sysprocesses WHERE dbid=DB_ID(@dbName) ; EXEC(@kid) ; --2.执行还原语句 restore database @dbName from disk=@dbFullName with replace --覆盖现有的数据库 --3.重置数据库为多用户模式 exec(N'ALTER DATABASE '+@dbName+' SET MULTI_USER WITH ROLLBACK IMMEDIATE');"); SqlParameter[] parameters = new SqlParameter[]{ new SqlParameter("@dbName",SqlDbType.NVarChar,200), new SqlParameter("@dbFullName",SqlDbType.NVarChar,200), }; parameters[0].Value = dbName; parameters[1].Value = dbFullName; cmd.CommandText = sql.ToString(); cmd.Parameters.AddRange(parameters); cmd.ExecuteNonQuery(); } finally { con.Close(); } } catch (Exception ex) { throw new Exception("还原数据库出错" + ex); } }
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