1.连接数据库的代码:
package com.once.xfd.dbutil;import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;public class DataBaseUtil {/*** 获取数据库连接* @return Connection 对象*/public static Connection getConnection() {Connection conn = null;try {Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");String url = "jdbc:sqlserver://127.0.0.1:1433;databaseName=master";String username = "sa";String password = "123456"; conn = DriverManager.getConnection(url, username, password);} catch (ClassNotFoundException e) {e.printStackTrace();} catch (SQLException e) {e.printStackTrace();}return conn;}public static void closeConn(Connection conn) {if (conn != null) {try {conn.close();} catch (SQLException e) {e.printStackTrace();}}}
}
2.备份功能代码:
/*** 备份数据库* @return backup* @throws Exception*/
public String backup() {ActionContext context = ActionContext.getContext();HttpServletRequest request = (HttpServletRequest) context.get(ServletActionContext.HTTP_REQUEST);String webtruepath = request.getParameter("path");String name = "dbname"; //数据库名try {File file = new File(webtruepath);String path = file.getPath() + "\\" + name + ".bak";// name文件名String bakSQL = "backup database 数据库名 to disk=? with init";// SQL语句PreparedStatement bak = DataBaseUtil.getConnection().prepareStatement(bakSQL);bak.setString(1, path);// path必须是绝对路径bak.execute(); // 备份数据库bak.close();} catch (Exception e) {e.printStackTrace();}return "backup";}
3.还原数据库代码(调用存储过程)
/*** 数据库还原* @return recovery*/public String recovery() {ActionContext context = ActionContext.getContext();HttpServletRequest request = (HttpServletRequest) context.get(ServletActionContext.HTTP_REQUEST);String webtruepath = request.getParameter("path");String name = "******";String dbname = "******";try {File file = new File(webtruepath);String path = file.getPath() + "\\" + name + ".bak";// name文件名String recoverySql = "ALTER DATABASE 数据库名 SET ONLINE WITH ROLLBACK IMMEDIATE";// 恢复所有连接PreparedStatement ps = DataBaseUtil.getConnection().prepareStatement(recoverySql);CallableStatement cs = DataBaseUtil.getConnection().prepareCall("{call killrestore(?,?)}");cs.setString(1, dbname); // 数据库名cs.setString(2, path); // 已备份数据库所在路径cs.execute(); // 还原数据库ps.execute(); // 恢复数据库连接 //执行查询数据库操作PreparedStatement pStatement=DataBaseUtil.getConnection().prepareStatement("select * from [t_sjbf]");System.out.println(pStatement.execute()); //将连接异常在后台进行处理,处理完这一次异常之后,就可以建立正常的数据库连接dao.find("select * from [t_sjbf]"); } catch (Exception e) {e.printStackTrace();}return "recovery";}
代码中标为紫色部分的代码并不会影响数据的还原,只是在JFinal中数据还原后连接不会在第一时间内连接上,这样前台在刷新页面的时候便会出现警告,为了防止前端出现这样的警告,把数据库的连接操作在后台进行处理(通过dao.find("select * from [t_sjbf]");这条语句就可以建立起与数据库的连接)。
4.存储过程代码:
create proc killrestore (@dbname varchar(20),@dbpath varchar(40))
as
begin
declare @sql nvarchar(500)
declare @spid int
set @sql='declare getspid cursor for select spid from sysprocesses where dbid=db_id('''+@dbname+''')'
exec (@sql)
open getspid
fetch next from getspid into @spid
while @@fetch_status <> -1
begin
exec('kill '+@spid)
fetch next from getspid into @spid
end
close getspid
deallocate getspid
restore database @dbname from disk= @dbpath with replace
end
注意:存储过程创建在系统数据库master下面,切记,否则会报错!!!
在执行数据还原之前应该在master数据库中建立此存储过程,否则会报错。
建立存储过程的步骤如下:
打开SqlServer-->数据库-->系统数据库-->master-->可编程性-->存储过程-->右击存储过程-->在新打开的页面中复制上面的存储过程的代码-->全选这段代码-->执行这段代码-->刷新master数据库,就会出现新建的存储过程了
如下图所示: