MySql数据备份
MySql数据备份
1. cmd 环境下备份
在cmd环境下备份mysql数据库可用到如下命令:
1、备份某表
mysqldump -u username -p dbname table1 table2 ...> BackupName.sql
参数说明:
dbname:表示数据库的名称;
table1和table2:表示需要备份的表的名称,为空则整个数据库备份;
BackupName.sql:表示备份文件的名称,文件名前面可以加上一个绝对路径。
2、备份多个数据库
mysqldump -u username -p -databases dbname1 dbname2 > BackupName.sql
3、备份所有数据库
mysqldump -u username -p -all-databases > BackupName.sql
4、数据还原
mysql -u root -p [dbname] < backup.sql
2. 调用mysqldump.exe备份
有时候在java代码中需要定时作业备份,实现自动备份。这时候可采用如下方式进行数据备份。大致流程是:
1、创建bat文件
2、调用bat文件,获取输入流写入备份文件中
代码示例如下:
package com.hymake.xmq; import java.io.BufferedReader; import java.io.BufferedWriter; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.io.OutputStreamWriter; import java.util.Calendar; import java.util.Date; /** * MySql数据备份工具类 * @author xiongmq * */ public class MySqlBackup { public static void main(String[] args) { doBackup(); } //mySql数据备份 public static boolean doBackup(){ boolean flag=false; //设置备份信息 String databaseName="weixin";//数据库名字 String mysqldumpUrl="C:\\Program Files\\MySQL\\MySQL Server 5.5";//mysql安装位置 String savePath="d:\\数据备份"; //备份文件保存位置 String host="127.0.0.1";//主机ip String port="3306";//端口 String userName="root";//登录名 String password="123456";//登录密码 //初始化bat文件 String dataBackupBatPath = System.getProperty("java.io.tmpdir")+ "\\dataBackup.bat"; //创建bat文件,好做调用 getBackupBat(dataBackupBatPath); //拼凑备份命令 StringBuilder cmdStr=new StringBuilder(); cmdStr.append(dataBackupBatPath); Calendar cal = Calendar.getInstance(); Date now =new Date(); cal.setTime(now); String year=String.valueOf(cal.get(Calendar.YEAR)); String month=cal.get(Calendar.MONTH)+1<10?"0"+String.valueOf(cal.get(Calendar.MONTH)+1):String.valueOf(cal.get(Calendar.MONTH)+1); String date=cal.get(Calendar.DATE)<10?"0"+String.valueOf(cal.get(Calendar.DATE)):String.valueOf(cal.get(Calendar.DATE)); String hour=cal.get(Calendar.HOUR_OF_DAY)<10?"0"+String.valueOf(cal.get(Calendar.HOUR_OF_DAY)):String.valueOf(cal.get(Calendar.HOUR_OF_DAY)); String minute=cal.get(Calendar.MINUTE)<10?"0"+String.valueOf(cal.get(Calendar.MINUTE)):String.valueOf(cal.get(Calendar.MINUTE)); String sec=cal.get(Calendar.SECOND)<10?"0"+String.valueOf(cal.get(Calendar.SECOND)):String.valueOf(cal.get(Calendar.SECOND)); String sqlFielName=databaseName+"_"+year+month+date+hour+minute+sec; String sqlFielPath=year+"\\"+month; cmdStr.append(" \""+savePath+"\""); cmdStr.append(" \""+sqlFielPath+"\""); //获取数据库位置 cmdStr.append(" \""+mysqldumpUrl+"\""); cmdStr.append(" "+host); cmdStr.append(" "+port); cmdStr.append(" "+userName); cmdStr.append(" "+password); cmdStr.append(" "+databaseName); cmdStr.append(" "+sqlFielName); try { //执行命令 Process p = Runtime.getRuntime().exec(cmdStr.toString()); InputStream fis=p.getInputStream(); InputStreamReader isr=new InputStreamReader(fis); BufferedReader br=new BufferedReader(isr); while((br.readLine())!=null) { flag=true; } } catch (IOException e) { e.printStackTrace(); } return flag; } /** * 创建bat文件 * @param tempPath */ public static boolean getBackupBat(String tempPath){ boolean flag=false; StringBuilder content=new StringBuilder(); content.append("SET BACK_DIR=%1"); content.append("\r\n"); content.append("md %BACK_DIR%\\%2"); content.append("\r\n"); content.append("SET BACK_PATH=%BACK_DIR%\\%2"); content.append("\r\n"); content.append("SET MYSQL_PATH=%3"); content.append("\r\n"); content.append("%MYSQL_PATH%\\bin\\mysqldump.exe --opt -h%4 -P%5 -u%6 -p%7 %8> %BACK_PATH%\\%9.sql "); content.append("\r\n"); content.append("echo 数据备份完毕!"); String directoryPath = tempPath.substring(0, tempPath.lastIndexOf("\\")); String fileName = tempPath.substring(tempPath.lastIndexOf("\\") + 1, tempPath.length()); boolean checkDirectoryIsExist = new File(directoryPath).exists(); if(!checkDirectoryIsExist){ new File(directoryPath).mkdirs(); } try{ File file = new File(directoryPath + File.separator + fileName); BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(file), "UTF-8")); bw.write(content.toString()); flag = true; bw.close(); } catch (IOException e) { e.printStackTrace(); } return flag; } }