MySQL 使用java备份某张表的操作
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2022-04-03 10:47:04
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核心是mysqldump和Runtime
操作其实并不是很困难,创建一个进行备份操作的类,接收到备份调用后,标记该表正在备份,然后创建一个子线程进行备份操作。所需的配置信息是从配置文件读取的,也要注意在Windows和linux下路径问题。
配置文件如下:
# 数据库地址 dbAddress=localhost # 要备份的数据库名称 databaseName=nms # 数据库用户名 username = root # 数据库密码 password = root # mysqldump 路径 Linux mysqlpath = /usr/bin/ # 备份文件存放位置 Linux sqlFilePath =/MySQlBack/ # mysqldump 路径 Windows #mysqlpath = C\://Program Files//MySQL//MySQL Server 5.5//bin// # 备份文件存放位置 Windows #sqlFilePath =C\://MySQl//
执行功能的代码类如下:
package com.nms.common.db; import java.io.File; import java.io.IOException; import java.io.InputStream; import java.util.Map; import java.util.Properties; import java.util.concurrent.ConcurrentHashMap; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; /** * 用于数据库备份操作 */ public class DbBackUpMethod { private static Log logger = LogFactory.getLog(DbBackUpMethod.class); private static Properties pros = getPprVue("db.properties"); public static Map<String, String> backUpTableList = new ConcurrentHashMap<String, String>(); private static DbBackUpMethod backObj = new DbBackUpMethod(); public static DbBackUpMethod getDbBackUpMethod(){ return backObj; } public void backup(String tableName) { if(null != backUpTableList.get(tableName)) return ; backUpTableList.put(tableName, tableName); // 标记已经用于备份 new Thread(new DbBackUpThread(tableName)).start(); } /** * 用于执行某表的备份 */ class DbBackUpThread implements Runnable { String tableName = null; public DbBackUpThread(String tableName){ this.tableName = tableName; } @Override public void run() { try { String username = pros.getProperty("username"); String password = pros.getProperty("password"); String mysqlpaths = pros.getProperty("mysqlpath"); String address = pros.getProperty("dbAddress"); String databaseName = pros.getProperty("databaseName"); String sqlpath = pros.getProperty("sqlFilePath"); File backupath = new File(sqlpath); if (!backupath.exists()) { backupath.mkdir(); } StringBuffer sb = new StringBuffer(); sb.append(mysqlpaths); sb.append("mysqldump "); sb.append("--opt "); sb.append("-h "); sb.append(address); sb.append(" "); sb.append("--user="); sb.append(username); sb.append(" "); sb.append("--password="); sb.append(password); sb.append(" "); sb.append("--lock-all-tables=true "); sb.append("--result-file="); sb.append(sqlpath); sb.append(tableName+".sql"); sb.append(" "); sb.append("--default-character-set=utf8 "); sb.append(databaseName); sb.append(" "); sb.append(tableName); Runtime cmd = Runtime.getRuntime(); Process p = cmd.exec(sb.toString()); p.waitFor(); // 该语句用于标记,如果备份没有完成,则该线程持续等待 } catch (Exception e) { logger.error("备份操作出现问题", e); }finally{ backUpTableList.remove(tableName); // 最终都将解除 } } } public static Properties getPprVue(String properName) { InputStream inputStream = DbBackUpMethod.class.getClassLoader().getResourceAsStream(properName); Properties p = new Properties(); try { p.load(inputStream); inputStream.close(); } catch (IOException e) { logger.error("无法读取用于备份数据的配置文件", e); } return p; } }
在Action中,可以直接调用备份操作方法:
DbBackUpMethod.getDbBackUpMethod().backup(tableName); // 调用备份
同时,如果页面有删除该表的操作,在操作前应该判断该表是否在进行备份
if(null != DbBackUpMethod.backUpTableList.get(tableName))
然后页面JSP调用时,可以给予响应的提示,我的判断是只能删除一张表:
function deleteTableByTableName(){ var pk = table.getSelectedKeys(); if(""==pk){ alert("请选择一条记录!"); return false; } if(pk.length > 1){ alert("请选择一条记录!"); return false; } var rows = table.get(pk); var tableName=rows.tableName; if(confirm("你确认要删除该表吗?")) { if(confirm("删除该表前,你需要备份操作吗?\n\n选择备份后,系统将后台进行相关操作!\n在此期间,您不能删除该表!\n备份操作可能将持续数小时时间!请知晓!")) { document.form1.action="backUpTable.action?tableName=" + tableName; document.form1.submit(); }else{ if(confirm("你确认提交吗?该表将删除!")) { document.form1.action="del.action?tableName=" + tableName; document.form1.submit(); } } } }
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