MySQL 使用java备份某张表的操作

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 Linuxmysqlpath = /usr/bin/# 备份文件存放位置 LinuxsqlFilePath =/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;}@Overridepublic 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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