MySQL数据库同步小工具（Java实现）

近期公司做个报表系统，为了报表系统中复杂的查询条件，不影响线上业务系统的使用，研究了一下MySQL数据库同步，下面用Java代码实现MySQL数据库同步，以便自己查阅！

数据库同步实现功能点：

1.支持跨服务器跨库的多线程同步

2.每张表的同步有日志记录

3.每次同步记录数可配置

一、数据同步核心代码

package com.zrscsoft.synchtool.db;


import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.HashMap;
import java.util.List;


import cn.com.dd.connector.db.ConnectionPoolManager;


import com.synch.connector.DataBaseUtil;
import com.synch.connector.DataSourceConnectDBVO;
import com.synch.connector.TableFieldVO;
import com.zrscsoft.synchtool.util.PropertyUtil;
import com.zrscsoft.synchtool.util.StringUtil;


public class SynchMain {
	public void addSynchLog(Connection bakconn, String synchtable,
			String synchsql, String syncherr, String synchtime) {
		PreparedStatement bakps = null;
		try {
			String bakInsertSQL = "insert into sys_synchlog (synchtable,synchsql,syncherr,synchtime,createtime) values ('"
					+ synchtable
					+ "','"
					+ synchsql
					+ "',?,'"
					+ synchtime + "',now())";
			bakps = bakconn.prepareStatement(bakInsertSQL);
			bakps.setString(1, syncherr);
			bakps.execute();
			bakconn.commit();
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			// 备库连接释放
			if (bakps != null) {
				try {
					bakps.close();
				} catch (SQLException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			}
		}
	}


	public void synch(String synchtablenames) throws Exception {
		HashMap<String, String> synProperty = PropertyUtil.getAllMessage();
		// 数据库连接参数
		DataSourceConnectDBVO maindb = new DataSourceConnectDBVO();
		maindb.setDataSourceType(0);
		maindb.setDataSourceName("maindb"+synchtablenames);
		maindb.setAccessMethod(0);
		maindb.setDataSourceAddress(synProperty.get("maindb.address"));
		maindb.setDataSourcePort(Integer.parseInt(synProperty
				.get("maindb.port")));
		maindb.setDatabaseName(synProperty.get("maindb.databasename"));
		maindb.setAccountName(synProperty.get("maindb.accountname"));
		maindb.setAccountPwd(synProperty.get("maindb.accountpwd"));


		DataSourceConnectDBVO bakdb = new DataSourceConnectDBVO();
		bakdb.setDataSourceType(0);
		bakdb.setDataSourceName("bakdb"+synchtablenames);
		bakdb.setAccessMethod(0);
		bakdb.setDataSourceAddress(synProperty.get("bakdb.address"));
		bakdb.setDataSourcePort(Integer.parseInt(synProperty.get("bakdb.port")));
		bakdb.setDatabaseName(synProperty.get("bakdb.databasename"));
		bakdb.setAccountName(synProperty.get("bakdb.accountname"));
		bakdb.setAccountPwd(synProperty.get("bakdb.accountpwd"));


		int currows = Integer.parseInt(synProperty.get("synchrows"));// 每次同步的记录数
		// 同步表名.
		String synchtablenamestmp=synProperty.get(synchtablenames);
		if(synchtablenamestmp==null||"".equals(synchtablenamestmp)){
			return;
		}
		
		String[] tableNames = synchtablenamestmp.split(",");
		for (int t = 0; t < tableNames.length; t++) {
			String tableName = tableNames[t];
			// 获取同步字段名
			List<TableFieldVO> list = DataBaseUtil.getFieldsForTable(tableName,
					maindb);
			String fields = "`"+list.get(0).getColumnName()+"`";
			String values = "?";
			String idfield="";
			int paraCount = list.size();
			for (int i = 1; i < paraCount; i++) {
				String columnName=list.get(i).getColumnName();
				fields = fields + ",`" + columnName+"`";
				values = values + ",?";
				if("id".equals(columnName.toLowerCase())){
					idfield=columnName;
				}
			}


			Connection mainconn = null;
			PreparedStatement mainps = null;
			ResultSet mainrs = null;
			Connection bakconn = null;
			PreparedStatement bakps = null;


			int curpage = 1;// 第几页,默认显示第1页
			long startTime = System.currentTimeMillis();
			String mainQuerySQL = "";
			String bakInsertSQL ="";
			while (true) {
				try {
					String orderby="".equals(idfield)?"":" order by "+idfield+" ";
					String limit = orderby+" limit " + (curpage - 1) * currows + ","
							+ currows;
					mainQuerySQL = "select * from " + tableName + limit;
					bakInsertSQL = "insert ignore into " + tableName + " ("
							+ fields + ") values (" + values + ")";
					// 主库
					mainconn = DataBaseUtil.getMySQLConnect(maindb);
					mainps = mainconn.prepareStatement(mainQuerySQL);
					mainrs = mainps.executeQuery();
					// 被库
					bakconn = DataBaseUtil.getMySQLConnect(bakdb);
					bakps = bakconn.prepareStatement(bakInsertSQL);
					int querySize = 0;
					while (mainrs.next()) {
						querySize++;
						for (int i = 0; i < paraCount; i++) {
							bakps.setString(i + 1, mainrs.getString(list.get(i)
									.getColumnName()));
						}
						bakps.addBatch();
					}
					if (querySize == 0) {
						break;
					}
					curpage++;
					bakps.executeBatch();
					bakconn.commit();
					this.addSynchLog(bakconn, tableName, mainQuerySQL, "",
							(System.currentTimeMillis() - startTime) + "");
				} catch (Exception e) {
					e.printStackTrace();
					this.addSynchLog(bakconn, tableName, mainQuerySQL,
							StringUtil.getExceptionAllinformation(e),
							(System.currentTimeMillis() - startTime) + "");
					break;
				} finally {
					// 主库连接释放
					if (mainrs != null) {
						try {
							mainrs.close();
						} catch (SQLException e) {
							// TODO Auto-generated catch block
							e.printStackTrace();
						}
					}
					if (mainps != null) {
						try {
							mainps.close();
						} catch (SQLException e) {
							// TODO Auto-generated catch block
							e.printStackTrace();
						}
					}
					if (mainconn != null) {
						ConnectionPoolManager.getInstance().release(mainconn);
					}
					// 备库连接释放
					if (bakps != null) {
						try {
							bakps.close();
						} catch (SQLException e) {
							// TODO Auto-generated catch block
							e.printStackTrace();
						}
					}
					if (bakconn != null) {
						ConnectionPoolManager.getInstance().release(bakconn);
					}
				}
			}
			System.out.println(tableNames.length + "/" + t + "表" + tableName
					+ "耗时：" + (System.currentTimeMillis() - startTime) + "毫秒");
		}
	}


	public static void main(String[] args) throws Exception {
		new SynchThread("synchtablenames1").start();
		new SynchThread("synchtablenames2").start();
		new SynchThread("synchtablenames3").start();
	}


}

二、数据库同步多线程实现

package com.zrscsoft.synchtool.db;

public class SynchThread extends Thread {
	private String synchtablenames;

	public SynchThread(String synchtablenames) {
		this.synchtablenames = synchtablenames;
	}

	public void run() {
		if(synchtablenames==null||"".equals(synchtablenames)){
			return;
		}
		SynchMain main = new SynchMain();
		try {
			main.synch(synchtablenames);
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

}

三、配置文件及读取配置文件代码

配置文件内容为：

#主库
maindb.address=localhost
maindb.port=3306
maindb.databasename=mysqlmain
maindb.accountname=root
maindb.accountpwd=root
#备库
bakdb.address=localhost
bakdb.port=3306
bakdb.databasename=mysqlbak
bakdb.accountname=root
bakdb.accountpwd=root
#同步表名，多张表以,分开
synchtablenames1=sys_user1
synchtablenames2=sys_user2
synchtablenames3=sys_user3
#每次同步记录数
synchrows=10000

读取配置文件的Java类为：

package com.zrscsoft.synchtool.util;

import java.util.Enumeration;
import java.util.HashMap;
import java.util.ResourceBundle;

public class PropertyUtil {
	public static HashMap<String, String> getAllMessage() {
		String propertyName = "synch";
		// 获得资源包
		ResourceBundle rb = ResourceBundle.getBundle(propertyName.trim());
		// 通过资源包拿到所有的key
		Enumeration<String> allKey = rb.getKeys();
		// 遍历key 得到 value
		HashMap<String, String> valList = new HashMap<String, String>();
		while (allKey.hasMoreElements()) {
			String key = allKey.nextElement();
			String value = (String) rb.getString(key);
			valList.put(key, value);
		}
		return valList;
	}
}

运行方式为：执行SynchMain.java类中的main()方法。

源码和具体的使用细则，可以到下载源码及使用说明 。