• cancal 資料庫同步工具也可用於同步建索

（一）下載

官網架包地址為：https://github.com/alibaba/canal/releases/tag/canal-1.1.5-alpha-2

本人百度雲盤下載地址：

連結：https://pan.baidu.com/s/1MM5YGubaTW3Y2hy1tvBmPw

提取碼：jiur

（二）上傳解壓

tar -zxvf canal.deployer-1.1.5-SNAPSHOT.tar.gz

查詢MySQL在Linux環境中的my.cnf

mysql --help|grep 'my.cnf'

2．修改my.cnf
vi /etc/my.cnf
    
log
 
-bin=mysql-bin #新增這一行就ok
 
binlog-format=ROW #選擇row模式
 
server_id=1 #配置mysql replaction需要定義，不能和canal的slaveId重複

重啟 MySQL

檢視MySQL啟動狀態
 
service mysqld status(5.0版本是mysqld)
service mysql status(5.5.7版本是mysql)
 
重啟MySQL
 
service mysqld restart
service mysql restart (5.5.7版本命令)

在Linux中登入MySQL

mysql -u 使用者名稱 -p
如：mysql 
 
-u root -p
輸入密碼對應的賬號密碼

檢視binlog檔案是否開啟

show variables like 'log_%';

package com.zxsoft.ntmss.canal;

import com.alibaba.otter.canal.client.CanalConnector;
import com.alibaba.otter.canal.client.CanalConnectors;
import com.alibaba.otter.canal.protocol.CanalEntry.*;
import com.alibaba.otter.canal.protocol.Message;
 
import com.google.protobuf.InvalidProtocolBufferException;

import java.net.InetSocketAddress;
import java.util.List;
import java.util.Queue;
import java.util.concurrent.ConcurrentLinkedQueue;

/**
 * @author idea
 * @date 2019/5/6
 * @Version V1.0
 */
public class Canal2ElsticsearchIndex {

    private static Queue<String> SQL_QUEUE = new ConcurrentLinkedQueue<>();

    public static void main(String args[]) {

        CanalConnector connector = CanalConnectors.newSingleConnector(new InetSocketAddress("192.168.1.101", 11111), "example", "", "");
        connector.connect();
        int batchSize = 1000;
        try {
            connector.connect();
            connector.rollback();
            try {
                while (true) {
                    //嘗試從master那邊拉去資料batchSize條記錄，有多少取多少
                    Message message = connector.getWithoutAck(batchSize);
                    long batchId = message.getId();
                    int size = message.getEntries().size();
                    if (batchId == -1 || size == 0) {
                        Thread.sleep(1000);
                    } else {
                        dataHandle(message.getEntries());
                    }
                    connector.ack(batchId);

                    //當佇列裡面堆積的sql大於一定數值的時候就模擬執行
                    if (SQL_QUEUE.size() >= 1) {
                        executeQueueSql();
                    }
                }
            } catch (InterruptedException e) {
                e.printStackTrace();
            } catch (InvalidProtocolBufferException e) {
                e.printStackTrace();
            }
        } finally {
            connector.disconnect();
        }
    }


    /**
     * 模擬執行佇列裡面的sql語句
     */
    public static void executeQueueSql() {
        int size = SQL_QUEUE.size();
        for (int i = 0; i < size; i++) {
            String sql = SQL_QUEUE.poll();
            System.out.println("[sql]----> " + sql);
        }
    }

    /**
     * 資料處理
     *
     * @param entrys
     */
    private static void dataHandle(List<Entry> entrys) throws InvalidProtocolBufferException {
        for (Entry entry : entrys) {
            if (EntryType.ROWDATA == entry.getEntryType()) {
                RowChange rowChange = RowChange.parseFrom(entry.getStoreValue());
                EventType eventType = rowChange.getEventType();
                if (eventType == EventType.DELETE) {
                    saveDeleteSql(entry);
                } else if (eventType == EventType.UPDATE) {
                    saveUpdateSql(entry);
                } else if (eventType == EventType.INSERT) {
                    saveInsertSql(entry);
                }
            }
        }
    }

    /**
     * 儲存更新語句
     *
     * @param entry
     */
    private static void saveUpdateSql(Entry entry) {
        try {
            RowChange rowChange = RowChange.parseFrom(entry.getStoreValue());
            List<RowData> rowDatasList = rowChange.getRowDatasList();
            for (RowData rowData : rowDatasList) {
                List<Column> newColumnList = rowData.getAfterColumnsList();
                StringBuffer sql = new StringBuffer("update " + entry.getHeader().getSchemaName() + "." + entry.getHeader().getTableName() + " set ");
                for (int i = 0; i < newColumnList.size(); i++) {
                    sql.append(" " + newColumnList.get(i).getName()
                            + " = '" + newColumnList.get(i).getValue() + "'");
                    if (i != newColumnList.size() - 1) {
                        sql.append(",");
                    }
                }
                sql.append(" where ");
                List<Column> oldColumnList = rowData.getBeforeColumnsList();
                for (Column column : oldColumnList) {
                    if (column.getIsKey()) {
                        //暫時只支援單一主鍵
                        sql.append(column.getName() + "=" + column.getValue());
                        break;
                    }
                }
                SQL_QUEUE.add(sql.toString());
            }
        } catch (InvalidProtocolBufferException e) {
            e.printStackTrace();
        }
    }

    /**
     * 儲存刪除語句
     *
     * @param entry
     */
    private static void saveDeleteSql(Entry entry) {
        try {
            RowChange rowChange = RowChange.parseFrom(entry.getStoreValue());
            List<RowData> rowDatasList = rowChange.getRowDatasList();
            for (RowData rowData : rowDatasList) {
                List<Column> columnList = rowData.getBeforeColumnsList();
                StringBuffer sql = new StringBuffer("delete from " + entry.getHeader().getSchemaName() + "." + entry.getHeader().getTableName() + " where ");
                for (Column column : columnList) {
                    if (column.getIsKey()) {
                        //暫時只支援單一主鍵
                        sql.append(column.getName() + "=" + column.getValue());
                        break;
                    }
                }
                SQL_QUEUE.add(sql.toString());
            }
        } catch (InvalidProtocolBufferException e) {
            e.printStackTrace();
        }
    }

    /**
     * 儲存插入語句
     *
     * @param entry
     */
    private static void saveInsertSql(Entry entry) {
        try {
            RowChange rowChange = RowChange.parseFrom(entry.getStoreValue());
            List<RowData> rowDatasList = rowChange.getRowDatasList();
            for (RowData rowData : rowDatasList) {
                List<Column> columnList = rowData.getAfterColumnsList();
                StringBuffer sql = new StringBuffer("insert into " + entry.getHeader().getSchemaName() + "." + entry.getHeader().getTableName() + " (");
                for (int i = 0; i < columnList.size(); i++) {
                    sql.append(columnList.get(i).getName());
                    if (i != columnList.size() - 1) {
                        sql.append(",");
                    }
                }
                sql.append(") VALUES (");
                for (int i = 0; i < columnList.size(); i++) {
                    sql.append("'" + columnList.get(i).getValue() + "'");
                    if (i != columnList.size() - 1) {
                        sql.append(",");
                    }
                }
                sql.append(")");
                SQL_QUEUE.add(sql.toString());
            }
        } catch (InvalidProtocolBufferException e) {
            e.printStackTrace();
        }
    }

}