前言：基于 MySQL 数据库增量日志解析，提供增量数据订阅和消费，可以有效监控数据库的字段值的修改
访问下载网址，直接进行下载，或者使用命令进行下载
wget https://github.com/alibaba/canal/releases/download/canal-1.0.17/canal.deployer-1.0.17.tar.gz现在完成后进行解压，修改 conf/example/instance.properties 配置文件
## mysql serverId canal.instance.mysql.slaveId = 1234 #position info，需要改成自己的数据库信息 canal.instance.master.address = 127.0.0.1:3306 canal.instance.master.journal.name = canal.instance.master.position = canal.instance.master.timestamp = #canal.instance.standby.address = #canal.instance.standby.journal.name = #canal.instance.standby.position = #canal.instance.standby.timestamp = # 修改dbUsername、dbPassword为自己的数据库用户连接名 canal.instance.dbUsername = root canal.instance.dbPassword = 1234 # 需要监控那个库 canal.instance.defaultDatabaseName = canal.instance.connectionCharset = UTF-8 #table regex canal.instance.filter.regex = .\*\\\\..\*点击 /bin/startup.bat 脚本进行启动
修改 my.ini 配置文件
# 在文件末尾添加 log-bin=mysql-bin # 开启 binlog binlog-format=ROW # 选择 ROW 模式 server_id=1 # 配置 MySQL replaction 需要定义，不要和 canal 的 slaveId 重复授权 canal 链接 MySQL 账号具有作为 MySQL slave 的权限
# 连接MySql数据库 mysql -uroot -p # 输入自己的密码 # 依次输入以下命令 CREATE USER canal IDENTIFIED BY 'canal'; GRANT SELECT, REPLICATION SLAVE, REPLICATION CLIENT ON *.* TO 'canal'@'%'; -- GRANT ALL PRIVILEGES ON *.* TO 'canal'@'%' ; FLUSH PRIVILEGES;重启MySql服务
# 关闭 net stop mysql # 开启 net start mysql导入Maven
<dependency> <groupId>com.alibaba.otter</groupId> <artifactId>canal.client</artifactId> <version>1.1.0</version> </dependency>ClientSample 代码
连接客户端，如果数据库有CRD操作会打印日志
import com.alibaba.otter.canal.client.CanalConnector; import com.alibaba.otter.canal.client.CanalConnectors; import com.alibaba.otter.canal.common.utils.AddressUtils; import com.alibaba.otter.canal.protocol.CanalEntry; import com.alibaba.otter.canal.protocol.Message; import java.net.InetSocketAddress; import java.util.List; /** * @author: mingan.xie * @since: 2020/9/3 * @history: 1.2020/9/3 created by xma */ public class SimpleCanalClientExample { public static void main(String args[]) { // 创建链接 CanalConnector connector = CanalConnectors.newSingleConnector(new InetSocketAddress(AddressUtils.getHostIp(), 11111), "example", "", ""); int batchSize = 1000; int emptyCount = 0; try { connector.connect(); connector.subscribe(".*\\..*"); connector.rollback(); int totalEmptyCount = 300; while (emptyCount < totalEmptyCount) { Message message = connector.getWithoutAck(batchSize); // 获取指定数量的数据 long batchId = message.getId(); int size = message.getEntries().size(); if (batchId == -1 || size == 0) { emptyCount++; System.out.println("empty count : " + emptyCount); try { Thread.sleep(1000); } catch (InterruptedException e) { } } else { emptyCount = 0; // System.out.printf("message[batchId=%s,size=%s] \n", batchId, size); printEntry(message.getEntries()); } connector.ack(batchId); // 提交确认 // connector.rollback(batchId); // 处理失败, 回滚数据 } System.out.println("empty too many times, exit"); } finally { connector.disconnect(); } } private static void printEntry(List<CanalEntry.Entry> entrys) { for (CanalEntry.Entry entry : entrys) { if (entry.getEntryType() == CanalEntry.EntryType.TRANSACTIONBEGIN || entry.getEntryType() == CanalEntry.EntryType.TRANSACTIONEND) { continue; } CanalEntry.RowChange rowChage = null; try { rowChage = CanalEntry.RowChange.parseFrom(entry.getStoreValue()); } catch (Exception e) { throw new RuntimeException("ERROR ## parser of eromanga-event has an error , data:" + entry.toString(), e); } CanalEntry.EventType eventType = rowChage.getEventType(); System.out.println(String.format("================> binlog[%s:%s] , name[%s,%s] , eventType : %s", entry.getHeader().getLogfileName(), entry.getHeader().getLogfileOffset(), entry.getHeader().getSchemaName(), entry.getHeader().getTableName(), eventType)); for (CanalEntry.RowData rowData : rowChage.getRowDatasList()) { if (eventType == CanalEntry.EventType.DELETE) { printColumn(rowData.getBeforeColumnsList()); } else if (eventType == CanalEntry.EventType.INSERT) { printColumn(rowData.getAfterColumnsList()); } else { System.out.println("-------> before"); printColumn(rowData.getBeforeColumnsList()); System.out.println("-------> after"); printColumn(rowData.getAfterColumnsList()); } } } } private static void printColumn(List<CanalEntry.Column> columns) { for (CanalEntry.Column column : columns) { System.out.println(column.getName() + " : " + column.getValue() + " update=" + column.getUpdated()); } } }