环境
MySQL：192.168.2.102
Canal： 192.168.2.101
IDea： 本机
1、创建 MySQL 启动脚本
# 创建数据，配置目录
mkdir -p /docker/mysql/{data,conf.d}
# 创建配置文件
vim /docker/mysql3306/conf.d/my.cnf
[mysqld]
log_timestamps=SYSTEM
default-time-zone='+8:00'
log-bin=mysql-bin
server-id=3306
binlog_format=row
启动脚本
vim /docker/mysql3306/start.sh
docker run --name mysql3306 \
-p 3306:3306 \
-v /docker/mysql3306/conf.d:/etc/mysql/conf.d \
-v /docker/mysql3306/data:/var/lib/mysql \
-e MYSQL_ROOT_PASSWORD=123456 \
-d mysql:5.7
2、创建数据库，表及相关数据
创建用于 同步的账号
create user canal@'%' IDENTIFIED by 'canal';
grant SELECT, REPLICATION SLAVE, REPLICATION CLIENT on *.* to 'canal'@'%' identified by "canal";
flush privileges;
3、创建 canal 启动脚本
vim /docker/canal/start.sh
# 内容
docker run --name canal \
-e canal.instance.master.address=192.168.2.102:3306 \
-e canal.instance.dbUsername=canal \
-e canal.instance.dbPassword=canal \
-p 11111:11111 \
-d canal/canal-server:v1.1.4
4、进入 canal 容器
docker exec -it canal /bin/bash
docker exec -it canal /bin/bash
# 成功
2020-11-04 23:55:49.892 [main] INFO c.a.o.c.i.spring.support.PropertyPlaceholderConfigurer - Loading properties file from class path resource [canal.properties]
2020-11-04 23:55:49.893 [main] INFO c.a.o.c.i.spring.support.PropertyPlaceholderConfigurer - Loading properties file from class path resource [example/instance.properties]
2020-11-04 23:55:50.324 [main] INFO c.a.otter.canal.instance.spring.CanalInstanceWithSpring - start CannalInstance for 1-example
2020-11-04 23:55:50.332 [main] WARN c.a.o.canal.parse.inbound.mysql.dbsync.LogEventConvert - --> init table filter : ^.*\..*$
2020-11-04 23:55:50.333 [main] WARN c.a.o.canal.parse.inbound.mysql.dbsync.LogEventConvert - --> init table black filter :
2020-11-04 23:55:50.340 [main] INFO c.a.otter.canal.instance.core.AbstractCanalInstance - start successful....
2020-11-04 23:55:51.269 [destination = example , address = /192.168.2.102:3306 , EventParser] WARN c.a.o.c.p.inbound.mysql.rds.RdsBinlogEventParserProxy - --->
find start position successfully, EntryPosition[included=false,journalName=mysql-bin.000003,position=1355,serverId=3306,gtid=,timestamp=1604192078000] cost : 840ms , the next step is binlog dump
\
5、启动 Idea
https://github.com/alibaba/canal/wiki/ClientExample
POM 文件
<dependency>
<groupId>com.alibaba.otter</groupId>
<artifactId>canal.client</artifactId>
<version>1.0.12</version>
</dependency>
<dependency>
<groupId>com.alibaba.otter</groupId>
<artifactId>canal.protocol</artifactId>
<version>1.0.12</version>
</dependency>
import java.net.InetSocketAddress;
import java.util.List;
import com.alibaba.otter.canal.client.CanalConnectors;
import com.alibaba.otter.canal.client.CanalConnector;
import com.alibaba.otter.canal.protocol.Message;
import com.alibaba.otter.canal.protocol.CanalEntry.Column;
import com.alibaba.otter.canal.protocol.CanalEntry.Entry;
import com.alibaba.otter.canal.protocol.CanalEntry.EntryType;
import com.alibaba.otter.canal.protocol.CanalEntry.EventType;
import com.alibaba.otter.canal.protocol.CanalEntry.RowChange;
import com.alibaba.otter.canal.protocol.CanalEntry.RowData;
public class SimpleCanalClientExample {
public static void main(String args[]) {
// 创建链接
CanalConnector connector = CanalConnectors.newSingleConnector(new InetSocketAddress("192.168.2.101",
11111), "example", "canal", "canal");
int batchSize = 1000;
int emptyCount = 0;
try {
connector.connect();
connector.subscribe(".*\\..*");
connector.rollback();
int totalEmptyCount = 120;
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<Entry> entrys) {
for (Entry entry : entrys) {
if (entry.getEntryType() == EntryType.TRANSACTIONBEGIN || entry.getEntryType() == EntryType.TRANSACTIONEND) {
continue;
}
RowChange rowChage = null;
try {
rowChage = RowChange.parseFrom(entry.getStoreValue());
} catch (Exception e) {
throw new RuntimeException("ERROR ## parser of eromanga-event has an error , data:" + entry.toString(),
e);
}
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 (RowData rowData : rowChage.getRowDatasList()) {
if (eventType == EventType.DELETE) {
printColumn(rowData.getBeforeColumnsList());
} else if (eventType == 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<Column> columns) {
for (Column column : columns) {
System.out.println(column.getName() + " : " + column.getValue() + " update=" + column.getUpdated());
}
}
}
6、启动项目，MySQL 插入一条数据
7、此时 idea 控制台 会输出 对应的 SQL
empty count : 26
empty count : 27
empty count : 28
empty count : 29
================> binlog[mysql-bin.000003:5164] , name[school,student] , eventType : INSERT
id : 6 update=true
name : jack update=true
age : 16 update=true
empty count : 1
empty count : 2
empty count : 3
