使用Canal同步Mysql数据到Redis

缺乏、安全感 2023-06-13 03:22 26阅读 0赞

1.Canal是通过数据库日志来进行同步的，所以要确保mysql开启了binlog日志,配置后重启mysql。

[mysqld]
    log-bin=mysql-bin #添加这一行就ok
    binlog-format=ROW #选择row模式
    server_id=1 #配置mysql replaction需要定义，不能和canal的slaveId重复

2.在mysql中 配置canal数据库管理用户，配置相应权限

CREATE USER canal IDENTIFIED BY 'canal';    
        GRANT SELECT, REPLICATION SLAVE, REPLICATION CLIENT ON *.* TO 'canal'@'%';  
        -- GRANT ALL PRIVILEGES ON *.* TO 'canal'@'%' ;  
        FLUSH PRIVILEGES;

3.查看当前使用的日志文件,

SHOW MASTER STATUS;

![20191113153651251.png][]

记录下mysql-bin.000002和postion位置。

4.下载Canal插件[https://github.com/alibaba/canal/releases/tag/canal-1.0.24][https_github.com_alibaba_canal_releases_tag_canal-1.0.24]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xldHRlcnNz_size_16_color_FFFFFF_t_70][]

解压后配置conf/example/instance.properties文件

#################################################
    ## mysql serverId,随便写一个不要与mysql里面配置的serverid相同就行
    canal.instance.mysql.slaveId = 1234
    
    # 数据库端口地址
    canal.instance.master.address = 127.0.0.1:3306
    #当前使用的日志文件
    canal.instance.master.journal.name = mysql-bin.000002 
    #位置position
    canal.instance.master.position = 449503
    canal.instance.master.timestamp = 
    
    #canal.instance.standby.address = 
    #canal.instance.standby.journal.name =
    #canal.instance.standby.position = 
    #canal.instance.standby.timestamp = 
    
    # username/password（创建数据库用户账号密码）
    canal.instance.dbUsername = canal
    canal.instance.dbPassword = canal
    #数据库名
    canal.instance.defaultDatabaseName =itv_basic_v022
    canal.instance.connectionCharset = UTF-8
    
    # table regex
    canal.instance.filter.regex = .*\\..*
    # table black regex
    canal.instance.filter.black.regex =  
    
    #################################################

在bin目录下面点击startup启动

5.然后配置Canal客户端，修改POM文件（pom.xml），添加依赖：

<dependency>
        <groupId>com.alibaba.otter</groupId>
        <artifactId>canal.client</artifactId>
        <version>1.0.12</version>
    </dependency>
     <dependency>
       <groupId>redis.clients</groupId>
        <artifactId>jedis</artifactId>
        <version>2.9.0</version>
      </dependency>

6.创建redis工具类

import redis.clients.jedis.Jedis;
    import redis.clients.jedis.JedisPool;
    import redis.clients.jedis.JedisPoolConfig;
    
    import java.util.Iterator;
    import java.util.List;
    import java.util.Map;
    import java.util.Set;
    
    /**
     * @Author: wangsheng
     * @Description:
     * @CreateDate: 2019/11/13 10:06
     */
    public class RedisUtil {
        private static String ip = "localhost";
        private static int port = 6379;
        private static int timeout = 10000;
        private static JedisPool pool = null;
    
    
        static {
            JedisPoolConfig config = new JedisPoolConfig();
            config.setMaxTotal(1024);//最大连接数
            config.setMaxIdle(200);//最大空闲实例数
            config.setMaxWaitMillis(10000);//等连接池给连接的最大时间，毫秒
            config.setTestOnBorrow(true);//borrow一个实例的时候，是否提前vaildate操作
    
            pool = new JedisPool(config, ip, port, timeout);
    
        }
    
        //得到redis连接
        public static Jedis getJedis() {
            if (pool != null) {
                return pool.getResource();
            } else {
                return null;
            }
        }
    
        //关闭redis连接
        public static void close(final Jedis redis) {
            if (redis != null) {
                redis.close();
            }
        }
      
        public static boolean existKey(String key) {
            return getJedis().exists(key);
        }
    
        public static void delKey(String key) {
            getJedis().del(key);
        }
    
        public static String stringGet(String key) {
            return getJedis().get(key);
        }
    
        public static String stringSet(String key, String value) {
            return getJedis().set(key, value);
        }
    
        public static void hashSet(String key, String field, String value) {
            getJedis().hset(key, field, value);
        }
    
    }

7.创建CanalClient测试类

import java.net.InetSocketAddress;
    import java.util.List;
    import com.alibaba.fastjson.JSONObject;
    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;
    import com.alibaba.otter.canal.client.*;
    
    /**
     * @Author: wangsheng
     * @Description:
     * @CreateDate: 2019/11/13 13:01
     */
    public class CanalClient {
        public static void main(String args[]) {
            // 创建链接,127.0.0.1是ip，11111是canal的端口号，默认是11111，这个在conf/canal.properties文件里配置，example是canal虚拟的模块名，
            // 在canal.properties文件canal.destinations= example 这段可以自行修改。canal是创建的数据库账号密码
            CanalConnector connector = CanalConnectors.newSingleConnector(new InetSocketAddress("127.0.0.1",
                    11111), "example", "canal", "canal");
            int batchSize = 1000;
            int emptyCount = 0;
            try {
                connector.connect();
                connector.subscribe(".*\\..*");
                connector.rollback();
                int totalEmtryCount = 1200;
                while (emptyCount < totalEmtryCount) {
                    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) {
                            e.printStackTrace();
                        }
                    } 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());
                        redisDelete(rowData.getBeforeColumnsList(), entry.getHeader().getTableName());
                    } else if (eventType == EventType.INSERT) {
                        printColumn(rowData.getAfterColumnsList());
                        redisInsert(rowData.getAfterColumnsList(), entry.getHeader().getTableName());
                    } else {
                        System.out.println("-------> before");
                        printColumn(rowData.getBeforeColumnsList());
                        System.out.println("-------> after");
                        printColumn(rowData.getAfterColumnsList());
                        redisUpdate(rowData.getAfterColumnsList(), entry.getHeader().getTableName());
                    }
                }
            }
        }
    
        private static void printColumn(List<Column> columns) {
            for (Column column : columns) {
                System.out.println(column.getName() + " : " + column.getValue() + "    update=" + column.getUpdated());
            }
        }
    
        private static void redisInsert(List<Column> columns, String tablename) {
            JSONObject json = new JSONObject();
            for (Column column : columns) {
                json.put(column.getName(), column.getValue());
            }
            if (columns.size() > 0) {
                RedisUtil.stringSet(tablename + columns.get(0).getValue(), json.toJSONString());//以表名+第一列主键为key
            }
        }
    
        private static void redisUpdate(List<Column> columns, String tablename) {
            JSONObject json = new JSONObject();
            for (Column column : columns) {
                json.put(column.getName(), column.getValue());
            }
            if (columns.size() > 0) {
                RedisUtil.stringSet(tablename + columns.get(0).getValue(), json.toJSONString());//以表名+第一列主键为key
            }
        }
    
        private static void redisDelete(List<Column> columns, String tablename) {
            JSONObject json = new JSONObject();
            for (Column column : columns) {
                json.put(column.getName(), column.getValue());
            }
            if (columns.size() > 0) {
                RedisUtil.delKey(tablename + columns.get(0).getValue());//以表名+第一列主键为key
            }
        }
    
    
    }

运行效果

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xldHRlcnNz_size_16_color_FFFFFF_t_70 1][]

导入一张表，redis中显示（表名+id为key）

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xldHRlcnNz_size_16_color_FFFFFF_t_70 2][]

[20191113153651251.png]: https://img-blog.csdnimg.cn/20191113153651251.png
[https_github.com_alibaba_canal_releases_tag_canal-1.0.24]: https://github.com/alibaba/canal/releases/tag/canal-1.0.24
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xldHRlcnNz_size_16_color_FFFFFF_t_70]: https://img-blog.csdnimg.cn/20191113154422515.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xldHRlcnNz,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xldHRlcnNz_size_16_color_FFFFFF_t_70 1]: https://img-blog.csdnimg.cn/20191113160253592.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xldHRlcnNz,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xldHRlcnNz_size_16_color_FFFFFF_t_70 2]: https://img-blog.csdnimg.cn/20191113161309283.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xldHRlcnNz,size_16,color_FFFFFF,t_70