~chenjiahe/canal-spring-boot-starter.git

duxinglangzi

2022-06-24 4c9cf718ceb525f76da1fa4700a6e39bf964ebd8

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de8c2b	1	# Canal Spring Boot Starter 使用实例
D	2
	3	### 在spring boot 项目配置文件 application.yml内增加以下内容
	4	```yaml
	5	spring:
	6	canal:
	7	instances:
	8	example: # 拉取 example 目标的数据
	9	host: 192.168.10.179 # canal 所在机器的ip
	10	port: 11111 # canal 默认暴露端口
	11	user-name: canal # canal 用户名
	12	password: canal # canal 密码
	13	batch-size: 600 # canal 每次拉取的数据条数
	14	retry-count: 5 # 重试次数,如果重试5次后,仍无法连接,则断开
	15	cluster-enabled: false # 是否开启集群
	16	zookeeper-address: # zookeeper 地址(开启集群的情况下生效), 例: 192.168.0.1:2181,192.168.0.2:2181,192.168.0.3:2181
	17	acquire-interval: 1000 # 未拉取到消息情况下,获取消息的时间间隔毫秒值
	18	subscribe: .\\.. # 默认情况下拉取所有库、所有表
4c9cf7	19	prod:
D	20	example: example1
	21	database: books
de8c2b	22
D	23	```
	24
	25	### 在spring boot 项目中的代码使用实例
	26	```java
	27
	28
	29	import com.alibaba.otter.canal.protocol.CanalEntry;
	30	import com.duxinglangzi.canal.starter.annotation.CanalListener;
	31	import com.duxinglangzi.canal.starter.annotation.CanalUpdateListener;
	32	import org.springframework.stereotype.Service;
	33
	34	import java.util.stream.Collectors;
	35
	36	/**
	37	* @author wuqiong 2022/4/12
	38	* @description
	39	*/
	40	@Service
	41	public class CanalListenerTest {
	42
	43	/**
627420	44	* 目前 Listener 方法的参数必须为 CanalEntry.EventType , CanalEntry.RowData
de8c2b	45	* 程序在启动过程中会做检查
D	46	*/
a87aa7	47
D	48	/**
	49	* 监控更新操作
	50	* 支持动态参数配置，配置项需在 yml 或 properties 进行配置
	51	* 目标是 ${prod.example} 的 ${prod.database} 库 users表
	52	*/
	53	@CanalUpdateListener(destination = "${prod.example}", database = "${prod.database}", table = {"users"})
	54	public void listenerExampleBooksUsers(CanalEntry.EventType eventType, CanalEntry.RowData rowData) {
	55	printChange("listenerExampleBooksUsers",eventType, rowData);
	56	}
de8c2b	57
D	58	/**
	59	* 监控更新操作，目标是 example的 books库 users表
	60	*/
	61	@CanalUpdateListener(destination = "example", database = "books", table = {"users"})
	62	public void listenerExampleBooksUsers(CanalEntry.EventType eventType, CanalEntry.RowData rowData) {
	63	printChange("listenerExampleBooksUsers",eventType, rowData);
	64	}
	65
	66	/**
	67	* 监控更新操作，目标是 example的 books库 books表
	68	*/
	69	@CanalUpdateListener(destination = "example", database = "books", table = {"books"})
	70	public void listenerExampleBooksBooks(CanalEntry.EventType eventType, CanalEntry.RowData rowData) {
	71	printChange("listenerExampleBooksBooks",eventType, rowData);
	72	}
	73
	74	/**
	75	* 监控更新操作，目标是 example的 books库的所有表
	76	*/
	77	@CanalListener(destination = "example", database = "books", eventType = CanalEntry.EventType.UPDATE)
	78	public void listenerExampleBooksAll(CanalEntry.EventType eventType, CanalEntry.RowData rowData) {
	79	printChange("listenerExampleBooksAll",eventType, rowData);
	80	}
	81
	82	/**
	83	* 监控更新操作，目标是 example的所有库的所有表
	84	*/
	85	@CanalListener(destination = "example", eventType = CanalEntry.EventType.UPDATE)
	86	public void listenerExampleAll(CanalEntry.EventType eventType, CanalEntry.RowData rowData) {
	87	printChange("listenerExampleAll",eventType, rowData);
	88	}
	89
	90	/**
	91	* 监控更新、删除、新增操作，所有配置的目标下的所有库的所有表
	92	*/
	93	@CanalListener(eventType = {CanalEntry.EventType.UPDATE, CanalEntry.EventType.INSERT, CanalEntry.EventType.DELETE})
	94	public void listenerAllDml(CanalEntry.EventType eventType, CanalEntry.RowData rowData) {
	95	printChange("listenerAllDml",eventType, rowData);
	96	}
	97
	98	public void printChange(String method,CanalEntry.EventType eventType, CanalEntry.RowData rowData) {
	99	if (eventType == CanalEntry.EventType.DELETE) {
af6d64	100	rowData.getBeforeColumnsList().stream().collect(Collectors.toList()).forEach(ele -> {
de8c2b	101	System.out.println("[方法: "+method+" , delete 语句 ] --->> 字段名: " + ele.getName() + ", 删除的值为: " + ele.getValue());
D	102	});
	103	}
	104
	105	if (eventType == CanalEntry.EventType.INSERT) {
	106	rowData.getAfterColumnsList().stream().collect(Collectors.toList()).forEach(ele -> {
	107	System.out.println("[方法: "+method+" ,insert 语句 ] --->> 字段名: " + ele.getName() + ", 新增的值为: " + ele.getValue());
	108	});
	109	}
	110
	111	if (eventType == CanalEntry.EventType.UPDATE) {
	112	for (int i = 0; i < rowData.getAfterColumnsList().size(); i++) {
	113	CanalEntry.Column afterColumn = rowData.getAfterColumnsList().get(i);
	114	CanalEntry.Column beforeColumn = rowData.getBeforeColumnsList().get(i);
	115	System.out.println("[方法: "+method+" , update 语句 ] -->> 字段名," + afterColumn.getName() +
	116	" , 是否修改: " + afterColumn.getUpdated() +
	117	" , 修改前的值: " + beforeColumn.getValue() +
	118	" , 修改后的值: " + afterColumn.getValue());
	119	}
	120	}
	121	}
	122
	123
	124	}
	125
	126
	127
	128	```
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