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

duxinglangzi

2022-06-24 a87aa74a3af27960276ed02f4273386d25d2a231

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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
	19
	20	```
	21
	22	### 在spring boot 项目中的代码使用实例
	23	```java
	24
	25
	26	import com.alibaba.otter.canal.protocol.CanalEntry;
	27	import com.duxinglangzi.canal.starter.annotation.CanalListener;
	28	import com.duxinglangzi.canal.starter.annotation.CanalUpdateListener;
	29	import org.springframework.stereotype.Service;
	30
	31	import java.util.stream.Collectors;
	32
	33	/**
	34	* @author wuqiong 2022/4/12
	35	* @description
	36	*/
	37	@Service
	38	public class CanalListenerTest {
	39
	40	/**
627420	41	* 目前 Listener 方法的参数必须为 CanalEntry.EventType , CanalEntry.RowData
de8c2b	42	* 程序在启动过程中会做检查
D	43	*/
a87aa7	44
D	45	/**
	46	* 监控更新操作
	47	* 支持动态参数配置，配置项需在 yml 或 properties 进行配置
	48	* 目标是 ${prod.example} 的 ${prod.database} 库 users表
	49	*/
	50	@CanalUpdateListener(destination = "${prod.example}", database = "${prod.database}", table = {"users"})
	51	public void listenerExampleBooksUsers(CanalEntry.EventType eventType, CanalEntry.RowData rowData) {
	52	printChange("listenerExampleBooksUsers",eventType, rowData);
	53	}
de8c2b	54
D	55	/**
	56	* 监控更新操作，目标是 example的 books库 users表
	57	*/
	58	@CanalUpdateListener(destination = "example", database = "books", table = {"users"})
	59	public void listenerExampleBooksUsers(CanalEntry.EventType eventType, CanalEntry.RowData rowData) {
	60	printChange("listenerExampleBooksUsers",eventType, rowData);
	61	}
	62
	63	/**
	64	* 监控更新操作，目标是 example的 books库 books表
	65	*/
	66	@CanalUpdateListener(destination = "example", database = "books", table = {"books"})
	67	public void listenerExampleBooksBooks(CanalEntry.EventType eventType, CanalEntry.RowData rowData) {
	68	printChange("listenerExampleBooksBooks",eventType, rowData);
	69	}
	70
	71	/**
	72	* 监控更新操作，目标是 example的 books库的所有表
	73	*/
	74	@CanalListener(destination = "example", database = "books", eventType = CanalEntry.EventType.UPDATE)
	75	public void listenerExampleBooksAll(CanalEntry.EventType eventType, CanalEntry.RowData rowData) {
	76	printChange("listenerExampleBooksAll",eventType, rowData);
	77	}
	78
	79	/**
	80	* 监控更新操作，目标是 example的所有库的所有表
	81	*/
	82	@CanalListener(destination = "example", eventType = CanalEntry.EventType.UPDATE)
	83	public void listenerExampleAll(CanalEntry.EventType eventType, CanalEntry.RowData rowData) {
	84	printChange("listenerExampleAll",eventType, rowData);
	85	}
	86
	87	/**
	88	* 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
	89	*/
	90	@CanalListener(eventType = {CanalEntry.EventType.UPDATE, CanalEntry.EventType.INSERT, CanalEntry.EventType.DELETE})
	91	public void listenerAllDml(CanalEntry.EventType eventType, CanalEntry.RowData rowData) {
	92	printChange("listenerAllDml",eventType, rowData);
	93	}
	94
	95	public void printChange(String method,CanalEntry.EventType eventType, CanalEntry.RowData rowData) {
	96	if (eventType == CanalEntry.EventType.DELETE) {
af6d64	97	rowData.getBeforeColumnsList().stream().collect(Collectors.toList()).forEach(ele -> {
de8c2b	98	System.out.println("[方法: "+method+" , delete 语句 ] --->> 字段名: " + ele.getName() + ", 删除的值为: " + ele.getValue());
D	99	});
	100	}
	101
	102	if (eventType == CanalEntry.EventType.INSERT) {
	103	rowData.getAfterColumnsList().stream().collect(Collectors.toList()).forEach(ele -> {
	104	System.out.println("[方法: "+method+" ,insert 语句 ] --->> 字段名: " + ele.getName() + ", 新增的值为: " + ele.getValue());
	105	});
	106	}
	107
	108	if (eventType == CanalEntry.EventType.UPDATE) {
	109	for (int i = 0; i < rowData.getAfterColumnsList().size(); i++) {
	110	CanalEntry.Column afterColumn = rowData.getAfterColumnsList().get(i);
	111	CanalEntry.Column beforeColumn = rowData.getBeforeColumnsList().get(i);
	112	System.out.println("[方法: "+method+" , update 语句 ] -->> 字段名," + afterColumn.getName() +
	113	" , 是否修改: " + afterColumn.getUpdated() +
	114	" , 修改前的值: " + beforeColumn.getValue() +
	115	" , 修改后的值: " + afterColumn.getValue());
	116	}
	117	}
	118	}
	119
	120
	121	}
	122
	123
	124
	125	```
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