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

duxinglangzi

2022-09-06 ed3a1614384279b7d3a97e7411b649476a934ddb

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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
c83c1b	19	prod:
D	20	example: example
	21	database: books
de8c2b	22
D	23	```
	24
a8f947	25	### 在spring boot 项目中的代码使用实例 (注意需要使用 EnableCanalListener 注解开启 canal listener )
D	26
de8c2b	27	```java
D	28
	29
	30	import com.alibaba.otter.canal.protocol.CanalEntry;
c83c1b	31	import com.duxinglangzi.canal.starter.annotation.CanalInsertListener;
de8c2b	32	import com.duxinglangzi.canal.starter.annotation.CanalListener;
D	33	import com.duxinglangzi.canal.starter.annotation.CanalUpdateListener;
a8f947	34	import com.duxinglangzi.canal.starter.annotation.EnableCanalListener;
c83c1b	35	import com.duxinglangzi.canal.starter.mode.CanalMessage;
de8c2b	36	import org.springframework.stereotype.Service;
D	37
	38	import java.util.stream.Collectors;
	39
	40	/**
	41	* @author wuqiong 2022/4/12
	42	* @description
	43	*/
a8f947	44	@EnableCanalListener
de8c2b	45	@Service
D	46	public class CanalListenerTest {
	47
	48	/**
c83c1b	49	* 必须在类上使用 EnableCanalListener 注解才能开启 canal listener
D	50	*
	51	* 目前 Listener 方法的参数必须为 com.duxinglangzi.canal.starter.mode.CanalMessage
de8c2b	52	* 程序在启动过程中会做检查
D	53	*/
a8f947	54
a87aa7	55	/**
D	56	* 监控更新操作
	57	* 支持动态参数配置，配置项需在 yml 或 properties 进行配置
	58	* 目标是 ${prod.example} 的 ${prod.database} 库 users表
	59	*/
	60	@CanalUpdateListener(destination = "${prod.example}", database = "${prod.database}", table = {"users"})
c83c1b	61	public void listenerExampleBooksUsers(CanalMessage message) {
D	62	printChange("listenerExampleBooksUsers", message);
a87aa7	63	}
de8c2b	64
D	65	/**
	66	* 监控更新操作，目标是 example的 books库 users表
	67	*/
c83c1b	68	@CanalInsertListener(destination = "example", database = "books", table = {"users"})
D	69	public void listenerExampleBooksUser(CanalMessage message) {
	70	printChange("listenerExampleBooksUsers", message);
de8c2b	71	}
D	72
	73	/**
	74	* 监控更新操作，目标是 example的 books库 books表
	75	*/
	76	@CanalUpdateListener(destination = "example", database = "books", table = {"books"})
c83c1b	77	public void listenerExampleBooksBooks(CanalMessage message) {
D	78	printChange("listenerExampleBooksBooks", message);
de8c2b	79	}
D	80
	81	/**
	82	* 监控更新操作，目标是 example的 books库的所有表
	83	*/
	84	@CanalListener(destination = "example", database = "books", eventType = CanalEntry.EventType.UPDATE)
c83c1b	85	public void listenerExampleBooksAll(CanalMessage message) {
D	86	printChange("listenerExampleBooksAll", message);
de8c2b	87	}
D	88
	89	/**
	90	* 监控更新操作，目标是 example的所有库的所有表
	91	*/
	92	@CanalListener(destination = "example", eventType = CanalEntry.EventType.UPDATE)
c83c1b	93	public void listenerExampleAll(CanalMessage message) {
D	94	printChange("listenerExampleAll", message);
de8c2b	95	}
D	96
	97	/**
	98	* 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
	99	*/
	100	@CanalListener(eventType = {CanalEntry.EventType.UPDATE, CanalEntry.EventType.INSERT, CanalEntry.EventType.DELETE})
c83c1b	101	public void listenerAllDml(CanalMessage message) {
D	102	printChange("listenerAllDml", message);
de8c2b	103	}
D	104
c83c1b	105	public void printChange(String method, CanalMessage message) {
D	106	CanalEntry.EventType eventType = message.getEventType();
	107	CanalEntry.RowData rowData = message.getRowData();
	108
	109
	110	System.out.println(" >>>>>>>>>>>>>[当前数据库: "+message.getDataBaseName()+" ," +
	111	"数据库表名: " + message.getTableName() + " , " +
	112	"方法: " + method );
	113
de8c2b	114	if (eventType == CanalEntry.EventType.DELETE) {
af6d64	115	rowData.getBeforeColumnsList().stream().collect(Collectors.toList()).forEach(ele -> {
a8f947	116	System.out.println("[方法: " + method + " , delete 语句 ] --->> 字段名: " + ele.getName() + ", 删除的值为: " + ele.getValue());
de8c2b	117	});
D	118	}
	119
	120	if (eventType == CanalEntry.EventType.INSERT) {
	121	rowData.getAfterColumnsList().stream().collect(Collectors.toList()).forEach(ele -> {
a8f947	122	System.out.println("[方法: " + method + " ,insert 语句 ] --->> 字段名: " + ele.getName() + ", 新增的值为: " + ele.getValue());
de8c2b	123	});
D	124	}
	125
	126	if (eventType == CanalEntry.EventType.UPDATE) {
	127	for (int i = 0; i < rowData.getAfterColumnsList().size(); i++) {
	128	CanalEntry.Column afterColumn = rowData.getAfterColumnsList().get(i);
	129	CanalEntry.Column beforeColumn = rowData.getBeforeColumnsList().get(i);
a8f947	130	System.out.println("[方法: " + method + " , update 语句 ] -->> 字段名," + afterColumn.getName() +
de8c2b	131	" , 是否修改: " + afterColumn.getUpdated() +
D	132	" , 修改前的值: " + beforeColumn.getValue() +
	133	" , 修改后的值: " + afterColumn.getValue());
	134	}
	135	}
	136	}
	137
	138
	139	}
	140
	141
	142
	143	```
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