es readme.md
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mcy
@@ -322,3 +322,224 @@ bin/startup.sh
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```
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#### 验证
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修改mysql mytest.user表的数据, 将会自动同步到Oracle的MYTEST.TB_USER表下面, 并会打出DML的log
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## 五、ElasticSearch适配器
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### 5.1 修改启动器配置: application.yml
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```
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server:
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port: 8081
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logging:
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level:
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com.alibaba.otter.canal.client.adapter.es: DEBUG
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spring:
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jackson:
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date-format: yyyy-MM-dd HH:mm:ss
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time-zone: GMT+8
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default-property-inclusion: non_null
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canal.conf:
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canalServerHost: 127.0.0.1:11111
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flatMessage: true
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srcDataSources:
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defaultDS:
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url: jdbc:mysql://127.0.0.1:3306/mytest?useUnicode=true
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username: root
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password: 121212
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canalInstances:
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- instance: example
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adapterGroups:
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- outAdapters:
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- name: es
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hosts: 127.0.0.1:9300 # es 集群地址, 逗号分隔
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properties:
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cluster.name: elasticsearch # es cluster name
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```
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adapter将会自动加载 conf/es 下的所有.yml结尾的配置文件
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### 5.2 适配器表映射文件
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修改 conf/es/mytest_user.yml文件:
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```
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dataSourceKey: defaultDS # 源数据源的key, 对应上面配置的srcDataSources中的值
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destination: example # cannal的instance或者MQ的topic
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esMapping:
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_index: mytest_user # es 的索引名称
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_type: _doc # es 的doc名称
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_id: _id # es 的_id, 如果不配置该项必须配置下面的pk项_id则会由es自动分配
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# pk: id # 如果不需要_id, 则需要指定一个属性为主键属性
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# sql映射
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sql: "select a.id as _id, a.name as _name, a.role_id as _role_id, b.role_name as _role_name,
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a.c_time as _c_time, c.labels as _labels from user a
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left join role b on b.id=a.role_id
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left join (select user_id, group_concat(label order by id desc separator ';') as labels from label
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group by user_id) c on c.user_id=a.id"
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# objFields:
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# _labels: array:; # 数组或者对象属性, array:; 代表以;字段里面是以;分隔的
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# _obj: obj:{"test":"123"}
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etlCondition: "where a.c_time>='{0}'" # etl 的条件参数
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commitBatch: 3000 # 提交批大小
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```
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sql映射说明:
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sql支持多表关联自由组合, 但是有一定的限制:
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1. 主表不能为子查询语句
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2. 只能使用left outer join即最左表一定要是主表
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3. 关联从表如果是子查询不能有多张表
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4. 主sql中不能有where查询条件(从表子查询中可以有where条件但是不推荐, 可能会造成数据同步的不一致, 比如修改了where条件中的字段内容)
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5. 关联条件只允许主外键的'='操作不能出现其他常量判断比如: on a.role_id=b.id and b.statues=1
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6. 关联条件必须要有一个字段出现在主查询语句中比如: on a.role_id=b.id 其中的 a.role_id 或者 b.id 必须出现在主select语句中
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Elastic Search的mapping 属性与sql的查询值将一一对应(不支持 select *), 比如: select a.id as _id, a.name, a.email as _email from user, 其中name将映射到es mapping的name field, _email将
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映射到mapping的_email field, 这里以别名(如果有别名)作为最终的映射字段. 这里的_id可以填写到配置文件的 _id: _id映射.
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#### 5.2.1.单表映射索引示例sql:
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```
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select a.id as _id, a.name, a.role_id, a.c_time from user a
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```
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该sql对应的es mapping示例:
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```
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{
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"mytest_user": {
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"mappings": {
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"_doc": {
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"properties": {
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"name": {
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"type": "text"
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},
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"role_id": {
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"type": "long"
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},
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"c_time": {
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"type": "date"
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}
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}
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}
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}
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}
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}
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```
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#### 5.2.2.单表映射索引示例sql带函数或运算操作:
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```
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select a.id as _id, concat(a.name,'_test') as name, a.role_id+10000 as role_id, a.c_time from user a
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```
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函数字段后必须跟上别名, 该sql对应的es mapping示例:
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```
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{
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"mytest_user": {
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"mappings": {
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"_doc": {
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"properties": {
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"name": {
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"type": "text"
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},
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"role_id": {
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"type": "long"
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},
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"c_time": {
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"type": "date"
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}
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}
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}
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}
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}
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}
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```
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#### 5.2.3.多表映射(一对一, 多对一)索引示例sql:
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```
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select a.id as _id, a.name, a.role_id, b.role_name, a.c_time from user a
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left join role b on b.id = a.role_id
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```
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注:这里join操作只能是left outer join, 第一张表必须为主表!!
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该sql对应的es mapping示例:
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```
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{
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"mytest_user": {
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"mappings": {
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"_doc": {
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"properties": {
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"name": {
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"type": "text"
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},
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"role_id": {
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"type": "long"
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},
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"role_name": {
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"type": "text"
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},
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"c_time": {
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"type": "date"
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}
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}
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}
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}
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}
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}
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```
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#### 5.2.4.多表映射(一对多)索引示例sql:
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```
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select a.id as _id, a.name, a.role_id, c.labels, a.c_time from user a
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left join (select user_id, group_concat(label order by id desc separator ';') as labels from label
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group by user_id) c on c.user_id=a.id
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```
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注:left join 后的子查询只允许一张表, 即子查询中不能再包含子查询或者关联!!
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该sql对应的es mapping示例:
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```
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{
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"mytest_user": {
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"mappings": {
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"_doc": {
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"properties": {
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"name": {
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"type": "text"
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},
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"role_id": {
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"type": "long"
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},
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"c_time": {
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"type": "date"
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},
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"labels": {
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"type": "text"
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}
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}
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}
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}
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}
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}
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```
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#### 5.2.5.其它类型的sql示例:
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- geo type
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```
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select ... concat(IFNULL(a.latitude, 0), ',', IFNULL(a.longitude, 0)) AS location, ...
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```
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- 复合主键
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```
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select concat(a.id,'_',b.type) as _id, ... from user a left join role b on b.id=a.role_id
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```
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- 数组字段
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```
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select a.id as _id, a.name, a.role_id, c.labels, a.c_time from user a
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left join (select user_id, group_concat(label order by id desc separator ';') as labels from label
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group by user_id) c on c.user_id=a.id
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```
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配置中使用:
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```
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objFields:
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labels: array:;
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```
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### 5.3 启动ES数据同步
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#### 启动canal-adapter启动器
|
||||
```
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||||
bin/startup.sh
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||||
```
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||||
#### 验证
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||||
1. 新增mysql mytest.user表的数据, 将会自动同步到es的mytest_user索引下面, 并会打出DML的log
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||||
2. 修改mysql mytest.role表的role_name, 将会自动同步es的mytest_user索引中的role_name数据
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3. 新增或者修改mysql mytest.label表的label, 将会自动同步es的mytest_user索引中的labels数据
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