MYSQL應用
mysql> desc article;
+-------------+--------------+------+-----+--------------------------------+-------+
| Field    | Type     | Null | Key | Default            | Extra |
+-------------+--------------+------+-----+--------------------------------+-------+
| id     | int(11)   | NO  |   | 0               |    |
| title    | mediumtext  | NO  |   | NULL              |    |
| description | mediumtext  | YES |   | NULL              |    |
| author   | varchar(100) | YES |   | NULL              |    |
| source   | varchar(100) | YES |   | NULL              |    |
| content   | longtext   | YES |   | NULL              |    |
| status   | enum('Y','N')| NO  |   | 'N'              |    |
| ctime    | timestamp  | NO  |   | CURRENT_TIMESTAMP       |    |
| mtime    | timestamp  | YES |   | ON UPDATE CURRENT_TIMESTAMP  |    |
+-------------+--------------+------+-----+--------------------------------+-------+
7 rows in set (0.00 sec)

MYSQL應用
jdbc {
  jdbc_driver_library => "/usr/share/java/mysql-connector-java.jar"
  jdbc_driver_class => "com.mysql.jdbc.Driver"
  jdbc_connection_string => "jdbc:mysql://localhost:3306/cms"
  jdbc_user => "cms"
  jdbc_password => "password"
  schedule => "* * * * *" #定時cron的表達式,這里是每分鐘執行一次
  statement => "select * from article where mtime > :sql_last_value"
  use_column_value => true
  tracking_column => "mtime"
  tracking_column_type => "timestamp" 
  record_last_run => true
  last_run_metadata_path => "/var/tmp/article-mtime.last"
 }

MYSQL應用
CREATE TABLE `elasticsearch_trash` (
 `id` int(11) NOT NULL,
 `ctime` timestamp NULL DEFAULT CURRENT_TIMESTAMP,
 PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8

MYSQL應用
CREATE DEFINER=`dba`@`%` TRIGGER `article_BEFORE_UPDATE` BEFORE UPDATE ON `article` FOR EACH ROW
BEGIN
 -- 此處的邏輯是解決文章狀態變為 N 的時候,需要將搜索引擎中對應的數據刪除.
 IF NEW.status = 'N' THEN
 insert into elasticsearch_trash(id) values(OLD.id);
 END IF;
 -- 此處邏輯是修改狀態到 Y 的時候,方式elasticsearch_trash仍然存在該文章ID,導致誤刪除.所以需要刪除回收站中得回收記錄.
  IF NEW.status = 'Y' THEN
 delete from elasticsearch_trash where id = OLD.id;
 END IF;
END
CREATE DEFINER=`dba`@`%` TRIGGER `article_BEFORE_DELETE` BEFORE DELETE ON `article` FOR EACH ROW
BEGIN
 -- 此處邏輯是文章被刪除同事將改文章放入搜索引擎回收站.
 insert into elasticsearch_trash(id) values(OLD.id);
END

MYSQL應用
package cn.netkiller.api.domain.elasticsearch;
import java.util.Date;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;
@Entity
@Table
public class ElasticsearchTrash {
 @Id
 private int id;
 @Column(columnDefinition = "TIMESTAMP DEFAULT CURRENT_TIMESTAMP")
 private Date ctime;
 public int getId() {
 return id;
 }
 public void setId(int id) {
 this.id = id;
 }
 public Date getCtime() {
 return ctime;
 }
 public void setCtime(Date ctime) {
 this.ctime = ctime;
 }
}

MYSQL應用
package cn.netkiller.api.repository.elasticsearch;
import org.springframework.data.repository.CrudRepository;
import com.example.api.domain.elasticsearch.ElasticsearchTrash;
public interface ElasticsearchTrashRepository extends CrudRepository<ElasticsearchTrash, Integer>{
}

MYSQL應用
package cn.netkiller.api.schedule;
import org.elasticsearch.action.delete.DeleteResponse;
import org.elasticsearch.client.transport.TransportClient;
import org.elasticsearch.rest.RestStatus;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;
import com.example.api.domain.elasticsearch.ElasticsearchTrash;
import com.example.api.repository.elasticsearch.ElasticsearchTrashRepository;
@Component
public class ScheduledTasks {
 private static final Logger logger = LoggerFactory.getLogger(ScheduledTasks.class);
 @Autowired
 private TransportClient client;
 @Autowired
 private ElasticsearchTrashRepository alasticsearchTrashRepository;
 public ScheduledTasks() {
 }
 @Scheduled(fixedRate = 1000 * 60) // 60秒運行一次調度任務
 public void cleanTrash() {
 for (ElasticsearchTrash elasticsearchTrash : alasticsearchTrashRepository.findAll()) {
  DeleteResponse response = client.prepareDelete("information", "article", elasticsearchTrash.getId() + "").get();
  RestStatus status = response.status();
  logger.info("delete {} {}", elasticsearchTrash.getId(), status.toString());
  if (status == RestStatus.OK || status == RestStatus.NOT_FOUND) {
  alasticsearchTrashRepository.delete(elasticsearchTrash);
  }
 }
 }
}

MYSQL應用
package cn.netkiller.api;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.scheduling.annotation.EnableScheduling;
@SpringBootApplication
@EnableScheduling
public class Application {
 public static void main(String[] args) {
 SpringApplication.run(Application.class, args);
 }
}