云数据库 OceanBase：SpringBatch 连接 OceanBase 数据库

<dependency>
	<groupId>org.springframework.boot</groupId>
	<artifactId>spring-boot-starter-batch</artifactId>
</dependency>
<!--数据库驱动-->
<dependency>
	<groupId>mysql</groupId>
	<artifactId>mysql-connector-java</artifactId>
<version>8.0.25</version>
</dependency>
<!--连接池-->
<dependency>
	<groupId>com.alibaba</groupId>
	<artifactId>druid</artifactId>
<version>1.1.22</version>
</dependency>
<!--基于实体类自动建表-->
<dependency>
	<groupId>org.springframework.boot</groupId>
	<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>

<!--spring-boot核心等其他依赖省略。。。。-->

#yml 文件：
spring:
  datasource:
    url: jdbc:oceanbase://xxx.xxx.xxx.xxx:3306/test
    driver-class-name: com.mysql.cj.jdbc.Driver
    username: a****
    password: ******
  jpa:
    hibernate:
      ddl-auto: update

示例代码

通过调用数据库写入类方法写入数据，具体步骤如下：

1. 创建需要的类。

   实体类：People 和 PeopleDESC。

   //基本 people 类
   
   @Entity
   @Table(name = "PEOPLE")
   public class People {
       @Id
       @GeneratedValue
       private int id;
       private String lastName;
       private String firstName;
       //略
   }

   //加工后的 peopledesc 类(增加 desc 属性)
   
   @Entity
   @Table(name = "OK_PEOPLE")
   public class PeopleDESC {
   
       @Id
       @GeneratedValue  //strategy = AUTO / IDENTITY / SEQUENCE  三种主键生成策略均不支持
       private int id;
       private String lastName;
       private String firstName;
       private String desc1;
       //略
   }

   批处理类：AddPeopleDescProcessor 和 AddDescPeopleWriter。

   //用于给 people 添加 desc 属性返回一个 peopledesc 类的处理器
   
   public class AddPeopleDescProcessor implements ItemProcessor<People, PeopleDESC> {
   
       public PeopleDESC process(People item) throws Exception {
   
           return new PeopleDESC(item.getId() , 
                                 item.getLastName(), 
                                 item.getFirstName(), 
                                 Thread.currentThread().getName());
       }
   }

2. 将 peopledesc 写入数据库的类。

   //将 peopledesc 写入数据库的类
   
   public class AddDescPeopleWriter implements ItemWriter<PeopleDESC> {
       private JdbcTemplate jdbcTemplate;
       public void setDataSource(DataSource dataSource) {
           this.jdbcTemplate = new JdbcTemplate(dataSource);
       }
   
       public JdbcTemplate getJdbcTemplate() {
           return jdbcTemplate;
       }
   
       public void write(List<? extends PeopleDESC> items) throws Exception {
           for (PeopleDESC peopleDESC : items) {
               this.jdbcTemplate
                   .update("insert into ok_people (id,first_name,last_name,desc1) values (?, ?, ?, ?)",
                           peopleDESC.getId(), peopleDESC.getFirstName(),
                           peopleDESC.getLastName(), peopleDESC.getDesc());
           }
       }
   }

3. 启动工程 spring-data-jpa 会根据实体类 People 及 PeopleDESC 自动建表，示例结果如下。

   

4. 批量添加测试数据至 people。

   public void addData(){
       jdbcTemplate = new JdbcTemplate(dataSource);
       StringBuilder stringBuilder = new StringBuilder("");
       for (int i = 1 ; i<=100 ; i++){
           stringBuilder.append("insert into people values ("+i+",'first_test"+i+"','last_test"+i+"');");
           jdbcTemplate.execute(stringBuilder.toString());
           stringBuilder.delete(0, stringBuilder.length());
       }
   }

   测试下结果，显示如下：

   

5. 执行批处理方法。

   public void writerTest() throws Exception {
       //获得 people 表的结果集
       String sql = "select * from people;";
       preparedStatement = dataSource.getConnection().prepareStatement(sql);
       ResultSet resultSet = preparedStatement.executeQuery();
       List list = new ArrayList<PeopleDESC>();
       //基于添加 desc 属性的处理器对结果集进行加工，并封装成一个 List<PeopleDESC>
       while (resultSet.next()){
           People people = peopleRowMapper.mapRow(resultSet, resultSet.getRow());
           PeopleDESC desc = addPeopleDescProcessor.process(people);
           list.add(desc);
       }
       //调用数据库写入类方法写入数据
       addDescPeopleWriter.setDataSource(dataSource);
       addDescPeopleWriter.write(list);
   }