spring batch 框架进行元数据管理表 mysql

使用Spring Batch框架进行元数据管理表MySQL的实现

1. 简介

在进行大规模数据处理时，Spring Batch框架是一个非常有用的工具。它提供了一个强大的批处理框架，可以轻松地处理大量的数据，并具备事务管理、监控、错误处理等功能。为了进行元数据管理，我们可以使用MySQL数据库来存储和管理Spring Batch的元数据信息。

2. 实现步骤

CREATE DATABASE spring_batch_metadata;

| 2. 创建元数据表 | 在前一步创建的数据库中创建Spring Batch的元数据表。可以使用以下SQL语句： |
| | ```sql
CREATE TABLE `spring_batch_metadata`.`BATCH_JOB_INSTANCE` (
  `JOB_INSTANCE_ID` BIGINT NOT NULL,
  `VERSION` BIGINT,
  `JOB_NAME` VARCHAR(100) NOT NULL,
  `JOB_KEY` VARCHAR(32) NOT NULL,
  PRIMARY KEY (`JOB_INSTANCE_ID`),
  UNIQUE INDEX `JOB_NAME_UNIQUE` (`JOB_NAME`)
);

CREATE TABLE `spring_batch_metadata`.`BATCH_JOB_EXECUTION` (
  `JOB_EXECUTION_ID` BIGINT NOT NULL,
  `VERSION` BIGINT,
  `JOB_INSTANCE_ID` BIGINT NOT NULL,
  `CREATE_TIME` DATETIME NOT NULL,
  `START_TIME` DATETIME DEFAULT NULL,
  `END_TIME` DATETIME DEFAULT NULL,
  `STATUS` VARCHAR(10),
  `EXIT_CODE` VARCHAR(2500),
  `EXIT_MESSAGE` VARCHAR(2500),
  `LAST_UPDATED` DATETIME,
  `JOB_CONFIGURATION_LOCATION` VARCHAR(2500) NULL,
  PRIMARY KEY (`JOB_EXECUTION_ID`),
  INDEX `JOB_INST_EXEC_FK` (`JOB_INSTANCE_ID`),
  CONSTRAINT `JOB_INST_EXEC_FK` FOREIGN KEY (`JOB_INSTANCE_ID`)
  REFERENCES `spring_batch_metadata`.`BATCH_JOB_INSTANCE` (`JOB_INSTANCE_ID`)
);

CREATE TABLE `spring_batch_metadata`.`BATCH_STEP_EXECUTION` (
  `STEP_EXECUTION_ID` BIGINT NOT NULL,
  `VERSION` BIGINT,
  `STEP_NAME` VARCHAR(100) NOT NULL,
  `JOB_EXECUTION_ID` BIGINT NOT NULL,
  `START_TIME` DATETIME NOT NULL,
  `END_TIME` DATETIME DEFAULT NULL,
  `STATUS` VARCHAR(10),
  `COMMIT_COUNT` BIGINT,
  `READ_COUNT` BIGINT,
  `FILTER_COUNT` BIGINT,
  `WRITE_COUNT` BIGINT,
  `EXIT_CODE` VARCHAR(2500),
  `EXIT_MESSAGE` VARCHAR(2500),
  `LAST_UPDATED` DATETIME,
  PRIMARY KEY (`STEP_EXECUTION_ID`),
  INDEX `JOB_EXEC_STEP_FK` (`JOB_EXECUTION_ID`),
  CONSTRAINT `JOB_EXEC_STEP_FK` FOREIGN KEY (`JOB_EXECUTION_ID`)
  REFERENCES `spring_batch_metadata`.`BATCH_JOB_EXECUTION` (`JOB_EXECUTION_ID`)
);
``` |
| 3. 配置数据源 | 在Spring Boot项目的配置文件（如application.properties或application.yml）中配置数据源信息，用于连接到MySQL数据库。例如： |
| | ```properties
spring.datasource.url=jdbc:mysql://localhost:3306/spring_batch_metadata
spring.datasource.username=root
spring.datasource.password=your_password
``` |
| 4. 配置Spring Batch | 在Spring Boot项目的配置类中配置Spring Batch以使用MySQL数据库作为元数据存储。可以使用以下代码： |

```java
@Configuration
@EnableBatchProcessing
public class BatchConfig {

    @Autowired
    private JobRepository jobRepository;

    @Autowired
    private PlatformTransactionManager transactionManager;

    @Bean
    public JobRepository jobRepository(DataSource dataSource, PlatformTransactionManager transactionManager) throws Exception {
        JobRepositoryFactoryBean jobRepositoryFactoryBean = new JobRepositoryFactoryBean();
        jobRepositoryFactoryBean.setDataSource(dataSource);
        jobRepositoryFactoryBean.setTransactionManager(transactionManager);
        jobRepositoryFactoryBean.setDatabaseType(DatabaseType.MYSQL.name());
        return jobRepositoryFactoryBean.getObject();
    }

    @Bean
    public JobLauncher jobLauncher(JobRepository jobRepository) {
        SimpleJobLauncher jobLauncher = new SimpleJobLauncher();
        jobLauncher.setJobRepository(jobRepository);
        return jobLauncher;
    }

    @Bean
    public StepBuilderFactory stepBuilderFactory(JobRepository jobRepository, PlatformTransactionManager transactionManager) {
        return new StepBuilderFactory(jobRepository, transactionManager);
    }

    @Bean
    public JobBuilderFactory jobBuilderFactory(JobRepository jobRepository) {
        return new JobBuilderFactory(jobRepository);
    }
}

| 5. 编写批处理任务 | 编写自定义的批处理任务，并通过上述配置中的JobBuilderFactory和StepBuilderFactory构建Job和Step。可以使用以下代码示例： |

@Configuration
public class BatchJob