我正在使用Spring批处理将数据从csv文件转储到数据库，但每当我运行我的springboot应用程序时，csv文件中的数据不断追加到数据库。

每当我运行我的springboot应用程序时，csv文件中的数据不断地附加到数据库中。

@Bean
    public Job importUserJob(JobCompletionNotificationListener listener) {
        return jobBuilderFactory.get("importUserJob")
                .incrementer(new RunIdIncrementer())
                .listener(listener)
                .flow(step1())
                .end()
                .build();
    }

应用.属性

server.port=8080
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/database
spring.datasource.username=root
spring.datasource.password=root

spring.jpa.hibernate.ddl-auto=update
spring.jpa.show-sql=true

spring.mvc.throw-exception-if-no-handler-found=true
spring.web.resources.add-mappings=false

spring.batch.jdbc.initialize-schema=always
spring.datasource.initialize=true
spring.sql.init.schema-locations=classpath:schema.sql
spring.mvc.pathmatch.matching-strategy= ANT_PATH_MATCHER

itemreader

@Bean
public FlatFileItemReader<Covid> reader() {
    FlatFileItemReader<Covid> reader = new FlatFileItemReader<>();
    reader.setResource(new ClassPathResource("Cdata.csv"));
    reader.setLinesToSkip(1);
    reader.setLineMapper(new DefaultLineMapper<Covid>() {{
        setLineTokenizer(new DelimitedLineTokenizer() {{
            setDelimiter(",");
            setStrict(false);
            setNames(new String[] {"id","firstname",lastname,ph});
            setIncludedFields(new int[] {0,1,2,3});
        }});
        setFieldSetMapper(new BeanWrapperFieldSetMapper<Covid>() {{
         setTargetType(Covid.class);
        }});
    }});
    return reader;
}