mysql - Spring Boot JPA saveAll() 插入数据库非常慢

Question

我将 Spring Boot 与 Hibernate 结合使用，为一个简单的 Web 应用程序创建 RESTful API，我在其中读取 .csv 文件并将每一行插入到 mysql 数据库表中。我能够成功 这样做，但对于任何大型 csv 文件来说都需要很长时间。我知道最好对插入语句进行批处理以减少数量 交易，但我认为我不会用我现有的代码来实现这一点。这就是我目前正在做的事情(有效但非常缓慢):

CsvUploaderController.java

public class CsvUploaderController {

    // CsvUploader Repository definition:
    // @Repository
    // public interface CsvUploaderRepository extends JpaRepository<CityObj, Integer>
    @Autowired
    CsvUploaderRepository csvUploaderRepository;

    // gets called by front end with the .csv file data
    @PutMapping("/upload_csv")
    public List<CityObj> uploadCsv(@RequestBody Object data) {
        // unpackCSV converts an arrayList of Objects to a List of CityObj
        List<CityObj> unpackedCSV = unpackCSV((ArrayList<Object>) data);
        csvUploaderRepository.deleteAll(); // delete all rows in table currently. Not sure if this is relevent to issue

        // save all items as rows in my database
        return csvUploaderRepository.saveAll(unpackedCSV); // this is where it takes forever to complete
    }
    ...
}

application.properties:

spring.datasource.url=jdbc:mysql://url.to.my.database
spring.datasource.username=myusername
spring.datasource.password=weirdpassword
spring.datasource.hikari.maximumPoolSize = 5

spring.jpa.properties.hibernate.generate_statistics=true 
spring.jpa.properties.hibernate.jdbc.batch_size=20 // I've tried playing around with different values. Hasnt helped
#spring.jpa.properties.hibernate.order_inserts=true // I've also tried using this but not sure what it does and didnt help

我做错了什么？如何提高 Blade 的性能？我对 saveAll() 的理解是否错误？我的问题与此处描述的非常相似:Spring boot 2 upgrade - spring boot data jpa saveAll() very slow

Answer 1

使用JdbcTemplate，速度更快。

import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.BatchPreparedStatementSetter;

public int[] batchInsert(List<Book> books) {

    return this.jdbcTemplate.batchUpdate(
        "insert into books (name, price) values(?,?)",
        new BatchPreparedStatementSetter() {

            public void setValues(PreparedStatement ps, int i) throws SQLException {
                ps.setString(1, books.get(i).getName());
                ps.setBigDecimal(2, books.get(i).getPrice());
            }

            public int getBatchSize() {
                return books.size();
            }

        });
}