spring data jpa save 手动分配标识符

Question

我使用 spring 保存

  HighWay highWay = new HighWay();
     highWay.setId("000");
    HighWayRepository hRepository = (HighWayRepository) context
                    .getBean("highWayRepository");
            hRepository.save(highWay);
            hRepository.flush();


    public interface HighWayRepository extends JpaRepository<HighWay, String> {

    }

table 就像 f_id varchar(256) NOT NULL,

public class HighWay {
    @Id
    @Column(name="f_id")
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private String id;}

但抛出异常

Caused by: java.sql.SQLException: Field 'f_id' doesn't have a default value at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:946) at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:2870) at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1573) at com.mysql.jdbc.ServerPreparedStatement.serverExecute(ServerPreparedStatement.java:1169) at com.mysql.jdbc.ServerPreparedStatement.executeInternal(ServerPreparedStatement.java:693) at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:1404) at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:1318) at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:1303) at com.alibaba.druid.pool.DruidPooledPreparedStatement.executeUpdate(DruidPooledPreparedStatement.java:253) at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.executeUpdate(ResultSetReturnImpl.java:208) ... 51 more

我查看文档， Id-Property 检查（默认）默认情况下 Spring Data JPA 检查给定实体的 Id-Property。如果 Id-Property 为 null，则该实体将被假定为新的，否则为非新的。

sql 就像 Hibernate：insert into us_highway (blockTime, blockType, endNum, predictTime, publishTime, roadName, situation, startNum, tips) values (?, ?, ?, ?, ?, ?, ?, ?, ?) 不是 id 是 insert!

因为我想手动分配id，如果是new，id属性不为null，如何配置保存？

Answer 1

如果您在 id 注释下方分配 Id manually.Remove。

@GeneratedValue(strategy = GenerationType.IDENTITY)

spring data jpa save 手动分配标识符

spring data jpa save manually assign identifier

spring

spring-data

spring-data-jpa