java - Jackson - 双向 - 反序列化父 ID

Question

当我具有双向关系时，我无法使用 json 文件填充实体。

父类:

@Entity
@Table(name = ".....")
public class CpoPipeline implements... {

    private String pipelineId;
    private String pipelineSource;
    private String pipelineVersion;
    private Set<CpoPipelineParameter> cpoPipelineParameters;

    @OneToMany(fetch = FetchType.EAGER, mappedBy = "cpoPipeline")
    public Set<CpoPipelineParameter> getCpoPipelineParameters() {
        return this.cpoPipelineParameters;
    }

子类:

@Entity
@Table(name = ".....")
public class CpoPipelineParameter implements ...{

    private String pipelineParameterId;
    private CpoPipeline cpoPipeline;
    private String pipelineParameterName;
    private String pipelineParameterValue;

    @ManyToOne(fetch = FetchType.EAGER)
    @JoinColumn(name = "pipeline_id", nullable = false)
    @JsonIgnore
    public CpoPipeline getCpoPipeline() {
        return this.cpoPipeline;
    }

Json:

{
    "cpoPipeline": {
    "pipelineId": "1",
    "pipelineSource": "C://",
    "pipelineVersion": "2.0",
    "cpoPipelineParameters": [
        {
        "pipelineParameterId": "2",
        "pipelineParameterName": "Process_Group_Variable_Year",
        "pipelineParameterValue": "2020"
        },
        {
        "pipelineParameterId": "1",
        "pipelineParameterName": "Process_Group_Variable_Directory",
        "pipelineParameterValue": "C://"
        }
    ]
    }
}

当我尝试使用 json 文件填充实体时，父 ID 不会进入子实体。
因此，当我尝试坚持时，我收到错误:

17:26:54.714 [main] ERROR o.h.e.jdbc.spi.SqlExceptionHelper - NULL not allowed for column "PIPELINE_ID";
SQL statement:insert into cpo_pipeline_parameter (pipeline_id, pipeline_parameter_name, pipeline_parameter_value, pipeline_parameter_id) values (?, ?, ?, ?)

Answer 1

您需要为每个CpoPipelineParameter设置CpoPipeline。在双向关系中，如果您想将父级与子级保存在一起，则必须为每个子级设置父级以使双方同步。

cpoPipeline.getCpoPipelineParameters().forEach(d -> d.setCpoPipeline(cpoPipeline));