Spring data jpa怎麼配置一個實體類映射兩張資料庫表

今天寫一個Spring boot內建Spring data jpa實作一些簡單功能的技術驗證項目，其中一個Model類Wel映射了“T_PM_WELL”表，但有一個屬性"sname"需要映射到第二張表“T_PM_NODE”上，開始時用@Formula注解來實作，但運作時總是會報錯，百度了很久也沒解決，後來下了jpa的文檔，發現了"@SecondaryTable"注解正适合我的場景下使用，而@Formula通常用來映射到一個虛拟列上，而非實際存在的列，例如需要查詢一個count(*)，然後儲存到某個屬性上時，就應該用@Formula注解，但因為我還不知道怎麼正确使用這個注解，今天就略過這個注解不講了，直接上代碼，看下@SecondaryTable注解的使用吧

@Entity
@Table(name="T_PM_WELL")
@SecondaryTable(name="T_PM_NODE")
public class Well {

    @Id
    @Column(name="WELL_ID")
    private Integer wellId;

    @Column(name="WELLTYPE_ID")
    private Integer wellTypeId;

    @Column(name="WELLDIST_ID")
    private Integer wellDistId;

    @Column(name="WELLMODEL_ID")
    private Integer wellModelId;

    @Column(name="BLOCK_ID")
    private Integer blockId;

    @Column(name="GEOLOGY_ID")
    private Integer geologyId;

    @Column(name="WELLFINISH_ID")
    private Integer wellFinishId;

    @Column(name="PLATFORM_ID")
    private Integer platformId;

    @Column(name="PROGEOLOGY_ID")
    private Integer progeologyId;

    @Column(name="MINING_METHOD")
    private Integer miningMethod;

    @Column(name="WELL_DEPTH")
    private String wellDepth;

    @Column(name="WORK_SEGMENT")
    private String workSegment;

    @Column(name="PRODUCT_START_DATE")
    private Date productStartDate;

    @Column(name="ON_OFF")
    private Integer onOff;

    @Column(name="METE_TYPE")
    private Integer meteType;

    @Column(name="SEGREGATOR_EQUIP_CODE")
    private String segregatorEquipCode;

    @Column(name="INST_INSTR_ID")
    private String instInstrId;

    @Column(name="ACCU_INSTR_ID")
    private String accuInstrId;

    @Column(name="FURNACE_EQUIP_CODE")
    private String furnaceEquipCode;

    @Column(name="USEGAS_INSTR_ID")
    private String usegasInstrId;

    @Column(name="ACCU_WATERINSTR_ID")
    private String accuWaterinstrId;

    @Column(name="INST_WATERINSTR_ID")
    private String instWaterinstrId;

    @Column(name="SNAME", table="T_PM_NODE")
    private String sName;


    public String getsName() {
        return sName;
    }


    public void setsName(String sName) {
        this.sName = sName;
    }


    public Integer getWellId() {
        return wellId;
    }


    public Integer getWellTypeId() {
        return wellTypeId;
    }


    public Integer getWellDistId() {
        return wellDistId;
    }


    public Integer getWellModelId() {
        return wellModelId;
    }


    public Integer getBlockId() {
        return blockId;
    }


    public Integer getGeologyId() {
        return geologyId;
    }


    public Integer getWellFinishId() {
        return wellFinishId;
    }


    public Integer getPlatformId() {
        return platformId;
    }


    public Integer getProgeologyId() {
        return progeologyId;
    }


    public Integer getMiningMethod() {
        return miningMethod;
    }


    public String getWellDepth() {
        return wellDepth;
    }


    public String getWorkSegment() {
        return workSegment;
    }


    public Date getProductStartDate() {
        return productStartDate;
    }


    public Integer getOnOff() {
        return onOff;
    }


    public Integer getMeteType() {
        return meteType;
    }


    public String getSegregatorEquipCode() {
        return segregatorEquipCode;
    }


    public String getInstInstrId() {
        return instInstrId;
    }


    public String getAccuInstrId() {
        return accuInstrId;
    }


    public String getFurnaceEquipCode() {
        return furnaceEquipCode;
    }


    public String getUsegasInstrId() {
        return usegasInstrId;
    }


    public String getAccuWaterinstrId() {
        return accuWaterinstrId;
    }


    public String getInstWaterinstrId() {
        return instWaterinstrId;
    }


    public void setWellId(Integer wellId) {
        this.wellId = wellId;
    }


    public void setWellTypeId(Integer wellTypeId) {
        this.wellTypeId = wellTypeId;
    }


    public void setWellDistId(Integer wellDistId) {
        this.wellDistId = wellDistId;
    }


    public void setWellModelId(Integer wellModelId) {
        this.wellModelId = wellModelId;
    }


    public void setBlockId(Integer blockId) {
        this.blockId = blockId;
    }


    public void setGeologyId(Integer geologyId) {
        this.geologyId = geologyId;
    }


    public void setWellFinishId(Integer wellFinishId) {
        this.wellFinishId = wellFinishId;
    }


    public void setPlatformId(Integer platformId) {
        this.platformId = platformId;
    }


    public void setProgeologyId(Integer progeologyId) {
        this.progeologyId = progeologyId;
    }


    public void setMiningMethod(Integer miningMethod) {
        this.miningMethod = miningMethod;
    }


    public void setWellDepth(String wellDepth) {
        this.wellDepth = wellDepth;
    }


    public void setWorkSegment(String workSegment) {
        this.workSegment = workSegment;
    }


    public void setProductStartDate(Date productStartDate) {
        this.productStartDate = productStartDate;
    }


    public void setOnOff(Integer onOff) {
        this.onOff = onOff;
    }


    public void setMeteType(Integer meteType) {
        this.meteType = meteType;
    }


    public void setSegregatorEquipCode(String segregatorEquipCode) {
        this.segregatorEquipCode = segregatorEquipCode;
    }


    public void setInstInstrId(String instInstrId) {
        this.instInstrId = instInstrId;
    }


    public void setAccuInstrId(String accuInstrId) {
        this.accuInstrId = accuInstrId;
    }


    public void setFurnaceEquipCode(String furnaceEquipCode) {
        this.furnaceEquipCode = furnaceEquipCode;
    }


    public void setUsegasInstrId(String usegasInstrId) {
        this.usegasInstrId = usegasInstrId;
    }


    public void setAccuWaterinstrId(String accuWaterinstrId) {
        this.accuWaterinstrId = accuWaterinstrId;
    }


    public void setInstWaterinstrId(String instWaterinstrId) {
        this.instWaterinstrId = instWaterinstrId;
    }
}
           

還有一個@SecondaryTables注解用來映射多張表的，因為我今天用不上，是以沒有具體使用的代碼可貼，具體使用可以看下jpa的文檔

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