SpringBoot JPA 表关联查询实例

package cms.model; 
import cms.model.base.BaseDomain; 
import org.hibernate.annotations.GenericGenerator; 
 
import javax.persistence.*; 
import java.io.Serializable; 
import java.util.List; 
/** 
 * Created by Roney on 2016/10/10. 
 * 楼层管理 
 * 
 */ 
@Entity 
@Table(indexes = {@Index(name = "idx_floor_user",columnList = "user_id")}) 
public class Floor extends BaseDomain implements Serializable { 
 
  @Id 
  @GenericGenerator(name = "PKUUID", strategy = "uuid2") 
  @GeneratedValue(generator = "PKUUID") 
  @Column(length = 36) 
  protected String id; 
 
  /** 
   * 发布用户ID 
   */ 
  @Column(length = 36,name = "user_id") 
  private String userId; 
 
  /** 
   * 楼层名称 
   */ 
  private String name; 
 
  /** 
   * 楼层的模板路径 
   */ 
  private String templateUrl; 
 
  /** 
   * 类型 
   * 1.管理端 
   * 2.供应商 
   */ 
  private Integer type; 
 
 
  /** 
   * 排序 
   */ 
  @Column(name = "show_index", nullable = false) 
  private Integer showIndex; 
 
  /** 
   * 是否禁用 
   * */ 
 
 
  @Column(nullable = false) 
  private Boolean isDisable=false; 
 
  @OneToMany(fetch = FetchType.LAZY,mappedBy = "floor") 
  private List<FloorContent> floorContents; 
 
  public List<FloorContent> getFloorContents() { 
    return floorContents; 
  } 
 
  public void setFloorContents(List<FloorContent> floorContents) { 
    this.floorContents = floorContents; 
  } 
 
  public String getId() { 
    return id; 
  } 
 
  public void setId(String id) { 
    this.id = id; 
  } 
 
  public String getUserId() { 
    return userId; 
  } 
 
  public void setUserId(String userId) { 
    this.userId = userId; 
  } 
 
  public String getName() { 
    return name; 
  } 
 
  public void setName(String name) { 
    this.name = name; 
  } 
 
  public String getTemplateUrl() { 
    return templateUrl; 
  } 
 
  public void setTemplateUrl(String templateUrl) { 
    this.templateUrl = templateUrl; 
  } 
 
  public Integer getShowIndex() { 
    return showIndex; 
  } 
 
  public void setShowIndex(Integer showIndex) { 
    this.showIndex = showIndex; 
  } 
 
  public Boolean getDisable() { 
    return isDisable; 
  } 
 
  public void setDisable(Boolean disable) { 
    isDisable = disable; 
  } 
 
  @Override 
  public boolean equals(Object o) { 
    if (this == o) return true; 
    if (o == null || getClass() != o.getClass()) return false; 
 
    Floor floor = (Floor) o; 
 
    return id != null ? id.equals(floor.id) : floor.id == null; 
 
  } 
 
  @Override 
  public int hashCode() { 
    return id != null ? id.hashCode() : 0; 
  } 
} 

package cms.model; 
 
import cms.model.base.BaseDomain; 
import org.hibernate.annotations.GenericGenerator; 
 
import javax.persistence.*; 
import java.io.Serializable; 
 
/** 
 * Created by Roney on 2016/10/10. 
 * 楼层的内容 
 */ 
 
@Entity 
@Table(indexes = {@Index(name = "idx_floor_content_user", columnList = "user_id")}) 
public class FloorContent extends BaseDomain implements Serializable { 
 
  @Id 
  @GenericGenerator(name = "PKUUID", strategy = "uuid2") 
  @GeneratedValue(generator = "PKUUID") 
  @Column(length = 36) 
  protected String id; 
 
  /** 
   * 发布用户ID 
   */ 
  @Column(length = 36, name = "user_id") 
  private String userId; 
 
  /** 
   * 內容名稱 
   */ 
  private String name; 
 
  /** 
   * 
   * 內容圖片 
   */ 
  @Column(length = 256) 
  private String contentImageUrl; 
 
  /** 
   * 類型 
   * 1.超鏈接 
   * 2.圖片檢索 
   */ 
  private Integer type; 
 
  /** 
   * 超鏈接url 
   */ 
  private String linkUrl; 
 
  /** 
   * 圖片檢索內容 
   */ 
  private String picSearchContent; 
 
  /** 
   * 排序 
   */ 
  @Column(name = "show_index", nullable = false) 
  private Integer showIndex; 
 
  /** 
   * 是否禁用 
   */ 
 
  @Column(nullable = false) 
  private Boolean isDisable = false; 
 
  @ManyToOne 
  @JoinColumn(name = "floor_id",foreignKey = @ForeignKey(name = "fk_floor_fc")) 
  private Floor floor; 
 
  public Floor getFloor() { 
    return floor; 
  } 
 
  public void setFloor(Floor floor) { 
    this.floor = floor; 
  } 
 
  public String getId() { 
    return id; 
  } 
 
  public void setId(String id) { 
    this.id = id; 
  } 
 
  public String getUserId() { 
    return userId; 
  } 
 
  public void setUserId(String userId) { 
    this.userId = userId; 
  } 
 
  public String getName() { 
    return name; 
  } 
 
  public void setName(String name) { 
    this.name = name; 
  } 
 
  public String getContentImageUrl() { 
    return contentImageUrl; 
  } 
 
  public void setContentImageUrl(String contentImageUrl) { 
    this.contentImageUrl = contentImageUrl; 
  } 
 
  public Integer getType() { 
    return type; 
  } 
 
  public void setType(Integer type) { 
    this.type = type; 
  } 
 
  public String getLinkUrl() { 
    return linkUrl; 
  } 
 
  public void setLinkUrl(String linkUrl) { 
    this.linkUrl = linkUrl; 
  } 
 
  public String getPicSearchContent() { 
    return picSearchContent; 
  } 
 
  public void setPicSearchContent(String picSearchContent) { 
    this.picSearchContent = picSearchContent; 
  } 
 
  public Integer getShowIndex() { 
    return showIndex; 
  } 
 
  public void setShowIndex(Integer showIndex) { 
    this.showIndex = showIndex; 
  } 
 
  public Boolean getDisable() { 
    return isDisable; 
  } 
 
  public void setDisable(Boolean disable) { 
    isDisable = disable; 
  } 
 
  @Override 
  public boolean equals(Object o) { 
    if (this == o) return true; 
    if (o == null || getClass() != o.getClass()) return false; 
 
    FloorContent that = (FloorContent) o; 
 
    return id != null ? id.equals(that.id) : that.id == null; 
 
  } 
 
  @Override 
  public int hashCode() { 
    return id != null ? id.hashCode() : 0; 
  } 
} 

package cms.model.repository; 
import cms.model.Floor; 
import cms.model.FloorContent; 
import org.springframework.data.domain.Page; 
import org.springframework.data.domain.Pageable; 
import org.springframework.data.jpa.repository.JpaRepository; 
/** 
 * Created by Roney on 2016/10/10. 
 * Created by Roney on 2016/10/10. 
 * 楼层内容管理dao类 
 */ 
public interface FloorContentRepos extends JpaRepository<FloorContent,String>{ 
  public Page<FloorContent> findByFloor_IdAndIsDeleteOrderByShowIndexAsc(String floorId,boolean b, Pageable pageable); 
}