SpringDataJpa創(chuàng)建聯(lián)合索引的實現(xiàn)

更新時間：2021年12月08日 12:00:15 作者：414丶小哥

這篇文章主要介紹了SpringDataJpa創(chuàng)建聯(lián)合索引的實現(xiàn)，具有很好的參考價值，希望對大家有所幫助。如有錯誤或未考慮完全的地方，望不吝賜教

SpringDataJpa創(chuàng)建聯(lián)合索引

在這里插入圖片描述

創(chuàng)建聯(lián)合索引對應類

/**
 * 作者：guoyzh
 * 時間：2019/12/30 14:58
 * 功能：戴鏡視力復查聯(lián)合主鍵
 */
@Data
@Embeddable
public class VisualReexaminationUnionKey implements Serializable {
    @Column(name = "id")
    private String id;
    @Column(name = "c_review_date")
    private java.sql.Timestamp cReviewDate;
}

創(chuàng)建映射實體類

@Table(name = "qy_visual_reexamination")
@Entity
@Data
public class QyVisualReexamination {
    /*@Id
    @Column(nullable = true, name = "id")
    private String id;
    @Id
    @Column(nullable = true, name = "c_review_date")
    private java.sql.Timestamp cReviewDate;*/
    // 復合主鍵
    @EmbeddedId
    private VisualReexaminationUnionKey id;
    @Column(nullable = true, name = "c_clientid")
    private String cClientid;
    @Column(nullable = true, name = "c_ygscode")
    private String cYgscode;
    @Column(nullable = true, name = "c_primary_vision_r")
    private String cPrimaryVisionR;
    @Column(nullable = true, name = "c_primary_vision_l")
    private String cPrimaryVisionL;
    @Column(nullable = true, name = "c_ball_r")
    private String cBallR;
    @Column(nullable = true, name = "c_ball_l")
    private String cBallL;
    @Column(nullable = true, name = "c_pole_r")
    private String cPoleR;
    @Column(nullable = true, name = "c_pole_l")
    private String cPoleL;
    @Column(nullable = true, name = "c_axes_r")
    private String cAxesR;
    @Column(nullable = true, name = "c_axes_l")
    private String cAxesL;
    @Column(nullable = true, name = "c_add_r")
    private String cAddR;
    @Column(nullable = true, name = "c_add_l")
    private String cAddL;
    @Column(nullable = true, name = "c_check_r")
    private String cCheckR;
    @Column(nullable = true, name = "c_check_l")
    private String cCheckL;
    @Column(nullable = true, name = "c_proposal")
    private String cProposal;
    @Column(nullable = true, name = "c_com")
    private String cCom;
}

添加新數(shù)據(jù)

@Override
public Object addVisualReexamination(String id, String clientId, String reviewDate, String ygsCode, String primaryVisionR,
                                     String primaryVisionL, String ballR, String ballL, String poleR, String poleL, String axesR,
                                     String axesL, String addR, String addL, String checkR, String checkL, String proposal, String comId) {
    QyVisualReexamination bean = new QyVisualReexamination();
    // 生成聯(lián)合索引
    VisualReexaminationUnionKey unionId = new VisualReexaminationUnionKey();
    unionId.setCReviewDate(Timestamp.valueOf(reviewDate));
    unionId.setId(id);
    bean.setId(unionId);
    bean.setCClientid(clientId);
    bean.setCYgscode(ygsCode);
    bean.setCPrimaryVisionR(primaryVisionR);
    bean.setCPrimaryVisionL(primaryVisionL);
    bean.setCBallR(ballR);
    bean.setCBallL(ballL);
    bean.setCPoleR(poleR);
    bean.setCPoleL(poleL);
    bean.setCAxesR(axesR);
    bean.setCAxesL(axesL);
    bean.setCAddR(addR);
    bean.setCAddL(addL);
    bean.setCCom(comId);
    bean.setCCheckR(checkR);
    bean.setCCheckL(checkL);
    bean.setCProposal(proposal);
    QyVisualReexamination save = mQyVisualReexaminationDao.save(bean);
    return save.getId();
}

SpringDataJpa指定聯(lián)合索引

如何，現(xiàn)在我的表里使用訂單ID和產(chǎn)品ID作為唯一索引，那么需要在定義表實體類時

在@Table中指定UniqueConstraint

import lombok.AllArgsConstructor;
import lombok.Getter;
import lombok.NoArgsConstructor;
import lombok.Setter;
import javax.persistence.*;
/**
 * 產(chǎn)品表
 *
 * @author wulinfeng
 * @since 2019/12/13
 */
@Entity
@Table(name = "t_product", uniqueConstraints = @UniqueConstraint(columnNames = {"orderId", "productId"}))
@Getter
@Setter
@AllArgsConstructor
@NoArgsConstructor
public class ProductItem {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;
    // 訂單Id
    @Column(nullable = false, length = 32)
    private String orderId;
    // 受理產(chǎn)品編碼
    @Column(length = 32)
    private String productId;
    // 產(chǎn)品名稱
    @Column(length = 32)
    private String productName;
    // 時間戳
    @Column(length = 13)
    private Long timestamp;
}

把原來的t_product表drop掉，重啟spring boot，再看該表

自動加上唯一索引了

mysql> show index from t_product;
+-----------+------------+-----------------------------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+
| Table     | Non_unique | Key_name                    | Seq_in_index | Column_name | Collation | Cardinality | Sub_part | Packed | Null | Index_type | Comment | Index_comment |
+-----------+------------+-----------------------------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+
| t_product |          0 | PRIMARY                     |            1 | id          | A         |           2 |     NULL | NULL   |      | BTREE      |         |               |
| t_product |          0 | UK1mvw2lcd07t4cuicl4awfbgkw |            1 | order_id    | A         |           2 |     NULL | NULL   |      | BTREE      |         |               |
| t_product |          0 | UK1mvw2lcd07t4cuicl4awfbgkw |            2 | product_id  | A         |           2 |     NULL | NULL   | YES  | BTREE      |         |               |
+-----------+------------+-----------------------------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+
3 rows in set (0.00 sec)

以上為個人經(jīng)驗，希望能給大家一個參考，也希望大家多多支持腳本之家。

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