SpringDataJpa创建联合索引的实现

目录

• SpringDataJpa创建联合索引
• 创建联合索引对应类
• 创建映射实体类
• 添加新数据
• SpringDataJpa指定联合索引
• 在@Table中指定UniqueConstraint
• 自动加上唯一索引了

SpringDataJpa创建联合索引

创建联合索引对应类

/**
 * 作者：guoyzh
 * 时间：2019/12/30 14:58
 * 功能：戴镜视力复查联合主键
 */
@Data
@Embeddable
public class VisualReexaminationUnionKey implements Serializable {
    @Column(name = "id")
    private String id;
    @Column(name = "c_review_date")
    private java.sql.Timestamp cReviewDate;
}

创建映射实体类

@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;*/
    // 复合主键
    @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;
}

添加新数据

@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();
    // 生成联合索引
    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指定联合索引

如何，现在我的表里使用订单ID和产品ID作为唯一索引，那么需要在定义表实体类时

在@Table中指定UniqueConstraint

import lombok.AllArgsConstructor;
import lombok.Getter;
import lombok.NoArgsConstructor;
import lombok.Setter;
import javax.persistence.*;
/**
 * 产品表
 *
 * @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;
    // 订单Id
    @Column(nullable = false, length = 32)
    private String orderId;
    // 受理产品编码
    @Column(length = 32)
    private String productId;
    // 产品名称
    @Column(length = 32)
    private String productName;
    // 时间戳
    @Column(length = 13)
    private Long timestamp;
}

把原来的t_product表drop掉，重启spring boot，再看该表

自动加上唯一索引了

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)

以上为个人经验，希望能给大家一个参考，也希望大家多多支持我们。