本篇内容主要讲解“Spring DataJpa如何创建联合索引”，感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷，实用性强。下面就让小编来带大家学习“Spring DataJpa如何创建联合索引”吧!
SpringDataJpa创建联合索引
创建联合索引对应类
@Data@Embeddablepublic 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@Datapublic class QyVisualReexamination { // 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
@Overridepublic 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.*;@Entity@Table(name = "t_product", uniqueConstraints = @UniqueConstraint(columnNames = {"orderId", "productId"}))@Getter@Setter@AllArgsConstructor@NoArgsConstructorpublic 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)到此，相信大家对“Spring DataJpa如何创建联合索引”有了更深的了解，不妨来实际操作一番吧！这里是编程网网站，更多相关内容可以进入相关频道进行查询，关注我们，继续学习！
