@Index用法——javax.persistence.Index

package com.springup.utiku.model;

import java.io.Serializable;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Index;
import javax.persistence.Table;

@Entity
@Table(indexes = { 
        @Index(name="studentAnswerQueIdIndex", columnList="studentAnswerQueId DESC"),
        @Index(name="questionConIdIndex", columnList="questionConId") 
        })
public class StudentAnswerConEntity implements Serializable {
    private static final long serialVersionUID = 1L;
    @Id
    @GeneratedValue(strategy=GenerationType.AUTO)
    private Long id;
    private Long studentAnswerQueId;
    private Long questionConId;
    private String selected;// 学员答题记录
    public StudentAnswerConEntity() {}
    public StudentAnswerConEntity(Long studentAnswerQueId, Long questionConId) {
        this.studentAnswerQueId = studentAnswerQueId;
        this.questionConId = questionConId;
    }
    public Long getId() {
        return id;
    }
    public void setId(Long id) {
        this.id = id;
    }
    public Long getQuestionConId() {
        return questionConId;
    }
    public void setQuestionConId(Long questionConId) {
        this.questionConId = questionConId;
    }
    public Long getStudentAnswerQueId() {
        return studentAnswerQueId;
    }
    public void setStudentAnswerQueId(Long studentAnswerQueId) {
        this.studentAnswerQueId = studentAnswerQueId;
    }
    public String getSelected() {
        return selected;
    }
    public void setSelected(String selected) {
        this.selected = selected;
    }
}