QueryDSL多参数搜索，当值为null时生成查询跳过谓词

Question

我正在使用QueryDSL JPA开发一个Spring Boot web应用程序。我有一个REST api，从用户那里获得表单输入。我必须执行多参数搜索。如果users inpu的值为null（这是可以的，因为并不是所有字段都被保留），我的查询生成器在查询数据库时应该跳过这个值。

    public List<Solution> findSolutionBySolutionQuerydsl(Solution searchSolution) {


    QSolution solution = QSolution.solution;
    JPAQuery<?> query = new JPAQuery<Void>(em);


    BooleanBuilder builder = new BooleanBuilder();
    PathBuilder<QSolution> QentityPath = new PathBuilder<QSolution>(QSolution.class, "solution");
    PathBuilder<Solution> entityPath = new PathBuilder<Solution>(Solution.class, "serachSolution");

    Field[] fields = searchSolution.getClass().getDeclaredFields();


    for (Field attr : fields) {

        if (searchSolution."here it should perform searchSolution.getTicketNumber or searchSolution.getDiscription depending on what attr.getName is"  != null) {
            builder.or(QentityPath.get(attr.getName()).eq(entityPath.get(attr.getName())));

        }
    }

    List<Solution> s1 = query.select(solution)
            .from(solution)
            .where(builder)
            .fetch();

    System.out.println(("query: " + s1));

    return s1;

}

我希望有人能帮助我。

Answer 1

尝试将此支票置于if条件

entityPath.get(attr.getName()) != null

使之成功

if (entityPath.get(attr.getName()) != null) {

    builder.or(QentityPath.get(attr.getName()).eq(entityPath.get(attr.getName())));
}