[英]QueryDSL multiparameter search, while building the query skip predicate when value is null
I'm working on a Spring Boot web application with QueryDSL JPA. 我正在使用QueryDSL JPA开发Spring Boot Web应用程序。 I have a REST api where i get form input from users.
我有一个REST api,我从用户那里获得表单输入。 I have to perform a multi parameter search.
我必须执行多参数搜索。 If a value of the users inpu is null (which is ok, cause not all fields are requiered), my query builder should skip this value while querying the database.
如果用户inpu的值为null(可以,因为并非所有字段都被取消),我的查询构建器应该在查询数据库时跳过此值。
On my QueryDSL part, i get an Object, for example "Solution", it may look like this: 在我的QueryDSL部分,我得到一个Object,例如“Solution”,它可能如下所示:
ticketNumber: 4261 (Integer) ticketNumber:4261(整数)
errorFlag: false (Boolean) errorFlag:false(布尔值)
statusOCIA: null (string) statusOCIA:null(字符串)
description: "Erorr while clicking an image" (String) description:“单击图像时出现错误”(String)
I tried to build a query dynamically with PathBuilder and BooleanBuilder from QueryDSL: 我尝试使用来自QueryDSL的PathBuilder和BooleanBuilder动态构建查询:
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;
}
I want that it will work like this: If attr.getName is "description", it should perform searchSolution.getDescription. 我想它会像这样工作:如果attr.getName是“description”,它应该执行searchSolution.getDescription。
I tried some stuff with a HashMap or ArrayList but failed due to the different data types in my Object. 我尝试了一些HashMap或ArrayList的东西,但由于我的Object中的数据类型不同而失败了。
I hope someone can help me. 我希望有一个人可以帮助我。
Try to put this check in the if condition 尝试将此检查置于if条件中
entityPath.get(attr.getName()) != null
to make it 做到这一点
if (entityPath.get(attr.getName()) != null) {
builder.or(QentityPath.get(attr.getName()).eq(entityPath.get(attr.getName())));
}
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