我有一个实体类
@Entity
@Table(name = "P_PERSON")
@Cache(usage = CacheConcurrencyStrategy.NONSTRICT_READ_WRITE)
@Document(indexName="p_person")
public class P_person implements Serializable {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private Long id;
@Size(max = 255)
@Column(name = "first_name", length = 255)
private String firstName;
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getFirst_name() {
return firstName;
}
public void setFirst_name(String first_name) {
this.firstName = first_name;
}
@Override
public boolean equals(Object o) {
if (this == o) {
return true;
}
if (o == null || getClass() != o.getClass()) {
return false;
}
P_person p_person = (P_person) o;
if ( ! Objects.equals(id, p_person.id)) return false;
return true;
}
@Override
public int hashCode() {
return Objects.hashCode(id);
}
@Override
public String toString() {
return "P_person{" +
"id=" + id +
", first_name='" + firstName + "'" +
'}';
}
}
和元模型
@Generated(value = "org.hibernate.jpamodelgen.JPAMetaModelEntityProcessor")
@StaticMetamodel(P_person.class)
public abstract class P_person_ {
public static volatile SingularAttribute<P_person, Long> id;
public static volatile SingularAttribute<P_person, String> firstName;
}
存储库类
public interface P_personRepository extends JpaRepository<P_person,Long>, JpaSpecificationExecutor<P_person> {
}
和休息api功能
@RequestMapping(value = "/person_query",
method = RequestMethod.GET)
@RolesAllowed(AuthoritiesConstants.USER)
@Timed
public ResponseEntity<List<P_person>> person_query(@RequestParam(value = "name") String name) throws URISyntaxException {
Pageable pageable = PaginationUtil.generatePageRequest(offset, limit, direction, property);
Page<P_person> page = p_personRepository.findAll(CustomSpecification.whereP_person_query(name), pageable);
HttpHeaders headers = PaginationUtil.generatePaginationHttpHeaders(page, "/api/person_query", offset, limit);
return new ResponseEntity<>(page.getContent(), headers, HttpStatus.OK);
}
CustomSpecification中的我有生成规范的函数
public static Specification<P_person> whereP_person_query(String name) {
return new Specification<P_person>() {
@Override
public Predicate toPredicate(Root<P_person> root, CriteriaQuery<?> criteriaQuery, CriteriaBuilder criteriaBuilder) {
return criteriaBuilder.like(root.get(P_person_.firstName), "%" + name + "%");
}
};
}
当我在MS-SQL
中改变使用包含函数时,我的问题就开始了来自
select * from P_PERSON where first_name like N'%John%'
到
select * from P_PERSON where CONTAINS(first_name, N'John')
我尝试了几种方法,但它仍然失败
第一
public static Specification<P_person> whereP_person_query(String name) {
return new Specification<P_person>() {
@Override
public Predicate toPredicate(Root<P_person> root, CriteriaQuery<?> criteriaQuery, CriteriaBuilder criteriaBuilder) {
Expression<Boolean> contains = criteriaBuilder.function("CONTAINS", Boolean.class, root.get(P_person_.firstName), criteriaBuilder.literal(name));
return criteriaBuilder.isTrue(contains);
}
};
}
这个生成sql:
select count(p_person0_.id) as col_0_0_ from P_PERSON p_person0_ where CONTAINS(p_person0_.first_name, ?)=1
数据库响应错误,“=”附近的语法不正确。
第二
public static Specification<P_person> whereP_person_query(String name) {
return new Specification<P_person>() {
@Override
public Predicate toPredicate(Root<P_person> root, CriteriaQuery<?> criteriaQuery, CriteriaBuilder criteriaBuilder) {
Expression<Boolean> contains = criteriaBuilder.function("CONTAINS", Boolean.class, root.get(P_person_.firstName), criteriaBuilder.literal(name));
return criteriaQuery.where(contains).getRestriction();
}
};
}
这一个返回antlr.NoViableAltException:意外的AST节点:function(CONTAINS) 生成sql:
select generatedAlias0 from com.amlo.aers.domain.P_person as generatedAlias0
where function('CONTAINS', generatedAlias0.firstName, :param0) order by generatedAlias0.id asc
第三 我将返回类更改为Integer并希望它可以工作。
public static Specification<P_person> whereP_person_query(String name) {
return new Specification<P_person>() {
@Override
public Predicate toPredicate(Root<P_person> root, CriteriaQuery<?> criteriaQuery, CriteriaBuilder criteriaBuilder) {
Expression<Integer> contains = criteriaBuilder.function("CONTAINS", Integer.class, root.get(P_person_.firstName), criteriaBuilder.literal(name));
return criteriaBuilder.greaterThan(contains, 0);
}
};
}
它生成sql:
select count(p_person0_.id) as col_0_0_ from P_PERSON p_person0_ where CONTAINS(p_person0_.first_name, ?)>0
返回错误org.hibernate.engine.jdbc.spi.SqlExceptionHelper - '&gt;'附近的语法不正确。
第四
public static Specification<P_person> whereP_person_query(String name) {
return new Specification<P_person>() {
@Override
public Predicate toPredicate(Root<P_person> root, CriteriaQuery<?> criteriaQuery, CriteriaBuilder criteriaBuilder) {
Predicate contains = (Predicate) criteriaBuilder.function("CONTAINS", Boolean.class, root.get(P_person_.firstName), criteriaBuilder.literal(name));
return contains;
}
};
}
仍然是错误 java.lang.ClassCastException:org.hibernate.jpa.criteria.expression.function.ParameterizedFunctionExpression无法强制转换为javax.persistence.criteria.Predicate
第五
public static Specification<P_person> whereP_person_query(String name) {
return new Specification<P_person>() {
@Override
public Predicate toPredicate(Root<P_person> root, CriteriaQuery<?> criteriaQuery, CriteriaBuilder criteriaBuilder) {
Expression<Boolean> contains = criteriaBuilder.function("CONTAINS", Boolean.class, root.get(P_person_.firstName), criteriaBuilder.literal(name));
return criteriaBuilder.not(criteriaBuilder.not(contains));
}
};
}
仍然返回antlr.NoViableAltException:意外的AST节点:function(CONTAINS)
第六 读完我找到的所有资源后。
public static Specification<P_person> whereP_person_query(String name) {
return new Specification<P_person>() {
@Override
public Predicate toPredicate(Root<P_person> root, CriteriaQuery<?> criteriaQuery, CriteriaBuilder criteriaBuilder) {
Expression<Boolean> contains = criteriaBuilder.function("CONTAINS", Boolean.class, root.get(P_person_.firstName), criteriaBuilder.literal(name));
criteriaQuery.where(contains);
return null;
}
};
}
仍然返回antlr.NoViableAltException:意外的AST节点:function(CONTAINS)
“whereP_person_query”可以轻松替换为本机查询。 但我的问题是有一些规范结合了许多标准。 所以我创建了“whereP_person_query”来证明在这个项目中使用全文搜索。
真的可以这样做吗?
提前致谢。
答案 0 :(得分:1)
从这个问题https://hibernate.atlassian.net/browse/HHH-3992开始 我尝试应用它和这段代码。
public static Specification<P_person> whereP_person_query(String name) {
return new Specification<P_person>() {
@Override
public Predicate toPredicate(Root<P_person> root, CriteriaQuery<?> criteriaQuery, CriteriaBuilder criteriaBuilder) {
return criteriaBuilder.and(criteriaBuilder.and(), criteriaBuilder.function("CONTAINS", Boolean.class, root.get(P_person_.firstName), criteriaBuilder.literal(name)));
}
};
}
但最终由于在一个SQL中执行多包含功能,我无法使用它。
所以我编写了另一个使用containsstable创建sql的类。
答案 1 :(得分:0)
您的第一个解决方案可行,但您应该删除调用criteriaBuilder.isTrue(contains)
- 它会将对比与true添加到SQL中,因此在生成的SQL查询结束时得到= 1.
解决方案是将toPredicate
方法的返回类型从谓词更改为表达式:
@Override
public Expression toPredicate(Root<P_person> root, CriteriaQuery<?> criteriaQuery, CriteriaBuilder criteriaBuilder) {
Expression<Boolean> contains = criteriaBuilder.function("CONTAINS", Boolean.class, root.get(P_person_.firstName), criteriaBuilder.literal(name));
return contains; // return
}
或者,如果你绝对必须返回谓词(不能选择修改界面),你应该将表达式转换为谓词而不添加副作用 - 使用criteriaBuilder.add
方法而不是{{ 1}}应该没问题:
isTrue