【发布时间】：2016-07-01 08:40:21
【问题描述】：
我在我的应用程序中使用了 8 种不同的字段过滤器，这些过滤器是从八个不同的下拉列表中选择的，现在我希望根据下拉选择的值获取数据。现在，如果我从下拉列表中选择了一个值，那么它将获取根据所选值的数据，其余字段为空，如果我选择另一个字段，则它将检查两个字段值，其余字段为空，它将从数据库中获取结果。这样做我有进行了一次查询以获取
的数据public List<Companies> getFilteredData(int start,
int length,
String companyName,
String state,
Integer empId,
String country,
String website,
Integer pTech,
Integer sTech,
Integer status){
Criteria cr=factory.getCurrentSession().createCriteria(Companies.class);
cr.createAlias("primTech","primTech");
cr.createAlias("secondTech","secondTech");
cr.createAlias("statuss","statuss");
cr.createAlias("employee","employee");
cr.add(Restrictions.and(
Restrictions.or(
Restrictions.eq("companyName",companyName),
Restrictions.isNotNull("companyName"))
,
Restrictions.or(
Restrictions.eq("state",state),
Restrictions.isNotNull("state")),
Restrictions.or(
Restrictions.eq("employee.id",empId),
Restrictions.isNotNull("employee.id")),
Restrictions.or(
Restrictions.eq("country",country),
Restrictions.isNotNull("country"))
,
Restrictions.or(
Restrictions.eq("website",website),
Restrictions.isNotNull("website"))
,
Restrictions.or(
Restrictions.eq("primTech.id",pTech)
,Restrictions.isNotNull("primTech.id"))
,
Restrictions.or(
Restrictions.eq("secondTech.id",sTech),
Restrictions.isNotNull("secondTech.id"))
,
Restrictions.or(Restrictions.eq("statuss.id",status),
Restrictions.isNotNull("statuss.id"))
));
return cr.list();
}
正如我上面提到的，这个列表在所有这些情况下都返回空值。 这里你是我的 POJO 类，
@Entity
@Table
public class Companies implements Serializable {
@Id
@GeneratedValue
private int id;
private String companyName;
private String website;
private String contactName;
private String jobTitle;
private String address;
private String city;
private String pin;
private String country;
private String empSize;
private String state;
private String businessDomain;
private double rating;
@ManyToOne
@JoinColumn(name = "primTechID")
private PrimaryTech primTech;
@ManyToOne
@JoinColumn(name = "secondTechID")
private SecondaryTech secondTech;
@ManyToOne
@JoinColumn(name = "statusID")
private Status statuss;
private String phoneNo;
private String mobileNo;
private String email;
private Date datee;
private String description;
private String skyp;
@ManyToOne
@JoinColumn(name = "employee_id")
private Employee employee;
@OneToMany(mappedBy="companies",fetch=FetchType.LAZY)
@LazyCollection(LazyCollectionOption.FALSE)
private List<ContactedBy> contactedBy = new ArrayList<ContactedBy>();
这是我的控制器端，
@RequestMapping("admin/getdynamic")
public @ResponseBody
String dataProcessing(@RequestParam int draw,
@RequestParam int start,
@RequestParam int length,
@RequestParam(required=false) Integer tech,
@RequestParam(required=false)Integer sec,
@RequestParam(required=false)Integer emp,
@RequestParam String cont,
@RequestParam String state,
@RequestParam(required=false)Integer status,
@RequestParam String url,
@RequestParam String compName,
Model model){
JsonNodeFactory factory = JsonNodeFactory.instance;
ObjectNode objectNode = factory.objectNode();
List<Companies> list = companyService.getFilteredData(start,length,compName, state, emp, cont, url, tech, sec, status);
ArrayNode node = factory.arrayNode();
objectNode.set("data", node);
list.forEach(lists -> {
ArrayNode arr = factory.arrayNode();
arr.add(lists.getId());
arr.add(lists.getCompanyName());
arr.add(lists.getEmail());
arr.add(lists.getContactName());
arr.add(lists.getWebsite());
arr.add(lists.getPrimTech().getName());
arr.add(lists.getJobTitle());
arr.add(lists.getPhoneNo());
arr.add("<td><input type='checkbox' name='chkbox' id='chekbox' class='chekbox'/></td>");
arr.add("<td width='40'><a class='creativeButton squareBlueButton editButton ct_edit_group' onClick='onUpdateClick("+lists.getId()+")'></a><a class='creativeButton squareRedButton closeButton'onClick='onDeleteClick("+lists.getId()+")'></a></td>");
node.add(arr);
});
objectNode.put("draw", draw);
objectNode.put("recordsTotal", companyService.getFilteredData(start,length,compName, state, emp, cont, url, tech, sec, status).size());
objectNode.put("recordsFiltered", companyService.companyService.getFilteredData(start,length,compName, state, emp, cont, url, tech, sec, status).size());
return objectNode.toString();
}
等待您的尽快答复.. 谢谢..
这里是hibernate触发的查询，注意最后的查询..
/* criteria query */ select this_.id as id1_0_7_, this_.Status_Count as Status_C2_0_7_, this_.address as address3_0_7_, this_.businessDomain as business4_0_7_, this_.city as city5_0_7_, this_.companyName as companyN6_0_7_, this_.contactName as contactN7_0_7_, this_.country as country8_0_7_, this_.datee as datee9_0_7_, this_.description as descrip10_0_7_, this_.email as email11_0_7_, this_.empSize as empSize12_0_7_, this_.employee_id as employe21_0_7_, this_.jobTitle as jobTitl13_0_7_, this_.mobileNo as mobileN14_0_7_, this_.phoneNo as phoneNo15_0_7_, this_.pin as pin16_0_7_, this_.primTechID as primTec22_0_7_, this_.rating as rating17_0_7_, this_.secondTechID as secondT23_0_7_, this_.skyp as skyp18_0_7_, this_.state as state19_0_7_, this_.statusID as statusI24_0_7_, this_.website as website20_0_7_, employee4_.id as id1_2_0_, employee4_.Report_to as Report_t7_2_0_, employee4_.email as email2_2_0_, employee4_.firstName as firstNam3_2_0_, employee4_.lastName as lastName4_2_0_, employee4_.password as password5_2_0_, employee4_.roleID as roleID8_2_0_, employee4_.username as username6_2_0_, employee7_.id as id1_2_1_, employee7_.Report_to as Report_t7_2_1_, employee7_.email as email2_2_1_, employee7_.firstName as firstNam3_2_1_, employee7_.lastName as lastName4_2_1_, employee7_.password as password5_2_1_, employee7_.roleID as roleID8_2_1_, employee7_.username as username6_2_1_, employeero8_.id as id1_3_2_, employeero8_.name as name2_3_2_, primtech1_.id as id1_4_3_, primtech1_.name as name2_4_3_, secondtech2_.id as id1_7_4_, secondtech2_.name as name2_7_4_, statuss3_.id as id1_8_5_, statuss3_.name as name2_8_5_, statuss3_.categoryId as category3_8_5_, statuscate12_.id as id1_9_6_, statuscate12_.categoryName as category2_9_6_ from Companies this_ inner join Employee employee4_ on this_.employee_id=employee4_.id left outer join Employee employee7_ on employee4_.Report_to=employee7_.id left outer join EmployeeRole employeero8_ on employee4_.roleID=employeero8_.id inner join PrimaryTech primtech1_ on this_.primTechID=primtech1_.id inner join SecondaryTech secondtech2_ on this_.secondTechID=secondtech2_.id inner join Status statuss3_ on this_.statusID=statuss3_.id left outer join StatusCategory statuscate12_ on statuss3_.categoryId=statuscate12_.id where ((this_.companyName is not null and this_.companyName=? and (this_.state is not null) and this_.state=? and (employee4_.id is not null) and employee4_.id=? and (this_.country is not null) and this_.country=? and (this_.website is not null) and this_.website=? and (primtech1_.id is not null) and primtech1_.id=? and (secondtech2_.id is not null) and secondtech2_.id=? and (statuss3_.id is not null) and statuss3_.id=?))
【问题讨论】：
-
您在日志中看到生成的查询了吗？热衷于看到这一点
-
你正在执行很多连接.. 这不是一件好事
-
为什么很多join不好？
-
它会增加查询运行的时间，还会导致大量重复行。许多数据库甚至不允许连接超过 5 个表
-
您正在等待答案，但是...您的问题是什么？
标签： java hibernate hibernate-criteria