[英]Create Dynamic JPA Query
I have a view with many fields as query filters, and I am using JPA derived queries, however creating all queries for every combination of fields/filters would be tedious and long.我有一个包含许多字段作为查询过滤器的视图,并且我正在使用 JPA 派生查询,但是为每个字段/过滤器组合创建所有查询将是乏味且冗长的。
I found out that I can create a dynamic query for it, but not sure how.我发现我可以为它创建一个动态查询,但不确定如何。
So far I have created these queries in my repository, but still need a lot more:到目前为止,我已经在我的存储库中创建了这些查询,但还需要更多:
public interface EmployeeReportInfoViewRepository extends PagingAndSortingRepository<EmployeeReportInfo, Long> {
List<EmployeeReportInfo> findByControlNumber(String controlNmber);
List<EmployeeReportInfo> findByManager(String manager);
List<EmployeeReportInfo> findByofficeLocation(String officeLocation);
List<EmployeeReportInfo> findByBenchFlag(char benchFlag);
List<EmployeeReportInfo> findByBillableFlag(char billableFlag);
List<EmployeeReportInfo> findByEnableFlag(boolean enableFlag);
List<EmployeeReportInfo> findByLastNameAndFirstNameAndControlNumber(String lastName, String firstName,String controlNumber);
List<EmployeeReportInfo> findByLastNameAndFirstNameAndControlNumberAndManager(String lastName, String firstName,String controlNmber,String manager);
List<EmployeeReportInfo> findByLastNameAndFirstNameAndControlNumberAndManagerAndOfficeLocation(String lastName, String firstName,String controlNmber,String manager,String officeLocation);
List<EmployeeReportInfo> findByLastNameAndFirstNameAndControlNumberAndManagerAndOfficeLocationAndBenchFlag(String lastName, String firstName,String controlNmber,String manager,String officeLocation, char benchFlag);
List<EmployeeReportInfo> findByLastNameAndFirstNameAndControlNumberAndManagerAndOfficeLocationAndBenchFlagAndBillableFlag(String lastName, String firstName,String controlNmber,String manager,String officeLocation, char benchFlag,char bllableFlag);
List<EmployeeReportInfo> findByLastNameAndFirstNameAndControlNumberAndManagerAndOfficeLocationAndBenchFlagAndBillableFlagAndEnableFlagAndStartGreaterThanEqualAndEndLessThanEqual
(String lastName, String firstName,String controlNmber,String manager,String officeLocation, char benchFlag,char bllableFlag,
boolean emableFlag, Date start,Date end);
}
@Entity
@Table(name = "employee_report_view")
public class EmployeeReportInfo {
@Id
@Column(name = "employee_id")
private Long id;
private String name;
private Date start;
private Date end;
@Column(name = "control_number")
private String controlNumber;
@Column(name = "enable_flag")
private boolean enableFlag;
@Column(name = "billable_flag")
private char billableFlag;
@Column(name = "bench_flag")
private char benchFlag;
@Column(name = "office_location")
private String officeLocation;
@Column(name = "manager")
private String manager;
/**
* @return the id
*/
public Long getId() {
return id;
}
/**
* @return the name
*/
public String getName() {
return name;
}
/**
* @param name the name to set
*/
public void setName(String name) {
this.name = name;
}
/**
* @param id the id to set
*/
public void setId(Long id) {
this.id = id;
}
/**
* @return the start
*/
public Date getStart() {
return start;
}
/**
* @param start the start to set
*/
public void setStart(Date start) {
this.start = start;
}
/**
* @return the end
*/
public Date getEnd() {
return end;
}
/**
* @param end the end to set
*/
public void setEnd(Date end) {
this.end = end;
}
/**
* @return the controlNumber
*/
public String getControlNumber() {
return controlNumber;
}
/**
* @param controlNumber the controlNumber to set
*/
public void setControlNumber(String controlNumber) {
this.controlNumber = controlNumber;
}
/**
* @return the enableFlag
*/
public boolean isEnableFlag() {
return enableFlag;
}
/**
* @param enableFlag the enableFlag to set
*/
public void setEnableFlag(boolean enableFlag) {
this.enableFlag = enableFlag;
}
/**
* @return the billableFlag
*/
public char getBillableFlag() {
return billableFlag;
}
/**
* @param billableFlag the billableFlag to set
*/
public void setBillableFlag(char billableFlag) {
this.billableFlag = billableFlag;
}
/**
* @return the benchFlag
*/
public char getBenchFlag() {
return benchFlag;
}
/**
* @param benchFlag the benchFlag to set
*/
public void setBenchFlag(char benchFlag) {
this.benchFlag = benchFlag;
}
/**
* @return the officeLocation
*/
public String getOfficeLocation() {
return officeLocation;
}
/**
* @param officeLocation the officeLocation to set
*/
public void setOfficeLocation(String officeLocation) {
this.officeLocation = officeLocation;
}
/**
* @return the manager
*/
public String getManager() {
return manager;
}
/**
* @param manager the manager to set
*/
public void setManager(String manager) {
this.manager = manager;
}
}
Do you want to write Native Sql queries instead?您想改为编写本机 Sql 查询吗? You can do through entityManager你可以通过 entityManager
I can understand your needs:you want to dynamically generate query conditions based on the url issued by the form.Let's assume that the url maps to the back end to a HashMap<String,String>
.我可以理解您的需求:您想根据表单发出的 url 动态生成查询条件。假设 url 映射到后端到HashMap<String,String>
。
For instance,url:例如,url:
127.0.0.1/employees?nameContains=jack&ageEquals=10
Map: Map:
HashMap<String, String>:key:nameContains,value:jack,key:ageEuqals,value:10
The Spring framework can do this mapping automatically( RequestParamMapMethodArgumentResolver
). Spring 框架可以自动执行此映射( RequestParamMapMethodArgumentResolver
)。 What you need to do is to dynamically generate the Specification( Specification ) by this map.您需要做的是通过这个 map 动态生成规范( Specification )。
Predicate like(Expression x, String pattern);谓词 like(Expression x, String pattern); => contains => 包含
Predicate equal(Expression x, Expression y);谓词等于(表达式 x,表达式 y); => equal => 相等
This is a relatively complex solution idea, which requires the coordination between the front table component and the back end, but it will be very convenient.这是一个比较复杂的解决思路,需要前表组件和后端的协调,但是会很方便。
What I said is relatively simple and general, there are a lot of details.(such as nested properties,one-to-one,one-to-many,etc)我说的比较简单笼统,细节很多(比如嵌套属性,一对一,一对多等)
Also,You can have a look http://www.querydsl.com/另外,你可以看看http://www.querydsl.com/
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