JPA条件，将枚举类型转换为字符串

Question

i got some problem. I created entity:

@Entity 
public class Trace extends AbstractEntity {

@Column(name = "trace_level")
@Enumerated(EnumType.STRING)
private TraceLevel traceLevel;

...
}

And jpa criteria:

List<String> tempList = new ArrayList<>();
tempList.add("Warning");
Path path = root.get("traceLevel");
Predicate inP = path.in(tempList);

Of course i got problem

Parameter value [Warning] did not match expected type [com.getknowledge.platform.modules.trace.trace.level.TraceLevel (n/a)]

Since the data for the filter come from the client, and are processed at the basic level, the transformation in string to enum i can not do. The question is, can i build query using strings.

Answer 1

Every enum has a function valueOf that takes a String and returns the appropriate constant. So instead of

List<String> tempList = new ArrayList<>();
tempList.add("Warning");

use

List<TraceLevel> tempList=new ArrayList<>();
tempList.add(TraceLevel.valueOf("Warning"));