我没有找到使用JPA(EclipseLink)从PostgreSQL映射JSON和JSONB数据类型的方法.有人在JPA中使用这种数据类型吗?能给我一些工作示例吗?
我没有找到使用JPA(EclipseLink)从PostgreSQL映射JSON和JSONB数据类型的方法.有人在JPA中使用这种数据类型吗?能给我一些工作示例吗?
所有的答案都帮助我找到了最终的解决方案,为JPA而不是EclipseLink或Hibernate做好了准备.
import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.ObjectMapper;
import java.io.IOException;
import javax.json.Json;
import javax.json.JsonObject;
import javax.persistence.Converter;
import org.postgresql.util.PGobject;
@Converter(autoApply = true)
public class JsonConverter implements javax.persistence.AttributeConverter<JsonObject, Object> {
private static final long serialVersionUID = 1L;
private static ObjectMapper mapper = new ObjectMapper();
@Override
public Object convertToDatabaseColumn(JsonObject objectValue) {
try {
PGobject out = new PGobject();
out.setType("json");
out.setValue(objectValue.toString());
return out;
} catch (Exception e) {
throw new IllegalArgumentException("Unable to serialize to json field ", e);
}
}
@Override
public JsonObject convertToEntityAttribute(Object dataValue) {
try {
if (dataValue instanceof PGobject && ((PGobject) dataValue).getType().equals("json")) {
return mapper.reader(new TypeReference<JsonObject>() {
}).readValue(((PGobject) dataValue).getValue());
}
return Json.createObjectBuilder().build();
} catch (IOException e) {
throw new IllegalArgumentException("Unable to deserialize to json field ", e);
}
}
}