Use Hibernate framework to operate pojo instance, bye bye SQL strings :)

src/main/java/love/sola/netsupport/enums/ISPConverter.java

@@ -0,0 +1,25 @@
+package love.sola.netsupport.enums;
+
+import javax.persistence.AttributeConverter;
+import javax.persistence.Converter;
+
+@Converter
+public class ISPConverter implements AttributeConverter<ISP, Integer> {
+
+	@Override
+	public Integer convertToDatabaseColumn(ISP attribute) {
+		if (attribute == null) {
+			return null;
+		}
+		return attribute.id;
+	}
+
+	@Override
+	public ISP convertToEntityAttribute(Integer dbData) {
+		if (dbData == null) {
+			return null;
+		}
+		return ISP.fromId(dbData);
+	}
+
+}