Google App Engine的JDO：逃脱报价

Question

如何逃避JDO（Google App Engine）中查询的参数？

例如，如果变量名称可能包含不安全的字样（'），我该如何使下一个摘要安全

PersistenceManager pm = ...;
String query = "select from Person where name='"+name+"'";
List<Shortened> shortened = (List<Shortened>) pm.newQuery(query).execute();

Answer 1

相反，使用查询参数，比在查询本身中包含值要安全得多。这是GAE文档中的一个示例：

Query query = pm.newQuery("select from Employee " +
                          "where lastName == lastNameParam " +
                          "order by hireDate desc " +
                          "parameters String lastNameParam");

List<Employee> results = (List<Employee>) query.execute("Smith");