Java 带有参数和单引号的自定义HQL函数

我正试图在hibernate中编写一个自定义函数来使用ts_vector（postgres），目前为止我的代码是：

public class PostgresSQLFTSFunction implements SQLFunction {

    static final Logger LOG = LogManager.getLogger();

    @Override
    public boolean hasArguments() {
        return true;
    }

    @Override
    public boolean hasParenthesesIfNoArguments() {
        return false;
    }

    @Override
    public Type getReturnType(Type firstArgumentType, Mapping mapping) throws QueryException {
        return new BooleanType();
    }

    @Override
    public String render(Type firstArgumentType, List arguments, SessionFactoryImplementor factory) throws QueryException {
        if (arguments == null || arguments.size() < 2) {
            throw new IllegalArgumentException("The function must have at least 2 arguments");
        }

        String fragment, ftsConfig, field, value;

        if (arguments.size() == 3) {
            ftsConfig = (String) arguments.get(0);
            field = (String) arguments.get(1);
            value  = (String) arguments.get(2);
            fragment = "to_tsvector(" + ftsConfig + ", unaccent(" + field + ")) @@ to_tsquery(" + ftsConfig + ", unaccent(" + value + "))";
        } else {
            field = (String) arguments.get(0);
            value = (String) arguments.get(1);
            fragment = "to_tsvector(unaccent(" + field + ")) @@ " + "to_tsquery('" + value + ":*' )";
        }

        LOG.info(fragment);

        return fragment;
    }
}

Hibernate生成的输出查询是：

select city0_.id as id1_0_, city0_.created_at as created_2_0_, city0_.updated_at as updated_3_0_, city0_.version as version4_0_, city0_.lat as lat5_0_, city0_.lng as lng6_0_, city0_.name as name7_0_, city0_.state_id as state_id8_0_ from cities city0_ where to_tsvector(unaccent(city0_.name)) @@ to_tsquery('?:*' )=true

这里的问题是

to_tsquery（'？：*'）

不会将问号转换为命名参数（cityName），因为它包含在单引号中，但此处的单引号是必需的，否则查询将无法工作

例如，有效的查询是：

select city0_.id as id1_0_, city0_.created_at as created_2_0_, city0_.updated_at as updated_3_0_, city0_.version as version4_0_, city0_.lat as lat5_0_, city0_.lng as lng6_0_, city0_.name as name7_0_, city0_.state_id as state_id8_0_ from cities city0_ where to_tsvector(unaccent(city0_.name)) @@ to_tsquery('vi:*')=true;

因此，在上面的示例中，

cityName

问号应该由HQL翻译为“vi”。 我怎样才能做到这一点

---

谢谢

您是否使用扩展方言中的registerFunction注册了您的函数？我没有，我采用了另一种MetadataBuilderContributor方法。我刚刚用这个片段编辑了这个问题，谢谢！顺便说一句，函数正在被调用，问题是？被解释为文字，而不是变量，因为它在引号中。您是否使用扩展方言中的registerFunction注册了您的函数？我没有，我采用了其他MetadataBuilderContributor方法。我刚刚用这个片段编辑了这个问题，谢谢！顺便说一句，函数正在被调用，问题是？被解释为文字，而不是变量，因为它位于引号内。

select city0_.id as id1_0_, city0_.created_at as created_2_0_, city0_.updated_at as updated_3_0_, city0_.version as version4_0_, city0_.lat as lat5_0_, city0_.lng as lng6_0_, city0_.name as name7_0_, city0_.state_id as state_id8_0_ from cities city0_ where to_tsvector(unaccent(city0_.name)) @@ to_tsquery('?:*' )=true

select city0_.id as id1_0_, city0_.created_at as created_2_0_, city0_.updated_at as updated_3_0_, city0_.version as version4_0_, city0_.lat as lat5_0_, city0_.lng as lng6_0_, city0_.name as name7_0_, city0_.state_id as state_id8_0_ from cities city0_ where to_tsvector(unaccent(city0_.name)) @@ to_tsquery('vi:*')=true;