Question

我正在尝试使用带有查询的命名JDBC模板运行类似的匹配...

SELECT
    id, guid, body, summary, status_id, language_id, is_mce, content_type_id, 
    last_edited_by, locked_by, owner_id, coordinator_id, writer_id, paperless, 
    content_body_type, created, updated, locked_timestamp
FROM dbo.content
WHERE notes LIKE :notes

:notes绑定到%test%，遗憾的是它没有返回任何结果。我检查了数据库并验证了这些数据是否存在。这不是执行类似匹配的正确方法吗？

更新

生成此查询的部分代码...

    String notes = search.getNotes();
    if (notes instanceof String && notes.length() > 0) {
        if (!previousClause) {
            searchQuery.append("WHERE ");
            previousClause = true;
        }
        searchQuery.append("notes LIKE :notes AND ");
        queryMap.put("notes", "%"+notes+"%");
    }

    Collection<Category> categories = search.getCategoryCollection();
    if (categories != null && categories.size() > 0) {
        Short x = 0;
        for (Category category : categories) {
            searchQuery.append("INNER JOIN dbo.content_to_category AS content_to_category"+x.toString()+" ON (content_to_category"+x.toString()+".category_id IN (:categoryId"+x.toString()+") AND content_to_category"+x.toString()+".content_id = content.id) ");
            queryMap.put("categoryId"+x.toString(), category.getId());
            x++;
        }
    }

Answer 1

我假设：（1）你从一个合理的版本中使用Hibernate; （2）上述选定字段是content字段的子集。

应该是这样的：

Criteria crit = session.createCriteria(Content.class);

// add all selected fields:
ProjectionList projList = Projections.projectionList();
projList.add(Projections.property("id"));
projList.add(Projections.property("guid"));
projList.add(Projections.property("body"));
projList.add(Projections.property("summary"));
projList.add(Projections.property("status_id"));
projList.add(Projections.property("language_id"));
projList.add(Projections.property("is_mce"));
projList.add(Projections.property("content_type_id"));
projList.add(Projections.property("last_edited_by"));
projList.add(Projections.property("locked_by"));
projList.add(Projections.property("owner_id"));
projList.add(Projections.property("coordinator_id"));
projList.add(Projections.property("writer_id"));
projList.add(Projections.property("coordinator_id"));
projList.add(Projections.property("paperless"));
projList.add(Projections.property("content_body_type"));
projList.add(Projections.property("created"));
projList.add(Projections.property("updated"));
projList.add(Projections.property("locked_timestamp"));
crit.setProjection(projList);

// add a Restriction on notes field, using like:
crit.add(Restrictions.like("notes", "test", MatchMode.ANYWHERE));

// invoke query:
List list = crit.list();

<强>更新

可以肯定的是，你应该使用的正确语法是（依靠直觉和几个博客;我无法确定文档摘录）：

Query query = // create long complicated query that ends with "WHERE notes LIKE :notes"
query.setParameter("notes", "%test%");

这可能不适用于你的情况，因为like运算符适用于varchar个操作数等......而且似乎来自这段代码：

if (notes instanceof String && notes.length() > 0) {

你并不完全确定该字段的基础类型......可能notes不是String吗？

MsSQL命名为JDBC模板LIKE匹配

1 个答案: