Lucene 布尔查询

Question

如何在 Lucene 搜索中将 booleanQuery 与 StandardAnalyzer 结合使用？

Answer 1

我想您指的是使用 QueryParser 对象解析布尔查询，对吗？ Lucene 查询语法文档 应该包含您需要的一切。

Answer 2

根据文档，布尔查询应该由 BooleanQuery.QueryBuilder 创建一次，然后被认为是不可变的。 请参阅 BooleanQuery.Builder.add(org.apache.lucene.search.BooleanClause)

代码示例可以通过 http://programtalk.com/java-api-usage-examples/org.apache.lucene.util.QueryBuilder/
给出的一个例子是：

public Query parse(Type type, String fieldName, Object value) throws IOException {
    final String field;
    MappedFieldType fieldType = context.fieldMapper(fieldName);
    if (fieldType != null) {
        field = fieldType.name();
    } else {
        field = fieldName;
    }
    /*
     * If the user forced an analyzer we really don't care if they are
     * searching a type that wants term queries to be used with query string
     * because the QueryBuilder will take care of it. If they haven't forced
     * an analyzer then types like NumberFieldType that want terms with
     * query string will blow up because their analyzer isn't capable of
     * passing through QueryBuilder.
     */
    boolean noForcedAnalyzer = this.analyzer == null;
    if (fieldType != null && fieldType.tokenized() == false && noForcedAnalyzer) {
        return blendTermQuery(new Term(fieldName, value.toString()), fieldType);
    }
    Analyzer analyzer = getAnalyzer(fieldType);
    assert analyzer != null;
    MatchQueryBuilder builder = new MatchQueryBuilder(analyzer, fieldType);
    builder.setEnablePositionIncrements(this.enablePositionIncrements);
    Query query = null;
    switch(type) {
        case BOOLEAN:
            if (commonTermsCutoff == null) {
                query = builder.createBooleanQuery(field, value.toString(), occur);
            } else {
                query = builder.createCommonTermsQuery(field, value.toString(), occur, occur, commonTermsCutoff, fieldType);
            }
            break;
        case PHRASE:
            query = builder.createPhraseQuery(field, value.toString(), phraseSlop);
            break;
        case PHRASE_PREFIX:
            query = builder.createPhrasePrefixQuery(field, value.toString(), phraseSlop, maxExpansions);
            break;
        default:
            throw new IllegalStateException("No type found for [" + type + "]");
    }
    if (query == null) {
        return zeroTermsQuery();
    } else {
        return query;
    }
}

Answer 3

布尔查询。 BooleanQuery 是布尔子句的容器，它们是可选的、必需的或禁止的子查询。 通常，您可以使用如下所示的 API 方法向 BooleanQuery 添加一个子句：

public void add(Query query, boolean required, booleanbanned)