Lucene 布尔查询
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09-09-2019 - |
题
如何在 Lucene 搜索中将 booleanQuery 与 StandardAnalyzer 结合使用?
解决方案
我想你指的是使用的QueryParser对象,正确解析布尔查询?该 Lucene的查询语法文档应该有你需要的一切。
其他提示
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。看 BooleanQuery.Builder.add(org.apache.lucene.search.BooleanClause)
代码示例可以通过以下方式找到 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;
}
}
BooleanQuery. BooleanQuery
是布尔子句的容器,其是可选的,必需的或禁止的子查询。可以正常添加子句BooleanQuery
利用看起来像一个API的方法:
公共无效加载(查询的查询,需要布尔值,布尔禁止的)
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