系列汇总：
Query有很多子类，完成不同类型的查询任务：
Instantiable subclasses are:
TermQueryMultiTermQueryBooleanQueryWildcardQueryPhraseQueryPrefixQueryMultiPhraseQueryFuzzyQueryTermRangeQueryNumericRangeQuerySpanQuery
不过使用我们系统的用户可并不乐意去了解这些看上去复杂的东西。
那么我们希望有一个工具——他能够理解用户的搜索意图，然后转换成lucene中合理的Query子类，提供给lucene进行检索，
甚至用户可以了解一些标准的检索语法（使用起来相对简单）进行高级搜索。
很好......
这就是lucene提供的QueryParser，他就能够理解用户，通过一系列复杂的过程构建一个合理的Query类型给Searcher进行搜索。
QueryParser是用javaCC生成的一个语法解析工具（应该也算是一种编译器）。
他最常用的方法当然是对“检索式”的解析了
Query |
parse(String query) Parses a query string, returning a Query. |
---------------------------------------------------------------
要想进行一些高级的搜索行为，我们必须了解QueryParser的语法规则。
这里直接贴出“官方给出的语法规则”
Apache Lucene - Query Parser Syntax
- Overview
- Terms
- Fields
- Term Modifiers
- Wildcard Searches
- Fuzzy Searches
- Proximity Searches
- Range Searches
- Boosting a Term
- Boolean Operators
- AND
- +
- NOT
- -
- Grouping
- Field Grouping
- Escaping Special Characters
Overview
Although Lucene provides the ability to create your own queries through its API, it also provides a rich query language through the Query Parser, a lexer which interprets a string into a Lucene Query using JavaCC.
Generally, the query parser syntax may change from release to release. This page describes the syntax as of the current release. If you are using a different version of Lucene, please consult the copy of docs/queryparsersyntax.html that was distributed with the version you are using.
Before choosing to use the provided Query Parser, please consider the following:
- If you are programmatically generating a query string and then parsing it with the query parser then you should seriously consider building your queries directly with the query API. In other words, the query parser is designed for human-entered text, not for program-generated text.
- Untokenized fields are best added directly to queries, and not through the query parser. If a field's values are generated programmatically by the application, then so should query clauses for this field. An analyzer, which the query parser uses, is designed to convert human-entered text to terms. Program-generated values, like dates, keywords, etc., should be consistently program-generated.
- In a query form, fields which are general text should use the query parser. All others, such as date ranges, keywords, etc. are better added directly through the query API. A field with a limit set of values, that can be specified with a pull-down menu should not be added to a query string which is subsequently parsed, but rather added as a TermQuery clause.
Terms
A query is broken up into terms and operators. There are two types of terms: Single Terms and Phrases.
A Single Term is a single word such as "test" or "hello".
A Phrase is a group of words surrounded by double quotes such as "hello dolly".
Multiple terms can be combined together with Boolean operators to form a more complex query (see below).
Note: The analyzer used to create the index will be used on the terms and phrases in the query string. So it is important to choose an analyzer that will not interfere with the terms used in the query string.
Fields
Lucene supports fielded data. When performing a search you can either specify a field, or use the default field. The field names and default field is implementation specific.
You can search any field by typing the field name followed by a colon ":" and then the term you are looking for.
As an example, let's assume a Lucene index contains two fields, title and text and text is the default field. If you want to find the document entitled "The Right Way" which contains the text "don't go this way", you can enter:
title:"The Right Way" AND text:go
or
title:"Do it right" AND right
Since text is the default field, the field indicator is not required.
Note: The field is only valid for the term that it directly precedes, so the query
title:Do it right
Will only find "Do" in the title field. It will find "it" and "right" in the default field (in this case the text field).
Term Modifiers
Lucene supports modifying query terms to provide a wide range of searching options.
Wildcard Searches
Lucene supports single and multiple character wildcard searches within single terms (not within phrase queries).
To perform a single character wildcard search use the "?" symbol.
To perform a multiple character wildcard search use the "*" symbol.
The single character wildcard search looks for terms that match that with the single character replaced. For example, to search for "text" or "test" you can use the search:
te?t
Multiple character wildcard searches looks for 0 or more characters. For example, to search for test, tests or tester, you can use the search:
test*
You can also use the wildcard searches in the middle of a term.
te*t
Note: You cannot use a * or ? symbol as the first character of a search.
Fuzzy Searches
Lucene supports fuzzy searches based on the Levenshtein Distance, or Edit Distance algorithm. To do a fuzzy search use the tilde, "~", symbol at the end of a Single word Term. For example to search for a term similar in spelling to "roam" use the fuzzy search:
roam~
This search will find terms like foam and roams.
Starting with Lucene 1.9 an additional (optional) parameter can specify the required similarity. The value is between 0 and 1, with a value closer to 1 only terms with a higher similarity will be matched. For example:
roam~0.8
The default that is used if the parameter is not given is 0.5.
Proximity Searches
Lucene supports finding words are a within a specific distance away. To do a proximity search use the tilde, "~", symbol at the end of a Phrase. For example to search for a "apache" and "jakarta" within 10 words of each other in a document use the search:
"jakarta apache"~10
Range Searches
Range Queries allow one to match documents whose field(s) values are between the lower and upper bound specified by the Range Query. Range Queries can be inclusive or exclusive of the upper and lower bounds. Sorting is done lexicographically.
mod_date:[20020101 TO 20030101]
This will find documents whose mod_date fields have values between 20020101 and 20030101, inclusive. Note that Range Queries are not reserved for date fields. You could also use range queries with non-date fields:
title:{Aida TO Carmen}
This will find all documents whose titles are between Aida and Carmen, but not including Aida and Carmen.
Inclusive range queries are denoted by square brackets. Exclusive range queries are denoted by curly brackets.
Boosting a Term
Lucene provides the relevance level of matching documents based on the terms found. To boost a term use the caret, "^", symbol with a boost factor (a number) at the end of the term you are searching. The higher the boost factor, the more relevant the term will be.
Boosting allows you to control the relevance of a document by boosting its term. For example, if you are searching for
jakarta apache
and you want the term "jakarta" to be more relevant boost it using the ^ symbol along with the boost factor next to the term. You would type:
jakarta^4 apache
This will make documents with the term jakarta appear more relevant. You can also boost Phrase Terms as in the example:
"jakarta apache"^4 "Apache Lucene"
By default, the boost factor is 1. Although the boost factor must be positive, it can be less than 1 (e.g. 0.2)
Boolean Operators
Boolean operators allow terms to be combined through logic operators. Lucene supports AND, "+", OR, NOT and "-" as Boolean operators(Note: Boolean operators must be ALL CAPS).
The OR operator is the default conjunction operator. This means that if there is no Boolean operator between two terms, the OR operator is used. The OR operator links two terms and finds a matching document if either of the terms exist in a document. This is equivalent to a union using sets. The symbol || can be used in place of the word OR.
To search for documents that contain either "jakarta apache" or just "jakarta" use the query:
"jakarta apache" jakarta
or
"jakarta apache" OR jakarta
AND
The AND operator matches documents where both terms exist anywhere in the text of a single document. This is equivalent to an intersection using sets. The symbol && can be used in place of the word AND.
To search for documents that contain "jakarta apache" and "Apache Lucene" use the query:
"jakarta apache" AND "Apache Lucene"
+
The "+" or required operator requires that the term after the "+" symbol exist somewhere in a the field of a single document.
To search for documents that must contain "jakarta" and may contain "lucene" use the query:
+jakarta lucene
NOT
The NOT operator excludes documents that contain the term after NOT. This is equivalent to a difference using sets. The symbol ! can be used in place of the word NOT.
To search for documents that contain "jakarta apache" but not "Apache Lucene" use the query:
"jakarta apache" NOT "Apache Lucene"
Note: The NOT operator cannot be used with just one term. For example, the following search will return no results:
NOT "jakarta apache"
-
The "-" or prohibit operator excludes documents that contain the term after the "-" symbol.
To search for documents that contain "jakarta apache" but not "Apache Lucene" use the query:
"jakarta apache" -"Apache Lucene"
Grouping
Lucene supports using parentheses to group clauses to form sub queries. This can be very useful if you want to control the boolean logic for a query.
To search for either "jakarta" or "apache" and "website" use the query:
(jakarta OR apache) AND website
This eliminates any confusion and makes sure you that website must exist and either term jakarta or apache may exist.
Field Grouping
Lucene supports using parentheses to group multiple clauses to a single field.
To search for a title that contains both the word "return" and the phrase "pink panther" use the query:
title:(+return +"pink panther")
Escaping Special Characters
Lucene supports escaping special characters that are part of the query syntax. The current list special characters are
+ - && || ! ( ) { } [ ] ^ " ~ * ? : \
To escape these character use the \ before the character. For example to search for (1+1):2 use the query:
\(1\+1\)\:2
在网上应该可以找到翻译版~
注意事项：
1.修改QueryParser的默认布尔逻辑。
void |
setDefaultOperator(QueryParser.Operator op) Sets the boolean operator of the QueryParser. |
| Enum Constant Summary | |
|---|---|
AND |
|
OR |
|
2.关于对日期型的字段进行搜索。
虽然一些资料上强调使用DateTools，但是我在项目中采取了另外一种方式：
进入索引的日期字段统一成：yyyyMMdd 字符串形式
检索的时候也采取同样的表现形式，不管是单独对其进行检索，还是跨度进行检索，都没有发生异常。
（正因为我在项目中采取了字符串表示日期的方法，一直没有去过多了解DateTools的用意，望有使用经验的朋友指点！）
