sphinx在c#.net平臺下使用（一）
Sphinx是由俄羅斯人Andrew Aksyonoff開發的一個能夠結合MySQL,PostgreSQL全文檢索引擎。意圖爲其餘應用提供高速、低空間佔用、高結果 相關度的全文搜索功能。是作站內全文搜索的一把利器。php
sphinx已經出現不少年，並非一個新鮮技術，但現在仍被普遍使用者。但因爲IT技術的不斷創新，在圈子中又出現了幾款用於全文檢索的新技術，如lucene就是一款與之媲美的工具，但相對而言，它的創建索引的速度卻遠遠不如sphinx。次文不介紹sphinx的如何優越，主要介紹一下我在使用sphinx是的一些心得筆記，勿拍磚，但願給你們一個參考。html
sphinx擁有豐富的學習材料，http://www.sphinxsearch.org/archives/80 這文檔擁有詳細的sphinx安裝步驟。java
本次使用操做系統爲centos6.5,sphinx2.2版本。mysql
Sphinx在mysql上的應用有兩種方式：（下面這一段是摘抄的，勿拍磚）
①、採用API調用，如使用PHP、java等的API函數或方法查詢。優勢是可沒必要對mysql從新編譯，服務端進程「低耦合」，且程序可靈活、方便的調用；
缺點是如已有搜索程序的條件下，需修改部分程序。推薦程序員使用。git
②、使用插件方式（sphinxSE）把sphinx編譯成一個mysql插件並使用特定的sql語句進行檢索。其特色是，在sql端方便組合，且能直接返回數據給客戶端。沒必要二次查詢（注）,在程序上僅須要修改對應的sql，但這對使用框架開發的程序很不方便，好比使用了ORM。另外還須要對mysql進行從新編譯，且須要mysql-5.1以上版本支持插件存儲。程序員
系統管理員可以使用這種方式sphinx在檢索到結果後只能返回記錄的ID，而非要查的sql數據，故須要從新根據這些ID再次從數據庫中查詢。算法
紅色這段話是學習sphinx最爲重要信息。一般爲了快速開發，或者爲了對已有項目進行優化，只能使用第一種方案。第二種插件方式，對於現在orm框架盛行的今天，可能選擇的人會不多，對於咱們.net程序員，更不會考慮。
sql
那咱們先看看Sphinx第一種方式的實現，第一種方式配置比較簡單，根據中文手冊可順利配置完成，重點是配置完成的sphinx，在.net下咱們該如何使用：數據庫
（1）sphinx connector.netc#
sphinx官網自己不支持c#.net的API這讓咱們改怎麼活。不事後來偉大的人出現了，相繼出現了sphinx connector.net爲咱們提供了鏈接sphinx服務器的接口，並且跟linq語法緊密結合，真的很不錯，可是。。。它是付費的，否則搜索出的記錄最多隻能有5條。咱們.net程序員原本工資就不高，放棄，繼續尋找免費的大蘿蔔。。。。
（2）sphinx.client
網上仍是有大牛仿照php的api源碼，寫出了sphinxClient的.net類庫，調調就能用。站在巨人的肩膀上吹風，涼快。。。。
Sphinx在mysql中的使用，無非是爲數據庫各個字段提供更爲快速的索引庫，當mysql出現巨量數據的時候可以提供更爲快速的秒搜能力，若是你還用傳統sql like。。。。結果可想而知。
sphinx自己不支持中文字體的搜索，若是想實現中文的搜索必須使用字符表，或者實現中文分詞。
（1）字符表，sphinx會對中文進行單字切分，進行字索引，速度慢點
字符表的實現很簡單http://www.sphinxsearch.org/archives/80 已經實現。
（2）中文分詞，使用分詞插件如 coreseek，sfc，它裏面有很好的算法，速度現對好點
coreseek至今還在不斷更新，已經到了4版本，推薦使用，可參考資料：http://www.coreseek.cn/docs/coreseek_3.2-sphinx_0.9.9.html#installing 很詳細，真好
當服務器配置完成後咱們建立.net解決方案，實現sphinx服務器的通訊;
using System;
namespace phinxDemo
{
class Program
{
static void Main(string[] args)
{
SphinxClient sphinxClient = new SphinxClient("192.168.233.129", 9312);
Console.WriteLine("請輸入操做模式：[a]查詢，[b]插入新數據，[c]刪除數據");
string inputstr = Console.ReadLine();
while (true)
{
switch (inputstr)
{
case "a":
//查詢數據
Console.WriteLine("---------------查詢數據---------------------");
Console.WriteLine("請輸入匹配的字符串");
QueryData(Console.ReadLine(), sphinxClient);
break;
case "b":
//插入數據
Console.WriteLine("---------------插入數據---------------------");
Console.WriteLine("請輸入要插入的字符串");
break;
case "c":
//刪除數據
Console.WriteLine("---------------刪除數據---------------------");
Console.WriteLine("請輸入要刪除的字符串");
break;
}
}
}
private static void QueryData(string p, SphinxClient sphinxClient)
{
var sphinxSearchResult = sphinxClient.Query(p);
Console.WriteLine("此查詢在服務器檢索所得的匹配文檔總數:{0}", sphinxSearchResult.total);
Console.WriteLine("索引中匹配文檔的總數:{0}", sphinxSearchResult.totalFound);
Console.WriteLine("將查詢關鍵字映射到一個包含關於關鍵字的統計數據的小hash表上:{0}", sphinxSearchResult.totalFound);
Console.WriteLine("searchd報告的錯誤信息:{0}", sphinxSearchResult.error);
Console.WriteLine("searchd報告的警告信息:{0}", sphinxSearchResult.warning);
foreach (SphinxMatch match in sphinxSearchResult.matches)
{
Console.WriteLine("DocumentId {0} Weight {1}", match.docId, match.weight);
}
Console.ReadLine();
}
}
}
提供大牛的sphinxClient
using System;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net.Sockets;
using System.Text;
namespace phinxDemo
{
public class SphinxClient : IDisposable
{
#region Static Values
/* matching modes */
public static int SPH_MATCH_ALL = 0;
public static int SPH_MATCH_ANY = 1;
public static int SPH_MATCH_PHRASE = 2;
public static int SPH_MATCH_BOOLEAN = 3;
public static int SPH_MATCH_EXTENDED = 4;
public static int SPH_MATCH_FULLSCAN = 5;
public static int SPH_MATCH_EXTENDED2 = 6;
/* sorting modes */
public static int SPH_SORT_RELEVANCE = 0;
public static int SPH_SORT_ATTR_DESC = 1;
public static int SPH_SORT_ATTR_ASC = 2;
public static int SPH_SORT_TIME_SEGMENTS = 3;
public static int SPH_SORT_EXTENDED = 4;
public static int SPH_SORT_EXPR = 5;
/* grouping functions */
public static int SPH_GROUPBY_DAY = 0;
public static int SPH_GROUPBY_WEEK = 1;
public static int SPH_GROUPBY_MONTH = 2;
public static int SPH_GROUPBY_YEAR = 3;
public static int SPH_GROUPBY_ATTR = 4;
public static int SPH_GROUPBY_ATTRPAIR = 5;
/* searchd reply status codes */
public static int SEARCHD_OK = 0;
public static int SEARCHD_ERROR = 1;
public static int SEARCHD_RETRY = 2;
public static int SEARCHD_WARNING = 3;
/* attribute types */
public static int SPH_ATTR_INTEGER = 1;
public static int SPH_ATTR_TIMESTAMP = 2;
public static int SPH_ATTR_ORDINAL = 3;
public static int SPH_ATTR_BOOL = 4;
public static int SPH_ATTR_FLOAT = 5;
public static int SPH_ATTR_BIGINT = 6;
public static int SPH_ATTR_MULTI = 0x40000000;
/* searchd commands */
private static int SEARCHD_COMMAND_SEARCH = 0;
private static int SEARCHD_COMMAND_EXCERPT = 1;
private static int SEARCHD_COMMAND_UPDATE = 2;
private static int SEARCHD_COMMAND_KEYWORDS = 3;
private static int SEARCHD_COMMAND_PERSIST = 4;
private static int SEARCHD_COMMAND_STATUS = 5;
private static int SEARCHD_COMMAND_QUERY = 6;
/* searchd command versions */
private static int VER_COMMAND_SEARCH = 0x116;
private static int VER_COMMAND_EXCERPT = 0x100;
private static int VER_COMMAND_UPDATE = 0x102;
private static int VER_COMMAND_KEYWORDS = 0x100;
private static int VER_COMMAND_STATUS = 0x100;
private static int VER_COMMAND_QUERY = 0x100;
/* filter types */
private static int SPH_FILTER_VALUES = 0;
private static int SPH_FILTER_RANGE = 1;
private static int SPH_FILTER_FLOATRANGE = 2;
private static int SPH_CLIENT_TIMEOUT_MILLISEC = 0;
#endregion
#region Variable Declaration
private string _host;
private int _port;
private int _offset;
private int _limit;
private int _mode;
private int[] _weights;
private int _sort;
private string _sortby;
private long _minId;
private long _maxId;
private int _filterCount;
private string _groupBy;
private int _groupFunc;
private string _groupSort;
private string _groupDistinct;
private int _maxMatches;
private int _cutoff;
private int _retrycount;
private int _retrydelay;
private string _latitudeAttr;
private string _longitudeAttr;
private float _latitude;
private float _longitude;
private string _error;
private string _warning;
private Dictionary<string, int> _fieldWeights;
private TcpClient _conn;
// request queries already created
List<byte[]> _requestQueries = new List<byte[]>();
private Dictionary<string, int> _indexWeights;
// use a memorystream instead of a byte array because it's easier to augment
MemoryStream _filterStreamData = new MemoryStream();
#endregion
#region Constructors
/**
* Creates new SphinxClient instance.
*
* Default host and port that the instance will connect to are
* localhost:3312. That can be overriden using {@link #SetServer SetServer()}.
*/
public SphinxClient()
: this(AppConfig.GetSetting("SphinxServer"), AppConfig.GetRequiredSettingAsInt("SphinxServerPort"))
{
}
/**
* Creates new SphinxClient instance, with host:port specification.
*
* Host and port can be later overriden using {@link #SetServer SetServer()}.
*
* @param host searchd host name (default: localhost)
* @param port searchd port number (default: 3312)
*/
public SphinxClient(string host, int port)
{
_host = host;
_port = port;
_offset = 0;
_limit = 20;
_mode = SPH_MATCH_ALL;
_sort = SPH_SORT_RELEVANCE;
_sortby = "";
_minId = 0;
_maxId = 0;
_filterCount = 0;
_groupBy = "";
_groupFunc = SPH_GROUPBY_DAY;
// _groupSort = "@group desc";
_groupSort = "";
_groupDistinct = "";
_maxMatches = 1000;
_cutoff = 0;
_retrycount = 0;
_retrydelay = 0;
_latitudeAttr = null;
_longitudeAttr = null;
_latitude = 0;
_longitude = 0;
_error = "";
_warning = "";
//_reqs = new ArrayList();
_weights = null;
_indexWeights = new Dictionary<string, int>();
_fieldWeights = new Dictionary<string, int>();
}
#endregion
#region Main Functions
/** Connect to searchd server and run current search query against all indexes (syntax sugar). */
public SphinxResult Query(string query)
{
return Query(query, "*");
}
/**
* Connect to searchd server and run current search query.
*
* @param query query string
* @param index index name(s) to query. May contain anything-separated
* list of index names, or "*" which means to query all indexes.
* @return {@link SphinxResult} object
*
* @throws SphinxException on invalid parameters
*/
public SphinxResult Query(string query, string index)
{
//MyAssert(_requestQueries == null || _requestQueries.Count == 0, "AddQuery() and Query() can not be combined; use RunQueries() instead");
AddQuery(query, index);
SphinxResult[] results = RunQueries();
if (results == null || results.Length < 1)
{
return null; /* probably network error; error message should be already filled */
}
SphinxResult res = results[0];
_warning = res.warning;
_error = res.error;
return res;
}
public int AddQuery(string query, string index)
{
byte[] outputdata = new byte[2048];
/* build request */
try
{
MemoryStream ms = new MemoryStream();
BinaryWriter sw = new BinaryWriter(ms);
WriteToStream(sw, _offset);
WriteToStream(sw, _limit);
WriteToStream(sw, _mode);
WriteToStream(sw, 0); //SPH_RANK_PROXIMITY_BM25
WriteToStream(sw, _sort);
WriteToStream(sw, _sortby);
WriteToStream(sw, query);
//_weights = new int[] { 100, 1 };
_weights = null;
int weightLen = _weights != null ? _weights.Length : 0;
WriteToStream(sw, weightLen);
if (_weights != null)
{
for (int i = 0; i < _weights.Length; i++)
WriteToStream(sw, _weights[i]);
}
WriteToStream(sw, index);
WriteToStream(sw, 1); // id64
WriteToStream(sw, _minId);
WriteToStream(sw, _maxId);
/* filters */
WriteToStream(sw, _filterCount);
if (_filterCount > 0 && _filterStreamData.Length > 0)
{
byte[] filterdata = new byte[_filterStreamData.Length];
_filterStreamData.Seek(0, SeekOrigin.Begin);
_filterStreamData.Read(filterdata, 0, (int)_filterStreamData.Length);
WriteToStream(sw, filterdata);
}
/* group-by, max matches, sort-by-group flag */
WriteToStream(sw, _groupFunc);
WriteToStream(sw, _groupBy);
WriteToStream(sw, _maxMatches);
WriteToStream(sw, _groupSort);
WriteToStream(sw, _cutoff);
WriteToStream(sw, _retrycount);
WriteToStream(sw, _retrydelay);
WriteToStream(sw, _groupDistinct);
/* anchor point */
if (_latitudeAttr == null || _latitudeAttr.Length == 0 || _longitudeAttr == null || _longitudeAttr.Length == 0)
{
WriteToStream(sw, 0);
}
else
{
WriteToStream(sw, 1);
WriteToStream(sw, _latitudeAttr);
WriteToStream(sw, _longitudeAttr);
WriteToStream(sw, _latitude);
WriteToStream(sw, _longitude);
}
/* per-index weights */
//sw.Write(_indexWeights.size());
WriteToStream(sw, this._indexWeights.Count);
foreach (KeyValuePair<string, int> item in this._indexWeights)
{
WriteToStream(sw, item.Key);
WriteToStream(sw, item.Value);
}
// max query time
WriteToStream(sw, 0);
// per-field weights
WriteToStream(sw, this._fieldWeights.Count);
foreach (KeyValuePair<string, int> item in this._fieldWeights)
{
WriteToStream(sw, item.Key);
WriteToStream(sw, item.Value);
}
// comment
WriteToStream(sw, "");
// attribute overrides
WriteToStream(sw, 0);
// select-list
WriteToStream(sw, "*");
sw.Flush();
ms.Seek(0, SeekOrigin.Begin);
byte[] data = new byte[ms.Length];
ms.Read(data, 0, (int)ms.Length);
int qIndex = _requestQueries.Count;
_requestQueries.Add(data);
return qIndex;
}
catch (Exception ex)
{
//MyAssert(false, "error on AddQuery: " + ex.Message);
}
return -1;
}
/** Run all previously added search queries. */
public SphinxResult[] RunQueries()
{
if (_requestQueries == null || _requestQueries.Count < 1)
{
_error = "no queries defined, issue AddQuery() first";
return null;
}
if (Conn == null) return null;
MemoryStream ms = new MemoryStream();
BinaryWriter bw = new BinaryWriter(ms);
/* send query, get response */
int nreqs = _requestQueries.Count;
try
{
WriteToStream(bw, (short)SEARCHD_COMMAND_SEARCH);
WriteToStream(bw, (short)VER_COMMAND_SEARCH);
//return null;
int rqLen = 4;
for (int i = 0; i < nreqs; i++)
{
byte[] subRq = (byte[])_requestQueries[i];
rqLen += subRq.Length;
}
WriteToStream(bw, rqLen);
WriteToStream(bw, nreqs);
for (int i = 0; i < nreqs; i++)
{
byte[] subRq = (byte[])_requestQueries[i];
WriteToStream(bw, subRq);
}
ms.Flush();
byte[] buffer = new byte[ms.Length];
ms.Seek(0, SeekOrigin.Begin);
ms.Read(buffer, 0, buffer.Length);
bw = new BinaryWriter(Conn.GetStream());
bw.Write(buffer, 0, buffer.Length);
bw.Flush();
bw.BaseStream.Flush();
ms.Close();
}
catch (Exception e)
{
//MyAssert(false, "Query: Unable to create read/write streams: " + e.Message);
return null;
}
/* get response */
byte[] response = GetResponse(Conn, VER_COMMAND_SEARCH);
/* parse response */
SphinxResult[] results = ParseResponse(response);
/* reset requests */
_requestQueries = new List<byte[]>();
return results;
}
private SphinxResult[] ParseResponse(byte[] response)
{
if (response == null) return null;
/* parse response */
SphinxResult[] results = new SphinxResult[_requestQueries.Count];
BinaryReader br = new BinaryReader(new MemoryStream(response));
/* read schema */
int ires;
try
{
for (ires = 0; ires < _requestQueries.Count; ires++)
{
SphinxResult res = new SphinxResult();
results[ires] = res;
int status = ReadInt32(br);
res.setStatus(status);
if (status != SEARCHD_OK)
{
string message = ReadUtf8(br);
if (status == SEARCHD_WARNING)
{
res.warning = message;
}
else
{
res.error = message;
continue;
}
}
/* read fields */
int nfields = ReadInt32(br);
res.fields = new string[nfields];
//int pos = 0;
for (int i = 0; i < nfields; i++)
res.fields[i] = ReadUtf8(br);
/* read arrts */
int nattrs = ReadInt32(br);
res.attrTypes = new int[nattrs];
res.attrNames = new string[nattrs];
for (int i = 0; i < nattrs; i++)
{
string AttrName = ReadUtf8(br);
int AttrType = ReadInt32(br);
res.attrNames[i] = AttrName;
res.attrTypes[i] = AttrType;
}
/* read match count */
int count = ReadInt32(br);
int id64 = ReadInt32(br);
res.matches = new SphinxMatch[count];
for (int matchesNo = 0; matchesNo < count; matchesNo++)
{
SphinxMatch docInfo;
docInfo = new SphinxMatch(
(id64 == 0) ? ReadUInt32(br) : ReadInt64(br),
ReadInt32(br));
/* read matches */
for (int attrNumber = 0; attrNumber < res.attrTypes.Length; attrNumber++)
{
string attrName = res.attrNames[attrNumber];
int type = res.attrTypes[attrNumber];
/* handle bigint */
if (type == SPH_ATTR_BIGINT)
{
docInfo.attrValues.Add(ReadInt64(br));
continue;
}
/* handle floats */
if (type == SPH_ATTR_FLOAT)
{
docInfo.attrValues.Add(ReadFloat(br));
//docInfo.attrValues.add ( attrNumber, bw.ReadDouble ) );
//throw new NotImplementedException("we don't read floats yet");
continue;
}
/* handle everything else as unsigned ints */
long val = ReadUInt32(br);
if ((type & SPH_ATTR_MULTI) != 0)
{
long[] vals = new long[(int)val];
for (int k = 0; k < val; k++)
vals[k] = ReadUInt32(br);
docInfo.attrValues.Add(vals);
}
else
{
docInfo.attrValues.Add(val);
}
}
res.matches[matchesNo] = docInfo;
}
res.total = ReadInt32(br);
res.totalFound = ReadInt32(br);
res.time = ReadInt32(br) / 1000.0f; /* format is %.3f */
int wordsCount = ReadInt32(br);
//res.words = new SphinxWordInfo[ReadInt32(bw)];
//for (int i = 0; i < res.words.Length; i++)
// res.words[i] = new SphinxWordInfo(ReadUtf8(bw), ReadUInt32(bw), ReadUInt32(bw));
}
br.Close();
return results;
}
catch (IOException e)
{
//MyAssert(false, "unable to parse response: " + e.Message);
return null;
}
}
private TcpClient Conn
{
get
{
try
{
if (_conn == null || !_conn.Connected)
{
_conn = new TcpClient(_host, _port);
NetworkStream ns = _conn.GetStream();
BinaryReader sr = new BinaryReader(ns);
BinaryWriter sw = new BinaryWriter(ns);
// check the version.
WriteToStream(sw, 1);
sw.Flush();
int version = 0;
version = ReadInt32(sr);
if (version < 1)
{
_conn.Close();
// "expected searchd protocol version 1+, got version " + version;
_conn = null;
return null;
}
// set persist connect
WriteToStream(sw, (short)4); // COMMAND_Persist
WriteToStream(sw, (short)0); //PERSIST_COMMAND_VERSION
WriteToStream(sw, 4); // COMMAND_LENGTH
WriteToStream(sw, 1); // PERSIST_COMMAND_BODY
sw.Flush();
}
}
catch (IOException e)
{
try
{
_conn.Close();
}
catch
{
_conn = null;
}
return null;
}
return _conn;
}
}
#endregion
#region Getters and Setters
/**
* Get last error message, if any.
*
* @return string with last error message (empty string if no errors occured)
*/
public string GetLastError()
{
return _error;
}
/**
* Get last warning message, if any.
*
* @return string with last warning message (empty string if no errors occured)
*/
public string GetLastWarning()
{
return _warning;
}
/**
* Set searchd host and port to connect to.
*
* @param host searchd host name (default: localhost)
* @param port searchd port number (default: 3312)
*
* @throws SphinxException on invalid parameters
*/
public void SetServer(string host, int port)
{
//MyAssert(host != null && host.Length > 0, "host name must not be empty");
//MyAssert(port > 0 && port < 65536, "port must be in 1..65535 range");
_host = host;
_port = port;
}
/** Set matches offset and limit to return to client, max matches to retrieve on server, and cutoff. */
public void SetLimits(int offset, int limit, int max, int cutoff)
{
//MyAssert(offset >= 0, "offset must be greater than or equal to 0");
//MyAssert(limit > 0, "limit must be greater than 0");
//MyAssert(max > 0, "max must be greater than 0");
//MyAssert(cutoff >= 0, "max must be greater than or equal to 0");
_offset = offset;
_limit = limit;
_maxMatches = max;
_cutoff = cutoff;
}
/** Set matches offset and limit to return to client, and max matches to retrieve on server. */
public void SetLimits(int offset, int limit, int max)
{
SetLimits(offset, limit, max, _cutoff);
}
/** Set matches offset and limit to return to client. */
public void SetLimits(int offset, int limit)
{
SetLimits(offset, limit, _maxMatches, _cutoff);
}
/** Set matching mode. */
public void SetMatchMode(int mode)
{
//MyAssert(
// mode == SPH_MATCH_ALL ||
// mode == SPH_MATCH_ANY ||
// mode == SPH_MATCH_PHRASE ||
// mode == SPH_MATCH_BOOLEAN ||
// mode == SPH_MATCH_EXTENDED, "unknown mode value; use one of the available SPH_MATCH_xxx constants");
_mode = mode;
}
/** Set sorting mode. */
public void SetSortMode(int mode, string sortby)
{
//MyAssert(
// mode == SPH_SORT_RELEVANCE ||
// mode == SPH_SORT_ATTR_DESC ||
// mode == SPH_SORT_ATTR_ASC ||
// mode == SPH_SORT_TIME_SEGMENTS ||
// mode == SPH_SORT_EXTENDED, "unknown mode value; use one of the available SPH_SORT_xxx constants");
//MyAssert(mode == SPH_SORT_RELEVANCE || (sortby != null && sortby.Length > 0), "sortby string must not be empty in selected mode");
_sort = mode;
_sortby = (sortby == null) ? "" : sortby;
}
/** Set per-field weights (all values must be positive). */
public void SetWeights(int[] weights)
{
//MyAssert(weights != null, "weights must not be null");
for (int i = 0; i < weights.Length; i++)
{
int weight = weights[i];
//MyAssert(weight > 0, "all weights must be greater than 0");
}
_weights = weights;
}
public void SetFieldWeights(string field, int weight)
{
if (this._fieldWeights.ContainsKey(field)) this._fieldWeights[field] = weight;
else this._fieldWeights.Add(field, weight);
}
/**
* Set per-index weights
*
* @param indexWeights hash which maps string index names to Integer weights
*/
public void SetIndexWeights(string index, int weight)
{
if (this._indexWeights.ContainsKey(index)) this._indexWeights[index] = weight;
else this._indexWeights.Add(index, weight);
}
/**
* Set document IDs range to match.
*
* Only match those documents where document ID is beetwen given
* min and max values (including themselves).
*
* @param min minimum document ID to match
* @param max maximum document ID to match
*
* @throws SphinxException on invalid parameters
*/
public void SetIDRange(int min, int max)
{
//MyAssert(min <= max, "min must be less or equal to max");
_minId = min;
_maxId = max;
}
/**
* Set values filter.
*
* Only match those documents where <code>attribute</code> column value
* is in given values set.
*
* @param attribute attribute name to filter by
* @param values values set to match the attribute value by
* @param exclude whether to exclude matching documents instead
*
* @throws SphinxException on invalid parameters
*/
public void SetFilter(string attribute, long[] values, bool exclude)
{
//MyAssert(values != null && values.Length > 0, "values array must not be null or empty");
//MyAssert(attribute != null && attribute.Length > 0, "attribute name must not be null or empty");
if (values == null || values.Length == 0) return;
try
{
BinaryWriter bw = new BinaryWriter(_filterStreamData);
WriteToStream(bw, attribute);
WriteToStream(bw, SPH_FILTER_VALUES);
WriteToStream(bw, values.Length);
for (int i = 0; i < values.Length; i++)
WriteToStream(bw, values[i]);
WriteToStream(bw, exclude ? 1 : 0);
}
catch (Exception e)
{
//MyAssert(false, "IOException: " + e.Message);
}
_filterCount++;
}
public void SetFilter(string attribute, int[] values, bool exclude)
{
//MyAssert(values != null && values.Length > 0, "values array must not be null or empty");
//MyAssert(attribute != null && attribute.Length > 0, "attribute name must not be null or empty");
if (values == null || values.Length == 0) return;
long[] v = new long[values.Length];
for (int i = 0; i < values.Length; i++) v[i] = (long)values[i];
SetFilter(attribute, v, exclude);
}
/** Set values filter with a single value (syntax sugar; see {@link #SetFilter(string,int[],bool)}). */
public void SetFilter(string attribute, long value, bool exclude)
{
long[] values = new long[] { value };
SetFilter(attribute, values, exclude);
}
/** Set values filter with a single value (syntax sugar; see {@link #SetFilter(string,int[],bool)}). */
public void SetFilter(string attribute, int value, bool exclude)
{
long[] values = new long[] { value };
SetFilter(attribute, values, exclude);
}
public void SetFilter(string attribute, bool value, bool exclude)
{
SetFilter(attribute, value ? 1 : 0, exclude);
}
public void SetFilter(string attribute, DateTime value, bool exclude)
{
SetFilter(attribute, ConvertToUnixTimestamp(value), exclude);
}
public void SetFilter(string attribute, DateTime[] values, bool exclude)
{
if (values == null || values.Length == 0) return;
int[] items = new int[values.Length];
for (int i = 0; i < items.Length; i++) items[i] = ConvertToUnixTimestamp(values[i]);
SetFilter(attribute, items, exclude);
}
/**
* Set integer range filter.
*
* Only match those documents where <code>attribute</code> column value
* is beetwen given min and max values (including themselves).
*
* @param attribute attribute name to filter by
* @param min min attribute value
* @param max max attribute value
* @param exclude whether to exclude matching documents instead
*
* @throws SphinxException on invalid parameters
*/
public void SetFilterRange(string attribute, int min, int max, bool exclude)
{
SetFilterRange(attribute, (long)min, (long)max, exclude);
}
public void SetFilterRange(string attribute, DateTime min, DateTime max, bool exclude)
{
SetFilterRange(attribute, ConvertToUnixTimestamp(min), ConvertToUnixTimestamp(max), exclude);
}
public void SetFilterRange(string attribute, long min, long max, bool exclude)
{
//MyAssert(min <= max, "min must be less or equal to max");
try
{
BinaryWriter bw = new BinaryWriter(_filterStreamData);
WriteToStream(bw, attribute);
WriteToStream(bw, SPH_FILTER_RANGE);
WriteToStream(bw, min);
WriteToStream(bw, max);
WriteToStream(bw, exclude ? 1 : 0);
}
catch (Exception e)
{
//MyAssert(false, "IOException: " + e.Message);
}
_filterCount++;
}
/**
* Set float range filter.
*
* Only match those documents where <code>attribute</code> column value
* is beetwen given min and max values (including themselves).
*
* @param attribute attribute name to filter by
* @param min min attribute value
* @param max max attribute value
* @param exclude whether to exclude matching documents instead
*
* @throws SphinxException on invalid parameters
* Set float range filter.
*/
public void SetFilterFloatRange(string attribute, float min, float max, bool exclude)
{
//MyAssert(min <= max, "min must be less or equal to max");
try
{
BinaryWriter bw = new BinaryWriter(_filterStreamData);
WriteToStream(bw, attribute);
WriteToStream(bw, SPH_FILTER_FLOATRANGE);
WriteToStream(bw, min);
WriteToStream(bw, max);
WriteToStream(bw, exclude ? 1 : 0);
}
catch (Exception e)
{
//MyAssert(false, "IOException: " + e.Message);
}
_filterCount++;
}
/** Reset all currently set filters (for multi-queries). */
public void ResetFilters()
{
/* should we close them first? */
_filterStreamData = new MemoryStream();
_filterCount = 0;
/* reset GEO anchor */
_latitudeAttr = null;
_longitudeAttr = null;
_latitude = 0;
_longitude = 0;
}
/**
* Setup geographical anchor point.
*
* Required to use @geodist in filters and sorting.
* Distance will be computed to this point.
*
* @param latitudeAttr the name of latitude attribute
* @param longitudeAttr the name of longitude attribute
* @param latitude anchor point latitude, in radians
* @param longitude anchor point longitude, in radians
*
* @throws SphinxException on invalid parameters
*/
public void SetGeoAnchor(string latitudeAttr, string longitudeAttr, float latitude, float longitude)
{
//MyAssert(latitudeAttr != null && latitudeAttr.Length > 0, "longitudeAttr string must not be null or empty");
//MyAssert(longitudeAttr != null && longitudeAttr.Length > 0, "longitudeAttr string must not be null or empty");
_latitudeAttr = latitudeAttr;
_longitudeAttr = longitudeAttr;
_latitude = latitude;
_longitude = longitude;
}
/** Set grouping attribute and function. */
public void SetGroupBy(string attribute, int func, string groupsort)
{
//MyAssert(
// func == SPH_GROUPBY_DAY ||
// func == SPH_GROUPBY_WEEK ||
// func == SPH_GROUPBY_MONTH ||
// func == SPH_GROUPBY_YEAR ||
// func == SPH_GROUPBY_ATTR ||
// func == SPH_GROUPBY_ATTRPAIR, "unknown func value; use one of the available SPH_GROUPBY_xxx constants");
_groupBy = attribute;
_groupFunc = func;
_groupSort = groupsort;
}
/** Set grouping attribute and function with default ("@group desc") groupsort (syntax sugar). */
public void SetGroupBy(string attribute, int func)
{
SetGroupBy(attribute, func, "@group desc");
}
/** Set count-distinct attribute for group-by queries. */
public void SetGroupDistinct(string attribute)
{
_groupDistinct = attribute;
}
/** Set distributed retries count and delay. */
public void SetRetries(int count, int delay)
{
//MyAssert(count >= 0, "count must not be negative");
//MyAssert(delay >= 0, "delay must not be negative");
_retrycount = count;
_retrydelay = delay;
}
/** Set distributed retries count with default (zero) delay (syntax sugar). */
public void SetRetries(int count)
{
SetRetries(count, 0);
}
#endregion
#region Private Methods
/** Get and check response packet from searchd (internal method). */
private byte[] GetResponse(TcpClient sock, int client_ver)
{
/* connect */
BinaryReader br = null;
NetworkStream SockInput = null;
try
{
SockInput = sock.GetStream();
br = new BinaryReader(SockInput);
}
catch (IOException e)
{
//MyAssert(false, "getInputStream() failed: " + e.Message);
return null;
}
/* read response */
byte[] response = null;
int status = 0, ver = 0;
int len = 0;
try
{
/* read status fields */
status = ReadInt16(br);
ver = ReadInt16(br);
len = ReadInt32(br);
/* read response if non-empty */
//MyAssert(len > 0, "zero-sized searchd response body");
if (len > 0)
{
response = br.ReadBytes(len);
}
else
{
/* FIXME! no response, return null? */
}
/* check status */
if (status == SEARCHD_WARNING)
{
//DataInputStream in = new DataInputStream ( new ByteArrayInputStream ( response ) );
//int iWarnLen = in.ReadInt32 ();
//_warning = new string ( response, 4, iWarnLen );
//System.arraycopy ( response, 4+iWarnLen, response, 0, response.Length-4-iWarnLen );
_error = "searchd warning";
return null;
}
else if (status == SEARCHD_ERROR)
{
_error = "searchd error: " + Encoding.UTF8.GetString(response, 4, response.Length - 4);
return null;
}
else if (status == SEARCHD_RETRY)
{
_error = "temporary searchd error: " + Encoding.UTF8.GetString(response, 4, response.Length - 4);
return null;
}
else if (status != SEARCHD_OK)
{
_error = "searched returned unknown status, code=" + status;
return null;
}
}
catch (IOException e)
{
if (len != 0)
{
/* get trace, to provide even more failure details */
//PrintWriter ew = new PrintWriter ( new StringWriter() );
//e.printStackTrace ( ew );
//ew.flush ();
//ew.close ();
//string sTrace = ew.toString ();
/* build error message */
_error = "failed to read searchd response (status=" + status + ", ver=" + ver + ", len=" + len + ", trace=" + e.StackTrace + ")";
}
else
{
_error = "received zero-sized searchd response (searchd crashed?): " + e.Message;
}
return null;
}
finally
{
try
{
if (br != null) br.Close();
if (sock != null && !sock.Connected) sock.Close();
}
catch (IOException e)
{
/* silently ignore close failures; nothing could be done anyway */
}
}
return response;
}
/** Connect to searchd and exchange versions (internal method). */
//private TcpClient Connect()
//{
// TcpClient sock;
// try
// {
// //sock = new Socket(_host, _port);
// //sock = new Socket(AddressFamily.InterNetwork, SocketType.Raw, ProtocolType.IPv4);
// sock = new TcpClient(_host, _port);
// //sock.ReceiveTimeout = SPH_CLIENT_TIMEOUT_MILLISEC;
// }
// catch (Exception e)
// {
// _error = "connection to " + _host + ":" + _port + " failed: " + e.Message;
// return null;
// }
// NetworkStream ns = null;
// try
// {
// ns = sock.GetStream();
// BinaryReader sr = new BinaryReader(ns);
// BinaryWriter sw = new BinaryWriter(ns);
// WriteToStream(sw, 1);
// sw.Flush();
// int version = 0;
// version = ReadInt32(sr);
// if (version < 1)
// {
// sock.Close();
// _error = "expected searchd protocol version 1+, got version " + version;
// return null;
// }
// //WriteToStream(sw, VER_MAJOR_PROTO);
// //sw.Flush();
// WriteToStream(sw, (short)4); // COMMAND_Persist
// WriteToStream(sw, (short)0); //PERSIST_COMMAND_VERSION
// WriteToStream(sw, 4); // COMMAND_LENGTH
// WriteToStream(sw, 1); // PERSIST_COMMAND_BODY
// sw.Flush();
// }
// catch (IOException e)
// {
// _error = "Connect: Read from socket failed: " + e.Message;
// try
// {
// sock.Close();
// }
// catch (IOException e1)
// {
// _error = _error + " Cannot close socket: " + e1.Message;
// }
// return null;
// }
// return sock;
//}
#endregion
#region Network IO Helpers
private string ReadUtf8(BinaryReader br)
{
int length = ReadInt32(br);
if (length > 0)
{
byte[] data = br.ReadBytes(length);
return Encoding.UTF8.GetString(data);
}
return "";
}
private short ReadInt16(BinaryReader br)
{
byte[] idata = br.ReadBytes(2);
if (BitConverter.IsLittleEndian)
Array.Reverse(idata);
return BitConverter.ToInt16(idata, 0);
//return BitConverter.ToInt16(_Reverse(idata), 0);
}
private int ReadInt32(BinaryReader br)
{
byte[] idata = br.ReadBytes(4);
if (BitConverter.IsLittleEndian)
Array.Reverse(idata);
return BitConverter.ToInt32(idata, 0);
//return BitConverter.ToInt32(_Reverse(idata), 0);
}
private float ReadFloat(BinaryReader br)
{
byte[] idata = br.ReadBytes(4);
if (BitConverter.IsLittleEndian)
Array.Reverse(idata);
return BitConverter.ToSingle(idata, 0);
//return BitConverter.ToSingle(_Reverse(idata), 0);
}
private uint ReadUInt32(BinaryReader br)
{
byte[] idata = br.ReadBytes(4);
if (BitConverter.IsLittleEndian)
Array.Reverse(idata);
return BitConverter.ToUInt32(idata, 0);
//return BitConverter.ToUInt32(_Reverse(idata), 0);
}
private Int64 ReadInt64(BinaryReader br)
{
byte[] idata = br.ReadBytes(8);
if (BitConverter.IsLittleEndian)
Array.Reverse(idata);
return BitConverter.ToInt64(idata, 0);
//return BitConverter.ToInt64(_Reverse(idata), 0);
}
private void WriteToStream(BinaryWriter bw, short data)
{
byte[] d = BitConverter.GetBytes(data);
if (BitConverter.IsLittleEndian)
Array.Reverse(d);
bw.Write(d);
//sw.Write(_Reverse(d));
}
private void WriteToStream(BinaryWriter bw, int data)
{
byte[] d = BitConverter.GetBytes(data);
if (BitConverter.IsLittleEndian)
Array.Reverse(d);
bw.Write(d);
//sw.Write(_Reverse(d));
}
private void WriteToStream(BinaryWriter bw, float data)
{
byte[] d = BitConverter.GetBytes(data);
if (BitConverter.IsLittleEndian)
Array.Reverse(d);
bw.Write(d);
//sw.Write(_Reverse(d));
}
private void WriteToStream(BinaryWriter bw, long data)
{
byte[] d = BitConverter.GetBytes(data);
if (BitConverter.IsLittleEndian)
Array.Reverse(d);
bw.Write(d);
//sw.Write(_Reverse(d));
}
private void WriteToStream(BinaryWriter bw, byte[] data)
{
bw.Write(data);
}
private void WriteToStream(BinaryWriter bw, string data)
{
byte[] d = Encoding.UTF8.GetBytes(data);
WriteToStream(bw, d.Length);
bw.Write(d);
}
#endregion
#region Other Helpers
static readonly DateTime _epoch = new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc);
public static int ConvertToUnixTimestamp(DateTime dateTime)
{
TimeSpan diff = dateTime.ToUniversalTime() - _epoch;
return Convert.ToInt32(Math.Floor(diff.TotalSeconds));
}
#endregion
#region IDisposable Members
public void Dispose()
{
if (this._conn != null)
{
try
{
if (this._conn.Connected)
this._conn.Close();
}
finally
{
this._conn = null;
}
}
}
#endregion
}
public class SphinxResult
{
/** Full-text field namess. */
public String[] fields;
/** Attribute names. */
public String[] attrNames;
/** Attribute types (refer to SPH_ATTR_xxx constants in SphinxClient). */
public int[] attrTypes;
/** Retrieved matches. */
public SphinxMatch[] matches;
/** Total matches in this result set. */
public int total;
/** Total matches found in the index(es). */
public int totalFound;
/** Elapsed time (as reported by searchd), in seconds. */
public float time;
/** Per-word statistics. */
public SphinxWordInfo[] words;
/** Warning message, if any. */
public String warning = null;
/** Error message, if any. */
public String error = null;
/** Query status (refer to SEARCHD_xxx constants in SphinxClient). */
private int status = -1;
/** Trivial constructor, initializes an empty result set. */
public SphinxResult()
{
this.attrNames = new String[0];
this.matches = new SphinxMatch[0]; ;
this.words = new SphinxWordInfo[0];
this.fields = new String[0];
this.attrTypes = new int[0];
}
public bool Success
{
get
{
return this.status == SphinxClient.SEARCHD_OK;
}
}
/** Get query status. */
public int getStatus()
{
return status;
}
/** Set query status (accessible from API package only). */
internal void setStatus(int status)
{
this.status = status;
}
}
public class SphinxMatch
{
/** Matched document ID. */
public long docId;
/** Matched document weight. */
public int weight;
/** Matched document attribute values. */
public ArrayList attrValues;
/** Trivial constructor. */
public SphinxMatch(long docId, int weight)
{
this.docId = docId;
this.weight = weight;
this.attrValues = new ArrayList();
}
}
public class SphinxWordInfo
{
/** Word form as returned from search daemon, stemmed or otherwise postprocessed. */
public String word;
/** Total amount of matching documents in collection. */
public long docs;
/** Total amount of hits (occurences) in collection. */
public long hits;
/** Trivial constructor. */
public SphinxWordInfo(String word, long docs, long hits)
{
this.word = word;
this.docs = docs;
this.hits = hits;
}
}
}
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