[转贴]实现类似于baidu的那种用空格键的分词查询

实现类似于baidu的那种用空格键的分词查询
【全文】
///
/// 实现类似于baidu的那种用空格键的分词查询
///
/// 要查询表的字段集合
/// 要查询的表名
/// 查询的关键字
/// 查询的模式
/// 具体的查询语句
private string GetSearchWord(string[] tableField ,string tableName ,string strKeyword ,string strSearchMode)
{
StringBuilder strCondition = new StringBuilder();
string [] KeywordArray;
string strTemp = "";
strCondition.Append("SELECT ");
string strWhere ="";
// 获得要查询表的字段名称
foreach(string sqlField in tableField)
{
strWhere += sqlField + "," ;
}
strWhere = strWhere.TrimEnd(new char[]{','});
strCondition.Append(strWhere + " FROM "+tableName+" WHERE ");

if(strKeyword.IndexOf(',')!=-1)
KeywordArray=strKeyword.Split(',');
else
if(strKeyword.IndexOf('|')!=-1)
KeywordArray=strKeyword.Split('|');
else
KeywordArray=strKeyword.Split(null);
// 完全匹配模式
if(strSearchMode == "1")
{
strWhere="";
foreach(string sqlField in tableField)
{
strWhere += sqlField + "+";
}
strWhere=strWhere.TrimEnd(new char[] {'+'});
strTemp += strWhere + " like '%"+strKeyword+"%'";
}
else
{
// 部分匹配模式
if(strSearchMode=="2")
{
strWhere = "";
foreach(string sqlField in tableField)
{
strWhere += sqlField + "+";
}
strWhere=strWhere.TrimEnd(new char[] {'+'});
strTemp += strWhere + " like '";
strWhere="";
for (int i=0;i {
strWhere+="%"+KeywordArray[i];
}
strTemp+=strWhere +"%'";
}
// 单词匹配模式
if(strSearchMode=="3")
{
strWhere="";
foreach(string sqlField in tableField)
{
strWhere +=" "+ sqlField + "+";
}
strWhere=strWhere.TrimEnd(new char[] {'+'});

string strSqlKeyword="";
for (int i=0;i {
strSqlKeyword+=strWhere+" like" +" '%"+KeywordArray[i]+"%' or";
}
strSqlKeyword=strSqlKeyword.TrimEnd(new char[] {'o','r'});
strTemp +=strSqlKeyword;
}
}
return strCondition.Append(strTemp).ToString();

}