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POSQL search with logical operators
 

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    <p>I have a asp.net web application that needs a search page that searches for data in a specific table (SQL). Today it only has a simple LIKE query, useing parametized sql:</p> <pre><code>SqlParameter[] param = new SqlParameter[1]; param[0] = new SqlParameter("@searchText", SqlDbType.VarChar); param[0].Value = "%" + text + "%"; using (SqlDataReader dr = SqlHelper.ExecuteReader(this.ConnectionString, CommandType.StoredProcedure, "isp_Search", param)) { //Do something } </code></pre> <p>Now I need to add the option to use logical operators to the search.</p> <p>So in the textbox a user might search for things like </p> <pre><code>Adam OR Adams James AND NOT Jame Douglas AND (Adam OR Adams) </code></pre> <p>Adding full-text indexing to the table is not a preferred option since I do not control the data model.</p> <p>I'm looking for a method of interpreting the text queries and convert into a SQL statement with the appropriate number of SqlParams.</p> <pre><code>searchexpression = "Douglas AND (Adam OR Adams)" MakeSearchQuery(searchexpression, out sqlquery, out SqlParam[] params) </code></pre> <p>Would return somelike like</p> <pre><code>sqlquery = "SELECT someFields FROM table WHERE someField=@Param1 AND (someField=@Param2 OR someField=@Param3)" </code></pre> <p>And a sqlParams like</p> <pre><code>sqlParam[0] = 'Douglas' sqlParam[1] = 'Adam' sqlParam[2] = 'Adams' </code></pre> <p>Now there must be someone that have made something like this before? I've search both SO and Google without any real success. And pointers to either open source/free code or a good idea on how to convert the search expression into SQL is welcome.</p>
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    1. COWhich SQL engine do you work with, the answer differs per database. some support regexp, some do not.
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