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POC++ memory table
 

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    <p>Can anyone recommend a <strong>lightweight</strong> open source C++ table data structure that has data access similar to a database table? (i.e. a 2D array but with named columns - ideally, each column will hold data of a single type [see below]).</p> <p>I have had a quick look on Google, but have not found anything very useful.</p> <p>The way I see it, these are the options available to me:</p> <ol> <li>Write my own from scratch (don't really want to invent the wheel)</li> <li>rip out the SimpleResult class from mySQL++ and hack around it</li> <li>use <a href="http://www.sqlite.org/index.html" rel="nofollow noreferrer">sqlite</a> (don't know how lightwight this will be - since I don't need the querying engine and all the other stuff)</li> <li>Ask in here to see if anyone is aware of such a library</li> </ol> <p>So here I am, choosing the quickest route (hopefully one that will also prove to be the the most efficient use of my time - since whatever is recommended here is likely to be peer reviewed).</p> <p>So, can anyone recommend a C++ class/ set of classes that provides a "database table like" interface?</p> <p>The main requirements are:</p> <ol> <li>Columns have names</li> <li>Cells can be accessed using row, column indexes</li> <li>I Can add rows and columns to the table (ideally, I can remove them too)</li> <li>(Nice to have): columns can have types, so it saves teh cost of converting to/from strings</li> </ol> <p><strong>[EDIT]</strong></p> <p>To further demonstrate how I want to use the library, please see the pseudo code below to see simple use of such a class (simple, meaning now iteration of rows and columns - which would be really cool). For now just keeping things simple:</p> <pre><code>typedef MemoryTable::ColType ColumnType; table = new MemoryTable(); // Set up the structure (this can be modified later using removeColumn() etc table-&gt;addColumn(ColumnType::Integer, 'id'); table-&gt;addColumn(ColumnType::String, 'name'); table-&gt;addColumn(ColumnType::Boolean, 'gender'); table-&gt;addColumn(ColumnType::Double, 'weight'); for (size_t i=0; i&lt;10; i++) { table-&gt;addRow(); numrows = table-&gt;getNumRows(); std::cout &lt;&lt; "We now have " &lt;&lt; numrows &lt;&lt; " rows.\n"; // Note can access cells using column name or index // Also using generic value getter/setter methods. Can throw exception on type mismatch table-&gt;setValue(i, 'id', i*i); table-&gt;setValue(i, 'name', getRandomSimpsonCharacterName()); //just to show use of a getter method table-&gt;setValue(i, 'gender', checkGender(table-&gt;getValue(i, 'name'))); table-&gt;setValue(i, 3, guessWeight(table-&gt;getValue(i, 'name'))); } </code></pre>
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    1. COOoh there are lots of these around. You can get my own version as part of the alib library for my FOSS tool CSVfix at http://code.google.com/p/csvfix - it's in a_table.cpp. Not great OO code, but it has been used quite a bit.
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    2. COHi Neil, I had a look at your library. although very comprehensive, I dont know if it is capable of the kind of lightweight in memory type operations I want to carry out (please see my edited question). If your library can be used in that manner, then please kindly shed some light (i.e. a few lines of code) on how I may be use you library in the manner described in my question.
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    3. COOk, I wrote up a simple class for this. Currently, it can only hold data for a single data type. Shall I modify this question and post it here for comments/critiscisms/suggestions/enhancements etc? (its approx 250 lines ....
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