title: Trouble inserting polygon to mysql database
body: <p>I tried inserting </p>
  
  <pre><code>PolygonFromText("POLYGON((121.44842136764532 31.22119260287111,
                            121.45076025390631 31.221990825071376,
                            121.45402182006842 31.218366658611853,
                            121.45091045761114 31.217054584347302))")
  </code></pre>
  
  <p>as a value into a a field of both type Polygon and of type Geometry.</p>
  
  <p>When I run </p>
  
  <pre><code>SELECT PolygonFromText("POLYGON((121.44842136764532 31.22119260287111,
                                   121.45076025390631 31.221990825071376,
                                   121.45402182006842 31.218366658611853,
                                   121.45091045761114 31.217054584347302))")
  </code></pre>
  
  <p>it returns <em><code>NULL</code></em></p>
  
  <p>My Mysql Version is 5.1.41 - I find the MySql documentation very poor and not user friendly in these cases</p>