title: about get value from sqlite
body: <p>Code Sample:</p>
  
  <pre><code>NSString *str= [NSString stringWithUTF8String:(char *)sqlite3_column_text(selectStatement, 1)];
  Test *t=[[Test alloc] init];
  t.str=[str copy]; // why use "copy" here?
  [str release];
  </code></pre>