thinkphp Field Mappings related issues

thinkphp Field Mapping issues
Class Projectaction extends action{
Protected $_map = Array (
' username ' + ' user ',//username map in the form 刡 the user field of the data table
' Password ' = ' pwd ',//password mapping in the form 刡 the PWD field of the datasheet
);

Public Function Insert () {
$Project = D (' Project ');
if ($Project->create ()) {
echo "Create data object successfully!" ";
if ($Project->add ()) {
Echo ' Add data success ';
}else {
Echo ' Add data failed ';
}
}else{
Echo ' failed to create data object ';
}

}

}

Insert the form data into the table, the execution of the Insert function, the data object creation failed, ask you what is the problem?
------Solution--------------------
Paste the contents of the Model project file

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