tables.py 文件源码

def deleteValue(self,name):
        '''
        Delete a value with name name.
        '''
        # clean up names to avoid stupid
        debug.add('deleting value ',name)
        # figure out the path to the named value file
        if name in self.names:
            filePath=self.namePaths[name]
            # remove the metadata entry
            del self.namePaths[name]
            # write changes to database metadata file
            writeFile(pathJoin(self.path,'names.table'),pickle(self.namePaths))
            # update the length and names attributes
            self.names=self.namePaths.keys()
            self.length=len(self.names)
        else:
            return False
        if pathExists(filePath):
            # remove the file accocated with the value
            removeFile(filePath)
            return True
        else:
            return False
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