src/Database/Schemas/MysqlSchema.php
public function notnull()
    {
        $i = Collection::count(self::$colmuns) - 1;
        self::$colmuns[$i] .= ' not null';
        //
        return $this;
    }
public function notnull()
    {
        $i = Collection::count(self::$colmuns) - 1;
        self::$colmuns[$i] .= ' not null';
        //
        return $this;
    }
public function notnull ( ) { $ i = Collection :: count ( self :: $ colmuns ) - 1 ; self :: $ colmuns [ $ i ] .= ' not null' ; // return $ this ; }
function to add not null constraint.

@return schema
function to add not null constraint .