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例 12-7 include() と return() 文
when a file is include() ed, the code it contains inherits the variable scope of the line on which the include() occurs. any variables available at that line in the calling file will be available within the called file. if the include() occurs inside a function within the calling file, then all of the code contained in the called file will behave as though it had been defined inside that function.
ocicolumnisnull() は、 文 stmt の結果として返されたカラムが null である 場合に true を返します。 column パラメータに(1から始まる)カラム番号または カラム名のどちらかを使用可能です。
ocicolumnisnull() 함수는 구문 stmt 의 결과값에서 리턴된 컬럼 column 값이 널( null )이면 true 를 리턴한다. col 인수를 위해 컬럼 숫자(column-number(1-based))나 컬럼 이름(column-name)을 사용할 수 있다.