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  • 19時間前 -A ResultSet represents the table of data returned by a SELECT query. It maintains a cursor pointing to the current row,. initially positioned before the first ...

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    12時間前 -ConnectionEvent objects are generated when an application closes a pooled connection and when an error occurs. The ConnectionEvent object contains two kinds of ...

    14時間前 -A) the number of rows in the result set. B) the number of columns in the result set. C) the value of the cursor's current position

    9時間前 -The Senior Engineer had added indexes to support sorting, but the endpoint still requested pages hundreds of thousands of rows into the result set. The database ...

    A.ResultSetはnextを実行してから使います。 if (rs.next()) { out.println("# of data: " + rs.getInt(1)); }

    A.ResultSetはnextメソッドを実行することによってカーソルを(順方向に)進めることができます。 #カーソルの初期状態は最初のレコードのひとつ前です (例) Connection c...

    A.connection がDBとの接続 Statement は実行したいSQLを「コンパイル」するという役割です。 コンパイルされたSQLは使い回しが可能です。 コンパイルされたSQLは「exec...

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