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14-9. How Do You Close ResultSet, Statement, and Connection Objects Together
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The following utility method closes ResultSet, Statement, and Connection objects where Statement is derived from the Connection object and ResultSet is derived from the Statement object.
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Closing ResultSet, Statement, and Connection Objects and Ignoring Exceptions
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This shows how to close ResultSet, Statement, and Connection objects and ignore exceptions: /** * Close ResultSet, Statement, and Connection objects. * @param rs a ResultSet object (derived from stmt object) * @param stmt a Statement object (derived from conn object) * @param conn a Connection object */ public static void closeQuietly(ResultSet rs, Statement stmt, Connection conn) { if (rs != null) { try {
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CHAPTER 14 EXPLORING JDBC UTILITIES
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// close the statement rs.close(); } catch (Exception ignored1) { } } if (stmt != null) { try { // close the statement stmt.close(); } catch (Exception ignored2) { } } if (conn != null) { try { // close the connection if (!conn.isClosed()) { conn.close(); } } catch (Exception ignored3) { } } }
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Closing ResultSet, Statement, and Connection Objects and Reporting Exceptions
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This shows how to close ResultSet, Statement, and Connection objects and report exceptions: /** * Close ResultSet, Statement, and Connection objects. * @param rs a ResultSet object (derived from stmt object) * @param stmt a Statement object (derived from conn object) * @param conn a Connection object * @throws SQLException failed to close statement and connection. */ public static void close(ResultSet rs, Statement stmt, Connection conn) throws SQLException { if (rs != null) { // close the result set rs.close(); } if (stmt != null) { // close the statement stmt.close(); } if (conn != null) { // close the connection if (!conn.isClosed()) { conn.close(); } } }
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CHAPTER 14 EXPLORING JDBC UTILITIES
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14-10. How Do You Return a Long Text Column/Field from a Database
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The following utility can apply to a long column/field such as a CLOB or LongVarChar data type.
Returning a Larger Text Column/Field Using a Column Index
This shows how to return a larger text column/field using a column index: /** * Return a larger text field from the database. * @param rs a ResultSet object * @param columnIndex index column of a long column/field * @return a larger text field from the database. * @throws SQLException failed to get a long string field/column. */ public static String getLargerString(ResultSet rs, int columnIndex) throws SQLException { if ((rs == null) || (columnIndex < 1)) { return null; } // buffer size when reading long strings InputStream in = null; int BUFFER_SIZE = 1024; try { // retrieves the value of the designated column in the // current row of this ResultSet object as a stream of // ASCII characters. The value can then be read in chunks // from the stream. This method is particularly suitable // for retrieving large LONGVARCHAR values. The JDBC driver // will do any necessary conversion from the database // format into ASCII in = rs.getAsciiStream(columnIndex); if (in == null) { return ""; } byte[] arr = new byte[BUFFER_SIZE]; StringBuffer buffer = new StringBuffer(); int numRead = in.read(arr); while (numRead != -1) { buffer.append(new String(arr, 0, numRead)); numRead = in.read(arr); } return buffer.toString(); } catch (Exception e) { e.printStackTrace(); throw new SQLException(e.getMessage()); } }
Returning a Larger Text Column/Field Using a Column Name
This shows how to return a larger text column/field using a column name:
CHAPTER 14 EXPLORING JDBC UTILITIES
/** * Return a larger text field from the database. * @param rs a ResultSet object * @param columnName name of column a long column/field * @return a long text field from the database. * @throws SQLException failed to get a long string field/column. */ public static String getLargerString(ResultSet rs, String columnName) throws SQLException { if ((rs == null) || (columnName == null)) { return null; } // buffer size when reading long strings InputStream stream = null; int BUFFER_SIZE = 1024; try { // retrieves the value of the designated column in the // current row of this ResultSet object as a stream of // ASCII characters. The value can then be read in chunks // from the stream. This method is particularly suitable // for retrieving large LONGVARCHAR values. The JDBC driver // will do any necessary conversion from the database // format into ASCII stream = rs.getAsciiStream(columnName); if (stream == null) { return ""; } byte[] arr = new byte[BUFFER_SIZE]; StringBuffer buffer = new StringBuffer(); int numRead = stream.read(arr); while (numRead != -1) { buffer.append(new String(arr, 0, numRead)); numRead = stream.read(arr); } return buffer.toString(); } catch (Exception e) { e.printStackTrace(); throw new SQLException(e.getMessage()); } }
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