利用Stripes、Apache Derby和Eclipse进行无配置的J2EE开发（二） - 编程入门网
作者 佚名技术
来源 NET编程
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发布时间 2012-06-17
| lientDriver"; private static final String database = "jdbc:derby://localhost:1527/glossary;"; private static MyGlossaryTerm instance; public static MyGlossaryTerm getInstance() { if (instance == null) { instance = new MyGlossaryTerm(); } return instance; } private Connection getConnection() { Connection connection = null; try { Class.forName(driver).newInstance(); Properties props = new Properties(); props.put("user", "sa"); props.put("password", "sa"); connection = DriverManager.getConnection(database, props); } catch (Exception ex) { log.error("Error connecting to database: " + database, ex); throw new RuntimeException("Database " + database + " is not available.", ex); } return connection; } public String resultSetSize() { String resultSize = ""; Connection conn = getConnection(); Statement s = null; ResultSet rs = null; try { conn = getConnection(); s = conn.createStatement(); rs = s .executeQuery("SELECT COUNT(TERM_ID) AS TOTAL FROM APP.GLOSSARY"); while (rs.next()) { resultSize = rs.getString("TOTAL"); } } catch (Exception ex) { log.error("Really bad database error.", ex); } finally { try { rs.close(); s.close(); conn.commit(); conn.close(); } catch (SQLException e) { log.error("More really bad database errors.", e); } } return resultSize; } public Term getSingleTerm(int id) { Term term = new Term(); Connection conn = getConnection(); Statement s = null; ResultSet rs = null; try { conn = getConnection(); s = conn.createStatement(); rs = s.executeQuery("SELECT * FROM APP.GLOSSARY WHERE TERM_ID = " + id); while (rs.next()) { term.setId(rs.getInt("TERM_ID")); term.setTerm(rs.getString("TERM")); term.setDefinition(rs.getString("DEFINITION")); } } catch (Exception ex) { log.error("Really bad database error.", ex); } finally { try { rs.close(); s.close(); conn.commit(); |
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