java oracle clob string 大字符串存储【转】

单位用到了oracle存储string类型到数据库里的clob，上网查看资料找到解决方案。如下：

     public class ClobTest {  

         static String url = "jdbc:oracle:thin:@10.12.10.18:1521:orcl";
         static String user = "cwbe1_9999";
         static String pwd = "or777";
         static String text = "这是要插入到CLOB里面的数据,更新数据！" + "update";  

         private static int clobImport() throws ClassNotFoundException, SQLException {
             DriverManager.registerDriver(new OracleDriver());
             Connection conn = DriverManager.getConnection(url, user, pwd);// 得到连接对象
             String sql = "insert into ETLNEEDPARAM(F_KEY,F_VALUE) values ('defaultpo',?)";// 要执行的SQL语句
             PreparedStatement stmt = conn.prepareStatement(sql);// 加载SQL语句
             // PreparedStatement支持SQL带有问号？，可以动态替换？的内容。
             Reader clobReader = new StringReader(text); // 将 text转成流形式
             stmt.setCharacterStream(1, clobReader, text.length());// 替换sql语句中的？
             int num = stmt.executeUpdate();// 执行SQL
             if (num > 0) {
                 System.out.println("ok");
             } else {
                 System.out.println("NO");
             }
             stmt.close();
             conn.close();
             return num;
         }  

         private static int clobUpdate(String key) throws ClassNotFoundException, SQLException {  

             DriverManager.registerDriver(new OracleDriver());
             Connection conn = DriverManager.getConnection(url, user, pwd);// 得到连接对象
             String sql = "update ETLNEEDPARAM set F_VALUE = ? where F_KEY = ? ";// 要执行的SQL语句
             PreparedStatement stmt = conn.prepareStatement(sql);// 加载SQL语句
             // PreparedStatement支持SQL带有问号？，可以动态替换？的内容。
             Reader clobReader = new StringReader(text); // 将 text转成流形式
             stmt.setString(2, key);
             stmt.setCharacterStream(1, clobReader, text.length());// 替换sql语句中的？
             int num = stmt.executeUpdate();// 执行SQL
             if (num > 0) {
                 System.out.println("ok");
             } else {
                 System.out.println("NO");
             }
             stmt.close();
             conn.close();
             return num;
         }  

         private static String clobExport() throws ClassNotFoundException, SQLException, IOException {  

             CLOB clob = null;
             String sql = "select F_VALUE from ETLNEEDPARAM where F_KEY ='test1'";
             DriverManager.registerDriver(new OracleDriver());
             Connection conn = DriverManager.getConnection(url, user, pwd);// 得到连接对象
             PreparedStatement stmt = conn.prepareStatement(sql);
             ResultSet rs = stmt.executeQuery();
             String content = "";
             if (rs.next()) {
                 clob = (oracle.sql.CLOB) rs.getClob("F_VALUE"); // 获得CLOB字段str
                 // 注释： 用 rs.getString("str")无法得到 数据 ，返回的 是 NULL;
                 content = ClobToString(clob);
             }
             stmt.close();
             conn.close();
             return content;
         }  

         // 将字CLOB转成STRING类型  

         public static String ClobToString(CLOB clob) throws SQLException, IOException {
             String reString = "";
             Reader is = clob.getCharacterStream();// 得到流
             BufferedReader br = new BufferedReader(is);
             String s = br.readLine();
             StringBuffer sb = new StringBuffer();
             // 执行循环将字符串全部取出付值给StringBuffer由StringBuffer转成STRING
             while (s != null) {
                 sb.append(s);
                 s = br.readLine();
             }
             reString = sb.toString();
             return reString;
         }  

         public static void main(String[] args) throws IOException,ClassNotFoundException, SQLException {
             // System.out.println(clobImport());
             System.out.println(clobUpdate("fmo"));
             System.out.println(clobUpdate("epo"));  

             // System.out.println(clobExport());  

         }  

转自：http://bestxiaok.iteye.com/blog/1027733