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