Java 操作Oracle数据库Clob字段

 package com.cicc.dataloader;   /**  * @author fenglei  *  */ import java.io.BufferedReader; import java.io.CharArrayReader; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.PrintWriter; import java.io.StringReader;   import oracle.sql.CLOB;   import org.apache.poi.hssf.usermodel.HSSFCell; // cell import org.apache.poi.hssf.usermodel.HSSFRow; //row import org.apache.poi.hssf.usermodel.HSSFSheet; //sheet import org.apache.poi.hssf.usermodel.HSSFWorkbook; //excel import java.sql.*; import java.util.HashMap; import java.util.Iterator; import java.sql.Clob;   public class LoadRawData {   public final static String FILE_PATH = "E:\\data.xls";   public static void main(String[] args) { try {   LoadRawData.extractTeamData(FILE_PATH); } catch (Exception ex) { ex.printStackTrace(); } }        // team public static void extractTeamData(String fileName) throws Exception { FileInputStream fileInput = new FileInputStream(fileName); HSSFWorkbook wb = new HSSFWorkbook(fileInput); HSSFSheet sheet = wb.getSheet("PE_RAW_TEAM"); // name of sheet   int rowNum = sheet.getLastRowNum(); System.out.println("Total row number:" + rowNum); HSSFRow row = sheet.getRow(0); int columnNum = row.getLastCellNum(); System.out.println("Total column number:" + columnNum);   String allColumns = ""; String allValues = "";   String teamId = ""; String resume = ""; for (int i = 0; i <= rowNum; i++) { row = sheet.getRow(i);   if (i == 0) { // first line is column name StringBuffer sb = new StringBuffer(); for (int j = 0; j <= columnNum; j++) { HSSFCell cell = row.getCell(j);   String colName = getCellValue(cell); sb.append(colName + ",");   } allColumns = sb.toString().substring(0, sb.toString().length() - 2); // System.out.println("All columns:" + allColumns); // columns continue;   }   if (null != row && i > 0) { StringBuffer sb = new StringBuffer(); // System.out.println(""); for (int k = 0; k < columnNum; k++) { HSSFCell cell = row.getCell(k); String cellVal = getCellValue(cell);   if (k == 3 || k == 15) { // process // date // column if (!"".equals(cellVal.trim())) {   sb.append("to_date('1900-01-01','yyyy-mm-dd')+" + cellVal + "-2,"); } else { sb.append("'" + cellVal + "',"); } } // sb.append(cellVal + ","); else {   if (cellVal.contains("'")) { // special char cellVal = cellVal.replace("'", "||'''||'"); } if (k == 18) { resume = cellVal; cellVal = "empty_clob()"; // not process resume here sb.append(cellVal+","); continue; } if (k == 0) { teamId = cellVal; sb.append("?"+","); continue; } sb.append("'" + cellVal + "',"); } } allValues = sb.toString().substring(0, sb.toString().length() - 1); // System.out.println("All values:" + allValues); // values // string }  System.out.println("insert into PE_RAW_TEAM(" + allColumns + ",ID,CREATE_DATE,IS_ACTIVE" + ") values(" + allValues + ",companyseq.nextval,sysdate,1)"); String sqlStr = "insert into PE_RAW_TEAM(" + allColumns + ",ID,CREATE_DATE,IS_ACTIVE) values(" + allValues + ",companyseq.nextval,sysdate,1)";  // loadData(sqlStr); System.out.println("update teamId=" + teamId + "  resume"); insertClob(teamId, resume, sqlStr); }   fileInput.close(); }      public static boolean insertClob(String teamId, String strClob, String sql) { boolean suc = false; // CLOB使用的是oracle.sql.CLOB貌似JDBC接口的java.sql.Clob支持读入，但不支持写入Clob对象，Blob也是。。。 // 这里需要注意的是，在给HH调试bug的时候，它出的错误是，无法把oracle.sql.CLOB对象转换成oracle.sql.CLOB，因为它连接数据库是用 // 了Tomcat配置的数据源，所以在tomcat的common/lib目录下面有一个classes12.jar或者是ojdbc.jar，它的项目里面因为要引用oracle.sql.jar // 所以在项目lib目录下它也放了一个jar，这样造成了jar包之间的冲突，解决方法就是，将Web应用lib目录下的oracle驱动给移除掉（不是从构建路径上给 // remove掉，而是删除，如果remove不起作用，试过。。。）,然后外部引用common/lib目录下面的oracle驱动 CLOB clob = null; // 插入一个空的Clob对象，这是一个Cursor Connection conn = null; PreparedStatement ps = null; ResultSet rs = null;   try {   Class.forName("oracle.jdbc.driver.OracleDriver");   String url = "jdbc:oracle:thin:@192.168.142.43:1521:rawp"; String userName = "irkm"; String password = "irkm"; conn = DriverManager.getConnection(url, userName, password); // 禁用自动提交事务 conn.setAutoCommit(false); ps = conn.prepareStatement(sql); ps.setString(1, teamId); ps.executeUpdate(); ps.close();   // 查询并获得这个cursor,并且加锁 sql = "SELECT resume FROM pe_raw_team WHERE team_id=? for update"; ps = conn.prepareStatement(sql); ps.setString(1, teamId); rs = ps.executeQuery(); if (rs.next()) { clob = (CLOB) rs.getClob(1); }   // 获得clob对象的输出流 PrintWriter pw = new PrintWriter(clob.getCharacterOutputStream()); pw.write(strClob); // 一定要flush(),否则不会将String对象写入到Clob当中去。。。 pw.flush(); ps.close();   // 更新clob对象 sql = "UPDATE pe_raw_team set resume =? where team_id=?"; ps = conn.prepareStatement(sql); ps.setClob(1, clob); ps.setString(2, teamId); ps.executeUpdate(); ps.close(); conn.commit(); pw.close(); } catch (Exception e) { e.printStackTrace(); }   return suc; }      public static String getCellValue(HSSFCell cell) { String value = ""; if (null != cell) { switch (cell.getCellType()) { case HSSFCell.CELL_TYPE_NUMERIC: // numeric // System.out.println(cell.getNumericCellValue() + "   "); value = new Double(cell.getNumericCellValue()).toString(); break; case HSSFCell.CELL_TYPE_STRING: // string // System.out.println(cell.getStringCellValue() + "   "); value = cell.getStringCellValue(); break; case HSSFCell.CELL_TYPE_BOOLEAN: // Boolean // System.out.println(cell.getBooleanCellValue() + "   "); value = new Boolean(cell.getBooleanCellValue()).toString(); break; case HSSFCell.CELL_TYPE_FORMULA: // formula // System.out.println(cell.getCellFormula() + "   "); value = cell.getCellFormula(); break; case HSSFCell.CELL_TYPE_BLANK: // null // System.out.println(" "); value = ""; break; case HSSFCell.CELL_TYPE_ERROR: // error // System.out.println(" "); value = "error"; break; default: // System.out.println("n/a"); break; } } else { // System.out.println(""); return ""; } return value; }   }















   /**
      * 输出Clob对象
      * @param userid
      */
     public String readClob(String userid){
         String test_clob="";
         CLOB clob=null;
         StringBuffer sb=new StringBuffer();
         String sql="SELECT * FROM test_clob WHERE userid='"+userid+"'";
         try {
             ps=conn.prepareStatement(sql);
             rst=ps.executeQuery();
             if(rst.next()){
                 clob=(CLOB)rst.getClob(2);
             }
             Reader reader=clob.getCharacterStream();
             char[] buffer=new char[1024];
             int length=0;
             while((length=reader.read(buffer))!=-1){
                 sb.append(buffer, 0, length);
             }
         } catch (SQLException e) {
             e.printStackTrace();
         } catch (IOException e) {
             e.printStackTrace();
         }
         test_clob=sb.toString();
         return test_clob;
     }
     public static void main(String[] args){
         new ClobTest().inserClob("4","我是Clob，哈哈");
         String test=new ClobTest().readClob("4");
         System.out.println(test);
     }