mysql - Clob Blob 转化 String-优快云博客

本文详细介绍了如何在MySQL数据库中将Clob和Blob数据类型转换为String，包括Java编程中的处理方法，涵盖了读取、转换及存储过程中的关键步骤和示例代码。

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    String s1="1231dsdgasd的飒飒大";

         

        Clob c = new SerialClob(s1.toCharArray());//String 转 clob
        Blob b = new SerialBlob(s1.getBytes("GBK"));//String 转 blob
//      也可以这样不传字符集名称，默认使用系统的
//      Blob b = new SerialBlob(s1.getBytes());

         

        String clobString = c.getSubString(1, (int) c.length());//clob 转 String
        String blobString = new String(b.getBytes(1, (int) b.length()),"GBK");//blob 转 String
//      前面若没传入字符集名称，则这里也不需要传入，以免出错
//      String blobString = new String(b.getBytes(1, (int) b.length()));

         

        System.out.println(clobString);

        System.out.println(blobString);
 
 
  /**
     * Blob类型 转 String类型
     * @param blob
     * @return
      *import java.sql.Blob;
     */
    public static String blobToString(Blob blob){
        String result = "";
        if ( blob != null ){
            InputStream is;
            try {
                is = blob.getBinaryStream();
                ByteArrayInputStream bais = (ByteArrayInputStream)is;
                byte[] byte_data = new byte[bais.available()];
                bais.read(byte_data,0,byte_data.length);
                result = new String(byte_data,"utf-8");
                is.close();
            } catch (SQLException e) {
                e.printStackTrace();
            } catch (UnsupportedEncodingException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return result;
    }