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Oracle Blob/Clob 字段寫入時產生轉型異常Cast Exception

CLOB clob = (CLOB)us.getStatisticsInfo();

原因是
java.sql.Blob不能強制傳喚成oracle.sql.BLOB

解決方法如下：

SerializableClob lob=(SerializableClob)us.getStatisticsInfo();
CLOB lob2 = (CLOB)lob.getWrappedClob();
Writer out = lob2.getCharacterOutputStream();

public void testAdd() throws Exception {

byte[] buffer = new byte[1];

buffer[0] = 1;

Session s = null;

try {

s = sf.openSession();

Transaction tx = s.beginTransaction();

BizUserStatistics us= new BizUserStatistics();

us.setId(new Long(100));

us.setStatisticsInfo(Hibernate.createClob(" "));

s.save(us);

s.flush();

s.refresh(us, LockMode.UPGRADE);

// CLOB clob = (CLOB)us.getStatisticsInfo();

SerializableClob lob=(SerializableClob)us.getStatisticsInfo();

CLOB lob2 = (CLOB)lob.getWrappedClob();

Writer out = lob2.getCharacterOutputStream();

String fileName = "d:/process_log.sql";

File f = new File(fileName);

FileInputStream fin = new FileInputStream(f);

StringBuffer sb = new StringBuffer();

for (int i = 0; i < 1000; i++){

sb.append("<data>" + i + "</data>");

}

out.write(sb.toString());

out.close();

s.flush();

tx.commit();

} catch (Exception e) {

e.printStackTrace();

} finally {

if (s != null)

try {

s.close();

} catch (Exception e){}

}

方向:分布式系統設計

posted on 2006-02-14 16:35 java光環閱讀(1240) 評論(0) 編輯收藏所屬分類: hibernate

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相關文章: Oracle Blob/Clob 字段寫入時產生轉型異常Cast Exception WARN afterTransactionCompletion() was never called hibernate ant Hbm2JavaTask Exception of:org.xml.sax.SAXParseException: Attribute "insert" must be declared for element type "discriminator". hiberante persistence 關于cascade 與inverse

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Oracle Blob/Clob 字段寫入時產生轉型異常Cast Exception