3

是否可以在不重新读取和重写整个内容的情况下将文本附加到 oracle 9i clob？

我试过这个：

PreparedStatement stmt = cnt.prepareStatement(
        "select OUT from QRTZ_JOBEXEC where EXEC_ID=? "
            + "for update",
        ResultSet.TYPE_FORWARD_ONLY,
        ResultSet.CONCUR_UPDATABLE);
try {
    stmt.setLong(1, id);
    ResultSet rs = stmt.executeQuery();
    if (rs.next()) {
        Clob clob = rs.getClob(1);
        long len = clob.length();
        Writer writer = clob.setCharacterStream(len+1);
        try {
            PrintWriter out = new PrintWriter(writer);
            out.println(line);
            out.close();
        } finally {
            writer.close();
        }
        rs.updateClob(1, clob);
        rs.updateRow();
    }
    rs.close();
} finally {
    stmt.close();
}

但是我在调​​用 setCharacterStream 时遇到“不支持的功能”异常。

4

2 回答 2

6

DBMS_LOB.APPEND是关键。

于 2011-07-29T07:54:18.397 回答
1

如果您只是添加文本，那么您可以尝试一个简单的

UPDATE qrtz_jobexec SET out = out || ? WHERE exex_id=?
于 2011-07-29T07:17:30.533 回答