如何使用JDBC更新Oracle Clob

Question

正常方式如下所示：

    pStmt = conn.prepareStatement("SELECT DETAILS FROM PROGRAM_HISTORY WHERE id = 12");
    rset = pStmt.executeQuery();
    Clob detailsClob= rset.getClob(1);
    Writer writer = adapter.getCharacterOutputStream(detailsClob);
    writer.write("add more details"); 

    pStmt = conn.prepareStatement("UPDATE PROGRAM_HISTORY SET DETAILS = ? WHERE ID = 12");
    pStmt.setClob(1, detailsClob);
    pStmt.execute();

這有點復雜，是我不需要先閱讀然后進行更新的任何方式。 就像更新varchar一樣。

Answer 1

不知道為什么您稱其為“正常”方式，但以下內容對我有用。

在更新數據之前，不需要任何數據檢索。

String value = "So long and thanks for all the fish";
StringReader reader = new StringReader(value);
pStmt = conn.prepareStatement("UPDATE PROGRAM_HISTORY SET DETAILS = ? WHERE ID = 12");
pStmt.setCharacterStream(1, reader, value.length());
pStmt.executeUpdate();