如何使用 JDBC 更新 Oracle Clob

Question

正常方式如下：

    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();

这有点复杂，我不需要先阅读然后更新它。就像更新 varchar 一样。

Answer 1

不知道您为什么称其为“正常”方式，但以下内容对我有用。

在更新数据之前不需要对数据进行任何检索。

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();