小编典典

如何使用JDBC更新Oracle Clob

sql

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();

这有点复杂,是我不需要先阅读然后进行更新的任何方式。就像更新varchar一样。


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2021-03-17

共1个答案

小编典典

不知道为什么将其称为“正常”方式,但以下内容对我有用。

在更新数据之前,不需要任何数据检索。

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();
2021-03-17