使用setString（）从String转换为Clob不起作用 [英] Converting from String to Clob using setString() not working

问题描述

我正在尝试将String转换为Clob以存储在数据库中。我有以下代码：

I am trying to convert a String into a Clob to store in a database. I have the following code:

Clob clob = connection.createClob();
System.out.println("clob before setting: " + clob);
clob.setString(1,"Test string" );
System.out.println("clob after setting: " + clob);
System.out.println("clob back to string: " + clob.toString());

当我运行此Clob未设置时，输出如下：

When I run this the Clob is not being set, the output is as follows:

clob before setting: org.apache.derby.impl.jdbc.EmbedClob@1f5483e
clob after setting: org.apache.derby.impl.jdbc.EmbedClob@1f5483e
clob back to string: org.apache.derby.impl.jdbc.EmbedClob@1f5483e

无处不在我说要使用setString方法，我不知道为什么这对我不起作用。

Everywhere I look says to use the setString method, I have no idea why this isn't working for me.

推荐答案

您不需要中间 Clob 实例，只需使用 setString（）即可的PreparedStatement ：

You don't need the intermediate Clob instance, just use setString() on the PreparedStatement:

PreparedStatement stmt = connection.prepareStatement("insert into clob_table (id, clob_column) values (?,?)";
stmt.setInt(1, 42);
stmt.setString(2, "This is the CLOB");
stmt.executeUpdate();
connection.commit();

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