Java 使用DB2自动增量获取异常

我创建了下表：

"CREATE TABLE ParsonCollection "
                + "(id integer not null GENERATED ALWAYS AS IDENTITY (START WITH 1, INCREMENT BY 1),"
                + "name varchar(20),"
                + "eye varchar(20),"
                + "hair varchar(20),"
                + "height varchar(20),"
                + "weight varchar(20),"
                + "PRIMARY KEY (id))";

然后我尝试插入到表中，这就是我遇到问题的地方。当我尝试更改“id”列时，会出现一个错误，提示“java.sql.SQLSyntaxErrorException:尝试修改标识列“id”。”insert语句如下所示：

"insert into ParsonCollection values(" + q_surround(Name) + ","
            + q_surround(Eye) + "," + q_surround(Hair) + "," + q_surround(Height) + "," + q_surround(Weight) + ",1" + ")";

"insert into ParsonCollection values(" + q_surround(Name) + ","
            + q_surround(Eye) + "," + q_surround(Hair) + "," + q_surround(Height) + "," + q_surround(Weight) + ")";

但是，当我去掉插入到“id”中的字段时，会出现以下错误：“java.sql.SQLSyntaxErrorException:分配的值的数量与指定或隐含列的数量不同。”下面是此insert语句的外观：

"insert into ParsonCollection values(" + q_surround(Name) + ","
            + q_surround(Eye) + "," + q_surround(Hair) + "," + q_surround(Height) + "," + q_surround(Weight) + ",1" + ")";

"insert into ParsonCollection values(" + q_surround(Name) + ","
            + q_surround(Eye) + "," + q_surround(Hair) + "," + q_surround(Height) + "," + q_surround(Weight) + ")";

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我该怎么过这关？似乎当我解决一个异常时，会弹出另一个异常，反之亦然。谢谢。

您不能分配给标识列。由于无法为insert传递所有值，因此需要枚举列（忽略标识列）：

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旁注：您的代码是对SQL注入打开的。您应该认真考虑使用准备语句和绑定参数，而不是连接查询字符串。

< P>出于兴趣，另一种解决方案是使身份栏<代码>隐式隐藏< /代码>

。请注意，您正在进行的字符串连接容易受到SQL注入的攻击。虽然它不能解决您当前的问题，但您应该使用一个预先准备好的语句。什么，对SQL注入漏洞不发表评论？@Clockwork Muse:您肯定是对的。我的回答中增加了警告。谢谢你，这起作用了。顺便说一句，我之所以不使用预先准备好的陈述，是因为我的教授不允许我们使用，而且他也没有教我们。