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))";
然后我尝试插入表中,这就是我遇到问题的地方。当我尝试更改“id”列时,收到一条错误消息“java.sql.SQLSyntaxErrorException:尝试修改标识列“ID”。”插入语句如下所示:
"insert into ParsonCollection values(" + q_surround(Name) + ","
+ q_surround(Eye) + "," + q_surround(Hair) + "," + q_surround(Height) + "," + q_surround(Weight) + ",1" + ")";
但是,当我删除插入“id”的字段时,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。 ”这个插入语句如下所示:
"insert into ParsonCollection values(" + q_surround(Name) + ","
+ q_surround(Eye) + "," + q_surround(Hair) + "," + q_surround(Height) + "," + q_surround(Weight) + ")";
我该如何克服这个问题?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。
最佳答案
您无法分配给标识列。由于无法传递所有值进行插入,因此需要枚举列(省略标识列):
"insert into ParsonCollection (
name,
eye,
hair,
height
weight
) values("
+ q_surround(Name)
+ "," + q_surround(Eye)
+ "," + q_surround(Hair)
+ "," + q_surround(Height)
+ "," + q_surround(Weight)
+ ")";
旁注:您的代码对 SQL 注入(inject)开放。您应该认真考虑使用准备好的语句和绑定(bind)参数,而不是连接查询字符串。
关于java - 使用 DB2 自动增量获取异常,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/59295186/