我想使用preparedstatement创建自动增量id,我正在使用oracle数据库,这是我的代码
public Client newClient(Client client){
try {
con = DBConnection.getConnection(driver, url, name, pass);
pstmt = con.prepareStatement("INSERT INTO CLIENT (FIRSTNAME, LASTNAME, CAREER, CSALARY) VALUES (?, ?, ?, ?)", Statement.RETURN_GENERATED_KEYS);
pstmt.setString(1, client.getFirstName());
pstmt.setString(2, client.getLastName());
pstmt.setString(3, client.getCareer());
pstmt.setInt(4, client.getcSalary());
pstmt.executeUpdate();
rs = pstmt.getGeneratedKeys();
rs.next();
int id = rs.getInt(1);
client.setcId(id);
}catch(Exception ex){
ex.printStackTrace();
return null;
}finally{
try{ rs.close(); }catch (Exception e){}
try{ pstmt.close();}catch (Exception e){}
try{ con.close();}catch (Exception e){}
}//finally
return client;
}`
但我有这个错误
java.sql.SQLException: ORA-01400: cannot insert NULL into ("AHMAD"."CLIENT"."CID")
请帮助我
最佳答案
听起来你需要一个 autonumber sequence
To retrieve the next value in the sequence order, you need to use nextval.
For example:
supplier_seq.nextval
这将为您的INSERT
提供自动增量序列ID(即您只需执行INSERT
,数据库将插入自动增量值)
关于java - 在preparedstatement中创建自动增量id,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/19244373/