Question

我对last_insert_rowid()有疑问。它总是返回0.

String query = "SELECT last_insert_rowid() AS LAST FROM UGYFEL";
PreparedStatement pst1 = connection.prepareStatement(query);
ResultSet  rs1 = pst1.executeQuery();
JOptionPane.showMessageDialog(null, rs1.getString("LAST"));
pst1.execute();

//JOptionPane.showMessageDialog(null, "Adat elmentve");

pst1.close();
rs1.close();

Answer 1

如果在您执行上一次插入的同一个打开连接上调用函数last_insert_rowid()，则返回有效行ID（行ID大于0）。您可以使用相同的连接解决此问题，或者如果您只想从max获取UGYFEL ID，则可以像这样获取

SELECT MAX(YOUR_ID_COL_NAME) AS LAST FROM UGYFEL

Answer 2

所以工作正常。正确的吗？

                String query = "SELECT MAX(ID) AS LAST FROM UGYFEL";
                PreparedStatement pst1 = connection.prepareStatement(query);
                ResultSet  rs1 = pst1.executeQuery();
                String maxId=  rs1.getString("LAST");
                //Max Table Id Convert to Integer and +1
                int intMaxId =(Integer.parseInt(maxId))+1;
                //Convert to String
                String stringMaxId = Integer.toString(intMaxId);
                tUazon.setText(stringMaxId);
                pst1.execute();

                //JOptionPane.showMessageDialog(null, "Adat elmentve");

                pst1.close();
                rs1.close();

Java sqlite last_insert_rowid（）返回0

2 个答案: