我无法删除 mysql table 中的所有行

Question

您好，我想删除名为 "kosik" 的 mysql table 中的所有行，并将它们传递给另一个名为 "obj_zoznam" 的 table。

我在 java 中使用此代码：

String orderstatus = "Accepted";
        try {
            stmt = con.createStatement();
            stmt2 = con.createStatement();
            stmt3 = con.createStatement();

            rs = stmt.executeQuery("select ID as idzaz, ID_pouzivatela as idpou, ID_tovaru as idtov, cena as suma, ks as kusy from kosik order by ID limit 1");

            while (rs.next()) {

                int zaz = rs.getInt("idzaz");
                int pou = rs.getInt("idpou");
                int tov = rs.getInt("idtov");
                int suma = rs.getInt("suma");
                int kusy = rs.getInt("kusy");

                String sstr = "insert into obj_zoznam (ID_pouzivatela, ID_tovaru, suma, ks, stav) values ("
                        + "'" + id_usera + "', "
                        + "'" + tov + "', "
                        + "'" + suma + "', "
                        + "'" + kusy + "', "
                        + "'" + orderstatus + "')";

                String sstr2 = "delete from kosik where ID = " + zaz;

                stmt2.executeUpdate(sstr);
                stmt3.executeUpdate(sstr2);
            }

            stmt.close();
            stmt2.close();
            stmt3.close();
        } catch (Exception e) {
            out.println("Error in writing: " + e.toString());
        }

但是此代码总是只从 table "kosik" 中删除一条记录。我想知道如何删除此 table.

中的所有记录

谁能告诉我我做错了什么？我将不胜感激。

谢谢。

Answer 1

I'm trying to figure how to delete all records in this table.

然后从您的 delete 语句中删除该过滤器 where 条件

delete from kosik

Answer 2

从您的 SELECT 中删除 LIMIT 1，这样您就可以调出所有记录，而不仅仅是 1 条。这一行：

rs = stmt.executeQuery("select ID as idzaz, ID_pouzivatela as idpou, ID_tovaru as idtov, cena as suma, ks as kusy from kosik order by ID limit 1");

取消限制1：

rs = stmt.executeQuery("select ID as idzaz, ID_pouzivatela as idpou, ID_tovaru as idtov, cena as suma, ks as kusy from kosik order by ID");

请勿从 DELETE 中删除 WHERE 否则您将 select 1 条记录 (stmt)，将其插入另一条 table ( stmt2) 然后清除所有 table，然后再将所有其他记录插入 obj_zoznam (stmt3).

Answer 3

您将查询结果限制为一行，因此您始终只有一个 ID。 sstr2 的执行将始终删除第一个 id

的记录

Answer 4

如果要删除保留 table 结构的条目，使用 truncate 命令应该可以。

truncate table kosik

我无法删除 mysql table 中的所有行

I'm not able to delete all rows in mysql table

java

mysql

servlets

resultset

try-catch