83 lines
3.9 KiB
Java
83 lines
3.9 KiB
Java
package finalexam.Database;
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import java.sql.Connection;
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import java.sql.DriverManager;
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import java.sql.PreparedStatement;
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import java.sql.ResultSet;
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import java.util.Scanner;
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public class ProductModificationAndDeletion {
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private static final String DBDRIVER = "com.mysql.cj.jdbc.Driver";
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private static final String DBURL = "jdbc:mysql://localhost:3306/xiaoshou?useUnicode=true&characterEncoding=utf-8&useSSL=false&serverTimezone=GMT";
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public static void main(String[] args) throws Exception {
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Class.forName(DBDRIVER);
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Connection conn = DriverManager.getConnection(DBURL);
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PreparedStatement pstmt = null;
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ResultSet rs = null;
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Scanner sc = new Scanner(System.in);
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int choice;
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do {
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System.out.println("====超市商品管理维护====");
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System.out.println("1、删除商品");
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System.out.println("2、修改商品");
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System.out.println("3、退出");
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System.out.print("请选择（1-3）：");
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choice = sc.nextInt();
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switch (choice) {
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case 1:
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System.out.print("输入商品编码：");
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String codeToDelete = sc.next();
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pstmt = conn.prepareStatement("SELECT * FROM t_shangping WHERE tiaoma = ?");
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pstmt.setString(1, codeToDelete);
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rs = pstmt.executeQuery();
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if (!rs.next()) {
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System.out.println("你输入的编码不存在，请重新输入");
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} else {
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pstmt = conn.prepareStatement("DELETE FROM t_shangping WHERE tiaoma = ?");
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pstmt.setString(1, codeToDelete);
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pstmt.executeUpdate();
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System.out.println("你成功删除该商品");
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}
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break;
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case 2:
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System.out.print("输入商品编码：");
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String codeToModify = sc.next();
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pstmt = conn.prepareStatement("SELECT * FROM t_shangping WHERE tiaoma = ?");
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pstmt.setString(1, codeToModify);
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rs = pstmt.executeQuery();
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if (!rs.next()) {
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System.out.println("你输入的编码不存在，请重新输入");
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} else {
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System.out.print("商品名称（" + rs.getString("mingcheng") + "）：");
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String name = sc.nextLine();
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sc.nextLine();
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System.out.print("商品单价（" + rs.getDouble("danjia") + "）：");
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double price = sc.nextDouble();
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sc.nextLine();
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System.out.print("商品供应商（" + rs.getString("gongyingshang") + "）：");
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String supplier = sc.nextLine();
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pstmt = conn.prepareStatement(
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"UPDATE t_shangping SET mingcheng = ?, danjia = ?, gongyingshang = ? WHERE tiaoma = ?");
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pstmt.setString(1, name.isEmpty() ? rs.getString("mingcheng") : name);
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pstmt.setDouble(2, price == 0.0 ? rs.getDouble("danjia") : price);
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pstmt.setString(3, supplier.isEmpty() ? rs.getString("gongyingshang") : supplier);
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pstmt.setString(4, codeToModify);
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pstmt.executeUpdate();
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System.out.println("成功修改该商品");
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}
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break;
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case 3:
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System.out.println("退出系统");
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break;
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default:
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System.out.println("无效的选择，请重新输入");
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break;
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}
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} while (choice != 3);
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rs.close();
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pstmt.close();
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conn.close();
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}
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}
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