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34 lines
1.3 KiB
34 lines
1.3 KiB
package javabean;
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import java.sql.Connection;
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import java.sql.PreparedStatement;
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import java.sql.ResultSet;
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import java.sql.SQLException;
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public class Reader {
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@SuppressWarnings("null")
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public String login(String user, String psw) throws ClassNotFoundException, SQLException {
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//检查用户名是否为空
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if (user == null || user.trim().equals("")) {
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return "账号不能为空";
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} else if (psw == null || psw.trim().equals("")) {//检查密码是否为空
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return "密码不能为空";
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}
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Connection connection = null; // 数据库连接对象
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PreparedStatement pstmt = null; // 预编译的SQL语句对象
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ResultSet resultSet = null; // 查询结果集对象
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String sql = "select * from borrow_card where ID=? and PASSWORD=?"; // SQL查询语句
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connection = Base.getConnection(); // 获取数据库连接
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pstmt = (PreparedStatement) connection.prepareStatement(sql); // 创建PreparedStatement对象
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pstmt.setString(1, user); // 设置第一个参数（用户名）
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pstmt.setString(2, psw); // 设置第二个参数（密码）
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resultSet = pstmt.executeQuery(); // 执行查询
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if (resultSet.next()) { // 如果查询有结果，说明账号密码正确
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return "1";
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}
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return "账号或密码错误"; // 如果没有查询到结果，返回错误信息
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}
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}
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