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user3.cs
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user3.cs
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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace BookManagementSystem
{
public partial class User3 : Form
{
public User3()
{
InitializeComponent();
}
private void User3_Load(object sender, EventArgs e)
{
Table();
}
// 从数据库读取数据显示在表格控件中
public void Table()
{
// 把控件中的旧数据清空
dataGridView1.Rows.Clear();
Dao dao = new Dao();
string sql =
$"SELECT * " +
$"FROM " +
$"v_lend " +
$"WHERE " +
$"[uid] = '{Data.UID}'";
IDataReader dc = dao.Read(sql);
while (dc.Read())
{
dataGridView1.Rows.Add(
dc[0].ToString(),
dc[1].ToString(),
dc[2].ToString(),
dc[3].ToString(),
dc[4].ToString(),
dc[5].ToString(),
dc[6].ToString()
);
}
label1.Text = "已借图书数量:" + dataGridView1.Rows.Count.ToString();
dc.Close();
dao.DaoClose();
}
// 归还
private void button1_Click(object sender, EventArgs e)
{
string no = dataGridView1.SelectedRows[0].Cells[0].Value.ToString();
string id = dataGridView1.SelectedRows[0].Cells[2].Value.ToString();
string sql =
$"DELETE FROM t_lend " +
$"WHERE [no] = {no}; " +
$"UPDATE t_book " +
$"SET " +
$"number = number + 1 " +
$"WHERE " +
$"id = '{id}'";
Dao dao = new Dao();
if (1 < dao.Execute(sql))
{
MessageBox.Show("归还成功");
Table();
}
}
}
}