private void 借书ToolStripMenuItem_Click(object sender, EventArgs e)
{
if (!check_is_binded(username))
{
MessageBox.Show("您还未绑定身份，不能使用该功能！");
}
else
{
if (get_user_borrowed_num(username) == "5")
{
MessageBox.Show("您已经借了5本书，达到上限");
}
else if (dataGridView1.SelectedRows.Count > 0)
{
MessageBoxButtons messButton = MessageBoxButtons.OKCancel;
DialogResult dr = MessageBox.Show("确定要借这本书吗?", "确定", messButton);
if (dr == DialogResult.OK)
{
if (!check_book_user_exist(username, dataGridView1.SelectedRows[0].Cells["BookNum"].Value.ToString()))
{
string sql = "insert into ordertable(UserName,OrderNum,OrderBookName)values( ";
sql += "'" + username + "',";
sql += "'" + dataGridView1.SelectedRows[0].Cells["BookNum"].Value.ToString() + "',";
sql += "'" + dataGridView1.SelectedRows[0].Cells["BookName"].Value.ToString() + "')";
string sql2 = "update [User] set Number = Number +1 where UserName = "******"'" + username + "'";
try
{
SQLServer.ExecuteNonQuery(sql);
MessageBox.Show("借书成功！");
load_data();
SQLServer.ExecuteNonQuery(sql2);
FormUserBorrowedBooks formBorrowedBooks = new FormUserBorrowedBooks(username);
Visible = false;
formBorrowedBooks.ShowDialog();
Visible = true;
}
catch (Exception ex)
{
MessageBox.Show("借书失败");
Console.WriteLine(ex);
}
}
else
{
MessageBox.Show("您已经借过这本书");
}
}
}
}
}
private void 已借书目ToolStripMenuItem_Click(object sender, EventArgs e)
{
if (!check_is_binded(username))
{
MessageBox.Show("您还未绑定身份，不能使用该功能！");
}
else
{
FormUserBorrowedBooks formUserBorrowedBooks = new FormUserBorrowedBooks(username);
Visible = false;
formUserBorrowedBooks.ShowDialog();
Visible = true;
}
}
