| public static showRental ( int readerID, System.Windows.Forms.DataGridView dgvRental ) : void | ||
| readerID | int | |
| dgvRental | System.Windows.Forms.DataGridView | |
| Résultat | void | |
private void btnSearchReader_Click(object sender, EventArgs e)
{
if (txbReaderId.Text.Trim() == "")
{
MessageBox.Show("请输入读者编号");
}
else
{
int readerID = Convert.ToInt32(txbReaderId.Text);
Console.Out.WriteLine(readerID);
try
{
SqlCommand cmdReaderInfo = new SqlCommand("select * from Reader where id = " + readerID, Connection.Instance());
SqlDataReader recReaderInfo = cmdReaderInfo.ExecuteReader();
if (!recReaderInfo.HasRows)
{
MessageBox.Show("没有该用户！");
}
else
{
while (recReaderInfo.Read())
{
txbName.Text = recReaderInfo[1].ToString();
Console.Out.WriteLine(recReaderInfo[4]);
if (recReaderInfo[4] == null)
{
txbGender.Text = "不便透露";
}
else if (Convert.ToInt32(recReaderInfo[4]) == 0)
{
txbGender.Text = "女";
}
else
{
txbGender.Text = "男";
}
}
}
recReaderInfo.Close();
}
catch (Exception err)
{
MessageBox.Show(err.Message);
}
UserRental.showRental(readerID, dgvReaderBorrow);
}
}
private void button3_Click(object sender, EventArgs e) //这是借书的
{
if ((Convert.ToString(txbReaderId.Text.Trim())) == "")
{
MessageBox.Show("请输入读者编号！");
return;
}
if ((Convert.ToString(txbReaderId.Text.Trim())) == "")
{
MessageBox.Show("请输入图书编号");
return;
}
int readerId = Convert.ToInt32(txbReaderId.Text);
int bookId = Convert.ToInt32(textboxBookId.Text);
try
{
SqlCommand cmd = new SqlCommand("select * from Reader where id = " + readerId, Connection.Instance());
SqlDataReader recReader = cmd.ExecuteReader();
if (!recReader.HasRows)
{
recReader.Close();
MessageBox.Show("没有该用户！");
return;
}
recReader.Read();
int authory = Convert.ToInt32(recReader[11]);
recReader.Close();
SqlCommand cmdBookBorrowed = new SqlCommand("select * from borrowable_particular where particular_id = " + bookId, Connection.Instance());
SqlDataReader recBook = cmdBookBorrowed.ExecuteReader();
if (!recBook.HasRows)
{
recBook.Close();
MessageBox.Show("书籍已经被借");
return;
}
recBook.Close();
SqlCommand cmdGroup = new SqlCommand("select * from [group] where id = @authory", Connection.Instance());
cmdGroup.Parameters.Add("@authory", authory);
SqlDataReader recGroup = cmdGroup.ExecuteReader();
recGroup.Read();
int maxBorrowTime = Convert.ToInt32(recGroup[2]);
recGroup.Close();
DateTime nowTime = System.DateTime.Now;
DateTime oughtToReturn = System.DateTime.Now.AddDays(maxBorrowTime);
SqlCommand cmdRental = new SqlCommand("insert into rental(rent_time,due_time,particular_book_id,reader_id) values(@nowTime,@oughtToReturn,@bookId,@readerId)", Connection.Instance());
cmdRental.CommandText = "insert into rental(rent_time,due_time,particular_book_id,reader_id) values(@nowTime,@oughtToReturn,@bookId,@readerId)";
cmdRental.Parameters.Add("@nowTime", nowTime);
cmdRental.Parameters.Add("@oughtToReturn", SqlDbType.DateTime, 8, "due_time");
cmdRental.Parameters["@oughtToReturn"].Value = oughtToReturn;
cmdRental.Parameters.Add("@bookId", SqlDbType.Int, 4, "particular_book_id");
cmdRental.Parameters["@bookId"].Value = bookId;
cmdRental.Parameters.Add("@readerId", SqlDbType.Int, 4, "reader_id");
cmdRental.Parameters["@readerId"].Value = readerId;
cmdRental.ExecuteNonQuery();
UserRental.showRental(readerId, dgvReaderBorrow);
MessageBox.Show("借书成功！");
}
catch (Exception err)
{
MessageBox.Show(err.Message);
}
}
private void button2_Click(object sender, EventArgs e) //这是还书的
{
if (textboxBookId.Text.ToString() == "")
{
MessageBox.Show("请输入还书编号");
return;
}//如果还书编号为空，弹出提示
else
{
int bookId = Convert.ToInt32(textboxBookId.Text); //因为还书只需要书籍编号，所以我只获取了图书编号
//先把rental表中该书的return time填上。
// SqlCommand cmdReturn = new SqlCommand("select * from rental where particular_book_id=" + bookId, Connection.Instance());
//
DateTime returnTime = System.DateTime.Now;
String update = "update rental set return_time='" + returnTime + "' where particular_book_id='" + bookId + "' and return_time is null";
SqlCommand cmdReturn = new SqlCommand(update, Connection.Instance());
SqlDataReader drReturn = cmdReturn.ExecuteReader();
drReturn.Close();
// 走到这一步，把rental表中的return_time填上了
//，接下来就要看看有谁预约了这本书,因为预约中的书是用isbn表示，
//而还书的书籍编号是用ID，所以要多一步，在book表中换成ID对应的isbn
String getBookisbn = "select * from particular_book where id = " + bookId;
SqlCommand cmdFindIsbn = new SqlCommand(getBookisbn, Connection.Instance());
SqlDataReader drFindIsbn = cmdFindIsbn.ExecuteReader();
drFindIsbn.Read();
String theIsbn = drFindIsbn[2].ToString(); //找出该id的isbn
drFindIsbn.Close();
String ifOrder = "";
String findReserve = "select * from reserve where book_isbn='" + theIsbn + "'";
SqlCommand cmdFindReserve = new SqlCommand(findReserve, Connection.Instance());
SqlDataReader drFindReserve = cmdFindReserve.ExecuteReader();
if (!drFindReserve.HasRows)
{
drFindReserve.Close();
ifOrder = "没有人预约了这本书";
}
else
{
do
{
if (drFindReserve.Read())
{
continue;
}
else
{
ifOrder = "no valid one has reserved";
break; //当当前已经到了最后一列，说明所有预约者的借书卡都无效了（不过可能性有点小也）
}
}while (Convert.ToUInt32(drFindReserve[4]) == 0); //此读者的借书卡无效，接着找下一个人
if (ifOrder != "no valid one has reserved")
{
ifOrder = "studentId:" + drFindReserve[1].ToString() + "has reserved it";
}
MessageBox.Show(ifOrder);
}
drFindReserve.Close();
//在预约读者中找出有没有人预约此书
if (txbReaderId.Text != "")
{
UserRental.showRental(Convert.ToInt32(txbReaderId.Text), dgvReaderBorrow);
}
MessageBox.Show("还书成功！");
}
}