loanm.cs

用C#与SQL2005写的一个简单的图书管理系统.主要功能:图书及学生信息的添加修改与删除 图书的借出与归还 图书信息的模糊查询.

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Data.SqlClient;

namespace BooksM.SystemInforQuery
{
    public partial class LoanM : Form
    {
        public LoanM()
        {
            InitializeComponent();
        }

        private void LoanM_Load(object sender, EventArgs e)
        {
            textBox4.Text = DateTime.Now.ToString();
        }

        private void button3_Click(object sender, EventArgs e)
        {
            if (textBox1.Text.Trim().Length == 0)
            {
                MessageBox.Show("输入的读者编号不能为空！", "提示");
                textBox1.Focus();
                return;
            }
            if (textBox2.Text.Trim().Length == 0)
            {
                MessageBox.Show("输入的图书编号不能为空！", "提示");
                textBox2.Focus();
                return;
            }
            MyClass.ConnData myConnData = new BooksM.MyClass.ConnData();
            SqlCommand mySqlCommand = new SqlCommand(@" 
                                                       select *
                                                       from ReaderInfor", myConnData.ConnectDB());
            SqlDataReader myDataReader = mySqlCommand.ExecuteReader();
            while (myDataReader.Read())
            {
                if (myDataReader.GetValue(0).ToString().Trim() == textBox1.Text.ToString().Trim())
                {
                        SqlCommand mySqlCommand1= new SqlCommand(@" 
                                                                   select *
                                                                   from BookCardInfor", myConnData.ConnectDB());
                        SqlDataReader myDataReader1 = mySqlCommand1.ExecuteReader();
                        while (myDataReader1.Read())
                        {
                            if (myDataReader1.GetValue(0).ToString().Trim() == textBox2.Text.ToString().Trim())
                            {
                                MessageBox.Show("此读者和图书均存在！");
                                return;
                            }
                            else
                            {
                                continue;
                            }
                        }
                        MessageBox.Show("此读者存在！图书不存在！");                    
                    return;
                }
                else
                {
                    continue;
                }
            }
            MessageBox.Show("此用读者不存在！");
            textBox1.Text = Convert.ToString(Convert.ToInt32(textBox1.Text.Trim()) + 1);
            textBox2.Text = Convert.ToString(Convert.ToInt32(textBox2.Text.Trim()) + 1);
            textBox3.Text = "";
            return;
        }

        private void button1_Click(object sender, EventArgs e)
        {
            if (textBox1.Text.Trim().Length == 0)
            {
                MessageBox.Show("输入的读者编号不能为空！", "提示");
                textBox1.Focus();
                return;
            }
            MyClass.ConnData myConnData = new BooksM.MyClass.ConnData();
            if (textBox2.Text.Trim().Length == 0)
            {
                MessageBox.Show("输入的图书编号不能为空！", "提示");
                textBox3.Focus();
                return;
            }
                string str1 = "update BookCardInfor set "
                 + "ActualNum=ActualNum-"
                + Convert.ToInt32(textBox3.Text.Trim())
                + ",LoanNum=LoanNum+"
                + Convert.ToInt32(textBox3.Text.Trim())
                + " where BookID='" + textBox2.Text.ToString().Trim() + "'";
                try
                {
                    if (myConnData.Command(str1))
                        MessageBox.Show("借书成功！");
                }
                catch
                {
                    MessageBox.Show("借书失败！");
                    return;
                }
            string temp = "exec LoanInfor_Insert '"
                + textBox1.Text.ToString().Trim() + "','"
                + textBox2.Text.ToString().Trim() + "','"
                + textBox3.Text.ToString().Trim() + "','"
                + textBox4.Text.ToString().Trim() + "','"
                +Convert.ToDateTime(textBox4.Text).AddDays(30).ToString()
                + "',0";
            if (myConnData.Command(temp))
            {
                textBox2.Text = Convert.ToString(Convert.ToInt32(textBox2.Text) + 1);
                textBox3.Text = "";
                textBox4.Text = DateTime.Now.ToString();
                textBox1.Focus();
            }
            else
                MessageBox.Show("借书失败！");
        }

        private void button2_Click(object sender, EventArgs e)
        {
            Close();
        }

        private void textBox4_TextChanged(object sender, EventArgs e)
        {
        }

        private void button4_Click(object sender, EventArgs e)
        {
            ReaderInforManagement.ReaderInforM myReaderInforM = new BooksM.ReaderInforManagement.ReaderInforM();
            MainManage myMainManage = new MainManage();
             myMainManage.GetTabPage= 1;
            myReaderInforM.ShowDialog();
        }
    }
}