line information.cs

用c#编写的民航订票管理系统

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 民航订票管理系统.Company_Work
{
    public partial class Line_information : Form
    {
        #region 用户自定义变量
        /// <summary>
        /// 自定义变量
        /// </summary>
        private string strconn = "";
        private SqlCommand command;
        private SqlConnection conn;
        private DataSet ds = new DataSet();//数据集
        private SqlDataAdapter SqlDA;
        private CurrencyManager cmOrders;//数据导航
        private string temp = "";
        #endregion
        
        public Line_information()
        {
            InitializeComponent();
        }

        /// <summary>
        /// 重载构造函数
        /// </summary>
        /// <param name="stringConnection"></param>
        public Line_information(string stringConnection)
        {
            InitializeComponent();
            strconn = stringConnection;
        }

        /// <summary>
        /// 数据绑定
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void Line_information_Load_1(object sender, EventArgs e)
        {
            conn = new SqlConnection(strconn);

            string mySqlstring = "select * from Line";
            command = new SqlCommand(mySqlstring, conn);
            command.CommandType = CommandType.Text;

            SqlDA = new SqlDataAdapter();
            SqlDA.SelectCommand = command;

            this.ds.Clear();
            SqlDA.Fill(ds, "Line");
            this.dataGrid1.SetDataBinding(ds, "Line");
            this.textBox3.DataBindings.Add(new System.Windows.Forms.Binding("Text", ds, "Line.LineID"));
            this.textBox4.DataBindings.Add(new System.Windows.Forms.Binding("Text", ds, "Line.BPosition"));
            this.textBox5.DataBindings.Add(new System.Windows.Forms.Binding("Text", ds, "Line.EPosition"));
            this.comboBox1.DataBindings.Add(new System.Windows.Forms.Binding("Text", ds, "Line.CompID"));
            cmOrders = (CurrencyManager)BindingContext[ds, "Line"];

            SqlConnection cn = new SqlConnection(this.strconn);
            cn.Open();
            SqlCommand cmd = cn.CreateCommand();
            cmd.CommandText = "select distinct CompID from AirComp";
            SqlDataReader dr = cmd.ExecuteReader();
            while (dr.Read())
            {
                comboBox1.Items.Add(dr.GetValue(0).ToString().Trim());
            }

            conn.Close();
        }

        #region 工具栏控件
        /// <summary>
        /// 工具栏控件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void FirstRecord_toolStripButton_Click(object sender, EventArgs e)
        {
            this.dataGrid1.UnSelect(cmOrders.Position); //取消原选中的行
            cmOrders.Position = 0;
            this.dataGrid1.Select(cmOrders.Position); //选中当前行
            this.dataGrid1.CurrentRowIndex = cmOrders.Position; //移动表头指示图标
            return;
        }

        private void AboveRecord_toolStripButton_Click(object sender, EventArgs e)
        {
            if (cmOrders.Position >= 0)
            {
                this.dataGrid1.UnSelect(cmOrders.Position);
                cmOrders.Position--;
                this.dataGrid1.Select(cmOrders.Position);
                this.dataGrid1.CurrentRowIndex = cmOrders.Position;
            }
            return;
        }

        private void NextRecord_toolStripButton_Click(object sender, EventArgs e)
        {
            if (cmOrders.Position <= cmOrders.Count - 1)
            {
                this.dataGrid1.UnSelect(cmOrders.Position);
                cmOrders.Position++;
                this.dataGrid1.Select(cmOrders.Position);
                this.dataGrid1.CurrentRowIndex = cmOrders.Position;
            }
            return;
        }

        private void LastRecord_toolStripButton_Click(object sender, EventArgs e)
        {
            this.dataGrid1.UnSelect(cmOrders.Position);
            cmOrders.Position = cmOrders.Count - 1;
            this.dataGrid1.Select(cmOrders.Position);
            this.dataGrid1.CurrentRowIndex = cmOrders.Position;
            return;
        }

        private void NewRecord_toolStripButton_Click(object sender, EventArgs e)
        {
            //设置默认值
            temp = "新增记录";
            SetDefaultValue();
            SetModifyMode(true);
        }

        private void Xiugai_toolStripButton_Click(object sender, EventArgs e)
        {
            this.textBox3.DataBindings.Clear();
            this.textBox4.DataBindings.Clear();
            this.textBox5.DataBindings.Clear();
            this.comboBox1.DataBindings.Clear();
            this.dataGrid1.SetDataBinding(ds, "Line");
            this.textBox3.DataBindings.Add(new System.Windows.Forms.Binding("Text", ds, "Line.LineID"));
            this.textBox4.DataBindings.Add(new System.Windows.Forms.Binding("Text", ds, "Line.BPosition"));
            this.textBox5.DataBindings.Add(new System.Windows.Forms.Binding("Text", ds, "Line.EPosition"));
            this.comboBox1.DataBindings.Add(new System.Windows.Forms.Binding("Text", ds, "Line.CompID"));
            SetModifyMode(true);
        }

        private void Delete_toolStripButton_Click(object sender, EventArgs e)
        {
            DialogResult result = MessageBox.Show("确认删除？", "删除数据", MessageBoxButtons.OKCancel);
            if (result == DialogResult.OK)
                if (cmOrders.Count > 0)//立即从数据集中删除
                {
                    cmOrders.RemoveAt(cmOrders.Position);
                    SqlCommandBuilder cd = new SqlCommandBuilder(SqlDA);
                    SqlDA.Update(this.ds, "Line");
                }
                else
                    MessageBox.Show("表中为空，已无可删除数据", "提示", MessageBoxButtons.OK, MessageBoxIcon.Error);
        }

        private void Tijiao_toolStripButton_Click(object sender, EventArgs e)
        {
            if (textBox3.Text.Trim() == "")//检查非空字段
            {
                MessageBox.Show("类型名称不能为空", "提示", MessageBoxButtons.OK, MessageBoxIcon.Error);
                return;
            }
            if (temp == "新增记录")
            {
                temp = "insert into Line(LineID,BPosition,EPosition,CompID) VALUES ('" + this.textBox3.Text.Trim() + "','" + this.textBox4.Text.Trim() + "','" + this.textBox5.Text.Trim() + "','" + this.comboBox1.Text.Trim() + "')";
                //temp="INSERT INTO PLANE(PlaneID,type,SeatsNum,CompID) values('ef12d','null','null','A05')";
                SqlCommand mysqlcommand = new SqlCommand(temp, conn);
                mysqlcommand.CommandType = CommandType.Text;
                conn.Open();
                mysqlcommand.ExecuteNonQuery();
                conn.Close();
                this.dataGrid1.SetDataBinding(null, null);
                this.dataGrid1.Update();
                SqlDA = new SqlDataAdapter();
                SqlDA.SelectCommand = command;
                this.ds.Clear();
                SqlDA.Fill(ds, "Line");
                this.dataGrid1.SetDataBinding(this.ds, "Line");
                temp = "";
            }
            cmOrders.EndCurrentEdit();
            if (ds.GetChanges() != null)
            {
                try
                {
                    SqlCommandBuilder cd = new SqlCommandBuilder(SqlDA);
                    SqlDA.Update(ds, "Line");
                    SetModifyMode(false);
                }
                catch (Exception express)
                {
                    MessageBox.Show(express.ToString(), "提示", MessageBoxButtons.OK, MessageBoxIcon.Error);
                    ds.RejectChanges();
                }
            }
            return;
        }

        private void cancel_toolStripButton_Click(object sender, EventArgs e)
        {
            try
            {
                cmOrders.CancelCurrentEdit();  //取消编辑
                SetModifyMode(false);
            }
            catch (Exception express)
            {
                MessageBox.Show(express.ToString(), "提示", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
            return;
        }

        private void Close_toolStripButton_Click(object sender, EventArgs e)
        {
            this.Close();
        }

        /// <summary>
        ///设置默认值 
        /// </summary>
        private void SetDefaultValue()
        {
            this.textBox3.DataBindings.Clear();
            this.textBox4.DataBindings.Clear();
            this.textBox5.DataBindings.Clear();
            this.comboBox1.DataBindings.Clear();
            this.textBox3.Text = "P";
            this.textBox4.Text = "NULL";
            this.textBox5.Text = "NULL";
            comboBox1.SelectedIndex = 0;//选择默认类型
        }
        /// <summary>
        /// 控件只读属性设置
        /// </summary>
        /// <param name="blnEdit">bool型值改变控件的只读属性</param>
        private void SetModifyMode(bool blnEdit)
        {
            //设置文本框属性
            this.textBox3.ReadOnly = !blnEdit;
            this.textBox4.ReadOnly = !blnEdit;
            this.textBox5.ReadOnly = !blnEdit;
            //this.comboBox1.ReadOnly = !blnEdit;
            //设置搜索按钮属性
            Sousuo_button.Enabled = !blnEdit;
        }
        #endregion

        #region 航线信息查询
        /// <summary>
        /// 按起点城市与终点城市查询
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void Sousuo_button_Click(object sender, EventArgs e)
        {
            if (this.textBox1.Text.Trim() != "")
            {
                if (this.textBox2.Text.Trim() != "")
                {
                    string mySqlstring = "select * from Line where BPosition like '%" + this.textBox1.Text.Trim() + "%' and EPosition like '%" + this.textBox2.Text.Trim() + "%'";
                    command = new SqlCommand(mySqlstring, conn);
                    command.CommandType = CommandType.Text;
                    SqlDA = new SqlDataAdapter();
                    SqlDA.SelectCommand = command;
                    this.ds.Clear();
                    SqlDA.Fill(ds, "Line");
                    this.dataGrid1.SetDataBinding(ds, "Line");
                    cmOrders = (CurrencyManager)BindingContext[ds, "Line"];
                }
                else
                {
                    string mySqlstring = "select * from Line where BPosition like '%" + this.textBox1.Text.Trim() + "%'";
                    command = new SqlCommand(mySqlstring, conn);
                    command.CommandType = CommandType.Text;
                    SqlDA = new SqlDataAdapter();
                    SqlDA.SelectCommand = command;
                    this.ds.Clear();
                    SqlDA.Fill(ds, "Line");
                    this.dataGrid1.SetDataBinding(ds, "Line");
                    cmOrders = (CurrencyManager)BindingContext[ds, "Line"];
                }
            }
            else
            {
                if (this.textBox2.Text.Trim() != "")
                {
                    string mySqlstring = "select * from Line where EPosition like '%" + this.textBox2.Text.Trim() + "%'";
                    command = new SqlCommand(mySqlstring, conn);
                    command.CommandType = CommandType.Text;
                    SqlDA = new SqlDataAdapter();
                    SqlDA.SelectCommand = command;
                    this.ds.Clear();
                    SqlDA.Fill(ds, "Line");
                    this.dataGrid1.SetDataBinding(ds, "Line");
                    cmOrders = (CurrencyManager)BindingContext[ds, "Line"];
                }
                else
                {
                    string mySqlstring = "select * from Line";
                    command = new SqlCommand(mySqlstring, conn);
                    command.CommandType = CommandType.Text;
                    SqlDA = new SqlDataAdapter();
                    SqlDA.SelectCommand = command;
                    this.ds.Clear();
                    SqlDA.Fill(ds, "Line");
                    this.dataGrid1.SetDataBinding(ds, "Line");
                    cmOrders = (CurrencyManager)BindingContext[ds, "Line"];
                }
            }
        }
        #endregion
    }
}