用dataGridView实现增删改查

       只需一个窗体一个dataGridView控件，即可实现系统中所有基础数据的维护操作，真是太简单实用了，还不快Get了？

1、公共类User.cs：

public abstract class DBUser
{
    public static string sServer;
    public static string sDBName;
    public static string sUser;
    public static string sPasswd;
}
public abstract class dataGrid
{
    public static int ROW, COL;
    public static string rKey, Text, PID;
    public static int flag;
    public static int Count;
}
public abstract class DBTable
{
    public static int wStatus;
    public static string dbTableName;//表名称
    public static string dbViewName;//数据库试图名称
    public static string[] dbFields;//字段
    public static string[] dbCFields;//中文字段，用来代替数据库试图
    public static int[] fStatus;//字段是否为标识
    public static bool[] IsNull;//字段是否为空
    public static int FieldCount;//字段数目
    public static string Proc_insert;//插入数据的存储过程
    public static string Proc_update;//更新数据的存储过程
}

2、Main.cs:

using System;
using System.Windows.Forms;

namespace 项目实战学习
{
    public partial class Main : Form
    {
        public Main()
        {
            InitializeComponent();
        }

        private void 单位维护ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            int n = 15;
            DBTable.dbTableName = "Unit_S";
            DBTable.dbViewName = "View_Unit_S";
            DBTable.FieldCount = n;
            DBTable.dbFields = new string[n];
            DBTable.dbCFields = new string[n];
            DBTable.fStatus = new int[n];
            DBTable.IsNull = new bool[n];
            DBTable.dbFields[0] = "U#";  //DBTable.dbCFields[0] = "编码";    //用于代替数据库视图
            DBTable.dbFields[1] = "Uname"; //DBTable.dbCFields[1] = "定义";
            DBTable.dbFields[2] = "Place"; //DBTable.dbCFields[2] = "备注";
            DBTable.dbFields[3] = "PlaceCounty";
            DBTable.dbFields[4] = "Code";
            DBTable.dbFields[5] = "Chuanzhen";
            DBTable.dbFields[6] = "People";
            DBTable.dbFields[7] = "Tel";
            DBTable.dbFields[8] = "Quhao";
            DBTable.dbFields[9] = "Zizhi";
            DBTable.dbFields[10] = "Grade";
            DBTable.dbFields[11] = "DATE";
            DBTable.dbFields[12] = "Address";
            DBTable.dbFields[13] = "PID";
            DBTable.dbFields[14] = "FaDing_People";

            DBTable.Proc_insert = "InsertUnit_S";
            DBTable.Proc_update = "UpdateUnit_S";

            //标识列，自动增长的字段设为-1
            DBTable.fStatus[0] = -1;
            for (int i = 1; i < 15; i++)
                DBTable.fStatus[i] = 1;

            DBTable.IsNull[0] = false;//不能为空，一般只主键
            for (int i = 1; i < 15; i++)
                DBTable.IsNull[i] = true;

            Form1 f1 = new Form1();
            f1.MdiParent = this;
            f1.Text = "单位维护";
            f1.Show();
        }
    }
}

3、form1.cs：

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 项目实战学习
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        private void Form1_Load(object sender, EventArgs e)
        {
            RefreshGrid();
        }

        private void dataGridView1_CellMouseDown(object sender, DataGridViewCellMouseEventArgs e)
        {
            if(e.RowIndex<0 || e.ColumnIndex<0)
            {
                dataGrid.flag = -10;
                return;
            }
            dataGrid.Count = dataGridView1.RowCount;
            dataGrid.ROW = e.RowIndex;
            dataGrid.COL = e.ColumnIndex;
            dataGrid.flag = 0;
            if (dataGridView1.Rows[e.RowIndex].Cells[0].Value == null)
                dataGrid.flag = -1;
            else
                dataGrid.rKey = dataGridView1.Rows[e.RowIndex].Cells[0].Value.ToString();
            if (dataGridView1.Rows[e.RowIndex].Cells[1].Value == null)
                dataGrid.flag = -2;
            else
                dataGrid.Text = dataGridView1.Rows[e.RowIndex].Cells[1].Value.ToString();
        }
        void DeleteInGrid()
        {
            if(dataGrid.flag<0)
            {
                MessageBox.Show("请选择要删除的记录"); return;
            }
            MyDBase DB = new MyDBase(DBUser.sServer, DBUser.sDBName, DBUser.sUser, DBUser.sPasswd);
            string SQL = "delete from "+DBTable.dbTableName+" where " + DBTable.dbFields[0] + "='" + dataGrid.rKey + "'";
            DB.ExecuteSQL(SQL);
            DB.DBClose();
            RefreshGrid();
        }

        private void 该行写进数据库ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            GridInsert(dataGrid.ROW);
        }
        void GridUpdate(int n)
        {

            if (dataGrid.flag < 0)
            {
                MessageBox.Show("没有数据的行，无法更新", "更新错误提示", MessageBoxButtons.OK, MessageBoxIcon.Stop);return;
            }

            int i, m;
            string SQL="";
            string[] sCells = new string[DBTable.FieldCount];
            for (i = 0; i < DBTable.FieldCount; i++)
            {
                if (DBTable.fStatus[i] < 0)
                {
                    sCells[i] = ""; continue;
                }
                if (DBTable.fStatus[i] >= 0 && dataGridView1.Rows[n].Cells[2].Value != null)
                    sCells[i] = dataGridView1.Rows[n].Cells[i].Value.ToString().Trim();
            }
            for (i = 1; i < DBTable.FieldCount; i++)//不包括主键字段
            {
                if (DBTable.fStatus[i] == 0) SQL = SQL  + sCells[i] + ",";
                if (DBTable.fStatus[i] == 1) SQL = SQL +  "'" + sCells[i] + "',";
            }
            m = SQL.Length;
            SQL = SQL.Substring(0, m - 1);
            SQL = "exec " + DBTable.Proc_update + " "+dataGrid.rKey+"," +SQL;
            MyDBase DB = new MyDBase(DBUser.sServer, DBUser.sDBName, DBUser.sUser, DBUser.sPasswd);
            DB.ExecuteSQL(SQL);
            if (DB.ErrorCode())
            {
                MessageBox.Show(DB.ErrMessage(), "数据更新错误", MessageBoxButtons.OK, MessageBoxIcon.Stop);
                DB.DBClose();
                return;
            }
            DB.DBClose();
            RefreshGrid();
        }
        void GridInsert(int n)
        {
            int i, m;
            string SQL="";
            string[] sCells = new string[DBTable.FieldCount];
            for (i = 0; i < DBTable.FieldCount; i++)
            {
                if (DBTable.fStatus[i] < 0)
                {
                    sCells[i] = ""; continue;
                }
                if (DBTable.fStatus[i] >= 0 && dataGridView1.Rows[n].Cells[1].Value != null)
                    sCells[i] = dataGridView1.Rows[n].Cells[i].Value.ToString().Trim();
            }

            for (i = 1; i < DBTable.FieldCount; i++)
            {
                if (DBTable.fStatus[i] == 0) SQL = SQL + sCells[i] + ",";//数值型
                if (DBTable.fStatus[i] == 1) SQL = SQL + "'" + sCells[i] + "',";//字符串型
            }
            m = SQL.Length;
            SQL = SQL.Substring(0, m - 1);
            SQL = "EXEC "+DBTable.Proc_insert+ " "+SQL;
            MyDBase DB = new MyDBase(DBUser.sServer, DBUser.sDBName, DBUser.sUser, DBUser.sPasswd);
            DB.ExecuteSQL(SQL);
            if (DB.ErrorCode())
            {
                MessageBox.Show(DB.ErrMessage(), "数据插入错误", MessageBoxButtons.OK, MessageBoxIcon.Stop);
                DB.DBClose();
                return;
            }
            DB.DBClose();
            RefreshGrid();
        }
        void RefreshGrid()
        {
            MyDBase DB = new MyDBase(DBUser.sServer, DBUser.sDBName, DBUser.sUser, DBUser.sPasswd);
            string SQL = "select * from " + DBTable.dbViewName;
            DataSet DS = DB.GetRecordset(SQL);
            dataGridView1.DataSource = DS.Tables[0];
            DB.DBClose();
        }
        private void 删除该行记录ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            DeleteInGrid();
        }

        private void 更新该行记录ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            GridUpdate(dataGrid.ROW);
        }
    }
}