在C#中使用控件DataGridView实现数据库增删改查

using System;


using System.Collections.Generic;


using System.ComponentModel;


using System.Data;


using System.Data.SqlClient;


using System.Drawing;


using System.Text;


using System.Windows.Forms;




namespace DataSource


...{


public partial class Form1 : Form


...{


public Form1()


...{


InitializeComponent();


}




private DataSet ds = new DataSet();


private SqlConnection conn = null;


private SqlDataAdapter da = null;


private const string DRIVER = "server=.;database=northwind;uid=sa;pwd=sa";


private const string sql_select = "select * from region";




/**//**


* 此方法为将数据库northwind中的region表的数据查询出来并放入DataSet中


**/


private void Form1_Load(object sender, EventArgs e)


...{


conn = new SqlConnection(DRIVER);


da = new SqlDataAdapter(sql_select,conn);


da.Fill(ds,"table");


this.dataGridView1.DataSource = ds.Tables["table"].DefaultView;


}




private bool BtnInsert() //此方法作用于添加


...{


da.InsertCommand = conn.CreateCommand();


da.InsertCommand.CommandText = "insert into region values(@id,@ption)";


da.InsertCommand.Parameters.Add("@id", SqlDbType.Int, 4, "regionid");


da.InsertCommand.Parameters.Add("@ption", SqlDbType.VarChar, 10, "regiondescription");


int count = da.Update(ds);


bool result = count > 0 ? true : false;


return result;


}


private void button1_Click(object sender, EventArgs e)


...{


if (this.BtnInsert())//调用此方法


...{


MessageBox.Show("添加成功!");


}


else


...{


MessageBox.Show("添加失败!");


}


}






private bool BtnDelect() //此方法作用于删除


...{


SqlParameter sp = new SqlParameter();


da.DeleteCommand = conn.CreateCommand();


da.DeleteCommand.CommandText = "delete region where regionid=@id";


sp = da.DeleteCommand.Parameters.Add("@id", SqlDbType.Int, 4, "regionid");


sp.SourceVersion = DataRowVersion.Original;


ds.Tables["table"].Rows[this.dataGridView1.CurrentRow.Index].Delete();


int count = da.Update(ds);


bool result = count > 0 ? true : false;


return result;


}


private void button2_Click(object sender, EventArgs e)


...{


if (this.BtnDelect())//调用删除方法


...{


MessageBox.Show("删除成功!");


}


else


...{


MessageBox.Show("删除失败!");


}


}






private bool BtnUpdate() //此方法作用于修改


...{


SqlParameter sp = new SqlParameter();


da.UpdateCommand = conn.CreateCommand();


da.UpdateCommand.CommandText = "update region set regionid=@id,regiondescription=@ption where regionid=@oldid";




da.UpdateCommand.Parameters.Add("@id", SqlDbType.Int, 4, "regionid");


da.UpdateCommand.Parameters.Add("@ption", SqlDbType.VarChar, 10, "regiondescription");




sp = da.UpdateCommand.Parameters.Add("@oldid", SqlDbType.Int, 4, "regionid");


sp.SourceVersion = DataRowVersion.Original;





int count = da.Update(ds);


bool result = count > 0 ? true : false;


return result;


}


private void button3_Click(object sender, EventArgs e)


...{


if (this.BtnUpdate())//调用修改方法


...{


MessageBox.Show("修改成功!");


}


else


...{


MessageBox.Show("修改失败!");


}


}






}


}