ado.net c#基本的增加,修改,删除,查询

class AdoDemo
{
static string strConn = @"Data Source=server1;Initial Catalog=NameCard;Integrated Security=False;User ID=sa;Password=******;Connect Timeout=15;Encrypt=False;TrustServerCertificate=False";
static void Main(string[] args)
{
//InsertData();//1.1插入新数据练习
//InsertDataParameters();//1.2插入新数据练习,Parameters方法
//updataData();//更新数据
//DelData();//删除数据
//QueryDataByDs();//使用dataadapter,dataset查询数据
//QueryByDr();//使用dataread查询数据
//querybyDt();//使用datatable查询数据
Console.ReadKey();
}

#region 1.1插入新数据
private static void InsertData()
{
using (SqlConnection connection = new SqlConnection(strConn))
{
connection.Open();
using (SqlCommand sqlcmd = connection.CreateCommand())
{
string strCmd = "insert into Customer (region,Name,Department) values ('jinan','li','shandong')";
sqlcmd.CommandText = strCmd;
if (sqlcmd.ExecuteNonQuery() > 0)
{
Console.WriteLine("插入成功");
}
else
{
Console.WriteLine("插入失败");
}
}
}
}
#endregion

#region 1.2插入新数据,Parameters方法
private static void InsertDataParameters()
{
using (SqlConnection connection = new SqlConnection(strConn))
{
connection.Open();
using (SqlCommand sqlCmd = connection.CreateCommand())
{
string sqlStr = "insert into Customer (region,Name,Department) values (@region,@name,@depart)";
sqlCmd.CommandText = sqlStr;
sqlCmd.Parameters.Add("@region", SqlDbType.NVarChar);
sqlCmd.Parameters["@region"].Value = "Sichuan";
sqlCmd.Parameters.AddWithValue("@name", "Chong");
sqlCmd.Parameters.AddWithValue("@depart", "qing");
if (sqlCmd.ExecuteNonQuery() > 0)
{
Console.WriteLine("插入成功");
}
else
{
Console.WriteLine("插入失败");
}
}
}
}
#endregion

#region 2 修改数据练习
private static void updataData()
{
using (SqlConnection connection = new SqlConnection(strConn))
{
connection.Open();
using (SqlCommand sqlCmd = connection.CreateCommand())
{
string cmdStr = "update Customer set Name='@name' where id='2845'";
sqlCmd.CommandText = cmdStr;
if (sqlCmd.ExecuteNonQuery() > 0)
{
Console.WriteLine("插入成功");
}
else
{
Console.WriteLine("插入失败");
}
}
}
}
#endregion

#region 3 删除数据 练习
private static void DelData()
{
using (SqlConnection connection = new SqlConnection(strConn))
{
connection.Open();
using (SqlCommand sqlcmd = connection.CreateCommand())
{
string cmdStr = "delete from Customer where id >='2840'";
sqlcmd.CommandText = cmdStr;
if (sqlcmd.ExecuteNonQuery() > 0)
{
Console.WriteLine("删除成功");
}
else
{
Console.WriteLine("删除失败");
}
}
}
}
#endregion

#region 4.1 使用dataadapter,dataset查询数据
private static void QueryDataByDs()
{
using (SqlConnection connection = new SqlConnection(strConn))
{
connection.Open();
string cmdStr = "select top 20 * from Customer";
SqlDataAdapter sqlda = new SqlDataAdapter(cmdStr, strConn);
DataSet ds = new DataSet();
sqlda.Fill(ds, "customer");
foreach (DataRow dr in ds.Tables[0].Rows)
{
Console.WriteLine("ID={0},region={1},department={2},name={3},phone1={4}", dr[0], dr[1], dr[2], dr[3], dr[4]);
}
}
}
#endregion

#region 4.2 使用datareader查询数据
private static void QueryByDr()
{
using (SqlConnection connection = new SqlConnection(strConn))
{
connection.Open();
using (SqlCommand sqlCmd = connection.CreateCommand())
{
string cmdStr = "select top 10 * from Customer";
sqlCmd.CommandText = cmdStr;
SqlDataReader sqlDr = sqlCmd.ExecuteReader();
while (sqlDr.HasRows)//是否返回数据
{
while (sqlDr.Read())//从第一行开始顺序读取数据集到最后一行
{
Console.WriteLine("ID={0},region={1},department={2},name={3},phone1={4}", sqlDr[0].ToString(), sqlDr[1].ToString(), sqlDr[2].ToString(), sqlDr[3].ToString(), sqlDr[4].ToString());
}
}
}
}
}
#endregion

#region 4.3 使用datatable查询数据
private static void querybyDt()
{
SqlConnection connection = new SqlConnection(strConn);
connection.Open();
string cmdStr = "select top 10 * from Customer";
SqlDataAdapter sqlda = new SqlDataAdapter(cmdStr,connection);
DataTable dt = new DataTable();
sqlda.Fill(dt);
foreach (DataRow item in dt.Rows)
{
Console.WriteLine("{0},{1},{2}", item[0].ToString(), item[1].ToString(), item[2].ToString());
}
connection.Close();
}
#endregion
}