中财网爱的快递电视剧全集(1:asp.net连接数据库实例代码
来源：百度文库 编辑：中财网 时间：2024/05/06 01:04:12
using System;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.Data.SqlClient;public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{ }
protected void btnConn_Click(object sender, EventArgs e)
{
SqlConnection conn = new SqlConnection();
conn.ConnectionString = "Data Source=PC-2009092011513\\SQLEXPRESS;Initial Catalog=Northwind;User ID=sa;Password=123456";
conn.Open();
lblResult.Text = "数据库连接成功！";
//关闭数据库的链接
conn.Close();
//释放资源
conn.Dispose();
}
protected void btnComm_Click(object sender, EventArgs e)
{
SqlConnection conn = new SqlConnection();
conn.ConnectionString = "Data Source=PC-2009092011513\\SQLEXPRESS;Initial Catalog=Northwind;User ID=sa;Password=123456";
conn.Open();
SqlCommand comm = new SqlCommand();
comm.CommandText = "select * from Employees";
comm.Connection = conn;
SqlDataReader data;
data = comm.ExecuteReader();
lblCmdResult.Text = "命令执行完毕！";
conn.Close();
conn.Dispose();
}
protected void btnRuselt_Click(object sender, EventArgs e)
{
SqlConnection conn = new SqlConnection();
conn.ConnectionString = "Data Source=PC-2009092011513\\SQLEXPRESS;Initial Catalog=Northwind;User ID=sa;Password=123456";
conn.Open();
SqlCommand comm = new SqlCommand();
comm.CommandText = "select EmployeeID as 员工编号,LastName+' '+FirstName as 姓名,Title as 职务,Address as 地址,City as 城市 from Employees";
comm.Connection = conn;
SqlDataReader data = comm.ExecuteReader();
Response.Write("");
");
lblDisplayResult.Text = "数据显示完毕！";
data.Close();
conn.Close();
conn.Dispose();
}
protected void btnPara_Click(object sender, EventArgs e)
{
SqlConnection conn = new SqlConnection();
conn.ConnectionString = "Data Source=PC-2009092011513\\SQLEXPRESS;Initial Catalog=Northwind;User ID=sa;Password=123456";
conn.Open();
SqlCommand comm = new SqlCommand();
comm.CommandText = "select EmployeeID as 员工编号,LastName+' '+FirstName as 姓名,Title as 职务,Address as 地址,City as 城市 from Employees where City=@city";
SqlParameter parmCity = new SqlParameter("@city", SqlDbType.NVarChar, 15);
parmCity.Value = txtCity.Text;
comm.Parameters.Add(parmCity);
comm.Connection = conn;
SqlDataReader data = comm.ExecuteReader();
Response.Write("");
");
lblDisplayResult.Text = "数据显示完毕！";
data.Close();
conn.Close();
conn.Dispose();
}
protected void btnProc_Click(object sender, EventArgs e)
{
/*
存储过程的创建
create procedure GetEmployeesByCity
@city nvarchar(15)=null
as
select EmployeeID as 员工编号,LastName +' '+ FirstName as 姓名,
Title as 职务,Address as 地址,City as 城市 from Employees where City=@city
*/ SqlConnection conn = new SqlConnection();
conn.ConnectionString = "Data Source=PC-2009092011513\\SQLEXPRESS;Initial Catalog=Northwind;User ID=sa;Password=123456";
conn.Open();
SqlCommand comm = new SqlCommand();
comm.CommandType = CommandType.StoredProcedure;
comm.CommandText = "GetEmployeesByCity";
SqlParameter parmCity = new SqlParameter("@city", SqlDbType.NVarChar, 15);
parmCity.Direction = ParameterDirection.Input; //输入参数
parmCity.Value = txtProc.Text;
comm.Parameters.Add(parmCity);
comm.Connection = conn;
SqlDataReader data = comm.ExecuteReader();
Response.Write("");
");
lblDisplayResult.Text = "数据显示完毕！";
data.Close();
conn.Close();
conn.Dispose();
}
protected void btnData_Click(object sender, EventArgs e)
{
SqlConnection conn = new SqlConnection();
conn.ConnectionString = "Data Source=PC-2009092011513\\SQLEXPRESS;Initial Catalog=Northwind;User ID=sa;Password=123456";
conn.Open();
SqlCommand comm = new SqlCommand();
comm.CommandText = "update Employees set Country='UK' where Country='英国'";
comm.Connection = conn;
int rows = comm.ExecuteNonQuery();
lblData.Text = rows.ToString();
conn.Close();
conn.Dispose();
}
protected void btnSingeResult_Click(object sender, EventArgs e)
{
SqlConnection conn = new SqlConnection();
conn.ConnectionString = "Data Source=PC-2009092011513\\SQLEXPRESS;Initial Catalog=Northwind;User ID=sa;Password=123456";
conn.Open();
SqlCommand comm = new SqlCommand();
comm.CommandText = "select AVG(UnitPrice) from Products as 平均价格 where SupplierID=(select SupplierID from Suppliers where CompanyName='Ma Maison')";
comm.Connection = conn;
float avgPrice = float.Parse(comm.ExecuteScalar().ToString());
lblSingeResult.Text = avgPrice.ToString();
conn.Close();
conn.Dispose();
}
}
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.Data.SqlClient;public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{ }
protected void btnConn_Click(object sender, EventArgs e)
{
SqlConnection conn = new SqlConnection();
conn.ConnectionString = "Data Source=PC-2009092011513\\SQLEXPRESS;Initial Catalog=Northwind;User ID=sa;Password=123456";
conn.Open();
lblResult.Text = "数据库连接成功！";
//关闭数据库的链接
conn.Close();
//释放资源
conn.Dispose();
}
protected void btnComm_Click(object sender, EventArgs e)
{
SqlConnection conn = new SqlConnection();
conn.ConnectionString = "Data Source=PC-2009092011513\\SQLEXPRESS;Initial Catalog=Northwind;User ID=sa;Password=123456";
conn.Open();
SqlCommand comm = new SqlCommand();
comm.CommandText = "select * from Employees";
comm.Connection = conn;
SqlDataReader data;
data = comm.ExecuteReader();
lblCmdResult.Text = "命令执行完毕！";
conn.Close();
conn.Dispose();
}
protected void btnRuselt_Click(object sender, EventArgs e)
{
SqlConnection conn = new SqlConnection();
conn.ConnectionString = "Data Source=PC-2009092011513\\SQLEXPRESS;Initial Catalog=Northwind;User ID=sa;Password=123456";
conn.Open();
SqlCommand comm = new SqlCommand();
comm.CommandText = "select EmployeeID as 员工编号,LastName+' '+FirstName as 姓名,Title as 职务,Address as 地址,City as 城市 from Employees";
comm.Connection = conn;
SqlDataReader data = comm.ExecuteReader();
Response.Write("
| "); Response.Write("员工编号"); Response.Write(" | ");"); Response.Write("姓名"); Response.Write(" | ");"); Response.Write("职务"); Response.Write(" | ");"); Response.Write("地址"); Response.Write(" | ");"); Response.Write("城市"); Response.Write(" | ");
| "); Response.Write(data.GetValue(0).ToString()); Response.Write(" | ");"); Response.Write(data.GetValue(1).ToString()); Response.Write(" | ");"); Response.Write(data.GetValue(2).ToString()); Response.Write(" | ");"); Response.Write(data.GetValue(3).ToString()); Response.Write(" | ");"); Response.Write(data.GetValue(4).ToString()); Response.Write(" | ");
lblDisplayResult.Text = "数据显示完毕！";
data.Close();
conn.Close();
conn.Dispose();
}
protected void btnPara_Click(object sender, EventArgs e)
{
SqlConnection conn = new SqlConnection();
conn.ConnectionString = "Data Source=PC-2009092011513\\SQLEXPRESS;Initial Catalog=Northwind;User ID=sa;Password=123456";
conn.Open();
SqlCommand comm = new SqlCommand();
comm.CommandText = "select EmployeeID as 员工编号,LastName+' '+FirstName as 姓名,Title as 职务,Address as 地址,City as 城市 from Employees where City=@city";
SqlParameter parmCity = new SqlParameter("@city", SqlDbType.NVarChar, 15);
parmCity.Value = txtCity.Text;
comm.Parameters.Add(parmCity);
comm.Connection = conn;
SqlDataReader data = comm.ExecuteReader();
Response.Write("
| "); Response.Write("员工编号"); Response.Write(" | ");"); Response.Write("姓名"); Response.Write(" | ");"); Response.Write("职务"); Response.Write(" | ");"); Response.Write("地址"); Response.Write(" | ");"); Response.Write("城市"); Response.Write(" | ");
| "); Response.Write(data.GetValue(0).ToString()); Response.Write(" | ");"); Response.Write(data.GetValue(1).ToString()); Response.Write(" | ");"); Response.Write(data.GetValue(2).ToString()); Response.Write(" | ");"); Response.Write(data.GetValue(3).ToString()); Response.Write(" | ");"); Response.Write(data.GetValue(4).ToString()); Response.Write(" | ");
lblDisplayResult.Text = "数据显示完毕！";
data.Close();
conn.Close();
conn.Dispose();
}
protected void btnProc_Click(object sender, EventArgs e)
{
/*
存储过程的创建
create procedure GetEmployeesByCity
@city nvarchar(15)=null
as
select EmployeeID as 员工编号,LastName +' '+ FirstName as 姓名,
Title as 职务,Address as 地址,City as 城市 from Employees where City=@city
*/ SqlConnection conn = new SqlConnection();
conn.ConnectionString = "Data Source=PC-2009092011513\\SQLEXPRESS;Initial Catalog=Northwind;User ID=sa;Password=123456";
conn.Open();
SqlCommand comm = new SqlCommand();
comm.CommandType = CommandType.StoredProcedure;
comm.CommandText = "GetEmployeesByCity";
SqlParameter parmCity = new SqlParameter("@city", SqlDbType.NVarChar, 15);
parmCity.Direction = ParameterDirection.Input; //输入参数
parmCity.Value = txtProc.Text;
comm.Parameters.Add(parmCity);
comm.Connection = conn;
SqlDataReader data = comm.ExecuteReader();
Response.Write("
| "); Response.Write("员工编号"); Response.Write(" | ");"); Response.Write("姓名"); Response.Write(" | ");"); Response.Write("职务"); Response.Write(" | ");"); Response.Write("地址"); Response.Write(" | ");"); Response.Write("城市"); Response.Write(" | ");
| "); Response.Write(data.GetValue(0).ToString()); Response.Write(" | ");"); Response.Write(data.GetValue(1).ToString()); Response.Write(" | ");"); Response.Write(data.GetValue(2).ToString()); Response.Write(" | ");"); Response.Write(data.GetValue(3).ToString()); Response.Write(" | ");"); Response.Write(data.GetValue(4).ToString()); Response.Write(" | ");
lblDisplayResult.Text = "数据显示完毕！";
data.Close();
conn.Close();
conn.Dispose();
}
protected void btnData_Click(object sender, EventArgs e)
{
SqlConnection conn = new SqlConnection();
conn.ConnectionString = "Data Source=PC-2009092011513\\SQLEXPRESS;Initial Catalog=Northwind;User ID=sa;Password=123456";
conn.Open();
SqlCommand comm = new SqlCommand();
comm.CommandText = "update Employees set Country='UK' where Country='英国'";
comm.Connection = conn;
int rows = comm.ExecuteNonQuery();
lblData.Text = rows.ToString();
conn.Close();
conn.Dispose();
}
protected void btnSingeResult_Click(object sender, EventArgs e)
{
SqlConnection conn = new SqlConnection();
conn.ConnectionString = "Data Source=PC-2009092011513\\SQLEXPRESS;Initial Catalog=Northwind;User ID=sa;Password=123456";
conn.Open();
SqlCommand comm = new SqlCommand();
comm.CommandText = "select AVG(UnitPrice) from Products as 平均价格 where SupplierID=(select SupplierID from Suppliers where CompanyName='Ma Maison')";
comm.Connection = conn;
float avgPrice = float.Parse(comm.ExecuteScalar().ToString());
lblSingeResult.Text = avgPrice.ToString();
conn.Close();
conn.Dispose();
}
}
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