c#怎么书写连接sqlserver数据库的语句
using System;
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using System.Collections.Generic;
using System.Text;
using System.Data;
using System.Data.SqlClient;
using System.Collections;
using System.Net;
namespace HR_Checker.common
{
class sqldate_111
{
private string conn = "server=127.0.0.1;database=main;uid=sa;pwd=@12345;Max Pool Size = 1000;Connection Timeout=180";
public SqlConnection ExceCon()
{
SqlConnection connection = new SqlConnection(this.conn);
connection.Open();
return connection;
}
public SqlDataReader ExceDr(string cmdtxt)
{
SqlCommand command = new SqlCommand(cmdtxt, this.ExceCon());
return command.ExecuteReader();
}
public DataSet ExceDS(string cmdtxt, string tblName)
{
SqlConnection connection = this.ExceCon();
DataSet dataSet = null;
try
{
SqlCommand command = new SqlCommand(cmdtxt, connection);
SqlDataAdapter adapter = new SqlDataAdapter();
adapter.SelectCommand = command;
dataSet = new DataSet(tblName);
adapter.Fill(dataSet);
}
catch
{
connection.Close();
}
return dataSet;
}
public bool ExceSQL(string cmdtxt)
{
bool flag;
SqlCommand command = new SqlCommand(cmdtxt, this.ExceCon());
try
{
command.ExecuteNonQuery();
flag = true;
}
catch
{
flag = false;
}
finally
{
this.ExceCon().Close();
}
return flag;
}
}
}
你在外边引用这个类 sqldate_111 data = new common.sqldate_111()
下面
DataSet ds = data.ExceDS(sql, "dd");
DataTable dt = ds.Tables[0];
dt 是返回表
this.data111.ExceSQL(insertsql); 这个是执行sql语句
记得修改命名空间
如何用c#实现把socket接收的数据写入sqlserver数据库
Asp.net中C#使用Socket发送和接收TCP数据的方法。
具体程序代码如下：
using System;
using System.Collections.Generic;
using System.Net;
using System.Net.Sockets;
using System.Text;
namespace ConsoleApplication1
{
public static class SocketTest
{
private static Encoding encode = Encoding.Default;
/// summary
/// 监听请求
/// /summary
/// param name="port"/param
public static void Listen(int port)
{
Socket listenSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
listenSocket.Bind(new IPEndPoint(IPAddress.Any, port));
listenSocket.Listen(100);
Console.WriteLine("Listen " + port + " ...");
while (true)
{
Socket acceptSocket = listenSocket.Accept();
string receiveData = Receive(acceptSocket, 5000); //5 seconds timeout.
Console.WriteLine("Receive：" + receiveData);
acceptSocket.Send(encode.GetBytes("ok"));
DestroySocket(acceptSocket); //import
}
}
/// summary
/// 发送数据
/// /summary
/// param name="host"/param
/// param name="port"/param
/// param name="data"/param
/// returns/returns
public static string Send(string host, int port, string data)
{
string result = string.Empty;
Socket clientSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
clientSocket.Connect(host, port);
clientSocket.Send(encode.GetBytes(data));
Console.WriteLine("Send：" + data);
result = Receive(clientSocket, 5000 * 2); //5*2 seconds timeout.
Console.WriteLine("Receive：" + result);
DestroySocket(clientSocket);
return result;
}
/// summary
/// 接收数据
/// /summary
/// param name="socket"/param
/// param name="timeout"/param
/// returns/returns
private static string Receive(Socket socket, int timeout)
{
string result = string.Empty;
socket.ReceiveTimeout = timeout;
Listbyte data = new Listbyte();
byte[] buffer = new byte[1024];
int length = 0;
try
{
while ((length = socket.Receive(buffer)) 0)
{
for (int j = 0; j length; j++)
{
data.Add(buffer[j]);
}
if (length buffer.Length)
{
break;
}
}
}
catch { }
if (data.Count 0)
{
result = encode.GetString(data.ToArray(), 0, data.Count);
}
return result;
}
/// summary
/// 销毁Socket对象
/// /summary
/// param name="socket"/param
private static void DestroySocket(Socket socket)
{
if (socket.Connected)
{
socket.Shutdown(SocketShutdown.Both);
}
socket.Close();
}
}
}
C#如何编写一段程序，能控制SqlServer数据库服务重启？
public string RunDosCommand(string command)
{
Process process = new Process();
process.StartInfo.FileName = "cmd.exe";
process.StartInfo.UseShellExecute = false;
process.StartInfo.RedirectStandardInput = true;
process.StartInfo.RedirectStandardOutput = true;
process.StartInfo.RedirectStandardError = true;
process.StartInfo.CreateNoWindow = true;
process.Start();
process.StandardInput.WriteLine(command);
process.StandardInput.WriteLine("exit");
return process.StandardOutput.ReadToEnd();
}
command 参数可以输入如
net start mssqlserver
net stop mssqlserver
C#获取 sqlserver 存储过程返回多表数据
返回的时候用dataset就可以,比如你存储过程这样写
select * from A
select * from B
select * from C
select * from D
select * from D
在执行完存储过程后返回一个dataset
dataset ds = 执行存储过程
ds.tables[0]就是表A
ds.tables[1]就是表B
ds.tables[2]就是表C
剩下的依次类推.
C#怎么调用sqlserver的自定义函数
sql server 自定义函数的使用
自定义函数
用户定义自定义函数像内置函数一样返回标量值，也可以将结果集用表格变量返回
用户自定义函数的类型:
标量函数:返回一个标量值
表格值函数{内联表格值函数、多表格值函数}:返回行集（即返回多个值）
1、标量函数
Create function 函数名（参数）
Returns 返回值数据类型
[with {Encryption | Schemabinding }]
[as]
begin
SQL语句(必须有return 变量或值)
End
Schemabinding :将函数绑定到它引用的对象上（注：函数一旦绑定，则不能删除、修改，除非删除绑定）
Create function AvgResult(@scode varchar(10))
Returns real
As
Begin
Declare @avg real
Declare @code varchar(11)
Set @code=@scode + ‘%’
Select @avg=avg(result) from LearnResult_baijiali
Where scode like @code
Return @avg
End
执行用户自定义函数
select 用户名。函数名 as 字段别名
select dbo.AvgResult(‘s0002’) as result
用户自定义函数返回值可放到局部变量中，用set ,select,exec赋值
declare @avg1 real ,@avg2 real ,@avg3 real
select @avg1= dbo.AvgResult(‘s0002’)
set @avg2= dbo.AvgResult(‘s0002’)
exec @avg3= dbo.AvgResult ‘s0002’
select @avg1 as avg1 ,@avg2 as avg2 ,@avg3 as avg3
函数引用
create function code(@scode varchar(10))
returns varchar(10)
as
begin
declare @ccode varchar(10)
set @scode = @scode + ‘%’
select @ccode=ccode from cmessage
where ccode like @scode
return @ccode
end
select name from class where ccode = dbo.code(‘c001’)
2、表格值函数
a、 内联表格值函数
格式：
create function 函数名（参数）
returns table
[with {Encryption | Schemabinding }]
as
return(一条SQL语句)
create function tabcmess(@code varchar(10))
returns table
as
return(select ccode,scode from cmessage where ccode like @ccode)
b、 多句表格值函数
create function 函数名（参数）
returns 表格变量名table (表格变量定义)
[with {Encryption | Schemabinding }]
as
begin
SQL语句
end
多句表格值函数包含多条SQL语句，至少有一条在表格变量中填上数据值
表格变量格式
returns @变量名 table (column 定义| 约束定义 [,…])
对表格变量中的行可执行select,insert,update,delete ， 但select into 和 insert 语句的结果集是从存储过程插入。
Create function tabcmessalot (@code varchar(10))
Returns @ctable table(code varchar(10) null,cname varchar(100) null)
As
Begin
Insert @ctable
Select ccode,explain from cmessage
Where scode like @code
return
End
Select * from tabcmessalot(‘s0003’)
来自：
C#调用SQL自定义函数返回值
代码
1 --SQL自定义函数：
2
3 CREATE FUNCTION [GetProjectID] (@headStr nvarchar(10),@date datetime)
4 )
5
6 RETURNS NVARCHAR(200)
7
8 AS
9
10 BEGIN
11
12 --不能在自定义函数中用INSERT INTO
13
14 --insert into emos_cust(cust_name,dates)values(
15
16 --@headStr,@date
17
18 --)
19
20 return 'TEST BY HANSHU'
21 END
代码
1 /// summary
2 /// 获取项目文件编号 涂聚文
3 /// /summary
4 private void FileNo()
5 {
6
7 SqlConnection conn = new SqlConnection(connectionString);
8 string strSql = "GetProjectID"; //自定SQL函数
9 SqlCommand cmd = new SqlCommand(strSql, conn);
10 cmd.CommandType = CommandType.StoredProcedure;
11 cmd.Parameters.Add("@headStr", SqlDbType.NVarChar).Value = "ZQ3"; //输入参数
12 cmd.Parameters.Add("@date", SqlDbType.DateTime).Value = System.DateTime.Now.ToShortDateString(); //输入参数
13 cmd.Parameters.Add("@returnString", SqlDbType.NVarChar);
14 cmd.Parameters["@returnString"].Direction = ParameterDirection.ReturnValue; //返回参数
15 try
16 {
17 conn.Open();
18 object o= cmd.ExecuteScalar();
19
20 this.txtAFileNO.Text = cmd.Parameters["@returnString"].Value.ToString();
21
22 //Response.Write("");
23
24 }
25 catch (Exception ex)
26 {
27
28 this.txtAFileNO.Text = ex.Message;
29
30 }
31 finally
32 {
33
34 if (!(conn.State == ConnectionState.Closed))
35 {
36
37 conn.Close();
38
39
40 }
41
42 }
43
44
45 }
标题名称：包含c回写sqlserver的词条
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