获取Sql服务器列表 (C#)

王朝c#·作者佚名  2006-01-09
窄屏简体版  字體: |||超大  

怎么实现这个功能大家肯定早都知道了,放上来是给自己留个备份

使用:

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--

private void button1_Click_1(object sender, System.EventArgs e)

...{

string[] servers = DBGrep.SqlLocator.GetServers();

foreach ( string s in servers )

...{

this.listBox1.Items.Add(s);

}

}

类的代码

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--

using System;using System.Text;using System.Windows.Forms;using System.Runtime.InteropServices;

namespace DBGrep

...{

public class SqlLocator

...{

[DllImport("odbc32.dll")]

private static extern short SQLAllocHandle(short hType, IntPtr inputHandle, out IntPtr outputHandle);

[DllImport("odbc32.dll")]

private static extern short SQLSetEnvAttr(IntPtr henv, int attribute, IntPtr valuePtr, int strLength);

[DllImport("odbc32.dll")]

private static extern short SQLFreeHandle(short hType, IntPtr handle);

[DllImport("odbc32.dll",CharSet=CharSet.Ansi)]

private static extern short SQLBrowseConnect(IntPtr hconn, StringBuilder inString,

short inStringLength, StringBuilder outString, short outStringLength,

out short outLengthNeeded);

private const short SQL_HANDLE_ENV = 1;

private const short SQL_HANDLE_DBC = 2;

private const int SQL_ATTR_ODBC_VERSION = 200;

private const int SQL_OV_ODBC3 = 3;

private const short SQL_SUCCESS = 0;

private const short SQL_NEED_DATA = 99;

private const short DEFAULT_RESULT_SIZE = 1024;

private const string SQL_DRIVER_STR = "DRIVER=SQL SERVER";

private SqlLocator()...{}

public static string[] GetServers()

...{

string[] retval = null;

string txt = string.Empty;

IntPtr henv = IntPtr.Zero;

IntPtr hconn = IntPtr.Zero;

StringBuilder inString = new StringBuilder(SQL_DRIVER_STR);

StringBuilder outString = new StringBuilder(DEFAULT_RESULT_SIZE);

short inStringLength = (short) inString.Length;

short lenNeeded = 0;

try

...{

if (SQL_SUCCESS == SQLAllocHandle(SQL_HANDLE_ENV, henv, out henv))

...{

if (SQL_SUCCESS == SQLSetEnvAttr(henv,SQL_ATTR_ODBC_VERSION,(IntPtr)SQL_OV_ODBC3,0))

...{

if (SQL_SUCCESS == SQLAllocHandle(SQL_HANDLE_DBC, henv, out hconn))

...{

if (SQL_NEED_DATA == SQLBrowseConnect(hconn, inString, inStringLength, outString,

DEFAULT_RESULT_SIZE, out lenNeeded))

...{

if (DEFAULT_RESULT_SIZE lenNeeded)

...{

outString.Capacity = lenNeeded;

if (SQL_NEED_DATA != SQLBrowseConnect(hconn, inString, inStringLength, outString,

lenNeeded,out lenNeeded))

...{

throw new ApplicationException("Unabled to aquire SQL Servers from ODBC driver.");

}

}

txt = outString.ToString();

int start = txt.IndexOf("{") + 1;

int len = txt.IndexOf("}") - start;

if ((start 0) && (len 0))

...{

txt = txt.Substring(start,len);

}

else

...{

txt = string.Empty;

}

}

}

}

}

}

catch (Exception ex)

...{

//Throw away any error if we are not in debug mode

#if (DEBUG)

MessageBox.Show(ex.Message,"Acquire SQL Servier List Error");

#endif

txt = string.Empty;

}

finally

...{

if (hconn != IntPtr.Zero)

...{

SQLFreeHandle(SQL_HANDLE_DBC,hconn);

}

if (henv != IntPtr.Zero)

...{

SQLFreeHandle(SQL_HANDLE_ENV,hconn);

}

}

if (txt.Length 0)

...{

retval = txt.Split(",".ToCharArray());

}

return retval;

}

}

}

 
 
 
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