C#使用SqlConnection连接到SQL Server的代码示例

public SQLServerAPI(string str_ip, string str_db, string str_user, string str_pwd)
{
 m_strIp = str_ip;
 m_strDb = str_db;
 m_strUser = str_user;
 m_strPwd = str_pwd;
   
 //SQLServer身份验证
 m_strConnection = @"Data Source=" + m_strIp;
 m_strConnection += @";Initial Catalog=" + m_strDb;
 m_strConnection += @";UID=" + m_strUser + ";PWD=" + m_strPwd;
 m_strConnection += ";Connection Timeout=10;Pooling=true;Max Pool Size=100";
 
 //Windows身份验证
 //m_strConnection = 
    @"server=localhost\SQLEXPRESS;database=SQL2012Db;Trusted_Connection=SSPI;";
   
 DisConnect();
 
 m_Transaction = null;
 m_SqlConnection = new SqlConnection(m_strConnection);
}

/// <summary>
/// 尝试连接数据库
/// </summary>
private bool Connect()
{
 if (m_SqlConnection == null)
  return false;
 
 try
 {
  m_SqlConnection.Open();
 }
 catch (Exception e)
 {
  Debug.WriteLine(e.Message);
  return false;
 }
  return true;
}

private bool DisConnect()
{
 if (m_SqlConnection == null)
  return true;
 
 try
 {
  m_SqlConnection.Close();
 }
 catch (Exception e)
 {
  Debug.WriteLine(e.Message);
  return false;
 }
 return true;

/// <summary>
/// 执行返回查询结果的存储过程
/// </summary>
/// <param name="procname">存储过程名?</param>
/// <param name="param">参数。函数正常返回时，所有类型为out的参数值也在对应位置上</param>
/// <param name="result">返回查询的结果</param>
/// <returns>0正确，其他错误</returns>
public int ExecQueryStoreProc(string procname, ref SqlParameter[] param, out DataTable result)
{
	if (!Connect())
	{
		result = null;
		return -1;
	}
 
	try
	{
		SqlCommand command = new SqlCommand(procname, m_SqlConnection);
		command.CommandType = CommandType.StoredProcedure;
 
		if (m_Transaction != null)
			command.Transaction = m_Transaction;
 
		SqlParameter rvalue = command.Parameters.Add(new SqlParameter("RETURN_VALUE", SqlDbType.Int));
		rvalue.Direction = ParameterDirection.ReturnValue;
 
		if (param != null)
			command.Parameters.AddRange(param);
 
		result = new DataTable();
		SqlDataReader reader = command.ExecuteReader();
		if (reader.HasRows)
			result.Load(reader);
 
		return Convert.ToInt32(command.Parameters["RETURN_VALUE"].Value);
	}
	catch (Exception)
	{
		result = null;
		return -1;
	}
	finally
	{
		DisConnect();
	}
}