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     // 异步方式

     // 结果以事件回调方式返回

     Command command = new Command("/system/bin/ping",

             "-c", "", "-s", "",

             "www.baidu.com");

     Command.command(command, new Command.CommandListener() {

         @Override

         public void onCompleted(String str) {

             Log.i(TAG, "onCompleted：\n" + str);

         }

         @Override

         public void onCancel() {

             Log.i(TAG, "onCancel");

         }

         @Override

         public void onError() {

             Log.i(TAG, "onError");

         }

     });

 </pre>

 <pre class="prettyprint lang-C#">

 using System;

 using System.Collections;

 using System.Collections.Generic;

 using System.Configuration;

 using System.Data;

 using System.Data.SqlClient;

 using System.Linq;

 using System.Text;

 namespace Justin.FrameWork.Helper

 {

     /// <summary>

     /// Sql访问数据库帮助类

     /// </summary>

     public abstract class SqlHelper

     {

         /// <summary>

         /// 如"data source=.;initial catalog=PrivilegeDB;integrated security=True;multipleactiveresultsets=True;"

         /// </summary>

         public static string ConnStr = "";

         public static int CommandTimeout = ;

         private static Hashtable parmCache = Hashtable.Synchronized(new Hashtable());

         public static int ExecuteNonQuery(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)

         {

             SqlCommand cmd = new SqlCommand();

             using (SqlConnection connection = new SqlConnection(connectionString))

             {

                 PrepareCommand(cmd, connection, null, cmdType, cmdText, commandParameters);

                 int val = cmd.ExecuteNonQuery();

                 cmd.Parameters.Clear();

                 return val;

             }

         }

         public static int ExecuteNonQuery(SqlConnection connection, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)

         {

             SqlCommand cmd = new SqlCommand();

             PrepareCommand(cmd, connection, null, cmdType, cmdText, commandParameters);

             int val = cmd.ExecuteNonQuery();

             cmd.Parameters.Clear();

             return val;

         }

         public static int ExecuteNonQuery(SqlTransaction trans, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)

         {

             SqlCommand cmd = new SqlCommand();

             cmd.CommandTimeout = ;

             PrepareCommand(cmd, trans.Connection, trans, cmdType, cmdText, commandParameters);

             int val = cmd.ExecuteNonQuery();

             cmd.Parameters.Clear();

             return val;

         }

         public static SqlDataReader ExecuteReader(SqlConnection connection, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)

         {

             SqlCommand cmd = new SqlCommand();

             try

             {

                 PrepareCommand(cmd, connection, null, cmdType, cmdText, commandParameters);

                 SqlDataReader rdr = cmd.ExecuteReader(CommandBehavior.CloseConnection);

                 cmd.Parameters.Clear();

                 return rdr;

             }

             catch

             {

                 connection.Close();

                 throw;

             }

         }

         public static object ExecuteScalar(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)

         {

             SqlCommand cmd = new SqlCommand();

             using (SqlConnection connection = new SqlConnection(connectionString))

             {

                 PrepareCommand(cmd, connection, null, cmdType, cmdText, commandParameters);

                 object val = cmd.ExecuteScalar();

                 cmd.Parameters.Clear();

                 return val;

             }

         }

         public static object ExecuteScalar(SqlConnection connection, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)

         {

             SqlCommand cmd = new SqlCommand();

             PrepareCommand(cmd, connection, null, cmdType, cmdText, commandParameters);

             object val = cmd.ExecuteScalar();

             cmd.Parameters.Clear();

             return val;

         }

         public static DataTable ExecuteDataTable(SqlConnection connection, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)

         {

             SqlCommand cmd = new SqlCommand();

             PrepareCommand(cmd, connection, null, cmdType, cmdText, commandParameters);

             SqlDataAdapter MyAdapter = new SqlDataAdapter();

             MyAdapter.SelectCommand = cmd;

             DataSet ds = new DataSet();

             MyAdapter.Fill(ds);

             cmd.Parameters.Clear();

             DataTable table = ds.Tables[];

             ds.Dispose();

             return table;

         }

         public static DataTable ExecuteDataTable(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)

         {

             using (SqlConnection connection = new SqlConnection(connectionString))

             {

                 SqlCommand cmd = new SqlCommand();

                 try

                 {

                     PrepareCommand(cmd, connection, null, cmdType, cmdText, commandParameters);

                     SqlDataAdapter MyAdapter = new SqlDataAdapter();

                     MyAdapter.SelectCommand = cmd;

                     DataSet ds = new DataSet();

                     MyAdapter.Fill(ds);

                     cmd.Parameters.Clear();

                     DataTable table = ds.Tables[];

                     ds.Dispose();

                     connection.Close();

                     return table;

                 }

                 catch

                 {

                     connection.Close();

                     throw;

                 }

             }

         }

         public static void CacheParameters(string cacheKey, params SqlParameter[] commandParameters)

         {

             parmCache[cacheKey] = commandParameters;

         }

         public static SqlParameter[] GetCachedParameters(string cacheKey)

         {

             SqlParameter[] cachedParms = (SqlParameter[])parmCache[cacheKey];

             if (cachedParms == null)

                 return null;

             SqlParameter[] clonedParms = new SqlParameter[cachedParms.Length];

             for (int i = , j = cachedParms.Length; i < j; i++)

                 clonedParms[i] = (SqlParameter)((ICloneable)cachedParms[i]).Clone();

             return clonedParms;

         }

         private static void PrepareCommand(SqlCommand cmd, SqlConnection connection, SqlTransaction trans, CommandType cmdType, string cmdText, SqlParameter[] cmdParms)

         {

             if (connection.State != ConnectionState.Open)

                 connection.Open();

             cmd.Connection = connection;

             cmd.CommandText = cmdText;

             cmd.CommandTimeout = CommandTimeout;

             if (trans != null)

                 cmd.Transaction = trans;

             cmd.CommandType = cmdType;

             if (cmdParms != null)

             {

                 foreach (SqlParameter parm in cmdParms)

                     cmd.Parameters.Add(parm);

             }

         }

         public static SqlConnection GetConnection(string connectionString)

         {

             return new SqlConnection(connectionString);

         }

     }

 }

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