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在.NET平臺(tái)下使用C#通過Thrift訪問Cassandra

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幾家做seo無恥公司名單

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http://www.byywee.com?
http://www.cosdiv.com

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通過在自已網(wǎng)站加入別人網(wǎng)站連接,這種網(wǎng)站專門對(duì)新開通的網(wǎng)站做連接,從而達(dá)到宣傳他們目的,

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http://www.renrenaj.com/about/copyright.html


1、下載Thrift

兩個(gè)文件:

thrift-0.7.0.tar.gz

Thrift compiler for Windows

2、獲取Thrift.dll

解壓后,找到源代碼:

thrift-0.7.0\lib\csharp\src,在Visual Studio中打開Thrift.csproj,重新編譯生成dll。

3、生成C#代碼

將thrift-0.7.0.exe復(fù)制到Cassandra安裝目錄的interface目錄中。

在命令提示符工具中進(jìn)入interface目錄,執(zhí)行以下命令:

    thrift-0.7.0.exe --gen csharp cassandra.thrift
  

完畢后會(huì)在這個(gè)目錄中生成一個(gè)文件夾:gen-csharp。

4、獲取Apache.Cassandra.dll

新建一個(gè)類庫項(xiàng)目,把這些文件加到這個(gè)項(xiàng)目中,編譯生成一個(gè)dll文件。

cassandra thrift 在.NET平臺(tái)下使用C#通過Thrift訪問Cassandra

別忘了添加引用上邊生成的Thrift.dll文件。

5、編寫測(cè)試程序

在Visual Studio中創(chuàng)建一個(gè)項(xiàng)目,這里以用戶令牌為例,給出兩個(gè)方法:

(1)、插入數(shù)據(jù)

    public string SetUserToken()

        {

            string keySpaceName = "UserTokenSpace";

            string columnFamilyName = "UserToken";

            string columnName = "Token";

            string key = "1001";

            string token = "we9g872m9f5l";

            Encoding utf8Encoding = Encoding.UTF8;

            long timeStamp = DateTime.Now.Ticks;



            TTransport frameTransport = null;

            try

            {

                // 通過Thrift建立到Cassandra的連接

                frameTransport = new TFramedTransport(new TSocket("localhost", 9160));

                TProtocol protocol = new TBinaryProtocol(frameTransport);

                TProtocol frameProtocol = new TBinaryProtocol(frameTransport);

                Cassandra.Client client = new Cassandra.Client(protocol, frameProtocol);

                frameTransport.Open();



                // 先刪除已經(jīng)創(chuàng)建的KeySpace,以便于測(cè)試

                try

                {

                    client.system_drop_keyspace(keySpaceName);

                }

                catch

                {

                }



                // KeySpace 定義

                KsDef ks = new KsDef()

                {

                    Name = keySpaceName,

                    Replication_factor = 1,

                    Strategy_class = "org.apache.cassandra.locator.SimpleStrategy",



                    // Column Family 定義

                    Cf_defs = new List<CfDef>() {

                        new CfDef(){

                                        Name = columnFamilyName,

                                        Keyspace = keySpaceName,

                                        Comparator_type = "BytesType",



                                        // Column 定義

                                        Column_metadata = new List<ColumnDef>(){

                                            new ColumnDef(){

                                                Index_name = columnName,

                                                Index_type = IndexType.KEYS,

                                                Name = utf8Encoding.GetBytes("Token"),

                                                Validation_class = "BytesType"

                                            }

                                        }

                                    }

                    }

                };



                // 添加KeySpace

                client.system_add_keyspace(ks);



                //設(shè)置當(dāng)前KeySpace

                client.set_keyspace(keySpaceName);



                // 要插入數(shù)據(jù)的路徑

                ColumnParent tokenColumnParent = new ColumnParent()

                {

                    Column_family = columnFamilyName

                };



                // 要插入數(shù)據(jù)的Column

                Column tokenColume = new Column()

                {

                    Name = utf8Encoding.GetBytes(columnName),

                    Value = utf8Encoding.GetBytes(token),

                    Timestamp = timeStamp

                };



                //插入數(shù)據(jù)

                client.insert(utf8Encoding.GetBytes(key), tokenColumnParent, tokenColume, ConsistencyLevel.ONE);

            }

            finally

            {

                if (frameTransport != null)

                {

                    frameTransport.Close();

                }

            }



            return token;

        }
  

(2)、獲取數(shù)據(jù)

    public static string GetUserToken(string userId)

        {

            string keySpaceName = "UserTokenSpace";

            string columnFamilyName = "UserToken";

            string columnName = "Token";

            System.Text.Encoding utf8Encoding = System.Text.Encoding.UTF8;

            long timeStamp = DateTime.Now.Millisecond;



            TTransport frameTransport = null;

            try

            {

                // 通過Thrift建立到Cassandra的連接

                frameTransport = new TFramedTransport(new TSocket("localhost", 9160));

                TProtocol protocol = new TBinaryProtocol(frameTransport);

                TProtocol frameProtocol = new TBinaryProtocol(frameTransport);

                Cassandra.Client client = new Cassandra.Client(protocol, frameProtocol);

                frameTransport.Open();



                // 設(shè)置當(dāng)前KeySpace

                client.set_keyspace(keySpaceName);



                // 查找路徑

                ColumnPath nameColumnPath = new ColumnPath()

                {

                    Column_family = columnFamilyName,

                    Column = utf8Encoding.GetBytes(columnName)

                };



                // 獲取Column

                ColumnOrSuperColumn returnedColumn = client.get(utf8Encoding.GetBytes(userId), nameColumnPath, ConsistencyLevel.ONE);

                return utf8Encoding.GetString(returnedColumn.Column.Value);

            }

            catch

            {

            }

            finally

            {

                // 別忘了關(guān)閉連接

                if (frameTransport != null)

                {

                    frameTransport.Close();

                }

            }



            return string.Empty;

        }
  

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使用ThriftAPI進(jìn)行數(shù)據(jù)操作還是很繁瑣的,nosql的操作規(guī)范沒有sql那么好啊,不過效率肯定有保證。接下來的文章會(huì)介紹一些高級(jí)API的使用。

在.NET平臺(tái)下使用C#通過Thrift訪問Cassandra


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