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1、下载Thrift
两个文件:
2、获取Thrift.dll
解压后,找到源代码:
thrift-0.7.0\lib\csharp\src,在Visual Studio中打开Thrift.csproj,重新编译生成dll。
3、生成C#代码
将thrift-0.7.0.exe复制到Cassandra安装目录的interface目录中。
在命令提示符工具中进入interface目录,执行以下命令:
thrift-0.7.0.exe --gen csharp cassandra.thrift
完毕后会在这个目录中生成一个文件夹:gen-csharp。
4、获取Apache.Cassandra.dll
新建一个类库项目,把这些文件加到这个项目中,编译生成一个dll文件。
别忘了添加引用上边生成的Thrift.dll文件。
5、编写测试程序
在Visual Studio中创建一个项目,这里以用户令牌为例,给出两个方法:
(1)、插入数据
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 { // 通过Thrift建立到Cassandra的连接 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(); // 先删除已经创建的KeySpace,以便于测试 try { client.system_drop_keyspace(keySpaceName); } catch { } // KeySpace 定义 KsDef ks = new KsDef() { Name = keySpaceName, Replication_factor = 1, Strategy_class = "org.apache.cassandra.locator.SimpleStrategy", // Column Family 定义 Cf_defs = new List<CfDef>() { new CfDef(){ Name = columnFamilyName, Keyspace = keySpaceName, Comparator_type = "BytesType", // Column 定义 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); //设置当前KeySpace client.set_keyspace(keySpaceName); // 要插入数据的路径 ColumnParent tokenColumnParent = new ColumnParent() { Column_family = columnFamilyName }; // 要插入数据的Column Column tokenColume = new Column() { Name = utf8Encoding.GetBytes(columnName), Value = utf8Encoding.GetBytes(token), Timestamp = timeStamp }; //插入数据 client.insert(utf8Encoding.GetBytes(key), tokenColumnParent, tokenColume, ConsistencyLevel.ONE); } finally { if (frameTransport != null) { frameTransport.Close(); } } return token; }
(2)、获取数据
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 { // 通过Thrift建立到Cassandra的连接 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(); // 设置当前KeySpace client.set_keyspace(keySpaceName); // 查找路径 ColumnPath nameColumnPath = new ColumnPath() { Column_family = columnFamilyName, Column = utf8Encoding.GetBytes(columnName) }; // 获取Column ColumnOrSuperColumn returnedColumn = client.get(utf8Encoding.GetBytes(userId), nameColumnPath, ConsistencyLevel.ONE); return utf8Encoding.GetString(returnedColumn.Column.Value); } catch { } finally { // 别忘了关闭连接 if (frameTransport != null) { frameTransport.Close(); } } return string.Empty; }
使用ThriftAPI进行数据操作还是很繁琐的,nosql的操作规范没有sql那么好啊,不过效率肯定有保证。接下来的文章会介绍一些高级API的使用。