CUBRID学习笔记 40 使用net修改数据

修改

connection.Open();

  

 string queryString = "UPDATE nation set capital = 'X' where `code` = 'A'";

  

 CUBRIDCommand command = new CUBRIDCommand(queryString, connection);

 Int32 recordsAffected = command.ExecuteNonQuery();

删除

// Assumes connection is a valid SqlConnection.

connection.Open();

 

string queryString = "DELETE FROM nation where `code` = 'A'";

 

CUBRIDCommand command = new CUBRIDCommand(queryString, connection);

Int32 recordsAffected = command.ExecuteNonQuery();

 

 

写入blob类型数据

using CUBRID.Data.CUBRIDClient;

     

  namespace BLOBExample

  {

      class Program

      {

          static void Main(string[] args)

          {

              CUBRIDConnectionStringBuilder sb = new CUBRIDConnectionStringBuilder("localhost", "demodb", "public", "", "33000", true);

              using (CUBRIDConnection conn = new CUBRIDConnection(sb.GetConnectionString()))

              {

                  conn.Open();

     

                  string sql = "insert into Employees (Photo) values(?)";

                  using (CUBRIDCommand cmd = new CUBRIDCommand(sql, conn))

                  {

                      CUBRIDBlob Blob = new CUBRIDBlob(conn);

                      byte[] bytes;

                      BinaryReader _reader = new BinaryReader(File.Open(@".\John.jpg", FileMode.Open));

                      int length = (int)_reader.BaseStream.Length;

                      bytes = _reader.ReadBytes(length);

   

                      Blob.setBytes(1, bytes);

                      CUBRIDParameter param = new CUBRIDParameter();

                      param.ParameterName = "?";

                      param.CUBRIDDataType = CUBRIDDataType.CCI_U_TYPE_BLOB;

                      param.DbType = DbType.Binary;

                      param.Value = Blob;

 

                      cmd.Parameters.Add(param);

                      cmd.ExecuteNonQuery();

                  }

   

                  conn.Close();

              }

          }

      }

  }

 

 

写入clob数据

using CUBRID.Data.CUBRIDClient;

     

 namespace BLOBExample

 {

     class Program

     {

         static void Main(string[] args)

         {

             CUBRIDConnectionStringBuilder sb = new CUBRIDConnectionStringBuilder("localhost", "demodb", "public", "", "33000", true);

             using (CUBRIDConnection conn = new CUBRIDConnection(sb.GetConnectionString()))

             {

                 conn.Open();

     

                 string sql = "insert into Employees(resume) values(?)";

                 using (CUBRIDCommand cmd = new CUBRIDCommand(sql, conn))

                 {

                     StreamReader _reader = new StreamReader(File.Open(@".\John.txt", FileMode.Open));

                     string _resume = _reader.ReadToEnd();

                     _reader.Close();

 

                     CUBRIDBlob Blob = new CUBRIDBlob(conn);

                     Clob.setString(1, _resume);

 

                     CUBRIDParameter param = new CUBRIDParameter();

                     param.ParameterName = "?";

                     param.CUBRIDDataType = CUBRIDDataType.CCI_U_TYPE_CLOB;

                     param.Value = Blob;

                     cmd.Parameters.Add(param);

                     cmd.ExecuteNonQuery();

                     cmd.Close();

                 }

   

                 conn.Close();

             }

         }

     }

 }