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();
             }
         }
     }
 }