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JAVA

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H5TB_MAKE_TABLE

Creates and writes a table

Procedure:

H5TB_MAKE_TABLE ( table_title, loc_id, table_name, nfields, nrecords, type_size, field_names, field_offset, field_types, chunk_size, fill_data, compress, data )

Signature:

herr_t H5TBmake_table( const char *table_title, hid_t loc_id, const char *dset_name, hsize_t nfields, 
     const hsize_tnrecords, size_t type_size, const char *field_names [ ], const size_t *field_offset, 
     const hid_t *field_types, hsize_tchunk_size, void *fill_data, int compress, const void *data )

subroutine h5tbmake_table_f(table_title, loc_id, dset_name, nfields, &
                            nrecords, type_size, field_names, field_offset, &
                            field_types, chunk_size, compress, errcode) 
  implicit none
  character(LEN=*), intent(IN) :: table_title     ! name of the table
  integer(HID_T), intent(IN) :: loc_id            ! file or group identifier 
  character(LEN=*), intent(IN) :: dset_name       ! name of the dataset 
  integer(HSIZE_T), intent(IN) :: nfields         ! fields 
  integer(HSIZE_T), intent(IN) :: nrecords        ! records
  integer(SIZE_T), intent(IN) :: type_size        ! type size
  character(LEN=*), dimension(nfields), intent(IN) :: field_names
                                                  ! field names
  integer(SIZE_T), dimension(nfields), intent(IN) :: field_offset
                                                  ! field offset
  integer(HID_T), dimension(nfields), intent(IN) :: field_types
                                                  ! field types
  integer(HSIZE_T), intent(IN) :: chunk_size      ! chunk size
  integer, intent(IN) :: compress                 ! compress
  integer :: errcode                              ! error code
end subroutine h5tbmake_table_f

Note: h5tbmake_table_f only creates the table, it does not write data to it.

Parameters:
const char *table_titleIN: The title of the table
hid_t loc_idIN: Identifier of the file or group to create the table within
const char *table_nameIN: The name of the dataset to create
hsize_t nfieldsIN: The number of fields
const hsize_t nrecordsIN: The number of records
hsize_t type_size

IN: The size in bytes of the structure associated with the table

This value is obtained with sizeof.

const char *field_names[]    IN: An array containing the names of the fields
const size_t *field_offsetIN: An array containing the offsets of the fields
const hid_t *field_typesIN: An array containing the type of the fields
hsize_t chunk_sizeIN: The chunk size
void *fill_dataIN: Fill values data
int compressIN: Flag that turns compression on or off
const void *dataIN: Buffer with data to be written to the table

Description:

 H5TB_MAKE_TABLE creates and writes a dataset named table_name attached to the object specified by the identifier loc_id.

Returns:

Returns a non-negative value if successful; otherwise returns a negative value.

Example:

hl / examples / ex_table_01.c [34:102]  1.10/master  HDFFV/hdf5
 typedef struct Particle
 {
  char   name[16];
  int    lati;
  int    longi;
  float  pressure;
  double temperature;
 } Particle;

 Particle  dst_buf[NRECORDS];

 /* Calculate the size and the offsets of our struct members in memory */
 size_t dst_size =  sizeof( Particle );
 size_t dst_offset[NFIELDS] = { HOFFSET( Particle, name ),
                                HOFFSET( Particle, lati ),
                                HOFFSET( Particle, longi ),
                                HOFFSET( Particle, pressure ),
                                HOFFSET( Particle, temperature )};

 size_t dst_sizes[NFIELDS] = { sizeof( dst_buf[0].name),
                               sizeof( dst_buf[0].lati),
                               sizeof( dst_buf[0].longi),
                               sizeof( dst_buf[0].pressure),
                               sizeof( dst_buf[0].temperature)};


 /* Define an array of Particles */
 Particle  p_data[NRECORDS] = {
 {"zero",0,0, 0.0f, 0.0},
 {"one",10,10, 1.0f, 10.0},
 {"two",  20,20, 2.0f, 20.0},
 {"three",30,30, 3.0f, 30.0},
 {"four", 40,40, 4.0f, 40.0},
 {"five", 50,50, 5.0f, 50.0},
 {"six",  60,60, 6.0f, 60.0},
 {"seven",70,70, 7.0f, 70.0}
  };

  /* Define field information */
  const char *field_names[NFIELDS]  =
  { "Name","Latitude", "Longitude", "Pressure", "Temperature" };
  hid_t      field_type[NFIELDS];
  hid_t      string_type;
  hid_t      file_id;
  hsize_t    chunk_size = 10;
  int        *fill_data = NULL;
  int        compress  = 0;
  int        i;

  /* Initialize field_type */
  string_type = H5Tcopy( H5T_C_S1 );
  H5Tset_size( string_type, 16 );
  field_type[0] = string_type;
  field_type[1] = H5T_NATIVE_INT;
  field_type[2] = H5T_NATIVE_INT;
  field_type[3] = H5T_NATIVE_FLOAT;
  field_type[4] = H5T_NATIVE_DOUBLE;

  /* Create a new file using default properties. */
  file_id = H5Fcreate( "ex_table_01.h5", H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT );

/*-------------------------------------------------------------------------
 * H5TBmake_table
 *-------------------------------------------------------------------------
 */

 H5TBmake_table( "Table Title", file_id, TABLE_NAME,NFIELDS,NRECORDS,
                         dst_size,field_names, dst_offset, field_type,
                         chunk_size, fill_data, compress, p_data  );

  !-------------------------------------------------------------------------
  ! make table
  ! initialize the table parameters
  !-------------------------------------------------------------------------

  field_names(1) = "field1"
  field_names(2) = "field2a"
  field_names(3) = "field3ab"
  field_names(4) = "field4abc"

  !
  ! calculate total size by calculating sizes of each member
  !
  CALL h5tcopy_f(H5T_NATIVE_CHARACTER, type_id_c, errcode)
  type_size = 2
  CALL h5tset_size_f(type_id_c, type_size, errcode)
  CALL h5tget_size_f(type_id_c, type_sizec, errcode)
  CALL h5tget_size_f(H5T_NATIVE_INTEGER, type_sizei, errcode)
  IF(exclude_double)THEN
     CALL h5tget_size_f(H5T_NATIVE_REAL, type_sized, errcode)
  ELSE
     CALL h5tget_size_f(H5T_NATIVE_DOUBLE, type_sized, errcode)
  ENDIF
  CALL h5tget_size_f(H5T_NATIVE_REAL, type_sizer, errcode)
  type_size = type_sizec + type_sizei + type_sized + type_sizer

  !
  ! type ID's
  !
  field_types(1) = type_id_c
  field_types(2) = H5T_NATIVE_INTEGER
  IF(exclude_double)THEN
     field_types(3) = H5T_NATIVE_REAL
  ELSE
     field_types(3) = H5T_NATIVE_DOUBLE
  ENDIF
  field_types(4) = H5T_NATIVE_REAL

  !
  ! offsets
  !
  offset = 0
  field_offset(1) = offset
  offset = offset + type_sizec ! Offset of the second memeber is 2
  field_offset(2) = offset
  offset = offset + type_sizei ! Offset of the second memeber is 6
  field_offset(3) = offset
  offset = offset + type_sized ! Offset of the second memeber is 14
  field_offset(4) = offset

  !-------------------------------------------------------------------------
  ! make table
  !-------------------------------------------------------------------------

  test_txt = "Make table"
  CALL test_begin(test_txt)

  CALL h5tbmake_table_f(dsetname1,&
       file_id,&
       dsetname1,&
       nfields,&
       nrecords,&
       type_size,&
       field_names,&
       field_offset,&
       field_types,&
       chunk_size,&
       compress,&
       errcode )

--- Last Modified: November 19, 2019 | 10:00 AM