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: http://www.stsci.edu/~sontag/spicedocs/cspice/ekccnt_c.html
Дата изменения: Sat Dec 17 06:08:51 2005 Дата индексирования: Mon Apr 11 00:00:31 2016 Кодировка: Поисковые слова: m 63 |
Return the number of distinct columns in a specified, currently loaded table
EK
Variable I/O Description -------- --- -------------------------------------------------- table I Name of table. ccount O Count of distinct, currently loaded columns.
table is the name of a currently loaded table. Case is not significant in the table name.
ccount is the number of distinct columns in table. Columns that have the same name but belong to different segments that are considered to be portions of the same column, if the segments containing those columns belong to table.
None.
This routine is a utility intended for use in conjunction with the entry point ekcii_c. These routines can be used to find the names and attributes of the columns that are currently loaded.
1) Dump the names and attributes of the columns in each loaded table. ekccnt_c is used to obtain column counts. #include "SpiceUsr.h" #include "SpiceEK.h" #define FILEN 256 SpiceChar colnam [ SPICE_EK_CSTRLN ]; SpiceChar ek [ FILEN ]; SpiceChar tabnam [ SPICE_EK_TSTRLN ]; SpiceChar * typstrs [ 4 ] = { "CHR", "DP", "INT", "TIME" }; SpiceEKAttDsc attdsc; SpiceInt i; SpiceInt ncols; SpiceInt ntab; SpiceInt tab; prompt_c ( "Enter name of EK to examine > ", FILEN, ek ); furnsh_c ( ek ); /. Get the number of loaded tables. ./ ekntab_c ( &ntab ); for ( tab = 0; tab < ntab; tab++ ) { /. Get the name of the current table, and look up the column count for this table. ./ ektnam_c ( tab, SPICE_EK_TSTRLN, tabnam ); ekccnt_c ( tabnam, &ncols ); printf ( "Table = %s\n\n", tabnam ); /. For each column in the current table, look up the column's attributes. The attribute block index parameters are defined in the include file ekattdsc.inc. ./ for ( i = 0; i < ncols; i++ ) { ekcii_c ( tabnam, i, SPICE_EK_CSTRLN, colnam, &attdsc ); printf ( "Column = %s\n", colnam ); /. Write out the current column's data type. ./ printf ( "Type = %s\n", typstrs[(int)attdsc.dtype] ); if ( attdsc.dtype == SPICE_CHR ) { if ( attdsc.strlen == SPICE_EK_VARSIZ ) { printf ( "String length = VARIABLE\n" ); } else { printf ( "String length = %ld\n", (SpiceInt) attdsc.strlen ); } } /. Write out the current column's entry size. ./ printf ( "Size = %ld\n", attdsc.size ); /. Indicate whether the current column is indexed. ./ if ( attdsc.indexd == SPICETRUE ) { printf ( "Indexed.\n" ); } else { printf ( "Not indexed.\n" ); } /. Indicate whether the current column allows null values. ./ if ( attdsc.nullok == SPICETRUE ) { printf ( "Null values allowed.\n" ); } else { printf ( "Null values not allowed.\n" ); } } /. We're done with the current column. ./ } /. We're done with the current table. ./
None.
1) If the specified table is not loaded, the error SPICE(TABLENOTLOADED) is signaled. 2) If the input string pointer is null, the error SPICE(NULLPOINTER) will be signaled. 3) If the input string has length zero, the error SPICE(EMPTYSTRING) will be signaled.
This routine reads binary "sequence component" EK files. In order for a binary EK file to be accessible to this routine, the file must be loaded via a call to furnsh_c or the low-level EK loader eklef_c.
N.J. Bachman (JPL)
None.
-CSPICE Version 1.0.0, 14-OCT-2001 (NJB)
return the number of loaded EK columns return the count of loaded EK columns