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6852741c18
1) Prepare to separate 4 kinds of Descriptor handles. 2) Detect the transaction status more naturally. 3) Improve Parse Statement functionality for the use of updatable cursors. 4) Improve updatable cursors. 5) Implement SQLGetDescField() and improve SQLColAttribute(). 6) etc.
71 lines
2.0 KiB
C
71 lines
2.0 KiB
C
/* File: tuple.h
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*
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* Description: See "tuple.c"
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*
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* Important NOTE: The TupleField structure is used both to hold backend data and
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* manual result set data. The "set_" functions and the TupleNode
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* structure are only used for manual result sets by info routines.
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*
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* Comments: See "notice.txt" for copyright and license information.
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*
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*/
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#ifndef __TUPLE_H__
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#define __TUPLE_H__
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#include "psqlodbc.h"
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/* Used by backend data AND manual result sets */
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struct TupleField_
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{
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Int4 len; /* length of the current Tuple */
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void *value; /* an array representing the value */
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};
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/* Used ONLY for manual result sets */
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struct TupleNode_
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{
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struct TupleNode_ *prev,
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*next;
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TupleField tuple[1];
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};
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/* keyset(TID + OID) info */
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struct KeySet_
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{
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UWORD status;
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UWORD offset;
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UDWORD blocknum;
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UDWORD oid;
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};
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/* Rollback(index + original TID) info */
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struct Rollback_
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{
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UDWORD index;
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UDWORD blocknum;
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UWORD offset;
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};
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#define KEYSET_INFO_PUBLIC 0x07
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#define CURS_SELF_ADDING (1L << 3)
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#define CURS_SELF_DELETING (1L << 4)
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#define CURS_SELF_UPDATING (1L << 5)
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#define CURS_SELF_ADDED (1L << 6)
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#define CURS_SELF_DELETED (1L << 7)
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#define CURS_SELF_UPDATED (1L << 8)
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#define CURS_NEEDS_REREAD (1L << 9)
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/* These macros are wrappers for the corresponding set_tuplefield functions
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but these handle automatic NULL determination and call set_tuplefield_null()
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if appropriate for the datatype (used by SQLGetTypeInfo).
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*/
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#define set_nullfield_string(FLD, VAL) ((VAL) ? set_tuplefield_string(FLD, (VAL)) : set_tuplefield_null(FLD))
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#define set_nullfield_int2(FLD, VAL) ((VAL) != -1 ? set_tuplefield_int2(FLD, (VAL)) : set_tuplefield_null(FLD))
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#define set_nullfield_int4(FLD, VAL) ((VAL) != -1 ? set_tuplefield_int4(FLD, (VAL)) : set_tuplefield_null(FLD))
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void set_tuplefield_null(TupleField *tuple_field);
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void set_tuplefield_string(TupleField *tuple_field, char *string);
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void set_tuplefield_int2(TupleField *tuple_field, Int2 value);
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void set_tuplefield_int4(TupleField *tuple_field, Int4 value);
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#endif
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