hstmt.h

一个可以替代windows ODBC驱动程序管理器的通用ODBC数据库引擎

/*
 *  hstmt.h
 *
 *  $Id: hstmt.h,v 1.10 2000/02/01 12:54:03 source Exp $
 *
 *  Query statement object management functions
 *
 *  The iODBC driver manager.
 *  
 *  Copyright (C) 1995 by Ke Jin <[e-mail]> 
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Library General Public
 *  License as published by the Free Software Foundation; either
 *  version 2 of the License, or (at your option) any later version.
 *
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  Library General Public License for more details.
 *
 *  You should have received a copy of the GNU Library General Public
 *  License along with this library; if not, write to the Free
 *  Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
#ifndef	_HSTMT_H
#define	_HSTMT_H

typedef struct STMT
  {
    int type;			/* must be 1st field */
    HERR herr;
    SQLRETURN rc;		/* Return code of last function */

    struct STMT *next;

    HDBC hdbc;			/* back point to connection object */

    HSTMT dhstmt;		/* driver's stmt handle */

    int state;
    int cursor_state;
    int prep_state;
    int asyn_on;		/* async executing which odbc call */
    int need_on;		/* which call return SQL_NEED_DATA */

    int stmt_cip;		/* Call in progress on this handle */

#if (ODBCVER >= 0x0300)
    DESC_t FAR * imp_desc[4];
    DESC_t FAR * desc[4];
    SQLUINTEGER row_array_size, rowset_size;
    SQLPOINTER fetch_bookmark_ptr, params_processed_ptr;
    SQLUINTEGER paramset_size;
    SQLPOINTER row_status_ptr;
    SQLPOINTER rows_fetched_ptr;
    SQLUSMALLINT row_status_allocated;
#endif

  }
STMT_t;

#define IS_VALID_HSTMT(x) \
	((x) != SQL_NULL_HSTMT && \
	 ((STMT_t FAR *)(x))->type == SQL_HANDLE_STMT && \
	 ((STMT_t FAR *)(x))->hdbc != SQL_NULL_HDBC)


#define ENTER_STMT(pstmt) \
        ODBC_LOCK(); \
    	if (!IS_VALID_HSTMT (pstmt)) \
	  { \
	    ODBC_UNLOCK(); \
	    return SQL_INVALID_HANDLE; \
	  } \
	else if (pstmt->stmt_cip) \
          { \
	    PUSHSQLERR (pstmt->herr, en_S1010); \
	    ODBC_UNLOCK(); \
	    return SQL_ERROR; \
	  } \
	pstmt->stmt_cip = 1; \
	CLEAR_ERRORS (pstmt); \
        ODBC_UNLOCK(); \


#define LEAVE_STMT(pstmt, err) \
	pstmt->stmt_cip = 0; \
	return (err);
	
enum
  {
    en_stmt_allocated = 0,
    en_stmt_prepared,
    en_stmt_executed,
    en_stmt_cursoropen,
    en_stmt_fetched,
    en_stmt_xfetched,
    en_stmt_needdata,		/* not call SQLParamData() yet */
    en_stmt_mustput,		/* not call SQLPutData() yet */
    en_stmt_canput		/* SQLPutData() called */
  };				/* for statement handle state */

enum
  {
    en_stmt_cursor_no = 0,
    en_stmt_cursor_named,
    en_stmt_cursor_opened,
    en_stmt_cursor_fetched,
    en_stmt_cursor_xfetched
  };				/* for statement cursor state */


/*
 *  Internal prototypes
 */
SQLRETURN _iodbcdm_dropstmt ();

SQLRETURN SQL_API _iodbcdm_ExtendedFetch (
    SQLHSTMT hstmt, 
    SQLUSMALLINT fFetchType, 
    SQLINTEGER irow, 
    SQLUINTEGER FAR *pcrow, 
    SQLUSMALLINT FAR *rgfRowStatus);

SQLRETURN SQL_API _iodbcdm_SetPos (
    SQLHSTMT hstmt, 
    SQLUSMALLINT irow, 
    SQLUSMALLINT fOption, 
    SQLUSMALLINT fLock);

SQLRETURN SQL_API _iodbcdm_NumResultCols (
    SQLHSTMT hstmt,
    SQLSMALLINT FAR * pccol);
#endif