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SQL Anywhere 12.0.1 » SQL Anywhere 服务器 - 编程 » 嵌入式 SQL » SQL 描述符区域 (SQLDA)

 

SQLDA 头文件

sqlda.h 的内容如下:



#ifndef _SQLDA_H_INCLUDED
#define _SQLDA_H_INCLUDED
#define II_SQLDA
#include "sqlca.h"
#if defined( _SQL_PACK_STRUCTURES )
  #if defined( _MSC_VER ) && _MSC_VER > 800
    #pragma warning(push)
    #pragma warning(disable:4103)
  #endif
  #include "pshpk1.h"
#endif
#define SQL_MAX_NAME_LEN    30
#define _sqldafar
typedef short int a_sql_type;

struct sqlname {
  short int   length; /* length of char data */
  char        data[ SQL_MAX_NAME_LEN ]; /* data */
};

struct sqlvar {          /* array of variable descriptors */
  short int   sqltype;   /* type of host variable */
  a_sql_len   sqllen;    /* length of host variable */
  void        *sqldata;  /* address of variable */
  a_sql_len   *sqlind;   /* indicator variable pointer */
  struct sqlname sqlname;
};

#if defined( _SQL_PACK_STRUCTURES )
  #include "poppk.h"
  /* The SQLDA should be 4-byte aligned */
  #include "pshpk4.h"
#endif

struct sqlda {
  unsigned char   sqldaid[8]; /* eye catcher "SQLDA" */
  a_sql_int32     sqldabc; /* length of sqlda structure */
  short int       sqln;    /* descriptor size in number of entries */
  short int       sqld;    /* number of variables found by DESCRIBE */
  struct sqlvar   sqlvar[1]; /* array of variable descriptors */
};

#define SCALE(sqllen)       ((sqllen)/256)
#define PRECISION(sqllen)   ((sqllen)&0xff)
#define SET_PRECISION_SCALE(sqllen,precision,scale)   \
                sqllen = (scale)*256 + (precision)
#define DECIMALSTORAGE(sqllen)  (PRECISION(sqllen)/2 + 1)
typedef struct sqlda    SQLDA;
typedef struct sqlvar   SQLVAR, SQLDA_VARIABLE;
typedef struct sqlname  SQLNAME, SQLDA_NAME;
#ifndef SQLDASIZE
#define SQLDASIZE(n)  ( sizeof( struct sqlda ) +  \
              (n-1) * sizeof( struct sqlvar) )
#endif
#if defined( _SQL_PACK_STRUCTURES )
  #include "poppk.h"
  #if defined( _MSC_VER ) && _MSC_VER > 800
    #pragma warning(pop)
  #endif
#endif
#endif