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大家好！

我在网上看到了关于extremedb的文章，在实际操作时碰到了一些问题，想和大家探讨一下。

1、我先安装了extremedb_3.1_win32_sql_log_eval_1B.EXE，

2、然后用安装目录（C:/McObject/eXtremeDB_SQL_LOG/win32/host/bin）下的mcocomp.exe对test.mco文件进行了编译，test.mco文件代码如下：

#define int1 signed<1>

#define int2 signed<2>

#define int4 signed<4>

#define int8 signed<8>

#define uint8 unsigned<8>

#define uint4 unsigned<4>

#define uint2 unsigned<2>

#define uint1 unsigned<1>

declare database testdb; //申明一个数据库定义名称

compact class Myclass //表名字

{

unsigned<4> id;

char<20> strnname;

string straddress;

unique tree<id> pkey; //索引

};

3、编译成功后生成了如下两个文件：testdb.c，testdb.h

testdb.c的代码如下：

/* Generated by eXtremeDB Schema Compiler, build 468

* at Fri Jul 31 09:44:42 2009

*/

#include “testdb.h”

#include “mcowrap.h”

/*———————————————————————*/

/* dictionary */

mco_dictionary_h testdb_get_dictionary(void)

{

static mco_dictionary_t dict;

static int dictionary_ready = 0;

if( ! dictionary_ready )

{

    static mco_dict_field_t v_field_info[3] = {

    /* Myclass */

    {“id”, {4, 4, 0, 4, 4, 0}, 3, 8, 0, -1, 4, -1, 0, 0, -1, 0 /* 1 */},

    {“straddress”, {2, 2, 4, 4, 4, 4}, 8, 0, 0, -1, 0, -1, 0, 2, -1, 0 /* 3 */},

    {“strnname”, {20, 1, 6, 20, 1, 8}, 7, 0, 0, -1, 20, -1, 0, 1, -1, 0 /* 2 */}

    };

    static mco_dict_struct_t v_struct_info[1] = {

    { “Myclass”, 1, 3, (v_field_info + 0), 26, 4, 28, 4 }

    };

dictionary_ready = 1;

    {

      static const char * v_class_names[] =

      {

        0,

        “Myclass”     , /* [1] */

        0

      };

dict.str_class_names = v_class_names;

}

    {

      static const char * v_index_names[] =

      {

        “Myclass.pkey”     , /* [0] */

        0

      };

dict.str_index_names = v_index_names;

}

    {

      static mco_dict_class_info_t class_inf[2] = {

        { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },

        { 0, 0, -1, -1, 0, 0, -1, 0, 0, -1, -2, 8, (v_struct_info + 0), 26, 0, -1, -1, -1 } /* Myclass */

      };

      dict.v_class_info = class_inf;

    }

dict.v_desc_events = (mco_dict_event_t *)0;

    dict.v_all_struct = v_struct_info;

    {

      static mco_dict_index_field_t v_all_index_fields[ 1] = {

          { 0, -1, 4, 3, 0, 1 } /* [0] id */

      };

      static mco_dict_index_t v_all_indexes_info[ 1] = {

          { 1, 1, -1, 2051, & v_all_index_fields[0], 0 } /* Myclass.pkey [0] */

      };

dict.v_desc_indexes = v_all_indexes_info;

}

    dict.version_major             = 3;

    dict.version_minor             = 1;

    dict.version_build             = 468;

    dict.magic_number              = 7;

    dict.oid_is_supported          = 0;

    dict.auto_oid_supported        = 0;

    dict.flags                     = 0;

    dict.n_class_codes             = 1;

    dict.n_list_indexes            = 0;

    dict.n_autoid_indexes          = 0;

    dict.n_history_indexes         = 0;

    dict.n_desc_indexes            = 1;

    dict.n_desc_events             = 0;

    dict.n_structs                 = 1;

    dict.num_oid_estimation        = 0;

    dict.num_HA_estimation         = 0;

    dict.max_numof_indexes_per_obj = 1;

    dict.exact_OID_sizeof          = 0;

    dict.layout_OID_size           = 0;

}

return &dict;

}

MCO_RET Myclass_new ( mco_trans_h t, /*OUT*/ Myclass *handle )

{ return mco_w_new_obj_noid( t, 26, 1, (mco_objhandle_h)handle);

}

MCO_RET Myclass_delete ( Myclass *handle )

{ return mco_w_obj_delete( (mco_objhandle_h)handle);

}

MCO_RET Myclass_delete_all ( mco_trans_h t )

{ return mco_w_obj_delete_all( t, 1 );

}

MCO_RET Myclass_checkpoint ( Myclass *handle )

{ return mco_w_obj_checkpoint( (mco_objhandle_h)handle );

}

MCO_RET Myclass_pack ( Myclass *handle, /*OUT*/ uint4 * pages_released )

{ return mco_w_compact( (mco_objhandle_h)handle, 1, 0, pages_released);

}

MCO_RET Myclass_id_get ( Myclass *handle, /*OUT*/ uint4 * result)

{ return mco_w_b4_get( (mco_objhandle_h) handle, 0, result);

}

MCO_RET Myclass_id_put ( Myclass *handle, uint4 value )

{ return mco_w_b4_put( (mco_objhandle_h) handle, 0, 1, *(uint4*)& value);

}

MCO_RET Myclass_strnname_get ( Myclass *handle, /*OUT*/ char * dest, uint2 dest_size)

{ return mco_w_chars_get2( (mco_objhandle_h) handle, 8, 6, dest, dest_size, 20);

}

MCO_RET Myclass_strnname_put ( Myclass *handle, const char * src, uint2 len)

{ return mco_w_chars_put2( (mco_objhandle_h)handle, 8, 6, src, len, 20, 0);

}

MCO_RET Myclass_straddress_get ( Myclass *handle, /*OUT*/ char * dest, uint2 dest_size, /*OUT*/ uint2 * len)

{ return mco_w_string_get2( (mco_objhandle_h) handle, 4, 4, dest, dest_size, len);

}

MCO_RET Myclass_straddress_size ( Myclass *handle, /*OUT*/ uint2 *result)

{ return mco_w_string_len2( (mco_objhandle_h) handle, 4, 4, result);

}

MCO_RET Myclass_straddress_put ( Myclass *handle, const char * src, uint2 len)

{ return mco_w_string_put2( (mco_objhandle_h) handle, 4, 4, src, len, 0);

}

MCO_RET Myclass_from_cursor ( mco_trans_h t, mco_cursor_h c, /*OUT*/ Myclass *handle )

{ return mco_w_obj_from_cursor( t, c, 1, (mco_objhandle_h)handle );

}

MCO_RET Myclass_pkey_index_cursor ( mco_trans_h t, /*OUT*/ mco_cursor_h c )

{ return mco_w_index_cursor( t, 0, c );

}

MCO_RET Myclass_pkey_search ( mco_trans_h t, /*INOUT*/ mco_cursor_h c, MCO_OPCODE op_, uint4 id )

{ mco_external_field_t a_ [1];

mco_external_field_h pa_ = a_;

pa_->field_type = 3; pa_->v.u4 = id;

return mco_w_tree_find(t,c,op_,a_);

}

MCO_RET Myclass_pkey_compare ( mco_trans_h t, mco_cursor_h c, uint4 id, /*OUT*/ int *result_ )

{ mco_external_field_t a_[1];

mco_external_field_h pa_ = a_;

pa_->field_type = 3; pa_->v.u4 = id;

return mco_w_cursor_compare( t, c, a_, result_);

}

MCO_RET Myclass_pkey_pattern_size ( uint4 id, /*OUT*/ uint4 *size_)

{ mco_external_field_t a_ [2];

mco_external_field_h pa_ = a_;

pa_->field_type = 3; pa_->v.u4 = id;

(pa_+1)->field_type=0;

*size_=mco_w_pattern_size(0, a_);

return MCO_S_OK;

}

MCO_RET Myclass_pkey_pattern_search ( mco_trans_h t, /*INOUT*/ void *allocated_pattern, uint4 memsize, /*OUT*/ Myclass *obj, uint4 id )

{ mco_external_field_t a_ [2];

mco_external_field_h pa_ = a_;

pa_->field_type = 3; pa_->v.u4 = id;

(pa_+1)->field_type=0;

return mco_w_pattern_search(t, 0, allocated_pattern, memsize, (mco_objhandle_h )obj, a_);

}

MCO_RET Myclass_pkey_pattern_next ( mco_trans_h t, /*INOUT*/ void *allocated_pattern, /*OUT*/ Myclass *obj)

{ return mco_w_pattern_next(t, 0 , allocated_pattern, (mco_objhandle_h) obj, 0);

}

MCO_RET Myclass_pkey_locate ( mco_trans_h t, /*OUT*/ mco_cursor_h c, Myclass * handle)

{ return mco_w_cursor_locate( t, 0, (mco_objhandle_h)handle, c);

}

MCO_RET Myclass_pkey_find ( mco_trans_h t, uint4 id, /*OUT*/ Myclass *handle_)

{ mco_external_field_t a_[1];

mco_external_field_h pa_ = a_;

pa_->field_type = 3; pa_->v.u4 = id;

return mco_w_tree_find_scalar(t, 0, a_, (mco_objhandle_h)handle_);

}

testdb.h的代码如下：

/* Generated by eXtremeDB Schema Compiler, build 468

* at Fri Jul 31 09:44:42 2009

*/

#ifndef __MCO__testdb__H__

#define __MCO__testdb__H__

#ifndef MCO_CFG_WCHAR_SUPPORT

#define MCO_CFG_WCHAR_SUPPORT

#include <wchar.h>

#endif

#ifdef __cplusplus

extern “C” {

#endif

#include “mco.h”

#define MCO_COMP_VER_MAJOR 3

#define MCO_COMP_VER_MINOR 1

#define MCO_COMP_BUILD_NUM 468

/*———————————————————————*/

/* Handles and Class Codes */

typedef struct Myclass_ { MCO_Hf h; } Myclass;

#define Myclass_code 1

/*———————————————————————*/

/* Dictionary */

mco_dictionary_h testdb_get_dictionary(void);

/*———————————————————————*/

/* class Myclass methods */

MCO_RET Myclass_new                           ( mco_trans_h t, /*OUT*/ Myclass *handle );

MCO_RET Myclass_delete                        ( Myclass *handle );

MCO_RET Myclass_delete_all                    ( mco_trans_h t );

MCO_RET Myclass_checkpoint                    ( Myclass *handle );

MCO_RET Myclass_pack                          ( Myclass *handle, /*OUT*/ uint4 * pages_released );

MCO_RET Myclass_id_get ( Myclass *handle, /*OUT*/ uint4 * result);

MCO_RET Myclass_id_put ( Myclass *handle, uint4 value );

MCO_RET Myclass_strnname_get ( Myclass *handle, /*OUT*/ char * dest, uint2 dest_size);

MCO_RET Myclass_strnname_put ( Myclass *handle, const char * src, uint2 len) ;

MCO_RET Myclass_straddress_get                ( Myclass *handle, /*OUT*/ char * dest, uint2 dest_size, /*OUT*/ uint2 * len);

MCO_RET Myclass_straddress_size               ( Myclass *handle, /*OUT*/ uint2 *result);

MCO_RET Myclass_straddress_put                ( Myclass *handle, const char * src, uint2 len);

MCO_RET Myclass_from_cursor ( mco_trans_h t, mco_cursor_h c, /*OUT*/ Myclass *handle );

MCO_RET Myclass_pkey_index_cursor             ( mco_trans_h t, /*OUT*/ mco_cursor_h c );

MCO_RET Myclass_pkey_search                   ( mco_trans_h t, /*INOUT*/ mco_cursor_h c, MCO_OPCODE op_, uint4 id );

MCO_RET Myclass_pkey_compare                  ( mco_trans_h t, mco_cursor_h c, uint4 id, /*OUT*/ int *result_ );

MCO_RET Myclass_pkey_pattern_size            ( uint4 id, /*OUT*/ uint4 *size_);

MCO_RET Myclass_pkey_pattern_search           ( mco_trans_h t, /*INOUT*/ void *allocated_pattern, uint4 memsize, /*OUT*/ Myclass *obj, uint4 id );

MCO_RET Myclass_pkey_pattern_next             ( mco_trans_h t, /*INOUT*/ void *allocated_pattern, /*OUT*/ Myclass *obj);

MCO_RET Myclass_pkey_locate                   ( mco_trans_h t, /*OUT*/ mco_cursor_h c, Myclass * handle);

MCO_RET Myclass_pkey_find                     ( mco_trans_h t, uint4 id, /*OUT*/ Myclass *handle_);

#ifdef __cplusplus

} // extern “C”

#endif

#endif

4、然后用VC++6.0新建了一个工程Myproject，并把testdb.c，testdb.h拷到了该工程目录下，然后将testdb.c，testdb.h加入到该工程

5、接着设置了Myproject，

(1)在project/setting中选择link，将category选为general，在其后加入mcolib_shm.lib，并将mcolib_shm.lib拷到Myproject目录中

(2)在project/setting中选择C/C++,将category选为code generation，

将use run-time library选为debug multithreaded dll

6、新建一个源文件Mytest.c，代码如下：

#include<ctype.h>

#include<stdlib.h>

#include<stdio.h>

#include<string.h>

#include “testdb.h”

const char *dbname=”demo ShmDb”;

const int SEGSZ=1024*1024*10;

const uint2 PAGESIZE=90;

const int MAP_ADDRESS=0x200000000;

void SH(void)

{

char test[]={“嵌入式实时数据库演示/n”};

char text1[]={“Copyright(c)2001-2005 Mcobject LLC.All Right Reserved./n”};

printf(“%s/n eXtremeDB runtime version %d.%d,build %d/n %s/n/n Press Enter to Start”,text,MCO_COMP_VER_MAJOR,MCO_COMP_VER_MINOR,MCO_COMP_BUILD_NUM,text1);

getchar();

}

static int askNumber(const char *prompt)

{

char buf[100];

printf(“/n%s”,prompt);

fgets(buf,sizeof(buf),stdin);

if(isdigit(buf[0]))

return atoi(buf);

return -1;

}

static char *askString(const char *prompt)

{

char buf[300];

static char buf1[300];

printf(“/n%s”,prompt);

}

7、然后编译，提示错误：

——————–Configuration: Myproject – Win32 Debug——————–

Compiling…

Mytest.c

C:/123/Myproject/Mytest.c(9) : warning C4305: ‘initializing’ : truncation from ‘const __int64 ‘ to ‘const int ‘

C:/123/Myproject/Mytest.c(28) : warning C4101: ‘buf’ : unreferenced local variable

Linking…

LINK : warning LNK4098: defaultlib “MSVCRT” conflicts with use of other libs; use /NODEFAULTLIB:library

MSVCRTD.lib(crtexe.obj) : error LNK2001: unresolved external symbol _main

Debug/Myproject.exe : fatal error LNK1120: 1 unresolved externals

执行 link.exe 时出错.

Myproject.exe – 1 error(s), 0 warning(s)

小结：我估计是Mytest.c写得不完整，这个代码是在一个帖子里看到的，里面没有main函数。

请问大家能能写出一个完整的Mytest.c吗？然后给我发过来吗？我现在水平有限，目前只能照搬别人的代码，只是想先按照提示做出点东西。

期待着大家的回复！谢谢了！

发布者：全栈程序员-站长，转载请注明出处：https://javaforall.net/181980.html原文链接：https://javaforall.net

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