关于extreme sports的作文_grantable

尊敬的前辈，

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！

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