移植sqlite3.78到VxWorks6.6是一个痛苦的过程，网上的资源也是少得可怜，功夫不负有心人，昨天自己通过windows与wxworks单步跟踪比较运行状况，折腾了几天的问题总算初步解决了，还有一些像线程互斥遗留问题日后解决吧。迷茫之时还特意向sqlite原作者请教，尽管从D. Richard Hipp那里没有得到帮助，这里我还是要感谢伟大的D. Richard Hipp:
A、第一封信
发件人：liuxuezong<liuxuezong@126.com>;
时 间：2011年09月28日 10:27 (星期三)
收件人：drh@hwaci.com
Dear D. Richard Hipp ,
Hello, I recently transplanted sqlie3 to vxworks6.6, encountered some problems, please help me, thank you! Means there is no problem with memory, the following is vxworks6.6 debugging error message:
1, sqlite3.3.7, debugging error: database is locked;
2, sqlite3.7.8, debugging error: disk i / o error.
liuxuezong
shanghai,china.
2011.09.28
B、第二封信
发件人：liuxuezong<liuxuezong@126.com>;
时 间：2011年09月28日 16:05 (星期三)
收件人：drh@hwaci.com
Dear D. Richard Hipp ,
hello, After debugging, I found the file control error s =- 1, leading to the above problem: database is locked!
...
lock.l_len = 1L;
lock.l_whence = SEEK_SET;
/* A PENDING lock is needed before acquiring a SHARED lock and before
** acquiring an EXCLUSIVE lock. For the SHARED lock, the PENDING will
** be released.
*/
if( locktype==SHARED_LOCK
|| (locktype==EXCLUSIVE_LOCK && pFile->locktype<PENDING_LOCK)
){
lock.l_type = (locktype==SHARED_LOCK?F_RDLCK:F_WRLCK);
lock.l_start = PENDING_BYTE;
s = fcntl(pFile->h, F_SETLK, &lock);
if( s ){
rc = (errno==EINVAL) ? SQLITE_NOLFS : SQLITE_BUSY;
goto end_lock;
}
}
...
liuxuezong
shanghai,china.
2011.09.28
C、Richard Hipp的回信
发件人：Richard Hipp<drh@sqlite.org>;(由 drhsqlite@gmail.com 代发)
时 间：2011年09月28日 17:57 (星期三)
收件人：liuxuezong <liuxuezong@126.com>;
Please send your requests to the SQLite mailing list. sqlite-users@sqlite.org. See http://www.sqlite.org/support.html for additional information.
2011/9/27 liuxuezong <liuxuezong@126.com>
- 显示引用文字 -
--
D. Richard Hipp
1、准备工作
首先从网上下载一个Sqlite Developer 3.8.5管理工具,SharpPlus Sqlite Developer, 强大的Sqlite3数据库管理程序，具有如下功能：
☆、强大的SQL编辑器
☆、Sqlite Sql语法高亮
☆、Sql编辑历史
☆、Sql关键字自动完成
☆、括号高亮匹配
☆、表，字段名自动完成
☆、自动SQL语法错误提示
☆、支持Unicode
☆、SQL代码格式化器
☆、支持ANSI，UTF8和UTF16数据编辑.
☆、可定制的数据类型映射.
☆、可执行分号分割的多条SQL语句.
☆、SQL执行监视器.
☆、可视化查询设计器.
☆、可视化表 ,视图 ,触发器和索引编辑.
☆、可按文本，16进制，HTML或者位图形式编辑数据.
☆、支持查看和编辑临时表，视图和触发器.
☆、支持查询计划.
☆、自动更新.
☆、可以将数据导出为sql,csv,excel, word, html, xml.
☆、可以导入csv文件.
☆、可以导出数据库的元数据.
☆、支持数据库元数据查找
☆、可以中断长时间查询
☆、支持Sqlite可加载扩展及虚拟表
☆、多语言支持(英语,简体中文，日语)
其次从sqlite官方网上http://www.sqlite.org/download.html下载一个Sqlite3.85开源代码，怎么下载应该比较简单了！
打开Sqlite Developer程序，上面的Sample.db将是我们测试的数据源，我们将利用该数据库的部门表见下图“DEPARTMENT”进行验证是否正确，安装之后把Sample.db文件拷贝至$(FEPHOME)/db/目录下，在$(FEPHOME)/code/目录新建文件夹sqlite378，把下载的sqlite3.78包中的sqlite3.h和sqlite3ext.h拷贝此处。
2、测试代码
// testSQlite378.cpp : Defines the entry point for the console application.
//
#include "stdafx.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "sqlite378/sqlite3.h" // $(FEPHOME)/code/inlcude/sqlite378
int main(int argc, char* argv[])
{
sqlite3 *db = NULL;
char *zErrMsg = 0;
int rc;
char *szWorkPath = "/e/openSUSE3000/fep/db/Sample.db3";
rc = sqlite3_open(szWorkPath, &db); // 打开指定的数据库文件.
if (rc)
{
fprintf(stderr, "Can't open database: %s\n", sqlite3_errmsg(db));
sqlite3_close(db);
return (1);
}
else
{
printf("You have opened a sqlite3 database named Sample.db3 successfully!\n");
}
int nrow = 0, ncolumn = 0;
char **azResult; // 二维数组存放结果
// 查询数据
char *sql = "SELECT * FROM DEPARTMENT";
sqlite3_get_table(db, sql , &azResult , &nrow , &ncolumn , &zErrMsg);
int i = 0 ;
printf("row:%d column=%d \n" , nrow , ncolumn);
printf("\nThe result of querying is : \n");
for (i = 0 ; i < ( nrow + 1 ) * ncolumn ; i++)
printf("azResult[%d] = %s\n", i , azResult[i]);
// 释放掉 azResult 的内存空间
sqlite3_free_table(azResult);
#ifdef _DEBUG_
printf("zErrMsg = %s \n", zErrMsg);
#endif
sqlite3_close(db); // 关闭数据库
return 0;
}
3、生成库代码libsqlite378
在生成库时需要一些配置，具体内容如下：
DEFINES:-DOS_VXWORKS=1 -D_HAVE_SQLITE_CONFIG_H -DSQLITE_THREADSAFE=0
OS_VXWORKS：说明使用操作系统VxWorks.
_HAVE_SQLITE_CONFIG_H：将使用配置文件“config.h”
#ifndef _CONFIG_H_ #define _CONFIG_H_ #define SQLITE_OMIT_LOAD_EXTENSION 1 // 不需要动态库支持 #define HAVE_UTIME // 使用utime函数而不是utimes函数 #include <semaphore.h> /* * 不使用VxWorks提供的POSIX标准中的互斥信号量递归接口,因为对于内核程序,POSIX支持* 的不是太好 */ #define SQLITE_HOMEGROWN_RECURSIVE_MUTEX 1 #include <vxWorks.h> #endif // _CONFIG_H_
SQLITE_THREADSAFE=<0 or 1 or 2>
This option controls whether or not code is included in SQLite to enable it to operate safely in a multithreaded environment. The default is SQLITE_THREADSAFE=1 which is safe for use in a multithreaded environment. When compiled with SQLITE_THREADSAFE=0
all mutexing code is omitted and it is unsafe to use SQLite in a multithreaded program. When compiled with SQLITE_THREADSAFE=2, SQLite can be used in a multithreaded program so long as no two threads attempt to use the same
database connection at the same time.
To put it another way, SQLITE_THREADSAFE=1 sets the default
threading mode to Serialized. SQLITE_THREADSAFE=2 sets the default
threading mode to Multi-threaded. And SQLITE_THREADSAFE=0 sets the
threading mode to Single-threaded.
The value of SQLITE_THREADSAFE can be determined at run-time using the
sqlite3_threadsafe() interface.
When SQLite has been compiled with SQLITE_THREADSAFE=1 or SQLITE_THREADSAFE=2 then the
threading mode can be altered at run-time using the
sqlite3_config() interface together with one of these verbs:
The SQLITE_OPEN_NOMUTEX and
SQLITE_OPEN_FULLMUTEX flags to
sqlite3_open_v2() can also be used to adjust the
threading mode of individual
database connections at run-time.
Note that when SQLite is compiled with SQLITE_THREADSAFE=0, the code to make SQLite threadsafe is omitted from the build. When this occurs, it is impossible to change the
threading mode at start-time or run-time.
See the threading mode documentation for additional information on aspects of using SQLite in a multithreaded environment.
3、调试代码testsqlite378
testsqlite378生成比较简单，具体可以看前面关于嵌入系统调试的内容了。
4、Console输出的内容:
You have opened a sqlite3 database named Sample.db3 successfully!
row:21 column=7
The result of querying is :
azResult[0] = DEPT_NO
azResult[1] = DEPARTMENT
azResult[2] = HEAD_DEPT
azResult[3] = MNGR_NO
azResult[4] = BUDGET
azResult[5] = LOCATION
azResult[6] = PHONE_NO
azResult[7] = 000
azResult[8] = Corporate Headquarters
azResult[9] =
azResult[10] = 105
azResult[11] = 1000000
azResult[12] = Monterey
azResult[13] = (408) 555-1234
azResult[14] = 100
azResult[15] = Sales and Marketing
azResult[16] = 000
azResult[17] = 85
azResult[18] = 2000000
azResult[19] = San Francisco
azResult[20] = (415) 555-1234
azResult[21] = 600
azResult[22] = Engineering
azResult[23] = 000
azResult[24] = 2
azResult[25] = 1100000
azResult[26] = Monterey
azResult[27] = (408) 555-1234
azResult[28] = 900
azResult[29] = Finance
azResult[30] = 000
azResult[31] = 46
azResult[32] = 400000
azResult[33] = Monterey
azResult[34] = (408) 555-1234
azResult[35] = 180
azResult[36] = Marketing
azResult[37] = 100
azResult[38] =
azResult[39] = 1500000
azResult[40] = San Francisco
azResult[41] = (415) 555-1234
azResult[42] = 620
azResult[43] = Software Products Div.
azResult[44] = 600
azResult[45] =
azResult[46] = 1200000
azResult[47] = Monterey
azResult[48] = (408) 555-1234
azResult[49] = 621
azResult[50] = Software Development
azResult[51] = 620
azResult[52] =
azResult[53] = 400000
azResult[54] = Monterey
azResult[55] = (408) 555-1234
azResult[56] = 622
azResult[57] = Quality Assurance
azResult[58] = 620
azResult[59] = 9
azResult[60] = 300000
azResult[61] = Monterey
azResult[62] = (408) 555-1234
azResult[63] = 623
azResult[64] = Customer Support
azResult[65] = 620
azResult[66] = 15
azResult[67] = 650000
azResult[68] = Monterey
azResult[69] = (408) 555-1234
azResult[70] = 670
azResult[71] = Consumer Electronics Div.
azResult[72] = 600
azResult[73] = 107
azResult[74] = 1150000
azResult[75] = Burlington VT
azResult[76] = (802) 555-1234
azResult[77] = 671
azResult[78] = Research and Development
azResult[79] = 670
azResult[80] = 20
azResult[81] = 460000
azResult[82] = Burlington VT
azResult[83] = (802) 555-1234
azResult[84] = 672
azResult[85] = Customer Services
azResult[86] = 670
azResult[87] = 94
azResult[88] = 850000
azResult[89] = Burlington VT
azResult[90] = (802) 555-1234
azResult[91] = 130
azResult[92] = Field Office: East Coast
azResult[93] = 100
azResult[94] = 11
azResult[95] = 500000
azResult[96] = Boston
azResult[97] = (617) 555-1234
azResult[98] = 140
azResult[99] = Field Office: Canada
azResult[100] = 100
azResult[101] = 72
azResult[102] = 500000
azResult[103] = Toronto
azResult[104] = (416) 677-1000
azResult[105] = 110
azResult[106] = Pacific Rim Headquarters
azResult[107] = 100
azResult[108] = 34
azResult[109] = 600000
azResult[110] = Kuaui
azResult[111] = (808) 555-1234
azResult[112] = 115
azResult[113] = Field Office: Japan
azResult[114] = 110
azResult[115] = 118
azResult[116] = 500000
azResult[117] = Tokyo
azResult[118] = 3 5350 0901
azResult[119] = 116
azResult[120] = Field Office: Singapore
azResult[121] = 110
azResult[122] =
azResult[123] = 300000
azResult[124] = Singapore
azResult[125] = 3 55 1234
azResult[126] = 120
azResult[127] = European Headquarters
azResult[128] = 100
azResult[129] = 36
azResult[130] = 700000
azResult[131] = London
azResult[132] = 71 235-4400
azResult[133] = 121
azResult[134] = Field Office: Switzerland
azResult[135] = 120
azResult[136] = 141
azResult[137] = 500000
azResult[138] = Zurich
azResult[139] = 1 211 7767
azResult[140] = 123
azResult[141] = Field Office: France
azResult[142] = 120
azResult[143] = 134
azResult[144] = 400000
azResult[145] = Cannes
azResult[146] = 58 68 11 12
azResult[147] = 125
azResult[148] = Field Office: Italy
azResult[149] = 120
azResult[150] = 121
azResult[151] = 400000
azResult[152] = Milan
azResult[153] = 2 430 39 39
从控制输出的内容，我们可以看出的结果与表格显示一致，那说明我们的移植成功了