Sqlite3.78移植到VxWorks6.6
|
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 drh@sqlite.org 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: %sn",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] = %sn",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 （编辑：李大同） 【声明】本站内容均来自网络，其相关言论仅代表作者个人观点，不代表本站立场。若无意侵犯到您的权利，请及时与联系站长删除相关内容! |