Berkeley db 4520 移植到ARMWord格式文档下载.docx
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下面主要介绍一下它在我最近玩的uClinux上的移植过程。
HilyJiang
Email&
Gtalk:
hilyjiangatGmail
Blog:
下载页面：
我使用的是当前最新版的4.5.20（点击下载）。
linux:
/home/work/db#ll
总用量9078
drwxr-xr-x2rootroot802006-10-0812:
36.
drwxr-xr-x11rootroot11202006-10-0812:
33..
-r-xr-xr-x1rootusers92818942006-10-0812:
36db-4.5.20.tar.gz
（一）解压
/home/work/db#tar-zxfdb-4.5.20.tar.gz
/home/work/db#cddb-4.5.20/
/home/work/db/db-4.5.20#ls
.db_checkpointdb_upgradelibdb_javaREADME
..db_deadlockdb_verifyLICENSErep
btreedb_dumpdistlockrepmgr
build_unixdb_dump185docslogrpc_client
build_vxworksdb_hotbackupenvmod_db4rpc_server
build_windowsdbincexamples_cmpsequence
clibdbinc_autoexamples_cxxmutextcl
commondb_loadexamples_javaostest
cryptodbmfileopsos_vxworkstxn
cxxdb_printloghashos_windowsxa
dbdb_recoverhmacperl
db185dbreghsearchphp_db4
db_archivedb_statjavaqam
docs目录下有我们需要的文档，包括快速入门、各种语言的API手册等资料。
（二）配置和编译
建立一个脚本以方便配置。
由于unix/linux编译时的工作路径必须是build_unix，因此我们需要在build_unix目录下创建脚本。
我创建了一个名为myconfig的脚本，内容如下：
/home/work/db/db-4.5.20/build_unix#cat-nmyconfig
1#!
/bin/sh
2
3CC=arm-elf-gcc\
4CFLAGS="
-Os-D__uClinux__-fno-builtin-I/home/uClinux-dist/linux-2.4.x/include-I/home/uClinux-dist/lib/uClibc/include-I/home/uClinux-dist/lib/uClibc/include/../"
\
5LDFLAGS="
-Wl,-elf2flt-Wl,-move-rodata-L/home/uClinux-dist/lib/uClibc/lib-L/home/uClinux-dist/lib/uClibc/lib/../-lc"
6../dist/configure\
7--prefix=/home/work/db/Berkeley.DB\
8--build=i686-linux\
9--host=arm-elf-linux\
10--disable-cryptography\
11--disable-hash\
12--disable-queue\
13--disable-replication\
14--disable-statistics\
15--disable-verify\
16--disable-compat185\
17--disable-cxx\
18--disable-debug\
19--disable-debug_rop\
20--disable-debug_wop\
21--disable-diagnostic\
22--disable-dump185\
23--disable-java\
24--disable-mingw\
25--disable-o_direct\
26--disable-posixmutexes\
27--disable-pthread_api\
28--disable-rpc\
29--disable-smallbuild\
30--disable-tcl\
31--disable-test\
32--disable-uimutexes\
33--enable-umrw\
34--disable-shared\
35--enable-static\
36--enable-fast-install\
37--disable-libtool-lock\
38--disable-largefile
关于configure配置参数的含义，可以运行"
../dist/configure--help"
查看帮助，这里不再介绍。
要强调的一点是uClibc只能用静态编译，因此一定要选择--disable-shared。
接着执行./myconfig运行配置并编译安装函数库：
/home/work/db/db-4.5.20/build_unix#./myconfig>
/dev/null
configure:
WARNING:
Inthefuture,Autoconfwillnotdetectcross-tools
whosenamedoesnotstartwiththehosttriplet.Ifyouthinkthis
configurationisusefultoyou,pleasewritetoautoconf@gnu.org.
cat:
/etc/ld.so.conf.d/*.conf:
Nosuchfileordirectory
/home/work/db/db-4.5.20/build_unix#make>
/dev/null&
&
makeinstall>
../dist/../hmac/sha1.c:
96:
warning:
`R0'
redefined
/usr/local/lib/gcc-lib/arm-elf/2.95.3/../../../../arm-elf/include/sys/ucontext.h:
40:
thisisthelocationofthepreviousdefinition
97:
`R1'
42:
98:
`R2'
44:
99:
`R3'
46:
100:
`R4'
48:
warning:
.rodatasectioncontainsrelocations
strip:
/home/work/db/Berkeley.DB/bin/db_archive:
不可识别的文件格式
/home/work/db/Berkeley.DB/bin/db_checkpoint:
/home/work/db/Berkeley.DB/bin/db_deadlock:
/home/work/db/Berkeley.DB/bin/db_dump:
/home/work/db/Berkeley.DB/bin/db_hotbackup:
/home/work/db/Berkeley.DB/bin/db_load:
/home/work/db/Berkeley.DB/bin/db_printlog:
/home/work/db/Berkeley.DB/bin/db_recover:
/home/work/db/Berkeley.DB/bin/db_stat:
/home/work/db/Berkeley.DB/bin/db_upgrade:
/home/work/db/Berkeley.DB/bin/db_verify:
编译过程中会出现一些warning，不用理它们。
安装完后，会在指定的安装目录/home/work/db/Berkeley.DB下生成函数库：
/home/work/db/db-4.5.20/build_unix#cd/home/work/db/Berkeley.DB/
/home/work/db/Berkeley.DB#ls
...bindocsincludelib
/home/work/db/Berkeley.DB#lllib/
总用量1962
drwxr-xr-x2rootroot1042006-10-0812:
57.
drwxr-xr-x6rootroot1442006-10-0812:
57..
-rw-r--r--1rootroot10022662006-10-0812:
57libdb-4.5.a
57libdb.a
（三）数据库操作测试
创建一个测试程序如下：
/home/work/db/Berkeley.DB#cat-ntestdb.c
1#include
2#include
3#include
4
5#defineDESCRIPTION_SIZE20
6intmain（）
7{
8DB*dbp;
/*DBstructurehandle*/
9u_int32_tflags;
/*databaseopenflags*/
10intret;
/*functionreturnvalue*/
11char*description="
Grocerybill."
;
12char*description1[DESCRIPTION_SIZE+1];
13DBTkey,data;
14floatmoney;
15
16/*Initializethestructure.This
17*databaseisnotopenedinanenvironment,
18*sotheenvironmentpointerisNULL.*/
19ret=db_create（&
dbp,NULL,0）;
20if（ret!
=0）{
21/*Errorhandlinggoeshere*/
22printf（"
Createfail!
\n"
）;
23}
24
25/*Databaseopenflags*/
26flags=DB_CREATE;
/*Ifthedatabasedoesnotexist,
27*createit.*/
28
29/*openthedatabase*/
30ret=dbp->
open（dbp,/*DBstructurepointer*/
31NULL,/*Transactionpointer*/
32"
/home/my_db.db"
/*On-diskfilethatholdsthedatabase.*/
33NULL,/*Optionallogicaldatabasename*/
34DB_BTREE,/*Databaseaccessmethod*/
35flags,/*Openflags*/
360）;
/*Filemode（usingdefaults）*/
37if（ret!
38/*Errorhandlinggoeshere*/
39printf（"
Creatednewdatabase.\n"
40}
41
42money=122.45;
43
44/*ZeroouttheDBTsbeforeusingthem.*/
45memset（&
key,0,sizeof（DBT））;
46memset（&
data,0,sizeof（DBT））;
47
48key.data=&
money;
49key.size=sizeof（float）;
50
51data.data=description;
52data.size=strlen（description）+1;
53
54ret=dbp->
put（dbp,NULL,&
key,&
data,DB_NOOVERWRITE）;
55if（ret==DB_KEYEXIST）{
56dbp->
err（dbp,ret,
57"
Putfailedbecausekey%falreadyexists"
money）;
58}
59
60memset（&
61
62data.data=&
description1;
63data.ulen=DESCRIPTION_SIZE+1;
64data.flags=DB_DBT_USERMEM;
65dbp->
get（dbp,NULL,&
data,0）;
66
67printf（"
data:
%s\n"
（char*）data.data）;
68
69/*Whenwe'
redonewiththedatabase,closeit.*/
70if（dbp!
=NULL）
71dbp->
close（dbp,0）;
72
73return0;
74}
这个程序会在目标板上/home/目录下创建一个文件名为my_db.db的数据库，接着增加一条记录，然后从数据库中读取出新添加的这条记录，最后关闭数据库。
程序要烧写到目标板上，需要进行交叉编译：
/home/work/db/Berkeley.DB#arm-elf-gcc-O3-Wall-mapcs-32-mtune=arm7tdmi-fno-builtin-msoft-float-Os-D__uClinux__-D__ARM_CPU__-I/home/work/uClinux-dist/lib/uClibc/include-I/home/uClinux-dist/linux-2.4.x/include-I/home/work/db/Berkeley.DB/include-D_DEBUG_-ctestdb.c-otestdb.o
/home/work/db/Berkeley.DB#arm-elf-gcctestdb.o-nostartfiles-Wl,-elf2flt-L/home/uClinux-dist/lib/uClibc/lib-L/home/work/db/Berkeley.DB/lib/home/uClinux-dist/lib/uClibc/lib/crt0.o/home/uClinux-dist/lib/uClibc/lib/crti.o/home/uClinux-dist/lib/uClibc/lib/crtn.o-lc-ldb-otestdb
/home/work/db/Berkeley.DB#ll
总用量1217
drwxr-xr-x6rootroot2802006-10-0813:
22.
drwxr-xr-x4rootroot1442006-10-0812:
50..
drwxr-xr-x2rootroot3762006-10-0812:
57bin
drwxr-xr-x14rootroot3842006-10-0812:
57docs
drwxr-xr-x2rootroot962006-10-0812:
57include
57lib
-rwxr--r--1rootroot5844762006-10-0813:
22testdb
-rw-r--r--1rootroot21712006-10-0813:
22testdb.c
-rw-------1rootroot21632006-10-0813:
09testdb.c~
-rwxr-xr-x1rootroot6736832006-10-0813:
22testdb.gdb
-rw-r--r--1rootroot15402006-10-
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