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首先去下一個berkeley db,，下面這個是官方網(wǎng)站： http://www.oracle.com/database/berkeley-db/index.html 我所下到的最新版本是4.5.20 首先解壓縮： tar zxvf db-4.5.20.tar.tar cd db-4.5.20 可以看到有個README文件,，它讓我們進(jìn)docs/index.html查看具體的文檔,。 查看文檔完畢,，開始編譯，由于berkeley db是用autoconf和libtool編譯工程的,，所以編譯相當(dāng)方便,。對于一般的Linux/Unix而言，只要進(jìn)入build_unix目錄,，命令如下： cd bulid_unix ../dist/configure #configre的參數(shù)可以使用-h命令查看 make make install 生成的目標(biāo)文件和庫都將在目錄bulid_unix下,。如果要重新編譯： make clean make 而我要用在的ARM9上（ARM7也一樣，都是flat的文件格式，庫文件也是）,，我所用的交叉編譯工具是arm-linux-gcc, 版本3.3.2.我首先在db-4.5.20下新建了一個build_arm_linux目錄,，然后編譯，命令如下： mkdir build_arm_linux cd build_arm_linux ../dist/configure CC=arm-linux-gcc --host=arm make 哈,， 是不是很簡單,。且慢，ARM上沒法直接install的,。以后怎么使用呢？你看看build_arm_linux下面是不是有db.h和libdb- 4.5.a（靜態(tài)庫）,，這就是我們所要的文件,，你可以把db.h拷貝到目標(biāo)系統(tǒng)中的/usr/include下面，或者自己添加環(huán)境變量,，同理,， libdb-4.5.a也可以放到/usr/lib下面，這樣你就可以想系統(tǒng)庫一樣調(diào)用它,。 因為我只用一個工程要使用它,，所以我是直接跟我的工程一起編譯的，假使跟工程文件放在一起,。使用的時候只要 #include "db.h"即可,，編譯的時候注意加編譯選項-L. -ldb-4.5就可以將庫靜態(tài)編譯進(jìn)去。 uClinux上Berkeley DB v4.5.20移植手記 Berkeley DB 是一個很棒的開源的嵌入式數(shù)據(jù)庫,，它主要運行在Unix/Linux上?，F(xiàn)在它已成為Oracle的一部分，叫作 Oracle Berkeley DB ,。 下面主要介紹一下它在我最近玩的uClinux上的移植過程,。 Hily Jiang Email&Gtalk: hilyjiang at Gmail Blog: http://hily./ 下載頁面： http://dev./downloads/releasehistorybdb.html 我使用的是當(dāng)前最新版的 4.5.20（點擊下載） 。 linux:/home/work/db # ll 總用量 9078 drwxr-xr-x 2 root root 80 2006-10-08 12:36 . drwxr-xr-x 11 root root 1120 2006-10-08 12:33 .. -r-xr-xr-x 1 root users 9281894 2006-10-08 12:36 db-4.5.20.tar.gz （一）解壓 linux:/home/work/db # tar -zxf db-4.5.20.tar.gz linux:/home/work/db # cd db-4.5.20/ linux:/home/work/db/db-4.5.20 # ls . db_checkpoint db_upgrade libdb_java README .. db_deadlock db_verify LICENSE rep btree db_dump dist lock repmgr build_unix db_dump185 docs log rpc_client build_vxworks db_hotbackup env mod_db4 rpc_server build_windows dbinc examples_c mp sequence clib dbinc_auto examples_cxx mutex tcl common db_load examples_java os test crypto dbm fileops os_vxworks txn cxx db_printlog hash os_windows xa db db_recover hmac perl db185 dbreg hsearch php_db4 db_archive db_stat java qam docs目錄下有我們需要的文檔,，包括快速入門,、各種語言的API手冊等資料。 （二）配置和編譯 建立一個腳本以方便配置,。由于unix/linux編譯時的工作路徑必須是build_unix,，因此我們需要在build_unix目錄下創(chuàng)建腳本。 我創(chuàng)建了一個名為myconfig的腳本,，內(nèi)容如下： linux:/home/work/db/db-4.5.20/build_unix # cat -n myconfig 1 #!/bin/sh 2 3 CC=arm-elf-gcc \ 4 CFLAGS="-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/../ " \ 5 LDFLAGS="-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 關(guān)于configure配置參數(shù)的含義,，可以運行"../dist/configure --help"查看幫助，這里不再介紹,。 要強調(diào)的一點是uClibc只能用靜態(tài)編譯,，因此一定要選擇--disable-shared。 接著執(zhí)行./myconfig運行配置并編譯安裝函數(shù)庫： linux:/home/work/db/db-4.5.20/build_unix # ./myconfig >/dev/null configure: WARNING: In the future, Autoconf will not detect cross-tools whose name does not start with the host triplet. If you think this configuration is useful to you, please write to [email protected]. cat: /etc/ld.so.conf.d/*.conf: No such file or directory linux:/home/work/db/db-4.5.20/build_unix # make >/dev/null && make install >/dev/null ../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: warning: this is the location of the previous definition ../dist/../hmac/sha1.c:97: warning: `R1' redefined /usr/local/lib/gcc-lib/arm-elf/2.95.3/../../../../arm-elf/include/sys/ucontext.h:42: warning: this is the location of the previous definition ../dist/../hmac/sha1.c:98: warning: `R2' redefined /usr/local/lib/gcc-lib/arm-elf/2.95.3/../../../../arm-elf/include/sys/ucontext.h:44: warning: this is the location of the previous definition ../dist/../hmac/sha1.c:99: warning: `R3' redefined /usr/local/lib/gcc-lib/arm-elf/2.95.3/../../../../arm-elf/include/sys/ucontext.h:46: warning: this is the location of the previous definition ../dist/../hmac/sha1.c:100: warning: `R4' redefined /usr/local/lib/gcc-lib/arm-elf/2.95.3/../../../../arm-elf/include/sys/ucontext.h:48: warning: this is the location of the previous definition warning: .rodata section contains relocations warning: .rodata section contains relocations warning: .rodata section contains relocations warning: .rodata section contains relocations warning: .rodata section contains relocations warning: .rodata section contains relocations warning: .rodata section contains relocations warning: .rodata section contains relocations warning: .rodata section contains relocations warning: .rodata section contains relocations warning: .rodata section contains relocations strip: /home/work/db/Berkeley.DB/bin/db_archive: 不可識別的文件格式 strip: /home/work/db/Berkeley.DB/bin/db_checkpoint: 不可識別的文件格式 strip: /home/work/db/Berkeley.DB/bin/db_deadlock: 不可識別的文件格式 strip: /home/work/db/Berkeley.DB/bin/db_dump: 不可識別的文件格式 strip: /home/work/db/Berkeley.DB/bin/db_hotbackup: 不可識別的文件格式 strip: /home/work/db/Berkeley.DB/bin/db_load: 不可識別的文件格式 strip: /home/work/db/Berkeley.DB/bin/db_printlog: 不可識別的文件格式 strip: /home/work/db/Berkeley.DB/bin/db_recover: 不可識別的文件格式 strip: /home/work/db/Berkeley.DB/bin/db_stat: 不可識別的文件格式 strip: /home/work/db/Berkeley.DB/bin/db_upgrade: 不可識別的文件格式 strip: /home/work/db/Berkeley.DB/bin/db_verify: 不可識別的文件格式 編譯過程中會出現(xiàn)一些warning，不用理它們,。 安裝完后,，會在指定的安裝目錄/home/work/db/Berkeley.DB下生成函數(shù)庫： linux:/home/work/db/db-4.5.20/build_unix # cd /home/work/db/Berkeley.DB/ linux:/home/work/db/Berkeley.DB # ls . .. bin docs include lib linux:/home/work/db/Berkeley.DB # ll lib/ 總用量 1962 drwxr-xr-x 2 root root 104 2006-10-08 12:57 . drwxr-xr-x 6 root root 144 2006-10-08 12:57 .. -rw-r--r-- 1 root root 1002266 2006-10-08 12:57 libdb-4.5.a -rw-r--r-- 1 root root 1002266 2006-10-08 12:57 libdb.a （三）數(shù)據(jù)庫操作測試 創(chuàng)建一個測試程序如下： linux:/home/work/db/Berkeley.DB # cat -n testdb.c 1 #include 2 #include 3 #include 4 5 #define DESCRIPTION_SIZE 20 6 int main() 7 { 8 DB *dbp; /* DB structure handle */ 9 u_int32_t flags; /* database open flags */ 10 int ret; /* function return value */ 11 char *description = "Grocery bill."; 12 char *description1[DESCRIPTION_SIZE + 1]; 13 DBT key, data; 14 float money; 15 16 /* Initialize the structure. This 17 * database is not opened in an environment, 18 * so the environment pointer is NULL. */ 19 ret = db_create(&dbp, NULL, 0); 20 if (ret != 0) { 21 /* Error handling goes here */ 22 printf("Create fail!\n"); 23 } 24 25 /* Database open flags */ 26 flags = DB_CREATE; /* If the database does not exist, 27 * create it.*/ 28 29 /* open the database */ 30 ret = dbp->open(dbp, /* DB structure pointer */ 31 NULL, /* Transaction pointer */ 32 "/home/my_db.db", /* On-disk file that holds the database. */ 33 NULL, /* Optional logical database name */ 34 DB_BTREE, /* Database access method */ 35 flags, /* Open flags */ 36 0); /* File mode (using defaults) */ 37 if (ret != 0) { 38 /* Error handling goes here */ 39 printf("Created new database.\n"); 40 } 41 42 money = 122.45; 43 44 /* Zero out the DBTs before using them. */ 45 memset(&key, 0, sizeof(DBT)); 46 memset(&data, 0, sizeof(DBT)); 47 48 key.data = &money; 49 key.size = sizeof(float); 50 51 data.data = description; 52 data.size = strlen(description) +1; 53 54 ret = dbp->put(dbp, NULL, &key, &data, DB_NOOVERWRITE); 55 if (ret == DB_KEYEXIST) { 56 dbp->err(dbp, ret, 57 "Put failed because key %f already exists", money); 58 } 59 60 memset(&data, 0, sizeof(DBT)); 61 62 data.data = &description1; 63 data.ulen = DESCRIPTION_SIZE + 1; 64 data.flags = DB_DBT_USERMEM; 65 dbp->get(dbp, NULL, &key, &data, 0); 66 67 printf("data: %s\n", (char *)data.data); 68 69 /* When we're done with the database, close it. */ 70 if (dbp != NULL) 71 dbp->close(dbp, 0); 72 73 return 0; 74 } 這個程序會在目標(biāo)板上/home/目錄下創(chuàng)建一個文件名為my_db.db的數(shù)據(jù)庫，接著增加一條記錄,，然后從數(shù)據(jù)庫中讀取出新添加的這條記錄,，最后關(guān)閉數(shù)據(jù)庫。 程序要燒寫到目標(biāo)板上,，需要進(jìn)行交叉編譯： linux:/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_ -c testdb.c -o testdb.o linux:/home/work/db/Berkeley.DB # arm-elf-gcc testdb.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 -o testdb linux:/home/work/db/Berkeley.DB # ll 總用量 1217 drwxr-xr-x 6 root root 280 2006-10-08 13:22 . drwxr-xr-x 4 root root 144 2006-10-08 12:50 .. drwxr-xr-x 2 root root 376 2006-10-08 12:57 bin drwxr-xr-x 14 root root 384 2006-10-08 12:57 docs drwxr-xr-x 2 root root 96 2006-10-08 12:57 include drwxr-xr-x 2 root root 104 2006-10-08 12:57 lib -rwxr--r-- 1 root root 584476 2006-10-08 13:22 testdb -rw-r--r-- 1 root root 2171 2006-10-08 13:22 testdb.c -rw------- 1 root root 2163 2006-10-08 13:09 testdb.c~ -rwxr-xr-x 1 root root 673683 2006-10-08 13:22 testdb.gdb -rw-r--r-- 1 root root 1540 2006-10-08 13:22 testdb.o 生成的可執(zhí)行文件比較大,，將近600KB。 燒寫到目標(biāo)機上后運行,，結(jié)果如下： # /home/testdb data: Grocery bill. 搞定～ 總的來說,，Berkeley DB還是比較易用的。就是生成的可執(zhí)行文件還是太大些 :-( 本文來自ChinaUnix博客,，如果查看原文請點：http://blog./u1/41638/showart_493486.html |
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