本篇内容为大家讲解的是MySQL C API安装和使用，感兴趣的同学参考学习下，本文内容如下:
为了使用MySQL C API, 得安装软件包 libmysqlclient-dev.
$ sudo apt-get install libmysqlclient-dev
在我64位Ubuntu 15.10上, libmysqlclient.a安装的位置是: /usr/lib/x86_64-linux-gnu/.
至于编译链接选项, 可以借助 mysql_config 脚本来完成.
$ mysql_config --cflags
-I/usr/include/mysql -DBIG_JOINS=1 -fno-strict-aliasing -g -fabi-version=2 -fno-omit-frame-pointer -fno-strict-aliasing
$ mysql_config --libs
-L/usr/lib/x86_64-linux-gnu -lmysqlclient -lpthread -lz -lm -ldl
写一个最简单的程序:
#include <mysql/mysql.h>
#include <stdio.h>
#include <stdlib.h>
int main() {
MYSQL *conn;
MYSQL_RES *res;
MYSQL_ROW row;
char *server = "localhost";
char *user = "root";
char *password = "******";
char *database = "test";
conn = mysql_init(NULL);
/* Connect to database */
if (!mysql_real_connect(conn, server,
user, password, database, 0, NULL, 0)) {
fprintf(stderr, "%s\n", mysql_error(conn));
exit(1);
}
/* send SQL query */
if (mysql_query(conn, "show tables")) {
fprintf(stderr, "%s\n", mysql_error(conn));
exit(1);
}
res = mysql_use_result(conn);
/* output table name */
printf("MySQL Tables in mysql database:\n");
while ((row = mysql_fetch_row(res)) != NULL)
printf("%s \n", row[0]);
/* close connection */
mysql_free_result(res);
mysql_close(conn);
return 0;
}
编译:
$ gcc -c `mysql_config --cflags` test.c
链接:
$ gcc -o test test.o `mysql_config --libs`
MySQL文档说,
On Unix, linking uses dynamic libraries by default.
在Unix上, 链接默认使用动态库.
使用ldd命令查看test程序依赖的动态库:
$ ldd test
linux-vdso.so.1 => (0x00007ffecd1ab000)
libmysqlclient.so.18 => /usr/lib/x86_64-linux-gnu/libmysqlclient.so.18 (0x00007fe471310000)
libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007fe470f46000)
libz.so.1 => /lib/x86_64-linux-gnu/libz.so.1 (0x00007fe470d2b000)
libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007fe470b27000)
libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007fe470909000)
libstdc++.so.6 => /usr/lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007fe470586000)
libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007fe47027e000)
libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007fe470067000)
/lib64/ld-linux-x86-64.so.2 (0x0000556c5bc33000)
可以看到test程序依赖动态库libmysqlclient.so.
如果要改链接静态库, 需添加静态库的路径名到链接命令中:
add its path name to the link command.
$ gcc -o test test.o `mysql_config --variable=pkglibdir`/libmysqlclient.a
但是问题是, 光指定libmysqlclient.a还不够, 其它库也得指定. MySQL文档是这么说的:
mysql_config does not currently provide a way to list all libraries needed for static linking, so it might be necessary to name additional libraries on the link command (for example, -lnsl -lsocket on Solaris). To get an idea which libraries to add, use mysql_config --libs and ldd libmysqlclient.so (or otool -L libmysqlclient.dylib on OS X).
可见比较麻烦, 所以就按照默认的行为来吧.
在CentOS里使用MySQL C API：http://www.linuxdiyf.com/linux/1030.html