1. 下載mysql c connector 安裝包；有兩種方法：

1 下載tar文件，將其中的的 lib， include ， bin 都放在 /usr/local 相應的目錄下；

2. 也可配置鏈接庫的附加目錄： sudo vi /etc/ld.so.conf 文件中加入你的連接器的lib目錄；

3. 好像也可以用 sudo apt-get install libmysqclient-dev

對於c++的好像是 sudo apt-get install libmysql++-dev

2.編輯 C 程序利用mysql c api ：我的程序如下：

#include<mysql.h>
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
static void output_error(MYSQL * mysql);
int main(int argc, char* argv[]) {
MYSQL mysql;
MYSQL_RES * result;
MYSQL_ROW row;
MYSQL_FIELD * fields;
const char* host = "localhost";
const char* user = "root";
const char* password = "root";
const char* database = "test";
const int port = 3306;
const char* socket = NULL;
const int flag = 0;
const char* sql ;
int num_fields;
unsigned long * lengths;
int i;
//initialize the database
if(!mysql_init(&mysql) ) {
output_error(&mysql);
}
printf("mysql initialized successfully ! /n");
//connect to the database;
if(!mysql_real_connect(&mysql, host, user, password, database, port, socket, flag)) {
output_error(&mysql);
}
printf("mysql connect successfully! /n");
printf("/n/n/nthe content of the table data in the database test/n");
printf("-----------------------------------------------------------/n");
//do the select query on the database;
sql = "select * from data" ;
//printf("%d : %d/n", sizeof(sql), strlen(sql)); // 4：18 sizeof(sql):the size of point --(4); strlen(sql):
if( mysql_real_query(&mysql, sql, strlen(sql)) ){
output_error(&mysql);
}
//fetch the the result set of the query!
result = mysql_store_result(&mysql);
if(result) {
fields = mysql_fetch_fields(result); // fetch the struct of result
num_fields = mysql_num_fields(result); // fetch the number of result fields;
//lengths = mysql_fetch_lengths(result);
for(i=0; i<num_fields; i++) {
printf("%s/t", fields[i].name );
}
printf("/n");
while(row = mysql_fetch_row(result)) {
for(i=0; i<num_fields; i++) {
printf("%s /t", row[i]);
}
printf("/n");
}
//release the result of set for release the memory
mysql_free_result(result);
}
else {
output_error(&mysql);
}
printf("/n/n-----------------------------------------------------------/n");
//close the connetion to the database
mysql_close(&mysql);
return 0;
}
static void output_error(MYSQL * mysql) {
fprintf(stderr, "errorno: %d /n", mysql_errno(mysql) );
fprintf(stderr, "error info: %s/n", mysql_error(mysql) );
exit(1);
}

#include<mysql.h>
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
static void output_error(MYSQL * mysql);
int main(int argc, char* argv[]) {
	 MYSQL mysql;
	 MYSQL_RES * result;
	 MYSQL_ROW row;
	 MYSQL_FIELD * fields;
	const char* host = "localhost";
	const char* user = "root";
	const char* password = "root";
	const char* database = "test";
	const int 	port = 3306;
	const char* socket = NULL;
	const int flag = 0;
	const char* sql ;	
	int num_fields;
	unsigned long * lengths;
	int i;
	//initialize the database 
	if(!mysql_init(&mysql) ) {
		output_error(&mysql);
	}
	printf("mysql initialized successfully ! /n");
	//connect to the database;
	if(!mysql_real_connect(&mysql, host, user, password, database, port, socket, flag)) {
		output_error(&mysql);
	}
	printf("mysql connect successfully! /n");
	printf("/n/n/nthe content of the table data in the database test/n");
	printf("-----------------------------------------------------------/n");
	//do the select query on the database;
	sql = "select * from data" ;
	//printf("%d : %d/n", sizeof(sql), strlen(sql)); // 4：18 sizeof(sql):the size of point --(4); strlen(sql):
	if( mysql_real_query(&mysql, sql, strlen(sql)) ){
		output_error(&mysql);
	}
	//fetch the the result set of the query!		
	result = mysql_store_result(&mysql);
	if(result) {
		fields = mysql_fetch_fields(result);	// fetch the struct of result	     
		num_fields = mysql_num_fields(result);  // fetch the number of result fields;
		
		//lengths = mysql_fetch_lengths(result);	
		for(i=0; i<num_fields; i++) {
			printf("%s/t", fields[i].name );
		}
		printf("/n");
		while(row = mysql_fetch_row(result)) {
			for(i=0; i<num_fields; i++) {
				printf("%s /t",  row[i]);
			 }
			 printf("/n");
		}
		//release the result of set  for release the memory
		mysql_free_result(result);	
		
	}
	else {
		output_error(&mysql);
	}
	printf("/n/n-----------------------------------------------------------/n");
	//close the connetion to the database
	mysql_close(&mysql);
	return 0;
}
 static void output_error(MYSQL * mysql) {
	fprintf(stderr, "errorno: %d /n", mysql_errno(mysql) );
	fprintf(stderr, "error info: %s/n", mysql_error(mysql) );
	exit(1);
}

3. 編譯鏈接，測試：

[c-sharp] view plain copy print ?

wzb@wzb-desktop:~/test$ gcc -o db_test db_test.c -lmysql
wzb@wzb-desktop:~/test$ ./db_test
mysql initialized successfully !
mysql connect successfully!
the content of the table data in the database test
-----------------------------------------------------------
id nodeId data flag time
1 0 0 0 2011-03-31 18:19:40
2 1 1 2 2011-03-31 18:29:05
-----------------------------------------------------------
wzb@wzb-desktop:~/test$

注意鏈接動態庫的選項　：　－lmysql

4.對mysql　ｃ開發幾個有用的命令：ldd, mysql_config, file　，ｎm

ldd:　輸出對動態庫的依賴，即依賴的動態庫的信息；

mysql_conf ：可以獲得對mysql的配置開發的信息：　mysql_config -- libs

看一下，這幾個命令的輸出情況：

[c-sharp] view plain copy print ?

wzb@wzb-desktop:~/test$ ldd db_test
linux-gate.so.1 => (0x00f40000)
libmysql.so.16 => /usr/local/lib/libmysql.so.16 (0x0020f000)
libc.so.6 => /lib/tls/i686/cmov/libc.so.6 (0x006bf000)
libpthread.so.0 => /lib/tls/i686/cmov/libpthread.so.0 (0x004e4000)
libm.so.6 => /lib/tls/i686/cmov/libm.so.6 (0x00110000)
/lib/ld-linux.so.2 (0x00af6000)
wzb@wzb-desktop:~/test$ file db_test
db_test: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.15, not stripped
wzb@wzb-desktop:~/test$ nm db_test
08049de4 d _DYNAMIC
08049ec0 d _GLOBAL_OFFSET_TABLE_
08048c88 R _IO_stdin_used
w _Jv_RegisterClasses
08049dd4 d __CTOR_END__
08049dd0 d __CTOR_LIST__
08049ddc d __DTOR_END__
08049dd8 d __DTOR_LIST__
08048dcc r __FRAME_END__
08049de0 d __JCR_END__
08049de0 d __JCR_LIST__
08049f24 A __bss_start
08049f18 D __data_start
08048c40 t __do_global_ctors_aux
08048830 t __do_global_dtors_aux
08049f1c D __dso_handle
w __gmon_start__
08048c3a T __i686.get_pc_thunk.bx
08049dd0 d __init_array_end
08049dd0 d __init_array_start
08048bd0 T __libc_csu_fini
08048be0 T __libc_csu_init
U __libc_start_main@@GLIBC_2.0
U __stack_chk_fail@@GLIBC_2.4
08049f24 A _edata
08049f2c A _end
08048c68 T _fini
08048c84 R _fp_hw
08048684 T _init
08048800 T _start
08049f28 b completed.5790
08049f18 W data_start
U exit@@GLIBC_2.0
U fprintf@@GLIBC_2.0
08048860 t frame_dummy
08048884 T main
U mysql_close
U mysql_errno
U mysql_error
U mysql_fetch_fields
U mysql_fetch_row
U mysql_free_result
U mysql_init
U mysql_num_fields
U mysql_real_connect
U mysql_real_query
U mysql_store_result
08048b66 t output_error
08049f20 d p.5788
U printf@@GLIBC_2.0
U putchar@@GLIBC_2.0
U puts@@GLIBC_2.0
08049f24 B stderr@@GLIBC_2.0
wzb@wzb-desktop:~/test$

wzb@wzb-desktop:~/test$ ldd db_test
	linux-gate.so.1 =>  (0x00f40000)
	libmysql.so.16 => /usr/local/lib/libmysql.so.16 (0x0020f000)
	libc.so.6 => /lib/tls/i686/cmov/libc.so.6 (0x006bf000)
	libpthread.so.0 => /lib/tls/i686/cmov/libpthread.so.0 (0x004e4000)
	libm.so.6 => /lib/tls/i686/cmov/libm.so.6 (0x00110000)
	/lib/ld-linux.so.2 (0x00af6000)
wzb@wzb-desktop:~/test$ file db_test
db_test: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.15, not stripped
wzb@wzb-desktop:~/test$ nm db_test
08049de4 d _DYNAMIC
08049ec0 d _GLOBAL_OFFSET_TABLE_
08048c88 R _IO_stdin_used
         w _Jv_RegisterClasses
08049dd4 d __CTOR_END__
08049dd0 d __CTOR_LIST__
08049ddc d __DTOR_END__
08049dd8 d __DTOR_LIST__
08048dcc r __FRAME_END__
08049de0 d __JCR_END__
08049de0 d __JCR_LIST__
08049f24 A __bss_start
08049f18 D __data_start
08048c40 t __do_global_ctors_aux
08048830 t __do_global_dtors_aux
08049f1c D __dso_handle
         w __gmon_start__
08048c3a T __i686.get_pc_thunk.bx
08049dd0 d __init_array_end
08049dd0 d __init_array_start
08048bd0 T __libc_csu_fini
08048be0 T __libc_csu_init
         U __libc_start_main@@GLIBC_2.0
         U __stack_chk_fail@@GLIBC_2.4
08049f24 A _edata
08049f2c A _end
08048c68 T _fini
08048c84 R _fp_hw
08048684 T _init
08048800 T _start
08049f28 b completed.5790
08049f18 W data_start
         U exit@@GLIBC_2.0
         U fprintf@@GLIBC_2.0
08048860 t frame_dummy
08048884 T main
         U mysql_close
         U mysql_errno
         U mysql_error
         U mysql_fetch_fields
         U mysql_fetch_row
         U mysql_free_result
         U mysql_init
         U mysql_num_fields
         U mysql_real_connect
         U mysql_real_query
         U mysql_store_result
08048b66 t output_error
08049f20 d p.5788
         U printf@@GLIBC_2.0
         U putchar@@GLIBC_2.0
         U puts@@GLIBC_2.0
08049f24 B stderr@@GLIBC_2.0
wzb@wzb-desktop:~/test$

[c-sharp] view plain copy print ?

wzb@wzb-desktop:~/test$ mysql_config
Copyright 2009 Sun Microsystems, Inc.
This software comes with ABSOLUTELY NO WARRANTY. This is free software,
and you are welcome to modify and redistribute it under the GPL license
Get compiler flags for using the MySQL client library.
Usage: mysql_config [OPTIONS]
--cflags [-I/usr/local/include]
-?, --help Display this help and exit.
--include [-I/usr/local/include]
--libs [-L/usr/local/lib -lmysql -lpthread]
--libs_r [-L/usr/local/lib -lmysql -lpthread]
--version [6.0.2]
wzb@wzb-desktop:~/test$ mysql_config --libs
-L/usr/local/lib -lmysql -lpthread
wzb@wzb-desktop:~/test$ mysql_config --libs_r
-L/usr/local/lib -lmysql -lpthread
wzb@wzb-desktop:~/test$ mysql_config --include
-I/usr/local/include
wzb@wzb-desktop:~/test$

下文的鏈接：http://www.cyberciti.biz/tips/linux-unix-connect-mysql-c-api-program.html

Howto: Connect MySQL server using C program API under Linux or UNIX

by Vivek Gite on May 31, 2007 · 56 comments

From my mailbag:

How do I write a C program to connect MySQL database server?

MySQL database does support C program API just like PHP or perl.

The C API code is distributed with MySQL. It is included in the mysqlclient library and allows C programs to access a database.

Many of the clients in the MySQL source distribution are written in C. If you are looking for examples that demonstrate how to use the C API, take a look at these clients. You can find these in the clients directory in the MySQL source distribution.

Requirements

Make sure you have development environment installed such as gcc, mysql development package etc. Following is the list summarize the list of packages to compile program:

mysql: MySQL client programs and shared library
mysqlclient: Backlevel MySQL shared libraries (old libs)
mysql-devel: Files for development of MySQL applications (a must have)
mysql-server: Mysql server itself
gcc, make and other development libs: GNU C compiler

Sample C Program

Following instructions should work on any Linux distro or UNIX computer. Here is the small program that connects to mysql server and list tables from mysql database.(download link):

[cpp] view plain copy print ?

* Simple C program that connects to MySQL Database server*/
#include <mysql.h>
#include <stdio.h>
main() {
MYSQL *conn;
MYSQL_RES *res;
MYSQL_ROW row;
char *server = "localhost";
char *user = "root";
char *password = "PASSWORD"; /* set me first */
char *database = "mysql";
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);
}

How do I compile and link program against MySQL libs?

MySQL comes with a special script called mysql_config. It provides you with useful information for compiling your MySQL client and connecting it to MySQL database server. You need to use following two options.
Pass --libs option - Libraries and options required to link with the MySQL client library.

$ mysql_config --libs
Output:

-L/usr/lib64/mysql -lmysqlclient -lz -lcrypt -lnsl -lm -L/usr/lib64 -lssl -lcrypto

Pass --cflags option - Compiler flags to find include files and critical compiler flags and defines used when compiling the libmysqlclient library.
$ mysql_config --cflags
Output:

-I/usr/include/mysql -g -pipe -m64 -D_GNU_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -fno-strict-aliasing

You need to pass above option to GNU C compiler i.e. gcc. So to compile above program, enter:
$ gcc -o output-file $(mysql_config --cflags)mysql-c-api.c $(mysql_config --libs)
Now execute program:
$ ./output-file
Output:

MySQL Tables in mysql database:


columns_priv


db


func


help_category


help_keyword


help_relation


help_topic


host


tables_priv


time_zone


time_zone_leap_second


time_zone_name


time_zone_transition


time_zone_transition_type


user

References:

MySQL C API - A must read - official MySQL C API documentation

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用C api 連接mysql數據庫的開發實例

Howto: Connect MySQL server using C program API under Linux or UNIX

Requirements

Sample C Program

How do I compile and link program against MySQL libs?

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用C api 連接mysql數據庫的 開發實例

Howto: Connect MySQL server using C program API under Linux or UNIX

Requirements

Sample C Program

How do I compile and link program against MySQL libs?

References:

用C api 連接mysql數據庫的開發實例