怎样在C++中调用MYSQL数据库中的数据

1、用CAPI连接MySQL数据库有两个步骤：

1）初始化一个连接句柄

2）建立连接

所用到的函数如下：

MYSQL *mysql_init(MYSQL *connection) // 初始化连接句柄

//成功返回MySQL结构指针，失败返回NULL

MYSQL *mysql_real_connect(MYSQL *connection,

const char *server_host,

const char *sql_user_name,

const char *sql_password,

const char *db_name,

unsigned int port_number,

const char *unix_socket_name,

unsigned int flags) //建立连接

//成功返回MySQL结构指针，失败返回NULL

以下是完整实例：

#include <iostream>

#include <fstream>

#include <cstdlib>

#include <mysql/mysql.h>

using namespace std

void mysql_err_function(MYSQL * connection)

int main()

{

//freopen("input.txt","r",stdin)

MYSQL * connection

connection = mysql_init(NULL)

if (!connection)

{

cout <<"mysql_init failed!" <<endl

exit(-1)

}

if (!mysql_real_connect(connection,"localhost","root","123456","test",0,NULL,0))

{

cout <<"Connection To MySQL failed!" <<endl

mysql_err_function(connection)

}

cout <<"Connection To MySQL Server is Success..." <<endl

string str

getline(cin,str)

int res = 0

int affected_count = 0

while (str != "close" &&str != "" &&!res)

{

res = mysql_query(connection,str.c_str())

affected_count += mysql_affected_rows(connection)

if (res)

{

if (mysql_errno(connection))

{

cout <<"Error " <<mysql_errno(connection) <<" : "

<<mysql_error(connection) <<'\n' <<endl

break

}

}

getline(cin,str)

}

cout <<"Have affected " <<affected_count <<" rows!" <<endl

mysql_close(connection)

cout <<"Connection To MySQL Server is closed..." <<endl

return 0

}

void mysql_err_function(MYSQL * connection)

{

if (mysql_errno(connection))

{

cout <<"Error " <<mysql_errno(connection) <<" : "

<<mysql_error(connection) <<endl

exit(-1)

}

}

只要libmysqlclient.so在/usr/lib/mysql 中，-L/usr/lib/mysql -lmysqlclient 就是link libmysqlclient.so

所以，你应该找一下libmysqlclient.so的安装位置，比如安装在/usr/lib/i386-linux-gnu

链接libmysqlclient.so，就是-L/usr/lib/i386-linux-gnu -lmysqlclient

另外，这种编译出现的问题，请贴出具体的输出，不要泛泛的讲。泛泛的讲别人根本不明白是那里出了问题。。。

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