c语言怎么连接mysql数据库 代码

//vc工具中添加E:\WAMP\BIN\MYSQL\MYSQL5.5.8\LIB 路径

//在工程设置-》链接》库模块中添加 libmysql.lib

#include <stdio.h>

#include <time.h>

#include <string.h>

#include <winsock.h>

#include "E:\wamp\bin\mysql\mysql5.5.8\include\mysql.h"

void main(){

MYSQL *conn

MYSQL_RES *res

MYSQL_ROW row

char *server ="localhost"

char *user ="root"

char *password=""

char *database="test"

char sql[1024]="select * from chinaren"

conn=mysql_init(NULL)

if(!mysql_real_connect(conn,server,user,password,database,0,NULL,0)){

fprintf(stderr,"%s\n",mysql_error(conn))

exit(1)

}

if(mysql_query(conn,sql)){

fprintf(stderr,"%s\n",mysql_error(conn))

exit(1)

}

res=mysql_use_result(conn)

while((row = mysql_fetch_row(res))!=NULL){

printf("%s\n",row[2])

}

mysql_free_result(res)

mysql_close(conn)

}

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#if defined(_WIN32) || defined(_WIN64) //为了支持windows平台上的编译

#include <windows.h>

#endif

#include <stdio.h>

#include <stdlib.h>

#include "mysql.h"

//定义数据库 *** 作的宏，也可以不定义留着后面直接写进代码

#define SELECT_QUERY "show tables"

int main(int argc, char **argv) //char **argv 相当于 char *argv[]

{

MYSQL mysql,*handle //定义数据库连接的句柄，它被用于几乎所有的MySQL函数

MYSQL_RES *result //查询结果集，结构类型

MYSQL_FIELD *field//包含字段信息的结构

MYSQL_ROW row //存放一行查询结果的字符串数组

char querysql[160] //存放查询sql语句字符串

//初始化

mysql_init(&mysql)

//连接数据库

if (!(handle = mysql_real_connect(&mysql,"localhost","user","pwd","dbname",0,NULL,0))) {

fprintf(stderr,"Couldn't connect to engine!\n%s\n\n",mysql_error(&mysql))

}

sprintf(querysql,SELECT_QUERY,atoi(argv[1]))

//查询数据库

if(mysql_query(handle,querysql)) {

fprintf(stderr,"Query failed (%s)\n",mysql_error(handle))

}

//存储结果集

if (!(result=mysql_store_result(handle))) {

fprintf(stderr,"Couldn't get result from %s\n", mysql_error(handle))

}

printf("number of fields returned: %d\n",mysql_num_fields(result))

//读取结果集的内容

while (row = mysql_fetch_row(result)) {

printf("table: %s\n",(((row[0]==NULL)&&(!strlen(row[0]))) ? "NULL" : row[0]) )

}

//释放结果集

mysql_free_result(result)

//关闭数据库连接

mysql_close(handle)

system("PAUSE")

//为了兼容大部分的编译器加入此行

return 0

}

c++不支持MySQL连接，所以

常见的有两种方法

1。 ODBC连接mysql。安装mysql后，再安装个mysql connection，你百度搜一下。 然后odbc创建mysql连接。

2. mysql自带的函数库

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)

}

}

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