一、MySQL的安装
Mysql的安装去官网下载就可以。。。最新的是5.7版本。。
二、VC6.0的设置
(1)打开VC6.中选0 工具栏Tools菜单下的Options选项,在Directories的标签页中右边的“Show directories for:”下拉列表中“Includefiles”,然后在中间列表框中添加你本地安装MySQL的include目录路径。如图:
(2)在上面说到的“Show directories for:”下拉列表中选中“Library files”,然后添加你本地安装MySQL的Lib目录路径。如图:
**这里要说明一下:细心的人会发现我的这个目录和上一个图中的不一样,这是因为这个错误:libmysql.lib : fatal error LNK1113: invalid machine 无效的服务器
这是因为vc开发的是32位的程序,而mysql数据库是64位导致的,你用32位的程序去操作64位的数据库肯定会出错,我在下一篇博文中将详细说明怎么解决。
(3)在“Project settings->Link:Object/library modules”里面添加“libmysql.lib”。
(5)建议将“libmySQL.lib、libmySQL.dll”拷到你所建的工程的目录下。
这两个文件在D:\Mysql\lib目录下。
三、编程实现
1. 一个简单的小程序,看看是否能连接成功。。。
#include <stdio.h>
#include <windows.h>
#include <mysql.h> int main()
{ MYSQL mysql;
mysql_init(&mysql); //初始化mysql结构 if(!mysql_real_connect(&mysql,"localhost","myuser","123456","student_db",3306,NULL,0))
printf("\n连接数据库时发生错误!\n");
else
printf("\n连接数据库成功!\n"); mysql_close(&mysql); //释放数据库 return 0;
}
mysql_real_connect(&mysql,"localhost","myuser","123456","student_db",3306,NULL,0)//myuser是我的用户名,“123456”是密码,“student_db”是数据库,3306是端口号
2.实现查询小程序
// test.cpp : Defines the entry point for the console application.
//
#include <stdio.h>
#include <windows.h>
#include "StdAfx.h" #include <winsock.h>
#include <iostream>
#include <string>
#include <mysql.h>
using namespace std;
//不需要单步调试的就注释掉
//#define STEPBYSTEP void pause(){ #ifdef STEPBYSTEP
system("pause");
#endif
}
void writeToFile(const char *s)
{ FILE *fp=fopen("info.txt","rw");
fprintf(fp,s);
fclose(fp); }
/* int main() { MYSQL mysql;
mysql_init(&mysql); //初始化mysql结构 if(!mysql_real_connect(&mysql,"localhost","myuser","123456","student_db",3306,NULL,0))
printf("\n连接数据库时发生错误!\n");
else
printf("\n连接数据库成功!\n"); mysql_close(&mysql); //释放数据库 return 0;
}*/
int main(int argc, char* argv[]){ cout<<"start...."<<endl;
pause();
MYSQL mysql;
if(0==mysql_library_init(0,NULL,NULL))
{
cout<<"mysql_library_init succeed"<<endl; }else{
cout<<"mysql_library_init failed"<<endl;
return -1;
}
pause();
if(NULL!=mysql_init(&mysql))
{ cout<<"mysql_init succeed"<<endl;
}else{
cout<<"mysql_init failed"<<endl;
return -1;
}
pause();
if(0==mysql_options(&mysql,MYSQL_SET_CHARSET_NAME,"gb2312"))
{ cout<<"mysql_option succeed"<<endl;
}else{
cout<<"mysql_option failed"<<endl;
return -1;
}
pause(); if(NULL!=mysql_real_connect(&mysql,"localhost","myuser","123456","student_db",3306,NULL,0))
{ cout<<"mysql_real_connect succeed"<<endl;
}else{
cout<<"mysql_real_connect failed"<<endl;
return -1;
}
pause();
string sql; sql="select * from sgroup";
MYSQL_RES *result=NULL;
if(0==mysql_query(&mysql,sql.c_str()))
{ cout<<"mysql_query select succeed"<<endl;
result=mysql_store_result(&mysql);
int rowcount=mysql_num_rows(result);
cout<<"row count:"<<rowcount<<endl;
unsigned int fieldcount=mysql_num_fields(result);
MYSQL_FIELD *field=NULL;
for(unsigned int i=0;i<fieldcount;i++)
{ field=mysql_fetch_field_direct(result,i);
cout<<field->name<<"\t\t";
}
cout<<endl;
MYSQL_ROW row=NULL;
row=mysql_fetch_row(result);
while(NULL!=row)
{ for(int i=0;i<fieldcount;i++){ cout<<row[i]<<"\t\t"; }
cout<<endl;
row=mysql_fetch_row(result); }
}else{ cout<<"mysql_query select data failed"<<endl;
mysql_close(&mysql);
return -1;
}
pause();
/*sql="drop table user_info";
if(0==mysql_query(&mysql,sql.c_str()))
{ cout<<"mysql_query drop table succeed"<<endl;
}else{
cout<<"mysql_query drop table failed"<<endl;
mysql_close(&mysql);
return -1; } */
mysql_free_result(result);
mysql_close(&mysql);
mysql_server_end(); system("pause");
return 0;
}
运行结果:
至此连接成功。。哈哈。。