vc6.0连接mysql数据库
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。。