一個實現C/C++連接MYSQL數據庫的很好的例子
//下面的代碼是一個實現C++連接MYSQL數據庫的很好的例子
//這裏用了建表，插入，檢索，刪表等常用功能
//我用VC++6.0生成，已經成功連接了。
//在VC++6.0中要想把做一下兩步準備工作纔可以。
//(1)Tools->Options->Directories->Include files中添加C:/Program Files/MySQL/MySQL Server 6.0/include
//(2)Tools->Options->Directories->Library files中添加C:/Program Files/MySQL/MySQL Server 6.0/lib/opt
//其實就是將頭文件和庫文件包含進來
//我覺得這個例子寫的很好，再結合自己的試驗，特地介紹給大家！
#include <winsock.h>
#include <iostream>
#include <string>
#include <mysql.h>
using namespace std;
#pragma comment(lib, "ws2_32.lib")
#pragma comment(lib, "libmysql.lib")
int main()
{
cout<<"****************************************"<<endl;
//必備的一個數據結構
MYSQL mydata;
//初始化數據庫
if(0==mysql_library_init(0,NULL,NULL))
{
cout<<"mysql_library_init() succeed"<<endl;
}
else
{
cout<<"mysql_library_init() failed"<<endl;
return -1;
}
//初始化數據結構
if(NULL!=mysql_init(&mydata))
{
cout<<"mysql_init() succeed"<<endl;
}
else
{
cout<<"mysql_init() failed"<<endl;
return -1;
}
//在連接數據庫之前，設置額外的連接選項
//可以設置的選項很多，這裏設置字符集，否則無法處理中文
if(0==mysql_options(&mydata,MYSQL_SET_CHARSET_NAME,"gbk"))
{
cout<<"mysql_options() succeed"<<endl;
}
else
{
cout<<"mysql_options() failed"<<endl;
return -1;
}
//連接數據庫
if(NULL!=mysql_real_connect(&mydata,"localhost","root","test","test",3306,NULL,0))
//這裏的地址，用戶名，密碼，端口可以根據自己本地的情況更改
{
cout<<"mysql_real_connect() succeed"<<endl;
}
else
{
cout<<"mysql_real_connect() failed"<<endl;
return -1;
}
//sql字符串
string sqlstr;
//創建一個表
sqlstr ="CREATE TABLE IF NOT EXISTS user_info";
sqlstr+="(";
sqlstr+="user_id INT UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY COMMENT 'Unique User ID',";
sqlstr+="user_name VARCHAR(100) CHARACTER SET gb2312 COLLATE gb2312_chinese_ci NULL COMMENT 'Name Of User',";
sqlstr+="user_second_sum INT UNSIGNED NOT NULL DEFAULT 0 COMMENT 'The Summation Of Using Time'";
sqlstr+=");";
if(0==mysql_query(&mydata,sqlstr.c_str()))
{
cout<<"mysql_query() create table succeed"<<endl;
}
else
{
cout<<"mysql_query() create table failed"<<endl;
mysql_close(&mydata);
return -1;
}
#ifdef STEPBYSTEP
system("pause");
#endif
//向表中插入數據
sqlstr ="INSERT INTO user_info(user_name) VALUES('公司名稱'),('一級部門'),('二級部門'),('開發小組'),('姓名');";
if(0==mysql_query(&mydata,sqlstr.c_str()))
{
cout<<"mysql_query() insert data succeed"<<endl;
}
else
{
cout<<"mysql_query() insert data failed"<<endl;
mysql_close(&mydata);
return -1;
}
//顯示剛纔插入的數據
sqlstr="SELECT user_id,user_name,user_second_sum FROM user_info";
MYSQL_RES *result=NULL;
if(0==mysql_query(&mydata,sqlstr.c_str()))
{
cout<<"mysql_query() select data succeed"<<endl;
//一次性取得數據集
result=mysql_store_result(&mydata);
//取得並打印行數
int rowcount=mysql_num_rows(result);
cout<<"row count: "<<rowcount<<endl;
//取得並打印各字段的名稱
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;
//打印各行
MYSQL_ROW row=NULL;
row=mysql_fetch_row(result);
while(NULL!=row)
{
for(int i=0; i<fieldcount;i++)
{
cout<<row<<"/t/t";
}
cout<<endl;
row=mysql_fetch_row(result);
}
}
else
{
cout<<"mysql_query() select data failed"<<endl;
mysql_close(&mydata);
return -1;
}
//刪除剛纔建的表
sqlstr="DROP TABLE user_info";
if(0==mysql_query(&mydata,sqlstr.c_str()))
{
cout<<"mysql_query() drop table succeed"<<endl;
}
else
{
cout<<"mysql_query() drop table failed"<<endl;
mysql_close(&mydata) ;
return -1;
}
mysql_free_result(result);
mysql_close(&mydata);
mysql_server_end();
system("pause");
return 0;
}