c++连接mysql.docx
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c++连接mysql
C++连接mysql数据库
环境:
windowsxpVC++6.0mysql
目的:
实现建表,插入,检索,删表等常用功能。
VC6.0的配置:
菜单栏—》工具—》选项—》目录—》添加:
C:
\ProgramFiles\MySQL\MySQLServer6.0\include
C:
\ProgramFiles\MySQL\MySQLServer6.0\lib\opt
拷贝C:
\ProgramFiles\MySQL\MySQLServer6.0\lib\opt下的libmysql.lib到C:
\ProgramFiles\MicrosoftVisualStudio\VC98\Lib下
写aa.cpp【注:
一层层执行可以看到更好的效果】
#include
#include
#include
#include
usingnamespacestd;
#pragmacomment(lib,"ws2_32.lib")
#pragmacomment(lib,"libmysql.lib")
//单步执行,不想单步执行就注释掉
#defineSTEPBYSTEP
intmain()
{
cout<<"****************************************"<
#ifdefSTEPBYSTEP
system("pause");
#endif
//必备的一个数据结构
MYSQLmydata;
//初始化数据库
if(0==mysql_library_init(0,NULL,NULL))
{
cout<<"mysql_library_init()succeed"< }
else
{
cout<<"mysql_library_init()failed"< return-1;
}
#ifdefSTEPBYSTEP
system("pause");
#endif
//初始化数据结构
if(NULL!
=mysql_init(&mydata))
{
cout<<"mysql_init()succeed"< }
else
{
cout<<"mysql_init()failed"< return-1;
}
#ifdefSTEPBYSTEP
system("pause");
#endif
//在连接数据库之前,设置额外的连接选项
//可以设置的选项很多,这里设置字符集,否则无法处理中文
if(0==mysql_options(&mydata,MYSQL_SET_CHARSET_NAME,"gbk"))
{
cout<<"mysql_options()succeed"< }
else
{
cout<<"mysql_options()failed"< return-1;
}
#ifdefSTEPBYSTEP
system("pause");
#endif
//连接数据库
if(NULL!
=mysql_real_connect(&mydata,"localhost","root","test","test",3306,NULL,0))
//这里的地址,用户名,密码,端口可以根据自己本地的情况更改
{
cout<<"mysql_real_connect()succeed"< }
else
{
cout<<"mysql_real_connect()failed"< return-1;
}
#ifdefSTEPBYSTEP
system("pause");
#endif
//sql字符串
stringsqlstr;
//创建一个表
sqlstr="CREATETABLEIFNOTEXISTSuser_info";
sqlstr+="(";
sqlstr+="user_idINTUNSIGNEDNOTNULLAUTO_INCREMENTPRIMARYKEYCOMMENT'UniqueUserID',";
sqlstr+="user_nameVARCHAR(100)CHARACTERSETgb2312COLLATEgb2312_chinese_ciNULLCOMMENT'NameOfUser',";
sqlstr+="user_second_sumINTUNSIGNEDNOTNULLDEFAULT0COMMENT'TheSummationOfUsingTime'";
sqlstr+=");";
if(0==mysql_query(&mydata,sqlstr.c_str()))
{
cout<<"mysql_query()createtablesucceed"< }
else
{
cout<<"mysql_query()createtablefailed"< mysql_close(&mydata);
return-1;
}
#ifdefSTEPBYSTEP
system("pause");
#endif
//向表中插入数据
sqlstr="INSERTINTOuser_info(user_name)VALUES('公司名称'),('一级部门'),('二级部门'),('开发小组'),('姓名');";
if(0==mysql_query(&mydata,sqlstr.c_str()))
{
cout<<"mysql_query()insertdatasucceed"< }
else
{
cout<<"mysql_query()insertdatafailed"< mysql_close(&mydata);
return-1;
}
#ifdefSTEPBYSTEP
system("pause");
#endif
//显示刚才插入的数据
sqlstr="SELECTuser_id,user_name,user_second_sumFROMuser_info";
MYSQL_RES*result=NULL;
if(0==mysql_query(&mydata,sqlstr.c_str()))
{
cout<<"mysql_query()selectdatasucceed"<
//一次性取得数据集
result=mysql_store_result(&mydata);
//取得并打印行数
introwcount=mysql_num_rows(result);
cout<<"rowcount:
"<
//取得并打印各字段的名称
unsignedintfieldcount=mysql_num_fields(result);
MYSQL_FIELD*field=NULL;
for(unsignedinti=0;i {
field=mysql_fetch_field_direct(result,i);
cout<name<<"\t\t";
}
cout<
//打印各行
MYSQL_ROWrow=NULL;
row=mysql_fetch_row(result);
while(NULL!
=row)
{
for(inti=0;i {
cout< }
cout< row=mysql_fetch_row(result);
}
}
else
{
cout<<"mysql_query()selectdatafailed"< mysql_close(&mydata);
return-1;
}
#ifdefSTEPBYSTEP
system("pause");
#endif
//删除刚才建的表
sqlstr="DROPTABLEuser_info";
if(0==mysql_query(&mydata,sqlstr.c_str()))
{
cout<<"mysql_query()droptablesucceed"< }
else
{
cout<<"mysql_query()droptablefailed"< mysql_close(&mydata);
return-1;
}
mysql_free_result(result);
mysql_close(&mydata);
mysql_server_end();
system("pause");
return0;
}
vc++添加c++文件:
添加后:
运行:
没有错误的话会在debug下生成可执行文件:
运行aa.exe:
查看数据库:
没用C连接之前:
C连接mysql修改后:
DONE!
!
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