C 連線Mysql資料庫的幾種方式

mysql資料庫是一種關係型資料庫， 近年來的使用者迅速增加，下面介紹幾種c++連線mysql的方式 .h

#ifndef mysqldatabase_mysqldatabase_h_

#define mysqldatabase_mysqldatabase_h_
#include
#include
#include
#include
#include
#include
"mysql.h"
class
mysqldatabase
;#endif

#include

"mysqloperation.h"
#include
"logger.h"
#include
#include
mysqldatabase::
mysqldatabase()
void mysqldatabase::
setconfiginfo
(std::string db_ip,
int db_port, std::string db_name, std::string db_user, std::string db_password)
bool mysqldatabase::
connectdatabase()
if(con !=
null
&&mysql_real_connect
(con, db_ip_.
c_str()
, db_user_.
c_str()
,		db_password_.
c_str()
, db_name_.
c_str()
,(unsigned
)db_port_/*3306 tcp ip埠*/
,null
/*unix socket 連線型別*/
, client_multi_statements/*執行成odbc資料庫標誌*/))
}		std::thread th
(std::
bind
(&mysqldatabase::operationdatabaseloop,
this))
;		th.
detach()
;		connect_status_ =
true;}
else
return connect_status_;
}void mysqldatabase::
closedatabase()
mysql_close
(con);}
void mysqldatabase::
operationdatabaseloop()
else}}
else
}sleep
(100);
}}bool mysqldatabase::
operationdatabase
(std::vectoroperations)
return
true;}
bool mysqldatabase::
operationdatabase
(std::vectoroperations,
int& index)
//用於初始化時插入資料庫失敗返回錯誤語句
return
true;}
mysql_res * mysqldatabase::
selectdatabase
(std::string select)
std::lock_guard<
decltype
(mutex_opt_)
>
lock
(mutex_opt_)
;bool select_status =
false
;int rt =
mysql_real_query
(con, select.
c_str()
,strlen
(select.
c_str()
));if
(rt)
else
//return select_status;
}bool mysqldatabase::
freeselect
(mysql_res *result)
int mysqldatabase::
getsqloptsize()
bool mysqldatabase::
operationdatabase
(std::string operation)
bool operation_status =
false
;int rt =
mysql_query
(con, operation.
c_str()
);if(rt !=0)
else
return operation_status;
}

qt +

= sql

//如下**段為連線mysql資料庫

qsqldatabase db = qsqldatabase::
adddatabase
("qmysql");
db.sethostname
("127.0.0.1");
db.setdatabasename
("tradesystem");
db.setport
(3306);
db.setusername
("root");
db.setpassword
("123456");
bool ok = db.
open()
;

//對資料庫的增刪查改

//1、查詢
qsqlquery query;
bool b=query.
exec
(selectorderssql)
;//填入sql語句
while
(query.
next()
)//2、非查詢
qsqlquery query;
qstring insertsql =
"delete from weatherinfo where weather_id = %1"
;    qstring sql = insertsql.
arg(5)
;bool b=query.
exec
(sql);if
(b)else

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