C API 连接MySql_MySQL

bitsCN.com

编译环境：WIN7，VS2010，MYSQL版本5.0
因为VS2010自带的CRecordSet类不能与MYSQL5.0匹配，反正我的电脑上是一创建CRecordSet类VS就崩溃，
所以如果想用ODBC接口的话只能直接调用WINAPI，代码既难看又麻烦
于是根据MYSQL自带手册编写了自己的MYSQL类，调试成功，源代码如下：

pse">mysql.h

/*  <br> * [3/9/2012] <br> * Powered by akaka <br> * <br> * akaka_mysql_h <br> * <br> * C API连接MYSQL数据库 <br> * 一、包含/include 和 /lib <br> * 二、#include<windows.h> (不添加会导致编译时错误) <br> * 三、添加libmysql.lib <br> * 四、设置环境变量：这里直接将/lib 目录下的libmysql.dll复制到c:/windows/system32/ 目录下  <br> * <br> */<br>#pragma once  <br>#include "std_lib_facilities.h"  <br>#include <windows.h>  <br>#include <mysql.h>  <br>  <br>class CMysql{    <br>public:  <br>    CMysql();  <br>    ~CMysql();   <br>    void connect(const char *host, const char *user, const char *passwd,   <br>        const char *db, unsigned int port, const char *unix_socket, unsigned long client_flag);  <br>    void query(const char *query);    <br>    void printinfo ();  <br>    void printrows ();  <br>  <br>private:  <br>    MYSQL* _sql;  <br>    MYSQL_RES* _sqlres;     // result set   <br>private:  <br>    unsigned int _column;   // how many columns in a row in "result set"  <br>};  </mysql.h></windows.h></windows.h>

pse">mysql.cpp

/*  <br> * [3/9/2012] <br> * Powered by akaka <br> * <br> *  <br> * akaka_mysql.cpp <br> */   <br>  <br>#include "akaka_mysql.h"  <br>  <br>//------------------------------------------------------------------------------  <br>  <br>CMysql::CMysql()  <br>{  <br>    if( (_sql = mysql_init(NULL)) == NULL)  <br>    {   throw runtime_error("failed in mysql_init!") ;}  <br>}  <br>  <br>CMysql::~CMysql()  <br>{  <br>    if(_sql)   <br>        mysql_close(_sql);  <br>}  <br>  <br>//------------------------------------------------------------------------------  <br>  <br>void CMysql::connect(const char *host, const char *user, const char *passwd,   <br>    const char *db, unsigned int port, const char *unix_socket, unsigned long client_flag)   <br>{  <br>    if (mysql_real_connect(_sql, host, user, passwd, db,  <br>         port, unix_socket, client_flag) == NULL)  <br>         throw runtime_error("failed in mysql_connect!");  <br>  <br>}  <br>  <br>//------------------------------------------------------------------------------   <br>void CMysql::query(const char *query)  <br>{  <br>    // mysql_query Returns:  <br>    // Zero if the query was successful. Non-zero if an error occurred.   <br>    if(mysql_query(_sql, query))  <br>        throw runtime_error("failed in mysql_query!");  <br>  <br>    _sqlres = mysql_store_result(_sql); // 保存结果集  <br>}  <br>  <br>//------------------------------------------------------------------------------    <br>void CMysql::printinfo()  <br>{  <br>    // count how many columns in a row in "result set"  <br>    _column = 0;  <br>       <br>    MYSQL_FIELD* sqlfield;  <br>    while(sqlfield = mysql_fetch_field(_sqlres)) //遍历字段  <br>    {     <br>        cout name         _column++;  <br>    }  <br>    cout }  <br>  <br>//------------------------------------------------------------------------------    <br>void CMysql::printrows()  <br>{  <br>    MYSQL_ROW sqlrow;  <br>    while( sqlrow = mysql_fetch_row(_sqlres)) // 遍历结果集  <br>    {  <br>        for(unsigned int i = 0; i         {  <br>            cout         }  <br>        cout     }     <br>}  

pse">main.cpp

//------------------------------------------------------------------------------  <br>// main  <br>int main()  <br>{  <br>    const char* host = "localhost";  <br>    const char* user = "root";  <br>    const char* passwd = "1121";  <br>    const char* db = "my";  <br>    const unsigned int port = 3306;  <br>    const char* unix_socket = NULL; // If unix_socket is not NULL, the string specifies the socket   <br>                                    // or named pipe that should be used.   <br>                                    // Note that the host parameter determines the type of the connection.   <br>    const unsigned long client_flag = 0;  // The value of client_flag is usually 0, but can be set to a combination of the following flags to enable certain features:   <br>  <br>    try  <br>    {  <br>        CMysql mysql;  <br>        mysql.connect(host,user,passwd,db,port,unix_socket,client_flag);  <br>        mysql.query("SELECT * FROM myclass");  <br>        mysql.printinfo();  <br>        mysql.printrows();  <br>        return 0;  <br>    }catch(runtime_error&amp; e)  <br>    {  <br>        cerr         return 1;  <br>    }  <br>}  

运行结果：

bitsCN.com