mysql++ 简易封装类

 快半年没更新博客了，发表篇文章 不能荒废了。 之前坚持了两年写博客的  中断了的话 有点可惜。

 

这个类不是线程安全版本请注意了 只是单实例

先看下目录结构  源代码打包放附件中

 

|-- Makefile

|-- include

|   |-- mysql_conn.h

|   `-- sns_concern.h

|-- lib

|   |-- Db

|   |   |-- Makefile

|   |   |-- mysql_conn.cpp  

|   |   `-- mysql_conn.o

|   |-- Makefile

|   |-- sns_concern.cpp

|   `-- sns_concern.o

|-- ma2

|-- ma2.cpp

|-- ma2.o

`-- maketest

 

 

是一个完整的demo,makefile写的感觉有点挫。

现在贴出mysql_conn.cpp  和 实际使用它的文件 sns_concern.cpp 

mysql_conn.cpp

 

 

#include <string>
#include <iostream>
#include <mysql++.h>

#include "mysql_conn.h"

using namespace std;
using namespace mysqlpp;

mysql_conn * mysql_conn::instance = NULL;

mysql_conn * mysql_conn::get_instance()
{
    char *user = "poker_wrt";
    char *pwd = "poker_wrt";
    char *host = "192.168.0.246";
    char *db = "test";
    char *charset = "gbk";
    if (NULL == mysql_conn::instance)    
    {
        instance = new mysql_conn(db, user, pwd, host, charset);
   }
    return instance;
}

mysql_conn::mysql_conn(char *db, char *username, char *password,char *host, char *charset)
{
    if ( !con.connect(db, host, username, password))
    {
        cout << "connect mysql error"<< endl;
    }
    string str = "set names " ;
    str = str + charset;
    this->mysql_execute(str);
    this->mysql_execute("set autocommit=0");
}

void mysql_conn::hello()
{
    cout << "from hello" << endl;
}

StoreQueryResult mysql_conn::mysql_query(string query_str, SQLQueryParms params)
{
    Query query = con.query(query_str);
    query.parse();
    StoreQueryResult res = query.store(params) ;
    return res;
}


int mysql_conn::mysql_execute(string query_str,SQLQueryParms params)
{
    Query query = con.query(query_str);
    query.parse();
    query.execute(params);
    return query.affected_rows();
}

int mysql_conn::get_insert_id()
{
    Query query = con.query();
    return query.insert_id();
}

int mysql_conn::commit()
{
    Transaction trans(con);
    trans.commit(); 
    return 1;
}

int mysql_conn::rollback()
{
    Transaction trans(con);
    trans.rollback(); 
    return 1;
}

 

 

sns_concern.cpp 

 

#include <iostream>
#include <string>
#include <mysql++.h>

#include "sns_concern.h"
using namespace std;
using namespace mysqlpp;

int sns_concern::add(int uid, string username, int uid_by, string username_by)
{

    string insert_str = "insert into t_user_concern \
                          (f_uid,f_username,f_concern_uid,f_concern_username) \
                           values(%0q,%1q,%2q,%3q)";
    SQLQueryParms params2;
    int nums;
    params2 += uid;
    params2 += username;
    params2 += uid_by;
    params2 +=  username_by;
    mysql_conn *p1 = mysql_conn::get_instance();
    nums = p1->mysql_execute(insert_str,params2);
    p1->commit();
    return nums;

}

int sns_concern::del(int uid, int uid_by)
{
    string del_str = "delete from t_user_concern where f_uid = %0q and f_concern_uid = %1q";
    SQLQueryParms params2;
    int nums;
    params2 += uid;
    params2 += uid_by;
    mysql_conn *p1 = mysql_conn::get_instance();
    nums = p1->mysql_execute(del_str,params2);
    p1->commit();
    return nums;

}

StoreQueryResult sns_concern::get(int uid)
{
    string select_str = "select f_uid uid,f_username username,f_concern_uid concern_uid,\
                             f_concern_username concern_username from t_user_concern\
                             where f_uid = %0q";
    SQLQueryParms params2;
    params2 += uid;
    mysql_conn *p1 = mysql_conn::get_instance();
    return p1->mysql_query(select_str,params2);
}

 

 

 

使用的表的sql语句在这里:

 

CREATE TABLE `t_user_concern` (

  `f_uid` int(10) unsigned NOT NULL COMMENT '用户id',

  `f_username` varchar(255) NOT NULL COMMENT '用户名',

  `f_concern_uid` int(10) unsigned NOT NULL COMMENT '用户id',

  `f_concern_username` varchar(255) NOT NULL COMMENT '用户名',

  `f_instime` datetime DEFAULT NULL COMMENT '插入时间',

  `f_uptime` datetime DEFAULT NULL COMMENT '更新时间'

) ENGINE=InnoDB DEFAULT CHARSET=utf8 COMMENT='用户关注表'