├── README.md ├── .gitignore ├── conn_pool.h ├── mysql_encap.h ├── lock.h ├── conn_pool.cpp ├── mysql_encap.cpp └── LICENSE /README.md: -------------------------------------------------------------------------------- 1 | mysql_conn_pool 2 | =============== 3 | 4 | mysql encapsulation and a db connection pool 5 | -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | # Compiled Object files 2 | *.slo 3 | *.lo 4 | *.o 5 | *.obj 6 | 7 | # Precompiled Headers 8 | *.gch 9 | *.pch 10 | 11 | # Compiled Dynamic libraries 12 | *.so 13 | *.dylib 14 | *.dll 15 | 16 | # Fortran module files 17 | *.mod 18 | 19 | # Compiled Static libraries 20 | *.lai 21 | *.la 22 | *.a 23 | *.lib 24 | 25 | # Executables 26 | *.exe 27 | *.out 28 | *.app 29 | -------------------------------------------------------------------------------- /conn_pool.h: -------------------------------------------------------------------------------- 1 | #ifndef CONN_POOL_H_ 2 | #define CONN_POOL_H_ 3 | 4 | #include "mysql_encap.h" 5 | #include "lock.h" 6 | #include 7 | #include 8 | 9 | #define HOST "localhost" 10 | #define USERNAME "test" 11 | #define PASSWORD "test" 12 | 13 | #define MAX_CONNPOOL_SIZE 100 14 | #define INIT_CONNPOOL_SIZE 10 15 | 16 | class ConnPool{ 17 | public: 18 | static ConnPool *GetInstance(); 19 | MysqlEncap *GetOneConn(); 20 | void ReleaseOneConn(MysqlEncap *); 21 | void ShowStatus(); 22 | private: 23 | int curSize;//目前已有的连接，包括connlist中空闲的和已经分配出去的 24 | int maxSize_; 25 | 26 | string hostip_; 27 | string username_; 28 | string password_; 29 | 30 | list connList;//空闲的conn 31 | MutexLock mutex; 32 | 33 | static ConnPool *conn_pool;//singleton 34 | 35 | ConnPool(const char *hostip, const char *username, const char *password, 36 | int maxSize, int initSize); 37 | ~ConnPool(); 38 | void InitConnPool(const char *hostip, const char *username, const char *password, 39 | int initSize); 40 | void DestroyConnection(MysqlEncap *sql_conn); 41 | void DestroyConnPool(); 42 | 43 | private: 44 | //禁止copy 45 | ConnPool(const ConnPool &); 46 | ConnPool &operator=(const ConnPool &); 47 | }; 48 | 49 | #endif 50 | -------------------------------------------------------------------------------- /mysql_encap.h: -------------------------------------------------------------------------------- 1 | #ifndef MYSQL_ENCAP_H_ 2 | #define MYSQL_ENCAP_H_ 3 | 4 | #include 5 | #include 6 | #include 7 | #include 8 | 9 | using namespace std; 10 | 11 | class MysqlEncap{ 12 | 13 | public: 14 | MysqlEncap(); 15 | ~MysqlEncap(); 16 | 17 | bool Connect(const char *ip, const char *username, const 18 | char *password); 19 | void CloseConnect(); 20 | 21 | 22 | bool ExecuteQuery(const char *sql); 23 | bool Execute(const char *sql); 24 | bool StartTransaction(); 25 | //修改为：当返回值0的时候，是ROLLBACK，1--COMMIT 26 | bool EndTransaction(); 27 | 28 | //return the query result count, that is, how many rows 29 | int GetQueryResultCount(); 30 | 31 | char *GetField(const char *fieldname);//根据列的名字查找当前行，得到该列的值 32 | char *GetField(int filednum);//根据列的序号查找当前行，得到该列的值 33 | char **FetchRow();//拿出一行结果 34 | 35 | void EscapeString(char *to, char *from); 36 | 37 | private: 38 | bool ReConnect(); 39 | void FreeResult();//释放上一次查询的结果 40 | 41 | private: 42 | 43 | bool isConnected;//判断是否连接 44 | bool bCommit;//当用到事务时，该值用来选择是commit还是rollback 45 | int fieldcnt;//查询结果有几列, column not rows 46 | map mapFiledToIndex;//查询结果列名字到序号的映射：id->0; name->1 47 | 48 | MYSQL sql_conn;//数据库连接 49 | MYSQL_RES *sql_result;//查询结果 50 | MYSQL_ROW sql_row;//结果中的当前行，FetchRow(); 51 | 52 | //保存连接信息，保证重连 53 | string hostip_; 54 | string username_; 55 | string password_; 56 | 57 | }; 58 | 59 | #endif 60 | -------------------------------------------------------------------------------- /lock.h: -------------------------------------------------------------------------------- 1 | /************************************************** 2 | * 该类主要是对mutex进行了RAII封装，以后还会封装condition, 3 | * 目的当然是为了便于编程使用啊 4 | * 用法： 5 | * MutexLock mutex;//定义一个mutex 6 | * 7 | * void foo(){ 8 | ... 9 | * MutexGuard lock(mutex); 10 | * ... 11 | * do something... 12 | * ... 13 | * } 14 | * lock 只在它的作用域内有效 15 | **************************************************/ 16 | 17 | #ifndef LOCK_H_ 18 | #define LOCK_H_ 19 | 20 | #include 21 | 22 | /************************************************ 23 | * mutex api的简单封装 24 | *************************************************/ 25 | class MutexLock{ 26 | public: 27 | MutexLock(){ 28 | pthread_mutex_init(&mutex_, NULL); 29 | } 30 | ~MutexLock(){ 31 | pthread_mutex_destroy(&mutex_); 32 | } 33 | 34 | void Lock(){ 35 | pthread_mutex_lock(&mutex_); 36 | } 37 | void UnLock(){ 38 | pthread_mutex_unlock(&mutex_); 39 | } 40 | 41 | private: 42 | pthread_mutex_t mutex_; 43 | 44 | private: 45 | //禁止copy 46 | MutexLock(const MutexLock &); 47 | MutexLock &operator=(const MutexLock &); 48 | }; 49 | 50 | /************************************************ 51 | * 只是简单的对mutex做RAII封装 52 | * use: 53 | * void foo(){ 54 | * MutexGuard lock(mutex); 55 | * ... 56 | * do something... 57 | * ... 58 | * } 59 | *************************************************/ 60 | class MutexGuard{ 61 | public: 62 | //explicit 防止隐式转换 63 | explicit MutexGuard(MutexLock &mutex):mutex_(mutex){//引用只能用 64 | //mutex_ = mutex; 65 | mutex_.Lock(); 66 | } 67 | ~MutexGuard(){ 68 | mutex_.UnLock(); 69 | } 70 | private: 71 | MutexLock &mutex_;//由于mutexLock不允许拷贝，所以用引用 72 | 73 | private: 74 | //禁止copy 75 | MutexGuard(const MutexGuard &); 76 | MutexGuard &operator=(const MutexGuard &); 77 | }; 78 | // 见陈硕的muduo网络库实现 79 | #define MutexGuard(x) do{\ 80 | fprintf(stderr, "Error:line:%d, function:%s(), file:%s\nthis should be used like this:\nMutexGuard lock(your_mutex);\n",\ 81 | __LINE__, __FUNCTION__, __FILE__);\ 82 | }while(0); 83 | 84 | #endif 85 | -------------------------------------------------------------------------------- /conn_pool.cpp: -------------------------------------------------------------------------------- 1 | #include "conn_pool.h" 2 | #include 3 | #include 4 | 5 | ConnPool *ConnPool::conn_pool = NULL; 6 | 7 | ConnPool::ConnPool(const char *hostip, const char *username, const char *password, 8 | int maxSize, int initSize){ 9 | assert(maxSize >= initSize); 10 | assert(maxSize>0 && initSize>0); 11 | 12 | hostip_ = hostip; 13 | username_ = username; 14 | password_ = password; 15 | 16 | maxSize_ = maxSize; 17 | curSize = 0; 18 | InitConnPool(hostip, username, password, initSize); 19 | } 20 | 21 | ConnPool *ConnPool::GetInstance(){ 22 | if(conn_pool == NULL) 23 | conn_pool = new ConnPool(HOST, USERNAME, PASSWORD, MAX_CONNPOOL_SIZE, INIT_CONNPOOL_SIZE); 24 | return conn_pool; 25 | } 26 | 27 | void ConnPool::InitConnPool(const char *hostip, const char *username, const char *password, 28 | int initSize){ 29 | MutexGuard lock(mutex); 30 | MysqlEncap *conn; 31 | try{ 32 | for(int i=0; iConnect(hostip_.c_str(), username_.c_str(), password_.c_str()); 35 | if(conn != NULL){ 36 | connList.push_back(conn); 37 | curSize++; 38 | }else{ 39 | fprintf(stderr,"InitConnPool error\n"); 40 | } 41 | } 42 | }catch(...){ 43 | fprintf(stderr,"InitConnPool error\n"); 44 | } 45 | } 46 | 47 | MysqlEncap* ConnPool::GetOneConn(){ 48 | MysqlEncap *conn; 49 | MutexGuard lock(mutex); 50 | if(connList.size() > 0){//注意区分connlist里面的是可用连接，而cursize表示所有建立的连接 51 | conn = connList.front(); 52 | connList.pop_front(); 53 | //curSize--;//不能-- 54 | }else{ 55 | if(curSize < maxSize_){ 56 | conn = new MysqlEncap; 57 | conn->Connect(hostip_.c_str(), username_.c_str(), password_.c_str()); 58 | if(conn != NULL){ 59 | //connList.push_back(conn);//这里不能加入到队列，直接反给使用者 60 | curSize++; 61 | }else{ 62 | fprintf(stderr,"get conn error\n"); 63 | } 64 | }else{ 65 | return NULL; 66 | } 67 | } 68 | return conn; 69 | } 70 | 71 | 72 | void ConnPool::ReleaseOneConn(MysqlEncap *conn){ 73 | if(conn){ 74 | MutexGuard lock(mutex); 75 | connList.push_back(conn); 76 | } 77 | } 78 | 79 | ConnPool::~ConnPool(){ 80 | DestroyConnPool(); 81 | } 82 | //目前只保证connlist里面空闲连接被释放，剩下的分配出去的连接 83 | //还没有去管，基于不是程序退出不会销毁线程池，所以也没关系 84 | void ConnPool::DestroyConnPool(){ 85 | list::iterator iter; 86 | MutexGuard lock(mutex); 87 | for(iter=connList.begin(); iter!=connList.end(); iter++){ 88 | DestroyConnection(*iter); 89 | } 90 | curSize = 0; 91 | connList.clear(); 92 | } 93 | 94 | void ConnPool::DestroyConnection(MysqlEncap *conn){ 95 | if(conn){ 96 | conn->CloseConnect(); 97 | } 98 | delete conn; 99 | } 100 | 101 | void ConnPool::ShowStatus(){ 102 | printf("+++++++The Pool Status++++++\n"); 103 | printf("curSize: %d\n", curSize); 104 | printf("free conn: %d used conn: %d\n", connList.size(), curSize-connList.size()); 105 | printf("++++++++++ End +++++++++++++\n"); 106 | } 107 | 108 | 109 | 110 | 111 | 112 | 113 | -------------------------------------------------------------------------------- /mysql_encap.cpp: -------------------------------------------------------------------------------- 1 | #include "mysql_encap.h" 2 | #include 3 | #include 4 | #include 5 | #include 6 | 7 | 8 | using namespace std; 9 | 10 | /*构造函数*/ 11 | MysqlEncap::MysqlEncap(){ 12 | isConnected = false; 13 | sql_result = NULL; 14 | mysql_init(&sql_conn); 15 | } 16 | /*析构函数*/ 17 | MysqlEncap::~MysqlEncap(){ 18 | FreeResult(); 19 | CloseConnect(); 20 | } 21 | /**************************************************** 22 | * 建立数据库连接 23 | * ip: 数据库主机ip 24 | * username: 登录mysql用户名 25 | * password: 密码 26 | ****************************************************/ 27 | bool MysqlEncap::Connect(const char *ip, const char *username, const 28 | char *password){ 29 | hostip_ = ip; 30 | username_ = username; 31 | password_ = password; 32 | if(isConnected){ 33 | return true; 34 | } 35 | if(mysql_real_connect(&sql_conn, ip, username, password, 36 | NULL, 0, NULL, 0) == NULL){ 37 | fprintf(stderr, "%s\n", mysql_error(&sql_conn)); 38 | return false; 39 | } 40 | isConnected = true; 41 | printf("connect establish [user:%s]\n",username); 42 | return true; 43 | } 44 | 45 | /************************************************ 46 | * 关闭连接 47 | ************************************************/ 48 | void MysqlEncap::CloseConnect(){ 49 | mysql_close(&sql_conn); 50 | isConnected = false; 51 | } 52 | 53 | /************************************************ 54 | * 重新连接 55 | ************************************************/ 56 | bool MysqlEncap::ReConnect(){ 57 | CloseConnect(); 58 | if(mysql_real_connect(&sql_conn, hostip_.c_str(), username_.c_str(), password_.c_str(), 59 | NULL, 0, NULL, 0) == NULL){ 60 | fprintf(stderr,"Reconnect:%s\n", mysql_error(&sql_conn)); 61 | return false; 62 | } 63 | isConnected = true; 64 | return true; 65 | } 66 | /************************************************ 67 | * 检查连接，如果连接断开则重连 68 | ************************************************/ 69 | 70 | 71 | /************************************************ 72 | * 查询语句 73 | ************************************************/ 74 | bool MysqlEncap::ExecuteQuery(const char *sql){ 75 | printf("sql:%s\n",sql); 76 | assert(sql != NULL); 77 | if(sql == NULL) 78 | return true; 79 | if(!isConnected){ 80 | fprintf(stderr,"connection was not established\n"); 81 | bCommit = false;//如果有事务，出错不能提交 82 | } 83 | try{ 84 | if(mysql_real_query(&sql_conn, sql, strlen(sql)) != 0){ 85 | fprintf(stderr, "select query error\n"); 86 | bCommit = false; 87 | return false; 88 | } 89 | FreeResult(); 90 | sql_result = mysql_store_result(&sql_conn); 91 | } catch(...){ 92 | ReConnect();//这种情况是在，执行语句没有出错的情况下，抛出的异常，另外isConnected = true 93 | isConnected = true; 94 | bCommit = false;//如果有事务，出错不能提交 95 | return false; 96 | } 97 | fieldcnt = mysql_num_fields(sql_result); 98 | mapFiledToIndex.clear(); 99 | MYSQL_FIELD *fields = mysql_fetch_fields(sql_result); 100 | for(int i=0; i= fieldcnt){ 194 | fprintf(stderr,"the index is out of bound"); 195 | return NULL; 196 | } 197 | return sql_row[fieldnum]; 198 | } 199 | 200 | /************************************************* 201 | * 转义字符串,避免特殊字符 202 | * make sure sizeof(to) >= 2*strlen(from)+1 203 | *************************************************/ 204 | void MysqlEncap::EscapeString(char *dest, char *source) { 205 | mysql_real_escape_string(&sql_conn, dest, source, strlen(source)); 206 | } 207 | 208 | 209 | 210 | 211 | 212 | 213 | 214 | 215 | 216 | 217 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 2, June 1991 3 | 4 | Copyright (C) 1989, 1991 Free Software Foundation, Inc., 5 | 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 6 | Everyone is permitted to copy and distribute verbatim copies 7 | of this license document, but changing it is not allowed. 8 | 9 | Preamble 10 | 11 | The licenses for most software are designed to take away your 12 | freedom to share and change it. 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It is safest 289 | to attach them to the start of each source file to most effectively 290 | convey the exclusion of warranty; and each file should have at least 291 | the "copyright" line and a pointer to where the full notice is found. 292 | 293 | {description} 294 | Copyright (C) {year} {fullname} 295 | 296 | This program is free software; you can redistribute it and/or modify 297 | it under the terms of the GNU General Public License as published by 298 | the Free Software Foundation; either version 2 of the License, or 299 | (at your option) any later version. 300 | 301 | This program is distributed in the hope that it will be useful, 302 | but WITHOUT ANY WARRANTY; without even the implied warranty of 303 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 304 | GNU General Public License for more details. 305 | 306 | You should have received a copy of the GNU General Public License along 307 | with this program; if not, write to the Free Software Foundation, Inc., 308 | 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. 309 | 310 | Also add information on how to contact you by electronic and paper mail. 311 | 312 | If the program is interactive, make it output a short notice like this 313 | when it starts in an interactive mode: 314 | 315 | Gnomovision version 69, Copyright (C) year name of author 316 | Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 317 | This is free software, and you are welcome to redistribute it 318 | under certain conditions; type `show c' for details. 319 | 320 | The hypothetical commands `show w' and `show c' should show the appropriate 321 | parts of the General Public License. Of course, the commands you use may 322 | be called something other than `show w' and `show c'; they could even be 323 | mouse-clicks or menu items--whatever suits your program. 324 | 325 | You should also get your employer (if you work as a programmer) or your 326 | school, if any, to sign a "copyright disclaimer" for the program, if 327 | necessary. Here is a sample; alter the names: 328 | 329 | Yoyodyne, Inc., hereby disclaims all copyright interest in the program 330 | `Gnomovision' (which makes passes at compilers) written by James Hacker. 331 | 332 | {signature of Ty Coon}, 1 April 1989 333 | Ty Coon, President of Vice 334 | 335 | This General Public License does not permit incorporating your program into 336 | proprietary programs. If your program is a subroutine library, you may 337 | consider it more useful to permit linking proprietary applications with the 338 | library. If this is what you want to do, use the GNU Lesser General 339 | Public License instead of this License. 340 | 341 | --------------------------------------------------------------------------------