A library for MySQL that implements a simpler framework for MySQL Connector++
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mySQL/README.md

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# A library for MySQL that implements a simpler framework for MySQL Connector++
A small framework for basic MySQL database operations via MySQL/Connector++
## Features
- Object oriented
- Active connection pool
- Retries to connect
- Native C++ containers: vector, tuple
- Response object
- Thread safe
- Exceptions and log error callback
- Can use external time loop for connection management
## Installation
First install dependency MySQL/Connector++
```
sudo apt install libmysqlcppconn-dev
```
Just download the latest release and unzip it into your project. You can turn it on with:
```
#include "mysql/lib/mysql.hpp"
using namespace marcelb;
```
## Usage
### Internal engine
It internally initializes a single thread that periodically checks the states of the connection pool, adds new ones as needed, and cleans up inactive ones.
```c++
#include "../lib/mysql.hpp"
using namespace marcelb::mysql;
/**
* Init
*/
MySQL mydb("tcp://192.168.2.10:3306", "user_nm", "passss", "my_db", 5);
/**
* Use ------------------
*/ | |
------------------ |
try { | | | |
// execute | | | |
auto response = mydb.exec<int,string>("SELECT id,domain FROM records WHERE enabled = 0;");
// response is MySQL_Res<int,string> type
// check is execute
cout << response.affected << " " << response.have_result << endl;
cout << response.rows << " " << response.columns << endl;
for (auto row : response) { // row is tuple<int,string> type
cout << get<0>(row) << " " << get<1>(row) << endl;
}
// access columns name
for (auto column_name : response.columns_name) {
cout << column_name << endl;
}
} catch (const string err) {
cout << err << endl;
}
```
### External engine
As I developed quite a few wrappers that have some internal thread, I realized that it was inefficient and made it possible to call the necessary functions periodically outside (one thread per whole application or timer (ASIO), or my asynco wrapper).
```c++
#include "../lib/mysql.hpp"
using namespace marcelb::mysql;
#include "../../asynco/lib/timers.hpp"
using namespace marcelb::asynco;
/**
* Init
*/
MySQL mydb("tcp://192.168.2.10:3306", "user_nm", "passss", "my_db", 5, time_loop_type::external);
periodic mysql_maintenance ( [&mydb] () {
mydb.periodic_maintenance();
}, MYSQL_PERIODIC_INTERNAL_TIME);
mydb.set_on_error( [](const string& error) {
cout << error << endl; // print or log
});
/**
* You can call multiple queries asynchronously
*/
auto a1 = atask ( [&mydb] () {
try {
auto response = mydb.exec<int,string>("SELECT id,domain FROM records WHERE enabled = 1;");
for (auto row : response) {
cout << get<0>(row) << " " << get<1>(row) << endl;
}
} catch (const string err) {
cout << err << endl;
}
});
auto a2 = atask ( [&mydb] () {
try {
auto response = mydb.exec<string,string>("SELECT zonename,auth_key FROM zones;");
for (auto row : response) {
cout << get<0>(row) << " " << get<1>(row) << endl;
}
} catch (const string err) {
cout << err << endl;
}
});
auto a3 = atask ( [&mydb] () {
try {
auto response = mydb.exec<string,string>("SELECT username,email FROM users WHERE enabled = 1;");
for (auto row : response) {
cout << get<0>(row) << " " << get<1>(row) << endl;
}
} catch (const string err) {
cout << err << endl;
}
});
wait(a1);
wait(a2);
wait(a3);
```
## License
[APACHE 2.0](http://www.apache.org/licenses/LICENSE-2.0/)
## Support & Feedback
For support and any feedback, contact the address: marcelb96@yahoo.com.
## Contributing
Contributions are always welcome!
Feel free to fork and start working with or without a later pull request. Or contact for suggest and request an option.