Mysql 驱动程序的程序小结

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;

public class MySQLExample {
    public static void main(String[] args) {
        String url = "jdbc:mysql://localhost:3306/mydatabase";
        String username = "root";
        String password = "password";

        try (Connection conn = DriverManager.getConnection(url, username, password);
             Statement stmt = conn.createStatement()) {
            ResultSet rs = stmt.executeQuery("SELECT * FROM employees");
            while (rs.next()) {
                System.out.println(rs.getString("first_name") + " " + rs.getString("last_name"));
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

import mysql.connector

conn = mysql.connector.connect(
    host="localhost",
    user="root",
    password="password",
    database="mydatabase"
)

cursor = conn.cursor()
cursor.execute("SELECT * FROM employees")

for (first_name, last_name) in cursor:
    print(f"{first_name} {last_name}")

cursor.close()
conn.close()

using MySql.Data.MySqlClient;

class Program
{
    static void Main()
    {
        string connStr = "server=localhost;user=root;database=mydatabase;port=3306;password=password";
        MySqlConnection conn = new MySqlConnection(connStr);

        try
        {
            conn.Open();

            string sql = "SELECT * FROM employees";
            MySqlCommand cmd = new MySqlCommand(sql, conn);
            MySqlDataReader rdr = cmd.ExecuteReader();

            while (rdr.Read())
            {
                Console.WriteLine(rdr["first_name"] + " " + rdr["last_name"]);
            }
            rdr.Close();
        }
        catch (Exception ex)
        {
            Console.WriteLine(ex.ToString());
        }
        conn.Close();
    }
}

#include <mysql_driver.h>
#include <mysql_connection.h>
#include <cppconn/statement.h>
#include <cppconn/resultset.h>

int main() {
    sql::mysql::MySQL_Driver *driver;
    sql::Connection *con;
    sql::Statement *stmt;
    sql::ResultSet *res;

    driver = sql::mysql::get_mysql_driver_instance();
    con = driver->connect("tcp://127.0.0.1:3306", "root", "password");

    con->setSchema("mydatabase");
    stmt = con->createStatement();
    res = stmt->executeQuery("SELECT * FROM employees");

    while (res->next()) {
        std::cout << res->getString("first_name") << " " << res->getString("last_name") << std::endl;
    }

    delete res;
    delete stmt;
    delete con;

    return 0;
}