IDEA连接MySQL数据库的4种方法图文教程

import java.sql.Connection;
import java.sql.DriverManager;

public class HelloConnection1 {
    public static void main(String[] args) {

        try {
            //1.加载驱动
            Class.forName("com.mysql.jdbc.Driver");
            //2.获取连接
            //jdbc:mysql://localhost:3306/test
            // 技术名字  ：连接的数据库：//ip：端口/数据库名
            Connection connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/test","root","abc123");
            System.out.println(connection);
        } catch (Exception e) {
            e.printStackTrace();
        }

    }
}

jdbc.driverClass=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/test
jdbc.user=root
jdbc.poassworld=abc123

import java.io.InputStream;
import java.sql.Connection;
import java.sql.DriverManager;
import java.util.Properties;

public class HelloConnection2 {
    public static void main(String[] args) {
        Properties pro=new Properties();
        try {
            InputStream resourceAsStream = HelloConnection2.class.getClassLoader().getResourceAsStream("jdbc.properties");

            pro.load(resourceAsStream);

            String className = pro.getProperty("jdbc.driverClass");
            String url = pro.getProperty("jdbc.url");
            String user=pro.getProperty("jdbc.user");
            String password = pro.getProperty("jdbc.poassworld");

            Class.forName(className);
            Connection connection = DriverManager.getConnection(url, user, password);
            System.out.println(connection);

        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

import com.mchange.v2.c3p0.ComboPooledDataSource;

import java.sql.Connection;
public class HelloConnection3 {
    public static void main(String[] args) {
        ComboPooledDataSource cpds = new ComboPooledDataSource();
        try {
            cpds.setDriverClass( "com.mysql.jdbc.Driver" ); //loads the jdbc driver

            cpds.setJdbcUrl( "jdbc:mysql://localhost:3306/test" );
            cpds.setUser("root");
            cpds.setPassword("abc123");
            Connection connection = cpds.getConnection();
            System.out.println(connection);

        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

import com.mchange.v2.c3p0.ComboPooledDataSource;

import java.sql.Connection;
import java.sql.SQLException;

public class HelloConnection4 {
    public static void main(String[] args) {
        ComboPooledDataSource cpds= new ComboPooledDataSource("hello");
        try {
            Connection connection = cpds.getConnection();
            System.out.println(connection);
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}