dbcp连接mysql

import org.apache.commons.dbcp2.BasicDataSource;

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

public class DBCPExample {
    private static BasicDataSource dataSource;

    static {
        dataSource = new BasicDataSource();
        dataSource.setDriverClassName("com.mysql.cj.jdbc.Driver");
        dataSource.setUrl("jdbc:mysql://localhost:3306/mydatabase");
        dataSource.setUsername("username");
        dataSource.setPassword("password");
        dataSource.setInitialSize(5);
        dataSource.setMaxTotal(20);
    }

    public static void main(String[] args) {
        Connection connection = null;
        Statement statement = null;
        ResultSet resultSet = null;

        try {
            connection = dataSource.getConnection();
            statement = connection.createStatement();
            resultSet = statement.executeQuery("SELECT * FROM mytable");

            while (resultSet.next()) {
                // 处理查询结果
            }
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            try {
                if (resultSet != null) resultSet.close();
                if (statement != null) statement.close();
                if (connection != null) connection.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }
}