从一个select查询中获取多个结果

import pymysql

# 连接数据库
conn = pymysql.connect(host='localhost', user='username', password='password', database='database_name')
cursor = conn.cursor()

# 执行查询
sql = "SELECT * FROM users WHERE age > 18"
cursor.execute(sql)

# 获取多个结果
results = cursor.fetchall()

# 处理结果
for row in results:
    # 处理每一行数据
    print(row)

# 关闭数据库连接
cursor.close()
conn.close()

import java.sql.*;

public class Main {
    public static void main(String[] args) {
        Connection conn = null;
        Statement stmt = null;
        ResultSet rs = null;

        try {
            // 连接数据库
            conn = DriverManager.getConnection("jdbc:mysql://localhost/database_name", "username", "password");

            // 创建Statement对象
            stmt = conn.createStatement();

            // 执行查询
            String sql = "SELECT * FROM users WHERE age > 18";
            rs = stmt.executeQuery(sql);

            // 处理结果
            while (rs.next()) {
                // 处理每一行数据
                System.out.println(rs.getString("name"));
            }
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            // 关闭资源
            try {
                if (rs != null) rs.close();
                if (stmt != null) stmt.close();
                if (conn != null) conn.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }
}