import java.sql.*;
public class Main {
// MySQL 8.0 以下版本 - JDBC 驱动名及数据库 URL
//static final String JDBC_DRIVER = "com.mysql.jdbc.Driver";
//static final String DB_URL = "jdbc:mysql://localhost:3306/RUNOOB";
// MySQL 8.0 以上版本 - JDBC 驱动名及数据库 URL
static final String JDBC_DRIVER = "com.mysql.cj.jdbc.Driver";
static final String DB_URL = "jdbc:mysql://localhost:3306/?useSSL=false&allowPublicKeyRetrieval=true&serverTimezone=UTC";
// 数据库的用户名与密码,需要根据自己的设置
static final String USER = "root";
static final String PASS = "aaa.1236";
public static void main(String[] args) {
Connection connection = null;
Statement statement = null;
ResultSet resultSet = null;
String sql = "";
try {
// 注册 JDBC 驱动
Class.forName(JDBC_DRIVER);
// 打开链接
connection = DriverManager.getConnection(DB_URL, USER, PASS);
// 实例化Statement对象
statement = connection.createStatement();
// 删除数据库
statement.execute("DROP DATABASE IF EXISTS `services`;");
// 新建数据库
statement.execute("CREATE DATABASE `services` CHARACTER SET 'utf8' COLLATE 'utf8_general_ci';");
// 删除数据表
statement.execute("DROP TABLE IF EXISTS `services`.`websites`;");
// 新建数据表
statement.execute("CREATE TABLE `services`.`websites` (\n" +
" `id` int(2) NOT NULL COMMENT 'id',\n" +
" `name` varchar(255) NOT NULL,\n" +
" `url` varchar(255) NOT NULL,\n" +
" PRIMARY KEY (`id`),\n" +
" UNIQUE INDEX(`id`)\n" +
") ENGINE = InnoDB;");
// 插入记录
statement.execute("INSERT INTO `services`.`websites`(`id`,`name`,`url`) VALUES ('1','百度','https://www.baidu.com/');");
statement.execute("INSERT INTO `services`.`websites`(`id`,`name`,`url`) VALUES ('2','博客园','https://www.cnblogs.com/');");
// 查询记录
statement.execute("SELECT `id`,`name`,`url` FROM `services`.`websites`;");
resultSet = statement.getResultSet();
ResultSetMetaData resultSetMetaData = resultSet.getMetaData();
int cols = resultSetMetaData.getColumnCount();
// 输出所有字段名
for (int i = 1; i <= cols; i++) {
System.out.println(resultSetMetaData.getColumnName(i));
}
// 输出所有数据
while (resultSet.next()) {
System.out.println(resultSet.getString(1));
System.out.println(resultSet.getString(2));
System.out.println(resultSet.getString(3));
}
resultSet.close();
statement.close();
connection.close();
} catch (SQLException se) {
// 处理 JDBC 错误
se.printStackTrace();
} catch (Exception e) {
// 处理 Class.forName 错误
e.printStackTrace();
} finally {
}
System.out.println("Goodbye!");
}
}
标签:execute,Java,String,static,statement,MySQL,services,基本操作,id
From: https://www.cnblogs.com/immengxin/p/16994941.html