什么是JDBC:java连接数据库!
添加jar包
<dependencies>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.33</version>
</dependency>
</dependencies>
外部库
小小的测试
public class TestJdbc {
public static void main(String[] args) throws SQLException, ClassNotFoundException {
// 配置信息
String url = "jdbc:mysql://localhost:3306/jdbc?useUnicode=true&characterEncoding=utf-8";
String username = "root";
String password = "123456";
// 1.加载驱动
Class.forName("com.mysql.jdbc.Driver");
// 2.连接数据库 代表数据库
Connection connection = DriverManager.getConnection(url, username, password);
// 3.向数据库发送SQL的对象Statement :CRUD
Statement statement = connection.createStatement();
// 4.编写SQL
String sql = "select * from users";
// 5.执行sql 返回结果
ResultSet resultSet = statement.executeQuery(sql);
while (resultSet.next()){
System.out.println("id="+resultSet.getObject("id"));
System.out.println("name="+resultSet.getObject("name"));
System.out.println("password="+resultSet.getObject("password"));
System.out.println("email="+resultSet.getObject("email"));
System.out.println("birthday="+resultSet.getObject("birthday"));
}
// 6.关闭连接,释放资源
resultSet.close();
statement.close();
connection.close();
}
}
标签:JDBC,String,resultSet,System,getObject,println,out
From: https://www.cnblogs.com/hashifei/p/18179311