JDBC连接数据库的六大步骤

1. 加载驱动

Class.forName("com.mysql.jdbc.Driver");

2. 创建连接对象

String url = "jdbc:mysql://localhost:3306/test";
String user = "root";
String password = "123456";
Connection conn = DriverManager.getConnection(url, user, password);

3. 创建执行sql语句的对象，传参。

Statement statement = conn.createStatement();

4. 执行sql语句，获取返回的结果集。

String sql = " select * from  test";
ResultSet resultSet = statement.executeQuery(sql);

5. 解析结果集

while(resultSet.next()) {
    resultSet.getInt(1);
    resultSet.getString(2);
}

6.释放资源

resultSet.close();
statement.close();
conn.close();

7.代码示例：

public static void main(String[] args) throws Exception {
    // 1. 加载驱动
    Class.forName("com.mysql.jdbc.Driver");
    // 2.创建连接对象
    String url = "jdbc:mysql://localhost:3306/test";
    String user = "root";
    String password = "123456";
    Connection conn = DriverManager.getConnection(url, user, password);
    // 3. 创建执行sql语句的对象，传参
    Statement statement = conn.createStatement();
    // 4.执行sql语句
    String sql = " select * from test";
    ResultSet resultSet = statement.executeQuery(sql);
    // 5. 解析结果集
    while(resultSet.next()) {
        resultSet.getInt(1);
        resultSet.getString(2);
    }
    // 6.释放资源
    resultSet.close();
    statement.close();
    conn.close();
}