1.加载驱动(mysql的驱动是com.mysql.jdbc.Driver,SqlServer的驱动是 com.microsoft.sqlserver.jdbc.SQLServerDriver)

2.加载数据库的连接(url, username,password)

3.编写sql语句(String sql="select * from grade where gradeName = ?";)

4.遍历查询结果 【while (resultSet.next()) {
System.out.println(resultSet.getInt("gradeId") + " " + resultSet.getString("gradeName"));
}】

5.关闭资源(从后向前关闭资源 )

public class Test {
public static void main(String[] args) {
 Connection connection = null;
 PreparedStatement preparedStatement = null;
 ResultSet resultSet = null;
 try {
  // 加载数据库驱动
  Class.forName("com.mysql.jdbc.Driver");
  // 通过驱动管理类获取数据库链接
  connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/myschool?characterEncoding=utf-8", "root", "root");
  // 定义sql语句 ?表示占位符
  String sql = "select * from grade  where gradeName = ?";
  // 获取预处理statement
  preparedStatement = connection.prepareStatement(sql);
  // 设置参数,第一个参数为sql语句中参数的序号(从1开始),第二个参数为设置的参数值
  preparedStatement.setString(1, "二年级");
  // 向数据库发出sql执行查询,查询出结果集
  resultSet = preparedStatement.executeQuery();
  // 遍历查询结果集
  while (resultSet.next()) {
   System.out.println(resultSet.getInt("gradeId") + "  " + resultSet.getString("gradeName"));
  }
 } catch (Exception e) {
  e.printStackTrace();
 } finally {
  // 释放资源
  if (resultSet != null) {
   try {
    resultSet.close();
   } catch (SQLException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
   }
  }
  if (preparedStatement != null) {
   try {
    preparedStatement.close();
   } catch (SQLException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
   }
  }
  if (connection != null) {
   try {
    connection.close();
   } catch (SQLException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
   }
  }
 }
}
}
登录后复制

以上就是Java中关于jdbc的使用详解的详细内容,更多请关注Work网其它相关文章!

09-11 05:34