JDBC

package jdbcdemo1;

import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

import java.sql.Connection;

/**
 * @author Administrator
 * 演示示例1：使用纯Java方式连接数据
 */
/**
 * @author Administrator alt+shift+j
 */
public class demo1 {

    public static void main(String[] args) {
        Connection conn = null;
        PreparedStatement ps = null;
        ResultSet rs = null;
        try {
            Class.forName("com.mysql.jdbc.Driver");
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
            System.out.println("建立连接失败");
        }

        try {
            conn = DriverManager.getConnection(
                    "jdbc:mysql://localhost:3306/hello?useUnicode=true&characterEncoding=utf-8", "root", "123456");
            System.out.println("建立连接成功");
            // 3.创建ps ，代表预编译的sql对象
            ps = conn.prepareStatement("select* from student");
            // 4.执行
            rs = ps.executeQuery();
            while (rs.next()) {
                System.out.println(rs.getInt("id") + " " + rs.getString("name") + rs.getFloat("Chinese"));
            }
        } catch (SQLException e) {
            e.printStackTrace();
            System.out.println("建立连接失败");
        } finally {
            try {
                conn.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
            if (rs != null) {
                try {
                    rs.close();
                } catch (Exception e2) {
                    // TODO: handle exception
                    e2.printStackTrace();
                }
                rs = null;
            }
            if (ps != null) {
                try {
                    ps.close();
                } catch (Exception e2) {
                    // TODO: handle exception
                    e2.printStackTrace();
                }
                ps = null;
            }

        }

    }
}