package top.qaqaq.P29.blob;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.sql.Blob;
import java.sql.Connection;
import java.sql.Date;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

import org.junit.Test;

import top.qaqaq.P14.util.JDBCUtils;
import top.qaqaq.P17.bean.Customer;

/**
 * 
* @Description	测试使用PreparedStatement操作Blob类型的数据
* @author RichieZhang Email:18358892@qq.com
* @version
* @date 2022年11月27日下午2:45:11
*
 */
public class BlobTest {
	
	//向数据表customers中插入Blob类型的字段
	@Test
	public void testInsert() throws Exception {
		Connection conn = JDBCUtils.getConnection();
		String sql = "insert into customers(name,email,birth,photo) values(?,?,?,?)";
		
		PreparedStatement ps = conn.prepareStatement(sql);
		
		ps.setObject(1, "王五");
		ps.setObject(2, "zhang@126.com");
		ps.setObject(3, "1992-09-08");
		FileInputStream is = new FileInputStream(new File("电脑壁纸.jpg"));
		ps.setBlob(4, is);
		
		ps.execute();
		
		JDBCUtils.closeResource(conn, ps);
	}
	
	//查询数据表customers中Blob类型的字段
	@Test
	public void testQuery() {
		Connection conn = null;
		PreparedStatement ps = null;
		InputStream is = null;
		FileOutputStream fos = null;
		ResultSet rs = null;
		try {
			conn = JDBCUtils.getConnection();
			String sql = "select id,name,email,birth,photo from customers where id = ?";
			ps = conn.prepareStatement(sql);
			ps.setInt(1, 22);
			
			rs = ps.executeQuery();
			if(rs.next()) {
				//方式一：
//				int id = rs.getInt(1);
//				String name = rs.getString(2);
//				String email = rs.getString(3);
//				Date birth = rs.getDate(4);
				//方式二：
				int id = rs.getInt("id");
				String name = rs.getString("name");
				String email = rs.getString("email");
				Date birth = rs.getDate("birth");
				
				Customer cust = new Customer(id, name, email, birth);
				System.out.println(cust);
				
				//将Blob类型的字段下载下来，以文件的方式保存在本地
				Blob photo = rs.getBlob("photo");
				is = photo.getBinaryStream();
				fos = new FileOutputStream("zhang.jpg");
				byte[] buffer = new byte[1024];
				int len;
				while((len = is.read(buffer)) != -1) {
					fos.write(buffer,0,len);
				}
				
			}
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			try {
				if(is != null)
					is.close();
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
			
			try {
				if(fos != null)
					fos.close();
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
			
			JDBCUtils.closeResource(conn, ps, rs);
		}
		
	}
	
}