插入与读取Blob类型数据

BlobTest

package com.aff.PreparedStatement;
import java.io.File;
import java.io.FileInputStream;
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 org.junit.Test;
import com.aff.bean.Customer;
import com.aff.utils.JDBCUtils;

//向数据表Customers插入Blob类型的字段
public class BlobTest {

    // 向数据表customers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, "何苗苗");
        ps.setObject(2, "hemiao@163.com");
        ps.setObject(3, "1996-2-3");
        FileInputStream is = new FileInputStream(new File("1.jpg"));
        ps.setObject(4, is);
        ps.execute();
        JDBCUtils.closeResource(conn, ps);
    }

    
    
    //查询数据表customers中的Blob类型字段
    @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, 20);
            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的字段下载下来，以文件的方式保存到本地
                Blob photo = rs.getBlob("photo");
                is = photo.getBinaryStream();
                fos = new FileOutputStream(new File("mm.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) {
                e.printStackTrace();
            }
            try {
                if(fos !=null)
                fos.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
            JDBCUtils.closeResource(conn, ps, rs);
        }
    }
}

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