从MySQL数据库读取图片和向数据库插入图片
MySQL数据库中有一个数据类型为Blob类型,此类型为二进制文件类型。下面为从MySQL数据库读取图片和向数据库插入图片的代码,一些的数据库连接和JDBC代码就省去了。
package com.an.jdbc.bean;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import org.junit.Test;
import com.an.jdbc.utils.JDBCUtils;
public class TestBlob {
//向数据库中插入图片
@Test
public void test1() throws Exception{
String sql = "update beauty set photo = ? where id = ?";
Connection connection = JDBCUtils.getConnection();
PreparedStatement ps = connection.prepareStatement(sql);
FileInputStream fis = new FileInputStream("C:\\Users\\Administrator\\Desktop\\1.jpg");
ps.setBlob(1, fis);
ps.setInt(2, 2);
int update = ps.executeUpdate();
System.out.println(update>0?"success":"failure");
JDBCUtils.closeConnection(null, ps, connection);
}
//从数据库中读取一张图片
@Test
public void test2() throws Exception{
String sql = "select photo from beauty where id=?";
Connection connection = JDBCUtils.getConnection();
PreparedStatement ps = connection.prepareStatement(sql);
ps.setInt(1, 2);
ResultSet set = ps.executeQuery();
if(set.next()){
InputStream inputStream = set.getBinaryStream(1);
FileOutputStream fos = new FileOutputStream("src\\copy.jpg");
byte[] b = new byte[1024];
int len = -1;
while((len=inputStream.read(b))!=-1){
fos.write(b, 0, len);
}
fos.close();
inputStream.close();
}
JDBCUtils.closeConnection(null, ps, connection);
}
}
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