python中如何把2个图片,存到mysql中表mtable中id字段为1的一条记录中,存到Blob格式的photo的字段中,请给出代码
时间: 2024-05-01 14:16:22 浏览: 92
以下是一个示例代码,其中假设图片已经被读取为二进制数据并存储在变量image1和image2中:
```python
import mysql.connector
# 连接到MySQL数据库
cnx = mysql.connector.connect(user='username', password='password',
host='localhost', database='dbname')
# 准备INSERT语句,将两张图片存储到id=1的记录中
sql = "UPDATE mtable SET photo = %s, photo2 = %s WHERE id = 1"
# 将二进制数据绑定到SQL语句中
data = (image1, image2)
# 执行SQL语句
cursor = cnx.cursor()
cursor.execute(sql, data)
cnx.commit()
# 关闭数据库连接
cursor.close()
cnx.close()
```
注意,这只是一个示例代码,具体实现可能会因为数据库和图片格式等因素而略有不同。
相关问题
mysql中表mtable中有两个字段id (int),photo (blob);python中如何把2个图片,存到mtable中为id=1的同一条记录中photo的字段中,请给出代码
假设已经连接到了MySQL数据库,表名为mtable,可以使用以下代码将两张图片存储到id为1的记录中:
```python
import mysql.connector
from mysql.connector import Error
# 读取图片文件
with open('photo1.jpg', 'rb') as f1:
photo1 = f1.read()
with open('photo2.jpg', 'rb') as f2:
photo2 = f2.read()
# 连接数据库
try:
connection = mysql.connector.connect(
host='localhost',
database='mydb',
user='root',
password='password'
)
if connection.is_connected():
print('Connected to MySQL database')
# 将图片存储到数据库中
cursor = connection.cursor()
sql = "UPDATE mtable SET photo = %s WHERE id = 1"
values = (photo1 + photo2,)
cursor.execute(sql, values)
connection.commit()
print('Photos saved to database')
except Error as e:
print('Error while connecting to MySQL', e)
finally:
if connection.is_connected():
cursor.close()
connection.close()
print('MySQL connection closed')
```
以上代码将图片文件读取为二进制数据,然后使用UPDATE语句将两张图片拼接为一个二进制字符串,存储到id为1的记录的photo字段中。注意要将两张图片拼接为一个元组再传入execute函数中。
mysql中表mtable中有两个字段id (int),photo (blob);python中如何把2个图片,存到mtable中为id=1的同一条记录中photo的字段中;并且在android中能读取出来,请给出代码
Python代码:
```python
import mysql.connector
# 连接数据库
mydb = mysql.connector.connect(
host="localhost",
user="yourusername",
password="yourpassword",
database="yourdatabase"
)
# 读取图片文件
with open("image1.jpg", "rb") as f:
photo1 = f.read()
with open("image2.jpg", "rb") as f:
photo2 = f.read()
# 将两张图片存入数据库
mycursor = mydb.cursor()
mycursor.execute("UPDATE mtable SET photo = %s WHERE id = 1", (photo1,))
mycursor.execute("UPDATE mtable SET photo = %s WHERE id = 1", (photo2,))
mydb.commit()
```
Android代码:
```java
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.AsyncTask;
import android.os.Bundle;
import android.widget.ImageView;
import androidx.appcompat.app.AppCompatActivity;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
public class MainActivity extends AppCompatActivity {
private ImageView imageView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
imageView = findViewById(R.id.imageView);
// 从数据库中读取图片并显示
new LoadImageTask().execute("http://localhost:8000/get_image.php?id=1");
}
private class LoadImageTask extends AsyncTask<String, Void, Bitmap> {
@Override
protected Bitmap doInBackground(String... urls) {
String imageUrl = urls[0];
Bitmap bitmap = null;
try {
URL url = new URL(imageUrl);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setDoInput(true);
conn.connect();
InputStream is = conn.getInputStream();
bitmap = BitmapFactory.decodeStream(is);
is.close();
} catch (IOException e) {
e.printStackTrace();
}
return bitmap;
}
@Override
protected void onPostExecute(Bitmap bitmap) {
if (bitmap != null) {
imageView.setImageBitmap(bitmap);
}
}
}
}
```
注:Android端的图片加载使用了AsyncTask异步任务,需要注意在Android 11及以上版本中,需要在AndroidManifest.xml中添加以下权限:
```xml
<uses-permission android:name="android.permission.INTERNET" />
```
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