如何使用Python在 SQLite 中插入图像？

在本文中，我们将讨论如何使用Python的sqlite3模块在 SQLite 中插入图像。

执行：

1. 使用Python代码设置与 SQLite 数据库的连接。

sqliteConnection = sqlite3.connect('SQLite_Retrieving_data.db')
cursor = sqliteConnection.cursor()

2. 我们需要定义一个INSERT 查询来将BLOB 数据插入到表中。

sqlite_insert_blob_query = """ INSERT INTO Student
                                 (name, img) VALUES (?, ?)"""

3. 通过调用这个convertToBinaryData()函数将人类可读的文件转换为二进制数据，并将其存储为empPhoto变量，

empPhoto = convertToBinaryData(photo)

4.一旦文件转换成二进制格式，现在让我们将数据转换成元组格式，

data_tuple = (name, empPhoto)

5. 使用cursor.execute()在Python执行SELECT 查询。

cursor = sqliteConnection.cursor()
cursor.execute(sqlite_insert_blob_query, data_tuple)

6. 使用sqliteConnection.commit()保存我们所做的更改。

sqliteConnection.commit()

7. 创建一个函数，将人类可读数据转换为二进制格式，以便将其存储到数据库中。

def convertToBinaryData(filename):

  # Convert binary format to images or files data
  with open(filename, 'rb') as file:
      blobData = file.read()
  return blobData

8.关闭游标连接和MySQL数据库。

if sqliteConnection:
    sqliteConnection.close()
    print("the sqlite connection is closed")

下面是实现。

Python3

import sqlite3
  
  
# Function for Convert Binary Data 
# to Human Readable Format
def convertToBinaryData(filename):
      
    # Convert binary format to images 
    # or files data
    with open(filename, 'rb') as file:
        blobData = file.read()
    return blobData
  
  
def insertBLOB(name, photo):
    try:
          
        # Using connect method for establishing
        # a connection
        sqliteConnection = sqlite3.connect('SQLite_Retrieving_data.db')
        cursor = sqliteConnection.cursor()
        print("Connected to SQLite")
          
        # insert query
        sqlite_insert_blob_query = """ INSERT INTO Student
                                  (name, img) VALUES (?, ?)"""
          
        # Converting human readable file into 
        # binary data
        empPhoto = convertToBinaryData(photo)
          
        # Convert data into tuple format
        data_tuple = (name, empPhoto)
          
        # using cursor object executing our query
        cursor.execute(sqlite_insert_blob_query, data_tuple)
        sqliteConnection.commit()
        print("Image and file inserted successfully as a BLOB into a table")
        cursor.close()
  
    except sqlite3.Error as error:
        print("Failed to insert blob data into sqlite table", error)
      
    finally:
        if sqliteConnection:
            sqliteConnection.close()
            print("the sqlite connection is closed")
  
insertBLOB("Smith", "D:\Internship Tasks\GFG\images\One.png")
insertBLOB("David", "D:\Internship Tasks\GFG\images\person.png")

输出：

以上Python程序的输出

让我们使用带有正确格式命令的SELECT查询检查数据库中的输出，

数据库内输出