Upload images into a MySQL database using VC++

• Download library files - 7.75 KB
• Download source - 7.29 KB

Introduction

This article explains uploading image files into a MysQL database using the MySQL C/C++ libraries or MySQL ODBC drivers. When I try to upload image files into MySQL, I was able to read it as bytes or characters but I couldn't insert an image into a MySQL BLOB field using the ExecuteSQL function in the CDatabase class.

Image files contain special characters especially escape sequences. If we want to upload an image file, read it as a string or character constants, and replace all (\) with (\\). My library does this as well. My library function converts unformatted data into formatted data. We can then easily upload it to a MySQL database.

Using the code

The downloadable zip file contains...

1. mysqlfileimportexport.dll
2. mysqlfileimportexport.lib
3. mysqlfileimportexport.h

The following code snippet describes how to use mysqlfileimportexport.dll.

Class name: Cmysqlfileimportexport

Method: blob_Import

• Step 1: Include this header file and library file into your code.
C++

#include "mysqlfileimportexport.h"   
#pragma comment(lib,mysqlfileimportexport.lib)

• Step 2: Write the code for your database connection.
C++

CDatabase db_Obj;

//Database connection code here
db.Obj.OpenEx(...)

• Step 3: Include these lines into your code:
C++

Cmysqlfileimportexport lib_Obj; 
LPSTR Buffer = NULL;
int iReturnValue = lib_Obj.blob_Import("c:\\xx\\yyy.abc",&Buffer);
//If return 0 success, otherwise failiure.

CString sQuery;
sQuery.Format("INSERT INTO tablename fieldname(LONGBLOB) VALUES('%s')", Buffer);

• Step 4: Execute the query using the database connection variable.
C++

db_Obj.ExecuteSQL(sQuery);
...

Note

Don't forget to add mysqlfileimportexport.dll in your project directory.