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ViewsStoring file in PostgreSQL database using NestJS
I have one form in React. It has many fields. once user click on the submit button all the field should be saved in database. It also contains one file attachment(pdf).
I dont know what the datatype of variable which will store file, I should take in entity class. Also what should be the database column type. I am using TypeORM for the same.
@IsNotEmpty()
@IsDate()
endDate: Date;
@Column()
@IsNotEmpty()
@IsString()
personIncharge: string;
@Column()
@IsNotEmpty()
@IsString()
country: string;
@Column()
@IsNotEmpty()
@IsString()
comments: string;
attachFile: string; // Should I take file or string?
2 answers
Answer question0
You will probably find your solution in this StackOverflow comment
Basically, you turn your column type in a blob or longblob in your TypeORM annotation, and then use the type Buffer in your Entity's field
@Column({type: 'longblob'})
attachFile: Buffer;
Then you will be able to serve the file as showed in the post example:
app.get("/file/:id", async (req, res)=>{
try {
const repo = getConnection().getRepository(MYFile)
const result_find = await repo.findOne(req.params.id)
console.log(result_find);
var fileData = result_find.data;
res.writeHead(200, {
'Content-Type': result_find.mimeType,
'Content-Disposition': 'attachment; filename=' + result_find.name,
'Content-Length': fileData.length
});
res.write(fileData);
res.end();
} catch (error) {
console.log(error)
res.send("ERROR")
}
})
0
if you want using string, client must send base64 file to backend.
format: data:(mimetype);(charset),(encoded) -> data:image/png;base64,\ee\9f920d....
here solution, using base64 string
DTO (data transfer object)
import { IsDefined, IsNotEmpty } from 'class-validator';
export class UpdateUserAvatarDto {
@IsDefined()
@IsNotEmpty()
file: string;
}
controller
@UseGuards(JwtAuthGuard)
@Patch('account/avatar')
async updateAvatar(
@User() user: Payload,
@Body() updateUserAvatarDto: UpdateUserAvatarDto,
@Res() res: Response,
) {
try {
const { file } = updateUserAvatarDto;
createFile(file, { prefix: ['user', 'avatar'], name: user.id }); // file is string base64 you can store it to database.
return response(res, HttpStatus.OK, {
message: 'Successfully update avatar',
});
} catch (e) {
console.error(e);
return response(res, HttpStatus.INTERNAL_SERVER_ERROR, {
message: e,
data: null,
});
}
}
if you want to create a file from base64
export const createFile = async (base64, { prefix, name }) => {
const cleanBase64 = base64.split(',')[1];
const buffer = Buffer.from(cleanBase64, 'base64');
const file = await fileType.fromBuffer(buffer);
return fs.writeFileSync(
path.join(
path.resolve('./'),
...['public', ...prefix, `${name}.${file.ext}`],
),
buffer,
);
};