blob

问题 I would like to change to the new HttpClient. Until now I handle file downloads the following: getXlsx (): Observable<any> { return this.http.get('api/xlsx', { responseType: ResponseContentType.ArrayBuffer, // set as ArrayBuffer instead of Json }) .map(res => downloadFile(res, 'application/xlsx', 'export.xlsx')) .catch(err => handleError(err)); } export function downloadFile(data: any, type: string, filename: string): string { const blob = new Blob([data._body], { type }); const url = window

问题 REST API has been released in february to set blob CORS property, but this hasn't been implemented for NodeJS yet. Since I need this feature, I tried to implement it in a module for my azure website running NodeJS. Based on REST API documentation to change CORS properties and to generate authentification key, on this implementation of authentification key generation using NodeJS, I tried to follow the accepted answer from this post, but it didn't work for me. Here is what I've got in

问题 There seems to be a 1MB limit on Android's Cursor Window size which limits the ability to read BLOBs from SQLite. I know you may say we should not store BLOBs in database but by definition, BLOB is considered a Binary Large Object and if there was no need to store them in database, there was no need to implement such object type in any database engines. The 1 MB limit on the implementation of Cursor however, seems to be insufficient in almost all cases. I need to store my binary data for

问题 I have managed objects that have image properties. Since storing large blobs in CoreData is a bad idea, I'm trying to use the built-in CoreData option " Store in External Record File " which you can see in the Data Model Inspector. Despite enabling this option, I do not see any image data being stored externally. Judging by the size, it seems like they are still being saved in the sqlite file. What is the issue? 回答1: If your store type is NSSQLiteStoreType , your attribute is

问题 I have a file. I want to get its contents into a blob column in my oracle database or into a blob variable in my PL/SQL program. What is the best way to do that? 回答1: To do it entirely in PL/SQL, the file would need to be on the server, located in a directory which you'd need to define in the database. Create the following objects: CREATE OR REPLACE DIRECTORY BLOB_DIR AS '/oracle/base/lobs' / CREATE OR REPLACE PROCEDURE BLOB_LOAD AS lBlob BLOB; lFile BFILE := BFILENAME('BLOB_DIR', 'filename')

问题 I need download an excel from my backend, its returned a file. When I do the request I get the error: TypeError: You provided 'undefined' where a stream was expected. You can provide an Observable, Promise, Array, or Iterable. My code is: this.http.get(`${environment.apiUrl}/...`) .subscribe(response => this.downloadFile(response, "application/ms-excel")); I tried get and map(...) but didn't work. Details: angular 5.2 references: import { HttpClient } from '@angular/common/http'; import 'rxjs

问题 A clueless Python newbie needs help. I muddled through creating a simple script that inserts a binary file into a blog field in a SQLite database: import sqlite3 conn = sqlite3.connect('database.db') cursor = conn.cursor() input_note = raw_input(_(u'Note: ')) input_type = 'A' input_file = raw_input(_(u'Enter path to file: ')) with open(input_file, 'rb') as f: ablob = f.read() f.close() cursor.execute("INSERT INTO notes (note, file) VALUES('"+input_note+"', ?)", [buffer(ablob)]) conn.commit()

问题 I'm getting the same results from select length(column_name) from table as select dbms_lob.getlength(column_name) from table However, the answers to this question seem to favor using dbms_lob.getlength() . Is there any benefit to using dbms_lob.getlength() ? If it changes the answer, I know all of the blobs are .bmp images (never worked with blobs before). 回答1: length and dbms_lob.getlength return the number of characters when applied to a CLOB (Character LOB). When applied to a BLOB (Binary

问题 I am having trouble setting the type of a String, it goes like public void setTextDesc(String textDesc) { this.textDesc = textDesc; } @Column(name="DESC") @Lob public String getTextDesc() { return textDesc; } and it didn't work, I checked the mysql schema and it remains varchar(255), I also tried, @Column(name="DESC", length="9000") or @Column(name="DESC") @Type(type="text") I am trying to make the type to be TEXT, any idea would be well appreciated! 回答1: You said "I checked the mysql schema

问题 I have this code that converts a Treemap into bytes and store them in database (Oracle 11g). Now that storage seems to be working fine. I want to retrieve the map now, but it is in bytes in blob field. How can I retrieve and re-construct the map? The code for storing the map is: public void StoreMapDB(TreeMap<DateTime, Integer> map) throws IOException, FileNotFoundException{ try { Connection con = null; Class.forName("oracle.jdbc.driver.OracleDriver"); con=DriverManager.getConnection( "jdbc