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Insert/update TBlobfield (aka image) using sql parameters

由 泪湿孤枕 提交于 2019-11-26 21:54:10
问题 I want to store images in a database using sql but cant seem to get it to work: qry.SQL.Clear; qry.Sql.Add('update tbl set pic = :blobVal where id = :idVal'); qry.Parameters.ParamByName('idVal')._?:=1; .Parameters has no .asinteger like .Param has but .Param isn't compatible with a TADOquery - to workaround I tried: a_TParameter:=qry.Parameters.CreateParameter('blobval',ftBlob,pdinput,SizeOf(TBlobField),Null); a_TParam.Assign(a_TParameter); a_TParam.asblob:=a_Tblob; qry.ExecSql; This also

Save to Local File from Blob

由 混江龙づ霸主 提交于 2019-11-26 21:47:34
问题 I have a difficult question to you, which i'm struggeling on for some time now. I'm looking for a solution, where i can save a file to the users computer, without the local storage, because local storage has 5MB limit. I want the "Save to file"-dialog, but the data i want to save is only available in javascript and i would like to prevent sending the data back to the server and then send it again. The use-case is, that the service im working on is saving compressed and encrypted chunks of the

How to create a Table with a column of type BLOB in a DBAdapter

由 给你一囗甜甜゛ 提交于 2019-11-26 21:43:20
问题 I have a global DBAdapter and also for each Table one. In my global DB-Adapter I added the type "BLOB" to the column. But i don't get what i have to change in my DBAdapter for the specific Table. What I need to change there that it also works with the BLOB type. So here you go: Global DBAdapter: package de.retowaelchli.filterit.database; import android.content.Context; import android.database.SQLException; import android.database.sqlite.SQLiteDatabase; import android.database.sqlite

How to go from Blob to ArrayBuffer

由 耗尽温柔 提交于 2019-11-26 21:19:35
I was studying Blobs, and I noticed that when you have an ArrayBuffer, you can easily convert this to a Blob as follows: var dataView = new DataView(arrayBuffer); var blob = new Blob([dataView], { type: mimeString }); The question I have now is, is it possible to go from a Blob to an ArrayBuffer? The new Response API is capable of decoding data from a (immutable) Blob . This is the Core API which the Fetch API uses. var blob = GetABlobSomehow(); var arrayBuffer = null; /* Use the await keyword to wait for the Promise to resolve */ arrayBuffer = await new Response(blob).arrayBuffer(); //:

How to convert Part to Blob, so I can store it in MySQL?

由 北慕城南 提交于 2019-11-26 21:04:26
问题 How to convert Part to Blob, so I can store it in MySQL? It is an image. Thank you My form <h:form id="form" enctype="multipart/form-data"> <h:messages/> <h:panelGrid columns="2"> <h:outputText value="File:"/> <h:inputFile id="file" value="#{uploadPage.uploadedFile}"/> </h:panelGrid> <br/><br/> <h:commandButton value="Upload File" action="#{uploadPage.uploadFile}"/> </h:form> My bean @Named @ViewScoped public class UploadPage { private Part uploadedFile; public void uploadFile(){ } } 回答1: The

Calculating total data size of BLOB column in a table

由 拟墨画扇 提交于 2019-11-26 20:48:08
问题 I have a table with large amounts of BLOB data in a column. I am writing a utility to dump the data to file system. But before dumping, I need to check if necessary space is available on the disk to export all the blob fields throughout the table. Please suggest an efficient approach to get size of all the blob fields in the table. 回答1: You can use the MySQL function OCTET_LENGTH(your_column_name) . See here for more details. 回答2: select sum(length(blob_column)) as total_size from your_table

Retrieve an Image stored as BLOB on a MYSQL DB

由 半腔热情 提交于 2019-11-26 20:17:41
I'm trying to create a PDF based on the information that resides on a database. Know I need to retrieve a TIFF image that is stored as a BLOB on a mysql database from Java. And I don't know how to do it. The examples I've found shows how to retrieve it and save it as a File (but on disk) and I needed to reside on memory. Table name: IMAGENES_REGISTROS BLOB Field name: IMAGEN Any Ideas? On your ResultSet call: Blob imageBlob = resultSet.getBlob(yourBlobColumnIndex); InputStream binaryStream = imageBlob.getBinaryStream(0, imageBlob.length()); Alternatively, you can call: byte[] imageBytes =

Appending Blob data

由 给你一囗甜甜゛ 提交于 2019-11-26 19:58:09
问题 Is there a function for appending blob data in JavaScript I currently use the following approach: var bb = new Blob(["Hello world, 2"], { type: "text/plain" }); bb = new Blob([bb, ",another data"], { type: "text/plain" }); And BlobBuilder function is not available in Chrome. 回答1: Blobs are "immutable" so you can't change one after making it. Constructing a new Blob that appends the data to an existing blob (as you wrote in your initial question) is a good solution. If you don't need to use

Git - get all commits and blobs they created

由 随声附和 提交于 2019-11-26 19:45:55
问题 Is there a git command that can output for every commit: id subject blobs it created with they path and size (like git ls-tree -l -r <commit> but only for created blobs) 回答1: To get commits (all and output one line per commit): git rev-list --all --pretty=oneline Then split commits by space with limit of 2 and get every commit id and message To get blobs created by commit (recurse to subdirs, show merge commits, detect renames and copies, don't show commit id on first line): git diff-tree -r

Is there any limitation on JavaScript Max Blob size

由 一曲冷凌霜 提交于 2019-11-26 19:45:27
问题 I am trying to download a file using AJAX call. I need to use AJAX call because I have to make a post request along with that I need to send some headers from the client. As Server API is not under our control, we don't have much choice other than using AJAX. In order to show file save dialog, I am converting the byte array to blob to Object URL like shown below var oReq = new XMLHttpRequest(); oReq.open("POST","api/operations/zip", true); oReq.responseType = "arraybuffer"; oReq.onload =
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