I use the following code to fill a taken picture into a SQLite Blob field:
Question:
How can I empty this Blob, when the picture is removed by the user, i.e. should the PictureBuffer be empty (using = "")? Using this does not empty the field and also does not give any error. What am I doing wrong in this case?
B4X:
OutputStream1.InitializeToBytesArray(1024)
File.Copy2(InputStream1, OutputStream1)
Buffer = OutputStream1.ToBytesArray
Dim MyStringUtilities As StringUtils
Dim PictureBuffer As String = MyStringUtilities.EncodeBase64(Buffer)
MySqlquery = "UPDATE " & DbMainTableName & _
" SET " & MainTableColumnNames(FotoIndex) & " = '" & PictureBuffer & "' " & _
"WHERE " & MainTableColumnNames(0) & " = '" & txtMainTableColumnNames0.Text & _
"' AND " & MainTableColumnNames(3) & " = '" & TxtProjectReferentie.Text & _
"' AND " & MainTableColumnNames(7) & " = '" & TxtSerienummer.Text & "'"
MySql.ExecNonQuery(MySqlquery)Question:
How can I empty this Blob, when the picture is removed by the user, i.e. should the PictureBuffer be empty (using = "")? Using this does not empty the field and also does not give any error. What am I doing wrong in this case?