{"id":10398,"date":"2022-09-23T15:16:54","date_gmt":"2022-09-23T09:46:54","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-how-to-download-all-ms-access-attachments-using-r-closed\/"},"modified":"2022-09-23T15:16:54","modified_gmt":"2022-09-23T09:46:54","slug":"solved-how-to-download-all-ms-access-attachments-using-r-closed","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-how-to-download-all-ms-access-attachments-using-r-closed\/","title":{"rendered":"[Solved] how to download all MS access attachments using R [closed]"},"content":{"rendered":"

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Attachments in MS Access are special data types that actually involve nested tables for metadata (filename and filedata) information. Hence, you cannot access this data with DML SQL statements alone via RODBC but can using a COM interface, specifically connecting to the DAO SaveToFile()<\/a> method. <\/p>\n

Consider the following using the RDCOMClient<\/code> package which allows interfacing to the Access Object Library. Do note: in order to run the below code, you must have MSAccess.exe (the MS Office GUI program) installed and not just the .accdb file. In the SQL query below, ColAttach<\/em> is the name of the attachment field in your table and you must use those qualifiers .filedata<\/em> and .filename<\/em>. DAO recordset field numbers are zero based (hence the 0 and 1).<\/p>\n

library(RDCOMClient)\n\n# INITIALIZING OBJECTS\naccApp <- COMCreate(\"Access.Application\")\naccApp$OpenCurrentDatabase(\"C:\\\\Path\\\\To\\\\Database.accdb\")\ndocmd <-  accApp[[\"DoCmd\"]]\ndb <- accApp$CurrentDb()\n\nrst <- db$OpenRecordset(\"SELECT ColAttach.filedata, ColAttach.filename FROM TblAttach\")\n\nwhile(rst$EOF() == FALSE){     \n  rst$Fields(0)$SaveToFile(paste0(\"C:\\\\Path\\\\To\\\\Output_\", rst$Fields(1)$Value()))      \n  rst$MoveNext()\n}\n\n# CLOSING OBJECTS\nrst$close()\ndocmd$CloseDatabase()\naccApp$Quit()\n\n# RELEASING RESOURCES\naccApp <- db <- docmd <- rst <- NULL    \nrm(rst, db, accApp)\ngc()\n<\/code><\/pre>\n
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For multiple attachments, loop through the child recordset on each filename<\/em> and filedata<\/em> values (notice the different SQL). Be sure to check if file exists and destroy accordingly else you will receive a COM error:<\/p>\n
rst <- db$OpenRecordset(\"SELECT ID, ColAttach FROM TblAttach\")\n\nwhile(rst$EOF() == FALSE){    \n  childRS <- rst[['ColAttach']]$Value()\n\n  while(childRS$EOF() == FALSE){\n    if (file.exists(paste0(\"C:\\\\Path\\\\To\\\\Output_\", childRS[[\"filename\"]]$Value()))) {\n      unlink(paste0(\"C:\\\\Path\\\\To\\\\Output_\", childRS[[\"filename\"]]$Value()))\n    }\n\n    childRS[[\"filedata\"]]$SaveToFile(paste0(\"C:\\\\Path\\\\To\\\\Output_\", \n                                     childRS[[\"filename\"]]$Value()))\n    childRS$MoveNext()\n  }\n\n  rst$MoveNext()\n}\n<\/code><\/pre>\n<\/p><\/div>\n
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solved how to download all MS access attachments using R [closed] <\/p>\n","protected":false},"excerpt":{"rendered":"
[ad_1] Attachments in MS Access are special data types that actually involve nested tables for metadata (filename and filedata) information. Hence, you cannot access this data with DML SQL statements alone via RODBC but can using a COM interface, specifically connecting to the DAO SaveToFile() method. Consider the following using the RDCOMClient package which allows … Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[474,321],"class_list":["post-10398","post","type-post","status-publish","format-standard","hentry","category-solved","tag-ms-access-2010","tag-r"],"yoast_head":"\n[Solved] how to download all MS access attachments using R [closed] - JassWeb<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jassweb.com\/solved\/solved-how-to-download-all-ms-access-attachments-using-r-closed\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] how to download all MS access attachments using R [closed] - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] Attachments in MS Access are special data types that actually involve nested tables for metadata (filename and filedata) information. Hence, you cannot access this data with DML SQL statements alone via RODBC but can using a COM interface, specifically connecting to the DAO SaveToFile() method. Consider the following using the RDCOMClient package which allows ... 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