Import Excel Data into PostgreSQL 9 3

Question

I ve developed a huge table in excel and now facing problem in transferring it into the postgresql database  I ve downloaded the odbc software and I m able to open table created in postgresql with excel  However  I m not able to do it in a reverse manner which is creating a table in excel and open it in the postgresql  So I would like to know it is can be done in this way or is there any alternative ways that can create a large table with pgAdmin III cause inserting the data raw by raw is quite tedious   Thanks in advance for all the helps

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It is possible using ogr2ogr   C  Program Files PostgreSQL 12 bin ogr2ogr exe -f  PostgreSQL  PG  host someip user someuser dbname somedb password somepw  C  folder excelfile xlsx -nln newtablenameinpostgres -oo AUTODETECT TYPE YES    Not sure if ogr2ogr is included in postgres installation or if I got it with postgis extension

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The typical answer is this    In Excel  File Save As  select CSV  save your current sheet  transfer to a holding directory on the Pg server the postgres user can access in PostgreSQL   COPY mytable FROM   path to csv file  WITH CSV HEADER  -- must be superuser    But there are other ways to do this too   PostgreSQL is an amazingly programmable database   These include    Write a module in pl javaU  pl perlU  or other untrusted language to access file  parse it  and manage the structure  Use CSV and the fdw file to access it as a pseudo-table Use DBILink and DBD  Excel Write your own foreign data wrapper for reading Excel files    The possibilities are literally endless

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You can handle loading the excel file content by writing Java code using Apache POI library  https   poi apache org    The library is developed for working with MS office application data including Excel    I have recently created the application based on the technology that will help you to load Excel files to the Postgres database  The application is available under  http   www abespalov com   The application is tested only for Windows  but should work for Linux as well    The application automatically creates necessary tables with the same columns as in the Excel files and populate the tables with content  You can export several files in parallel  You can skip the step to convert the files into the CSV format  The application handles the xls and xlsx formats   Overall application stages are      Load the excel file content  Here is the code depending on file extension        fileExtension   FilenameUtils getExtension inputSheetFile getName         if  fileExtension equalsIgnoreCase  xlsx              workbook   createWorkbook openOPCPackage inputSheetFile          else           workbook                createWorkbook openNPOIFSFileSystemPackage inputSheetFile           sheet   workbook getSheetAt 0         Establish Postgres JDBC connection  Create a Postgres table Iterate over the sheet and inset rows into the table  Here is a piece of Java code         Iterator lt Row gt  rowIterator   InitInputFilesImpl sheet rowIterator       skip a header if  rowIterator hasNext          rowIterator next      while  rowIterator hasNext          Row row    Row  rowIterator next           inserting rows              Here you can find all Java code for the application created for exporting excel to Postgres  https   github com palych-piter Excel2DB

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As explained here http   www postgresonline com journal categories journal archives 339-OGR-foreign-data-wrapper-on-Windows-first-taste html  With ogr fdw module  its possible to open the excel sheet as foreign table in pgsql and query it directly like any other regular tables in pgsql  This is useful for reading data from the same regularly updated table  To do this  the table header in your spreadsheet must be clean  the current ogr fdw driver can t deal with wide-width character or new lines etc  with these characters  you will probably not be able to reference the column in pgsql due to encoding issue   Major reason I can t use this wonderful extension    The ogr fdw pre-build binaries for windows are located here http   winnie postgis net download windows pg96 buildbot extras  change the version number in link to download corresponding builds  extract the file to pgsql folder to overwrite the same name sub-folders  restart pgsql  Before the test drive  the module needs to be installed by executing   CREATE EXTENSION ogr fdw    Usage in brief    use ogr fdw info exe to prob the excel file for sheet name list  ogr fdw info -s  C  excel xlsx   use  ogr fdw info exe -l  to prob a individual sheet and generate a table definition code   ogr fdw info -s  C  excel xlsx  -l  sheetname     Execute the generated definition code in pgsql  a foreign table is created and mapped to your excel file  it can be queried like regular tables    This is especially useful  if you have many small files with the same table structure  Just change the path and name in definition  and update the definition will be enough   This plugin supports both XLSX and XLS file  According to the document it also possible to write data back into the spreadsheet file  but all the fancy formatting in your excel will be lost  the file is recreated on write   If the excel file is huge  This will not work  which is another reason I didn t use this extension  It load data in one time   But this extension also support ODBC interface  it should be possible to use windows  ODBC excel file driver to create a ODBC source for the excel file and use ogr fdw or any other pgsql s ODBC foreign data wrapper to query this intermediate ODBC source  This should be fairly stable    The downside is that you can t change file location or name easily within pgsql like in the previous approach   A friendly reminder  The permission issue applies to this fdw extensions  since its loaded into pgsql service  pgsql must have access privileged to the excel files

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You can also use psql console to execute  copy without need to send file to Postgresql server machine  The command is the same    copy mytable     column list     FROM   path to csv file  WITH CSV HEADER

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For python you could use openpyxl for all 2010 and newer file formats  xlsx    Al Sweigart has a full tutorial from automate the boring parts on working with excel spreadsheets its very indepth and the whole book and accompanying Udemy course are great resources   From his example   gt  gt  gt  import openpyxl  gt  gt  gt  wb   openpyxl load workbook  example xlsx    gt  gt  gt  wb get sheet names     Sheet1    Sheet2    Sheet3    gt  gt  gt  sheet   wb get sheet by name  Sheet3    gt  gt  gt  sheet  lt Worksheet  Sheet3  gt    Understandably once you have this access you can now use psycopg to parse the data to postgres as you normally would do   This is a link to a list of python resources at python-excel also xlwings provides a large array of features for using python in place of vba in excel

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A method that I use is to load the table into R as a data frame  then use dbWriteTable to push it to PostgreSQL  These two steps are shown below   Load Excel data into R  R s data frame objects are database-like  where named columns have explicit types  such as text or numbers  There are several ways to get a spreadsheet into R  such as XLConnect  However  a really simple method is to select the range of the Excel table  including the header   copy it  i e  CTRL C   then in R use this command to get it from the clipboard   d  lt - read table  clipboard   header TRUE  sep   t   quote       na strings     as is TRUE    If you have RStudio  you can easily view the d object to make sure it is as expected   Push it to PostgreSQL  Ensure you have RPostgreSQL installed from CRAN  then make a connection and send the data frame to the database   library RPostgreSQL  conn  lt - dbConnect PostgreSQL    dbname  mydb    dbWriteTable conn   some table name   d    Now some table name should appear in the database   Some common clean-up steps can be done from pgAdmin or psql   ALTER TABLE some table name RENAME  row names  TO id  ALTER TABLE some table name ALTER COLUMN id TYPE integer USING id  integer  ALTER TABLE some table name ADD PRIMARY KEY  id

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I have used Excel PowerPivot to create the postgreSQL insert statement  Seems like overkill  except when you need to do it over and over again  Once the data is in the PowerPivot window  I add successive columns with concatenate statements to  build  the insert statement   I create a flattened pivot table with that last and final column   Copy and paste the resulting insert statement into my EXISTING postgreSQL table with pgAdmin   Example two column table   my table has 30 columns from which I import successive contents over and over with the same Excel PowerPivot    Column1  a b        Column2  1 2       In PowerPivot I add calculated columns with the following commands   Calculated Column 1 has  insert into table name values      Calculated Column 2 has CONCATENATE  Calculated Column 1  CONCATENATE  Column1              until you get to the last column and you need to terminate the insert statement   Calculated Column 3 has CONCATENATE  Calculated Column 2  CONCATENATE  Column2         Then in PowerPivot I add a flattened pivot table and have all of the insert statement that I just copy and paste to pgAgent   Resulting insert statements   insert into table name values   a   1     insert into table name values   b   2     insert into table name values   c   3      NOTE   If you are familiar with the power pivot CONCATENATE statement  you know that it can only handle 2 arguments  nuts    Would be nice if it allowed more

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You can do that easily by DataGrip      First save your excel file as csv formate   Open the excel file then SaveAs as csv format Go to datagrip then create the table structure according to the csv file   Suggested create the column name as the column name as Excel column right click on the table name from the list of table name of your database then click of the import data from file   Then select the converted csv file

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