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Reading and writing records and lists

Description
This set of examples shows how to work with advanced data structures when accessing data in spreadsheets and databases:
  • reading in records (recordin*.mos)
  • writing out records (recordout*.mos)
  • reading and writing lists (listinout*.mos)
The basic model version uses an ODBC connection to spreadsheets or databases through the odbc driver, model version (2) uses ODBC through SQL statements, and model version (3) uses the software-specific driver excel to access Excel spreadsheets. Model version (1) shows how to work with Mosel's text data file format.

Further explanation of this example: Xpress Whitepaper 'Using ODBC and other database interfaces with Mosel', Section Examples - Working with lists - Working with records.

listrecord.zip[download all files]

Source Files

Data Files
recorddata.dat[download]
recorddata.csv[download]
recorddata2.csv[download]
recorddata.mdb[download]
recorddata.xls[download]
recorddata2.xls[download]
recordout_templ.xls[download]
recorddata.xlsx[download]
recorddata2.xlsx[download]
recorddata.sqlite[download]
listdata.dat[download]
listdata.csv[download]
listdata.mdb[download]
listdata.xls[download]
listdata.xlsx[download]
listdata.sqlite[download]





recordout2.mos

(!******************************************************
   Mosel Example Problems
   ====================== 

   file recordout2.mos
   ```````````````````
   Writing out records to
   spreadsheets or databases via ODBC.
   - Using SQL commands -
   
   (c) 2008 Fair Isaac Corporation
       author: S. Heipcke, Nov. 2007, rev. Aug. 2023
*******************************************************!)

model "Record output (SQL)"
 uses "mmodbc"
 options keepassert

 parameters
                              ! Use Excel spreadsheet `recorddata.xls'
!  CNCT = 'DSN=Excel Files;DBQ=C:/xpress/examples/mosel/WhitePapers/MoselData/recorddata.xls'
!  CNCT = 'recorddata.xls'
                              ! Use Access database `recorddata.mdb'
!  CNCT = 'DSN=MS Access Database;DBQ=C:/xpress/examples/mosel/WhitePapers/MoselData/recorddata.mdb'
  CNCT = 'recorddata.mdb'
                              ! Use mysql database `recorddata' (not provided)
!  CNCT = 'DSN=mysql;DB=recorddata'
                              ! Use SQLite database `recorddata' via ODBC
!  CNCT = 'DSN=sqlite;DATABASE=recorddata.sqlite'
                              ! Use SQLite database `recorddata' directly
!  CNCT = 'recorddata.sqlite'
 end-parameters

 public declarations
  PRODUCTS: set of string
  MACH: range
  ProdRec = public record
   Cost: real
   Duration: integer
  end-record 
  PDATA: dynamic array(PRODUCTS,MACH) of ProdRec

  R = 1..9
  AllDataRec = public record
   Product: string
   Mach: integer
   Cost: real
   Duration: integer
  end-record 
  ALLDATA: array(R) of AllDataRec
 end-declarations

! **** Reading data from a text file
 initializations from "recorddata.dat"
  PDATA as "ProdData"
  ALLDATA as "AllData"
 end-initializations

! **** Write out complete records

 setparam("SQLverbose",true)
 setparam("SQLdebug",true)

 SQLconnect(CNCT)
 assert(getparam("SQLsuccess"))
 SQLexecute("delete from ProdDataOutH") ! Cleaning up previous results: works
                                        ! only for databases, cannot be used
                                        ! with spreadsheets (instead, delete
                                        ! previous solutions directly in the
                                        ! spreadsheet file)
 SQLexecute("insert into ProdDataOutH(IndexP,IndexM,Cost,Duration) values (?,?,?,?)",
  PDATA)
 assert(getparam("SQLsuccess"))
 SQLexecute("delete from AllDataOutH")  ! Cleaning up previous results
 setparam("SQLndxcol", false)           ! Dense data
 SQLexecute("insert into AllDataOutH(IndexP,IndexM,Cost,Duration) values (?,?,?,?)",
  ALLDATA)
 assert(getparam("SQLsuccess"))

 SQLdisconnect

end-model

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