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Dense vs. sparse data format

Description

The example 'indexeg' shows how to read data tables with different formats from a spreadsheet:

  • a dense 3x2 table
  • a dense 2x3 table
  • a sparse 2x3 table

A spreadsheet may be accessed from Mosel through an ODBC connection (using the odbc driver, indexeg.mos, or with SQL statements, indexeg2.mos), with the software-specific driver excel (indexeg3.mos), or with the portable mmsheet module that can be used to read and write xls, xlsx (indexeg5.mos) and csv (indexeg6.mos) files.

The first two methods (odbc driver and SQL statements) apply to spreadsheets and databases. In addition, for Oracle databases we show how to use the software-specific connection provided by the module mmoci (indexeg4.mos).



Further explanation of this example: Xpress Whitepaper 'Using ODBC and other database interfaces with Mosel', Section Examples - Dense vs. sparse data format.


Source Files

Data Files
indexeg.csv[download]
indexeg.xls[download]
indexeg.xlsx[download]
indexeg.sqlite[download]





indexeg4.mos

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

   file indexeg4.mos
   `````````````````
   Reading dense and sparse format data tables
   from an Oracle database.
   - Using 'initializations' and SQL statements -
       
   (c) 2008 Fair Isaac Corporation
       author: S. Heipcke, 2007, rev. Feb. 2014
*******************************************************!)

model OCIImpEx
 uses "mmoci"

 parameters                                 
  DB="myname/mypassword@dbname"     ! Login to Oracle database (not provided)
 end-parameters

 declarations
  A,A2: array(1..3, 1..2) of real
  B,B2: array(1..2, 1..3) of real
  C,C2: array(1..2, 1..3) of real
  D,D2: array(R:range, 1..3) of real
 end-declarations

! **** Using SQL statements ****

 setparam("OCIverbose",true)
 OCIlogon(DB)
 setparam("OCIdebug",true)

 ! Data must be dense - there are not enough columns to serve as index!
 OCIexecute("select * from Range3by2 ", A)
 writeln("\n ===A=== ")
 forall(i in 1..3) writeln("Row(",i,"): ", A(i,1), " ", A(i,2))
 
 setparam("OCIndxcol", false)      ! Dense data
 OCIexecute("select * from Range2by3 ", B)
 writeln("\n ===B=== ")
 forall(i in 1..2)
  writeln("Row(",i,"): ", B(i,1), " ", B(i,2), " ", B(i,3))
 
 setparam("OCIndxcol", true)       ! Indexed data
 OCIexecute("select * from Range2by3i ", C)
 writeln("\n ===C=== ")
 forall(i in 1..2)
  writeln("Row(",i,"): ", C(i,1), " ", C(i,2), " ", C(i,3))

 setparam("OCIndxcol", false)      ! Partially indexed data
 OCIexecute("select * from RectRange ", D)
 writeln("\n ===D=== ")
 forall(i in R)
  writeln("Row(",i,"): ", D(i,1), " ", D(i,2), " ", D(i,3))

 OCIlogoff

! **** Using 'initializations from' ****

 initializations from "mmoci.oci:"+DB
  A2 as 'Range3by2'
  B2 as 'noindex;Range2by3'
  C2 as 'Range2by3i'
  D2 as 'noindex;RectRange'
 end-initializations

 writeln("\n ===A2=== ")
 forall(i in 1..3) writeln("Row(",i,"): ", A2(i,1), " ", A2(i,2))
 writeln("\n ===B2=== ")
 forall(i in 1..2)
  writeln("Row(",i,"): ", B2(i,1), " ", B2(i,2), " ", B2(i,3))
 writeln("\n ===C2=== ")
 forall(i in 1..2)
  writeln("Row(",i,"): ", C2(i,1), " ", C2(i,2), " ", C2(i,3))
 writeln("\n ===D2=== ")
 forall(i in R)
  writeln("Row(",i,"): ", D2(i,1), " ", D2(i,2), " ", D2(i,3))
 
end-model


**************************************************


! Creation of data tables in an Oracle database:


 declarations
  tsucc: array ({false,true}) of string
 end-declarations

 tsucc(false):="failed"; tsucc(true):="succeeded"

 OCIexecute("create table Range3by2 (First float, Second float)")
 writeln(" - Create Range3by2 (",tsucc(getparam("OCIsuccess")),")")
 OCIexecute("insert into Range3by2 (First, Second) values (:1, :2)", [ 1.2, 2.2, 2.1, 2.2, 3.1, 4.4])
 writeln(" - Insert values in Range3by2 (",tsucc(getparam("OCIsuccess")),",",
        getparam("OCIrowcnt"),'/',getparam("OCIrowxfr")," rows)")

 OCIexecute("create table Range2by3 (First float, Second float, Third float)")
 writeln(" - Create Range2by3 (",tsucc(getparam("OCIsuccess")),")")
 OCIexecute("insert into Range2by3 (First, Second, Third) values (:1, :2, :3)", [ 1.2, 1.2, 1.3, 2.1, 2.2, 2.3])
 writeln(" - Insert values in Range2by3 (",tsucc(getparam("OCIsuccess")),",",
        getparam("OCIrowcnt"),'/',getparam("OCIrowxfr")," rows)")

 OCIexecute("create table Range2by3i (Firsti integer, Secondi integer, Value float)")
 writeln(" - Create Range2by3i (",tsucc(getparam("OCIsuccess")),")")
 OCIexecute("insert into Range2by3i (Firsti, Secondi, Value) values (:1, :2, :3)", [ 1, 1, 1.1, 1, 2, 1.2, 1, 3, 1.3, 2, 1, 2.1, 2, 2, 2.2, 2, 3, 2.3])
 writeln(" - Insert values in Range2by3i (",tsucc(getparam("OCIsuccess")),",",
        getparam("OCIrowcnt"),'/',getparam("OCIrowxfr")," rows)")

 OCIexecute("create table RectRange (Firsti integer, Second_1 float, Second_2 float, Second_3 float)")
 writeln(" - Create RectRange (",tsucc(getparam("OCIsuccess")),")")
 OCIexecute("insert into RectRange (Firsti, Second_1, Second_2,Second_3) values (:1, :2, :3, :4)", [ 1, 1.1, 1.2, 1.3, 2, 2.1, 2.2, 2.3])
 writeln(" - Insert values in RectRange (",tsucc(getparam("OCIsuccess")),",",
        getparam("OCIrowcnt"),'/',getparam("OCIrowxfr")," rows)")


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