Manual

From NEOSYS Dev Wiki

1 Programmer's Guides

Only for C++ at the moment. For all others, see some examples: http://code.google.com/p/exodusdb/source/browse/#svn%2Ftrunk%2Fswig%2Fshare

1.1 Python

1.2 Perl

1.3 PHP

1.4 Java

1.5 C#

1.6 C++

2 ICONV/OCONV PATTERNS

2.1 Decimal (MD/MC)

input conversion (string) output
1234 MD2 12.34
1234 MD20 1234.00
1234 MD20, 1,234.00
1234.5678 MD2 12.35
1234.5678 MD20 1234.57
1234.5678 MD20, 1,234.57
1234 MC2 12,34
1234 MC20 1234,00
1234 MC20, 1.234,00
1234 MD20- 1234.00

2.2 Date (D)

input conversion (string) output
12345 D 18 OCT 2001
12345 D/ 10/18/2001
12345 D- 10-18-2001
12345 D2 18 OCT 01
12345 D/E 18/10/2001
12345 DS 2001 OCT 18
12345 DS/ 2001/10/18
12345 DM 10
12345 DMA OCTOBER
12345 DY 2001
12345 DY2 01
12345 DD 18
12345 DW 4
12345 DWA THURSDAY
12345 DQ 4
12345 DJ 291
12345 DL 31

2.3 Time (MT)

input conversion (string) output
234800 MT 17:13
234800 MTH 05:13PM
234800 MTS 17:13:20
234800 MTHS 05:13:20PM
0 MT 00:00
0 MTH 12:00AM
0 MTS 00:00:00
0 MTHS 12:00:00AM

2.4 Hex (HEX/MX)

input conversion (string) output
ab HEX (same as HEX8 or HEX4 depending on platform)
ab HEX8 0000006100000062
ab HEX4 00610062
ab HEX2 6162
15 MX F
254 MX FE
255 MX FF
256 MX 100
27354234 MX 1A1647A

2.5 Text (L/R/T)

input conversion (string)output
abcd L#3 abc
ab L#3 ab␣
abcd R#3 bcd
ab R#3 ␣ab
ab T#3 ab␣
abcd T#3 abc™d␣␣
42 L(0)#5 42000
42 R(0)#5 00042
42 T(0)#5 42000

3 Dictionaries

Exodus dictionaries enable classic multivalue database data definition. Dictionaries are just normal Exodus multivalue files that contain one record for each data column definition. You can use Exodus's edir program to manually edit dictionaries.

Dictionary file names must start with the word "dict_". For example, if you have a "books" file, then you will probably have a "dict_books" file.

You can list the contents of a dictionary by typing "list dict_filename".

3.1 Exodus Dictionary Format

0 DICTID Field/Column Code
1 DICTTYPE "F" or "S" : "F" means use Field No (i.e. raw data) and "S" means use Source Code (i.e. a function).
2 FIELDNO Field number (0=key, 1=field 1 etc for "Fields"
3 TITLE Title on reports
4 SM S or M or Mnn : "Single Value" or "Multivalue" or "Multivalue Group nn"
5 KEYPARTNO Multipart keys are separated by * characters.
6
7 CONVERSION Conversion (MD/MT/D etc.)
8 SOURCE Source Code of a subroutine to calculate the field. Multivalues are lines and the result must be placed in a variable "ANS".
9 JUST "L" or "R" or "T" requesting left, right or text justification
10 WIDTH Column Width on fixed width reports

3.2 Sort/Select Command

Exodus provides the classic multivalue sort/select command within any Exodus program followed by readnext().

Classic multivalue select/readnext functions only provide the keys of the selected records. Exodus provides the classic select/readnext and also selectrecords/readnextrecord which provides complete records instead of just keys.

The format of the select/sselect command is as follows:

 SELECT|SSELECT

 {max_number_of_records}

 {using filename}

 filename

 {datakeyvalue} ...

 {BY|BY-DSND fieldname} ...
 
 {

  WITH

  {NO|ALL|ANY}

  dict_field_id

  {
   CONTAINING|STARTING|ENDING|LIKE|EQ|NE|NOT|GT|LT|GE|LE=|<>|>|<|>=|<= value(s)
   |
   BETWEEN value AND value
  }

  {AND|OR}

 } ...

4 Traditional Multivalue Functions and Statements (non-OO)

Exodus clones traditional multivalue function and statement behaviour and retains their syntax as far as possible.

  • Traditional functions are rendered as Exodus functions.
  • Traditional statements are rendered as Exodus subroutines.
PRINT OCONV(DATE(),'D')

in Exodus becomes:

printl(oconv(date(),"D"));

4.1 String Commands

The use of most of Exodus's functions will be fairly obvious to traditional multivalue programmers.

Ηοwever it is not so obvious that all the functions ending in "-er" correspond to the old string commands.

For example, the classic multivalue "modify in-place" character conversion command:

CONVERT 'ab' TO 'cd' IN ZZ

is now represented in Exodus by:

converter(zz,"ab","cd");

Exodus provides a complete set of string modification commands even where there was no specific command in classic mv basic.

To guarantee fast performance (regardless of compiler optimisation) you should always use the command instead of the old "self assign" idiom.

For example:

ZZ=TRIM(ZZ)

should appear in Exodus as:

trimmer(zz);

and not:

zz=trim(zz);

4.2 Function Types

TYPE FUNCTION TYPE
var= traditional functions that return values and can be used in expressions and be on the right hand side of assignments
if traditional conditional statements that started with "if" or ended with "then/else" (or could have)
cmd traditional commands with no outputs
cmd2 traditional commands that now have outputs and can be used in expressions

4.3 Parameters/Argument Types

in Parameters that provide data to the function. Can be variables or raw data like 1 or "X"
unspecified Same as "in". Omission of the most common type de-clutters the documentation. NB When defining your own subroutines and functions "in" cannot be omitted from the source code.
io Parameters that may provide and/or return data. Must be variables. Cannot be raw data like 1 or "X"
out Parameters that return data. Must be variables. Cannot be raw data like 1 or "X"

Optional Parameters

Key Default
="" ""
=" " " "
="." "."
=1 1
=0 0
=true true
=false false

4.4 Complete List of Functions

4.4.1 Environment
var= osgetenv(envname)
if osgetenv(envname, out value)
if ossetenv(envname, newvalue)
4.4.2 Time/Date/Sleep
var= date()
var= time()
var= timedate()
cmd ossleep(milliseconds)
var= ostime()
4.4.3 System File
if osopen(filename, out filehandle, in locale="")
cmd osclose(filehandle)
var= osbread(filehandle, startoffset, length)
cmd osbread(out data, filehandle, startoffset, length)
cmd osbwrite(data, filehandle, startoffset)
if osread(out data, osfilename, in locale="")
var= osread(osfilename, in locale="")
if oswrite(data, osfilename, in locale="")
if osdelete(osfilename)
if osrename(oldosdir_or_filename, newosdir_or_filename)
if oscopy(fromosdir_or_filename, newosdir_or_filename)
cmd osflush()
4.4.4 System Directory
var= oslist(path=".", wildcard="", mode=0)
var= oslistf(path=".", wildcard="")
var= oslistd(path=".", wildcard="")
var= osfile(filename)
var= osdir(filename)
if osmkdir(newdirname)
if osrmdir(dirname, evenifnotempty=false)
var= oscwd()
var= oscwd(newdirname)
4.4.5 Program Control
var= suspend(command)
var= osshell(command)
var= osshellread(command)
cmd osshellread(out commandoutput, command)
cmd osshellwrite(commandinput, command)
cmd stop(text="")
cmd abort(text)
var= perform(command)
var= execute(command)
var= chain(command)
var= logoff()
cmd debug()


4.4.6 Variable Control
if assigned(anyvar)
if unassigned(anyvar)
cmd2 exchange(var1,var2)
cmd2 transfer(fromvar,tovar)
4.4.7 Console Output
cmd print(instring)
cmd printl(instring="")
cmd printt(instring="")
4.4.8 Cursor
var= at(column0orcode)
var= at(column0, row0)
var= getcursor()
cmd setcursor(cursorstr)
var= getprompt()
cmd setprompt(promptchar)
4.4.9 Console Input
var= input()
var= input(out inputstr)
var= input(prompt, out inputstr)
var= inputn(n)
4.4.10 Math
var= rnd(number)
cmd initrnd(seednumber)
var= mod(dividend, divisor)
var= abs(number)
var= pwr(base, exponent)
var= exp(power)
var= sqrt(number)
var= sin(degrees)
var= cos(degrees)
var= tan(degrees)
var= atan(number)
var= loge(number)
var= integer(number)
var= floor(number)
var= round(number, ndecimals=0)
4.4.11 String Creation
var= chr(integer)
var= str(instring, number)
var= space(number)


4.4.12 String Info/Search
var= count(instring, substr)
var= dcount(instring, substr)
var= index(instring, substr, occurrenceno=1)
var= index2(instring, substr, startcharno=1)
var= len(instring)
var= length(instring)
if match(instring, matchstr, options="")
var= seq(inchar)
4.4.13 String Functions

Return new and doesnt change original.

var= convert(instring, oldchars, newchars)
var= crop(instring)
var= field(instring, sepchar, fieldno, nfields=1)
var= field2(instring, sepchar, fieldno, nfields=1)
var= fieldstore(instring, sepchar, fieldno, nfields, replacementstr)
var= lcase(instring)
var= ucase(instring)
var= lower(instring)
var= raise(instring)
cmd2 quote(instring)
cmd2 squote(instring)
cmd2 unquote(instring)
var= splice(instring, fromcharno, nchars, insertionstr)
var= substr(instring, fromcharno)
var= substr(instring, fromcharno, nchars)
var= swap(instring, oldstr, newstr, options="")
var= trim(instring, trimchars=" ")
var= trimb(instring, trimchars=" ")
var= trimf(instring, trimchars=" ")
4.4.14 String Commands

Modify original in place

cmd2 converter(io instring, oldchars, newchars)
var= cropper(io instring)
cmd2 fieldstorer(io instring, sepchar, fieldno, nfields, replacementstr)
cmd2 lcaser(io instring)
var= ucaser(io instring)
cmd2 lowerer(io instring)
cmd2 raiser(io instring)
cmd2 quoter(io instring)
cmd2 squoter(io instring)
cmd2 unquoter(io instring)
cmd2 splicer(io instring, fromcharno, nchars, insertion)
var= substrer(io instring, fromcharno)
var= substrer(io instring, fromcharno, nchars)
cmd2 swapper(io instring, oldstr, newstr, options="")
cmd2 trimmer(io instring, trimchars=" ")
cmd2 trimmerb(io instring, trimchars=" ")
cmd2 trimmerf(io instring, trimchars=" ")
4.4.15 iconv/oconv
var= oconv(instring, conversionstring)
var= iconv(instring, conversionstring)
4.4.16 Database
if connect(connectionstring="")
if disconnect()
if createdb(dbname, out errmsg)
if deletedb(dbname, out errmsg)
if createfile(filename, options="")
if deletefile(filename)
if clearfile(filename)
var= listfiles()
if createindex(filename, fieldname, usingdictfilename="")
if deleteindex(filename, fieldname)
var= listindexes(filename="")
if begintrans()
if rollbacktrans()
if committrans()
4.4.17 Database Files and Records
if open(filename, out filehandle)
if read(out record, filehandle, key)
if matread(out dimrecord, filehandle, key)
if readv(out record, filehandle, key, fieldnumber)
if write(record, filehandle, key)
if matwrite(in dimrecord, filehandle, key)
if writev(record, filehandle, key, fieldn)
if deleterecord(filehandle, key)
if updaterecord(record, filehandle, key) the record key must already exist
if insertrecord(record, filehandle, key) the record key must not already exist
if lock(filehandle, key)
cmd unlock(filehandle, key)
cmd unlockall()
4.4.18 Record Selection
if select(sortselectclause="")
cmd clearselect()
if readnext(out key)
if readnext(out key, out valueno) valueno returns multivalue numbers if your sortselectclause sorted BY-EXP on a multivalued field. Not implemented yet.
if selectrecord(sortselectclause="")
if readnextrecord(out record, out id) must be preceded by a selectrecord() not select()
4.4.19 Dictionary
var= calculate(fieldname)
var= xlate(filename, key, fieldno, mode)


4.4.20 Dynamic Array Functions

Return modified, dont change original

var= replace(instring, fieldno, replacement)
var= replace(instring, fieldno, valueno, replacement)
var= replace(instring, fieldno, valueno, subvalueno, replacement)
var= extract(instring, fieldno, valueno=0, subvalueno=0)
var= erase(instring, fieldno, valueno=0, subvalueno=0)
var= insert(instring, fieldno, insertion)
var= insert(instring, fieldno, valueno, insertion)
var= insert(instring, fieldno, valueno, subvalueno, insertion)
if locate(instring, target, out setting, fieldn=0, valuen=0)
if locateby(instring, target, ordercode, out setting, fieldn=0, valuen=0)
if locateusing(instring, target, usingchar, out setting, fieldn=0, valuen=0, subvaluen=0)
if locateusing(instring, target, usingchar)
var= remove(fromstr, io startx, out delimiterno)
var= sum(instring, sepchar=VM_)
4.4.21 Dynamic Array Commands

Modify original in place

cmd2 replacer(io instring, fieldno, replacement)
cmd2 replacer(io instring, fieldno, valueno, replacement)
cmd2 replacer(io instring, fieldno, valueno, subvalueno, replacement)
cmd2 inserter(io instring, fieldno, insertion)
cmd2 inserter(io instring, fieldno, valueno, insertion)
cmd2 inserter(io instring, fieldno, valueno, subvalueno, insertion)
cmd2 eraser(io instring, fieldno, valueno=0, subvalueno=0)