?
Solved

array from db table

Posted on 2000-03-29
5
Medium Priority
?
137 Views
Last Modified: 2010-04-04
Can someone please give me a code example of getting data from a table and putting it into a two dimensional array.

Thank You.
0
Comment
Question by:fiinfo
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 3
5 Comments
 
LVL 9

Accepted Solution

by:
ITugay earned 150 total points
ID: 2668193
Sample bellow is applicable in case your know maximum fields and records of a table. In other case use dynamic arrays instead static.
-------
const MaxRecNo = 100;
        MaxFldNo=20;

var A : array[0..MaxRecNo-1,0..MaxFldNo-1] of variant;

procedure ....
var I,N : integer;
begin
    Table1.Open;
    N:=0;
    while not Table1.EOF do
    begin
       for I:=0 to Table1.Fields.Count-1 do A[N,I]:=Fable1.Fields[I].AsVariant;
       inc(N);
       Table1.Next;
    end;
   Table1.Close;
end;
--------

Cheers,
Igor.
0
 
LVL 12

Expert Comment

by:rwilson032697
ID: 2668213
Lets assume we have a table with fields "X", "Y",and "Value", integer, integer and double respectively, then you could do this;

var
  TheArray = Array[1..MaxX, 1..MaxY] of Double;

Table.First;
while not Table.eof do
  begin
    TheArray[Table.FieldByName('X').AsInteger,
             Table.FieldByName('Y').AsInteger] := Table.FieldByName('Value').AsFloat; // or AsDouble...
    Table.Next;
  end;

Cheers,

Raymond.


0
 

Author Comment

by:fiinfo
ID: 2671274
I'm sorry, I don't understand your example (my fault not yours I'm sure).
My solution:

procedure....
var
  myArray : array of array of variant;
  F, R, n, i: Integer;
begin
  table1.open;
  table1.first;
  R := table1.recordcount;
  F := table1.fieldcount;
  setLength(myArray, R, F);
  while not Table1.EOF do
    begin
        for n := 0 to Table1.RecordCount-1 do
        begin
            for i:= 0 to Table1.FieldCount-1 do
            begin
                myArray[n, i]:= Table1.fields[i].AsVariant;
                listbox1.items.add(myArray[n,i]);//just to look at the result
            end;
            table1.next;
        end;
    end;
table1.close;
end;

If you can see a problem with this solution, I'd appreciate your input.
Thank YOu.

0
 
LVL 9

Expert Comment

by:ITugay
ID: 2672486
Rob has shown you the way how to store and retrieve two-dimension array of float values into/from table.

Now about YOUR solution. It's look like my sample but only with dynamic array. And it's seems like you have it. You looking for what? For bugs? For another way?

Igor.
0
 
LVL 9

Expert Comment

by:ITugay
ID: 2672488
Not Rob, sorry Raymond.
0

Featured Post

VIDEO: THE CONCERTO CLOUD FOR HEALTHCARE

Modern healthcare requires a modern cloud. View this brief video to understand how the Concerto Cloud for Healthcare can help your organization.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Introduction The parallel port is a very commonly known port, it was widely used to connect a printer to the PC, if you look at the back of your computer, for those who don't have newer computers, there will be a port with 25 pins and a small print…
In this tutorial I will show you how to use the Windows Speech API in Delphi. I will only cover basic functions such as text to speech and controlling the speed of the speech. SAPI Installation First you need to install the SAPI type library, th…
This is my first video review of Microsoft Bookings, I will be doing a part two with a bit more information, but wanted to get this out to you folks.
In this video, Percona Solution Engineer Rick Golba discuss how (and why) you implement high availability in a database environment. To discuss how Percona Consulting can help with your design and architecture needs for your database and infrastr…
Suggested Courses
Course of the Month10 days, 16 hours left to enroll

770 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question