PHP using txt text file to do database program _php tutorial

Define ("Tblpath", ".");
Define ("Exten", ". php");
Define ("Filehead", " This file is only for Class txttbl ");
Class Txttbl {
var $innerName = ""; Database name
var $innerCount; Number of database records
var $innerFields; database Field List Array
var $inner _f_count; Number of database fields
var $fullName; The full file name
var $isModify = false; Whether the current record has been modified
var $fileModify = false; Whether the database has been modified
var $innerRecorders; Database record Array
var $curLine; Current record number
var $curArray; Current row Array
var $stringDel; Save deleted records
var $sprt 1; Delimiter between database records
var $sprt 2; Delimiter between database fields
var $innerBof = true;
var $innerEof = false;

function Create ($tblName, $fields, $sprt 1= "<---txttbl--->n", $sprt 2= "<---txttbl--->") {
if (empty ($tblName)) {
echo "The Textdatebase file name is not appoint.";
return false;
}
$fullName = Tblpath. $tblName. Exten;
if (file_exists ($fullName)) {
echo "The Textdatebase file is already exist.";
return false;
}
if (empty ($fields)) {
echo "The fields list Array is invalid.";
return false;
}
$cont = Implode ($sprt 2, $fields);
$cont = Filehead. " n ". $cont;
$fp = fopen ($fullName, "w");
Fwrite ($fp, $cont);
Fclose ($FP);
return true;
}

function Drop ($tblName, $sprt 1= "<---txttbl--->n", $sprt 2= "<---txttbl--->") {
if (empty ($tblName)) {
echo "The Textdatebase file name is not Proveid.";
return false;
}
if (!empty ($this->innername)) {
echo "Current file not closed,please close it and try again.";
return false;
}
$fullName = Tblpath. $tblName. Exten;
if (!file_exists ($fullName)) {
echo "The Textdatebase file not exist.";
return false;
}
$fp = fopen ($fullName, "R");
if (!feof ($fp)) {
$readFromFile = fgets ($FP);
}
if ($readFromFile!=filehead. " N ") {
Fclose ($FP);
echo "Not a valid textdatabase file. (The head is invalid.) "." n ";
return false;
}
$readFromFile = "";
if (!feof ($fp)) $readFromFile. = Fgets ($FP);
Fclose ($FP);
$readFromFile = Trim ($readFromFile);
if (empty ($readFromFile)) {
echo "Not a valid textdatabase file. (Can ' t find fields define.) ";
return false;
}
$cont = Filehead. " n ". $readFromFile;
$fp = fopen ($fullName, "w");
Fwrite ($fp, $cont);
Fclose ($FP);
return true;
}


function open ($tblName, $sprt 1= "<---txttbl--->n", $sprt 2= "<---txttbl--->") {
if (empty ($tblName)) {
echo "The Textdatebase file name is not Proveid.";
return false;
}
if (!empty ($this->innername)) {
echo "Current file not closed,please close it and try again.";
return false;
}
$this->fullname = Tblpath. $tblName. Exten;
if (!file_exists ($this->fullname)) {
echo "The Textdatebase file not exist.";
return false;
}
$fp = fopen ($this->fullname, "R");
if (!feof ($fp)) {
$readFromFile = fgets ($FP);
}
if ($readFromFile!=filehead. " N ") {
Fclose ($FP);
echo "Not a valid textdatabase file. (The head is invalid.) "." n ";
return false;
}
$readFromFile = "";
while (!feof ($FP)) $readFromFile. = Fgets ($FP);
Fclose ($FP);
$readFromFile = Trim ($readFromFile);
if (empty ($readFromFile)) {
echo "Not a valid textdatabase file. (Can ' t find fields define.) ";
return false;
}
$this->innerrecorders = Explode ($sprt 1, $readFromFile);
$this->innercount = count ($this->innerrecorders)-1;
$this->innerfields = Explode ($sprt 2, $this->innerrecorders[0]);
$this->innerfieldscount = count ($this->innerfields);

$this->innername = $tblName;
$this->sprt1 = $sprt 1;
$this->sprt2 = $sprt 2;

if ($this->innercount==0) {
$this->curline = 0;
$this->innereof = true;
}else{
$this->curline = 1;
if ($this->innercount==1) $this->innereof = true;
if (! $this->initrec ()) return false;
}

return true;
}

Function Close () {
if (empty ($this->innername)) return true;
//save Modify
$isModify = false;
if ($th is->ismodify) {
$this->savemodify ();
$isModify = true;
}
if (isset ($this->stringdel)) {
$isModify = true;
$delNo = Explode (",", $this->stringdel);
foreach ( $delNo as $no) {
$no = (integer) $no;
unset ($this->innerrecorders[$no]);
}
}
if ($isModify | | $this->filemodify) {
$recorders = implode ($this->sprt1, $this->innerrecorders);
$recorders = Filehead ." n ". $recorders;
$fp = fopen ($this->fullname, "w");
Fwrite ($fp, $recorders);
Fclose ($FP);
}
$this->innername= "";
unset ($this->innerrecorders);
unset ($this->curarray);
}

Function Next () {
if ((! $this->innereof) && (!empty ($this->innername)) {
if ($this, curline== $this->innercount) {
$this->innereof = true;
return true;
}
$this->savemodify ();
$this->curline++;
if ($this->innerbof) $this->innerbof = false;
$this->initrec ();
}
return false;
}

Function prev () {
if ((! $this->innerbof) && (!empty ($this->innername)) {
$this Savemodify ();
$this->curline--;
if ($this->curline = = 1)
$this->innerbof = true;
if ($this->innereof) $this->innereof = false;
$this->initrec ();
}
}

function First () {
if ($this->innerbof| | Empty ($this->innername))
return false;
$this->savemodify ();
$this->curline = 1;
$this->innerbof= true;
$this->innereof = false;
$this->initrec ();

}

Function End () {
if ($this->innereof| | Empty ($this->innername))
return false;
$this->savemodify ();
$this->curline = $this->innercount;
$this->innereof= true;
$this->innerbof = false;
$this->initrec ();

}

function eof () {
if (Empty ($this->innername)) {
return false;
}else return $this->innereof;
}

function BoF () {
if (Empty ($this->innername)) {
return true;
}else return $this->innerbof;
}

function RecNo () {
return $this->curline;
}

function RecCount () {
return $this->innercount;
}

function Fieldscount () {
if (Empty ($this->innername)) {
return false;
}else return $this->inner_f_count;
}

function GetValue ($field) {
if ($this->curline==0| | Empty ($this->innername)) {
echo "Can ' t read current record,maybe not in use or no record.";
return false;
}
$field = $this->chkfield ($field);
if ($field ==-1) {
return false;
}
return $this->curarray[$field];
}

function SetValue ($field, $value) {
if ($this->curline==0| | Empty ($this->innername)) {
echo "Can ' t read current record,maybe not in use or no record.";
return false;
}
$field = $this->chkfield ($field);
if ($field ==-1) {
return false;
}
$this->curarray[$field]= $value;
$this->modify= true;
}

function display ($shownon =0, $sprt 1= "", $sprt 2= "", $sprt 3= "", $sprt 4 = "") {
echo $SPRT 3;
foreach ($this->curarray as $v) {
if ($shownon ==1&&empty ($v)) $v = "Novalue";
echo $sprt 1. $v. $SPRT 2;
}
Echo $SPRT 4;
}

function location ($field, $keyValue) {
$field = $this->chkfield ($field);
if ($field ==-1) return false;
for ($i = $this->curline; $i <= $this->innercount; $i + +) {
if ($this->curarray[$field]== $keyValue) {
return true;
}
$this->next ();
}
return false;
}

Function del ($recNo =-1) {
if ($this->curline==0) return false;
$vartype = GetType ($recNo);
if ($vartype! = "integer") {
echo "del error:check ur para type.";
return false;
}
if ($recNo ==-1) {
$recNo = $this->curline;}
ElseIf ($recNo > $this->innercount| | $recNo <1) {
echo "Del error:out over the rang.";
return false;
}
if (! $this->chkdel ($recNo)) {
if (Isset ($this->stringdel)) {
$this->stringdel.= (', '. $recNo);
}else $this->stringdel = (string) $recNo;
}else return false;
}

function append ($fields = "") {
$this->savemodify ();
for ($i =1; $i <= $this->innerfieldscount; $i + +)
$newRec [] = "";
if (!empty ($fields)) {
foreach ($fields as $k = = $v) {
$k = $this->chkfield ($k);
if ($k ==-1) {
return false;
}
$newRec [$k]= $v;
}
}
$this->innercount++;
$this->curline = $this->innercount;
$this->innerbof = false;
$this->innereof = true;
unset ($this->curarray);
$this->curarray = & $newRec;
$this->ismodify = true;
}

Save changes
function Savemodify () {
if ($this->ismodify) {
$this->innerrecorders[$this->curline]= implode ($this->sprt2, $this->curarray);
$this->ismodify = false;
$this->filemodify= true;
}
}

Initializes the current array of records when the pointer changes
function Initrec () {
$this->curarray = explode ($this->sprt2, $this->innerrecorders[$this->curline]);
if (count ($this->curarray)! = $this->innerfieldscount) {
echo "The current Recorder fields count unequal to Table ' S.N File would close.";
$this->close ();
return false;
}
return true;
}

Output current record information, designed to be adjusted for trial
function Ddisplay () {
if ($this->innercount==0) return false;
The echo $v of the foreach ($this->innerfields as $v). ----";
echo "
";
The echo $v of the foreach ($this->curarray as $v). ---";
}

Check if the record has been deleted
function Chkdel ($key) {
if (Empty ($key) && $key!=0) {
echo "The key not appoint.";
return false;
}
if (!isset ($this->stringdel)) {
return false;
}
if (Ereg (^|,). $key. " (, |$) ", $this->stringdel)) {
return true;
}
return false;
}

Check that the submitted field names are valid.
function Chkfield ($field) {
if (Empty ($field) && ($field!=0)) {
echo "the field not appoint.";
return-1;
}
$vartype = GetType ($field);
Switch ($vartype) {
Case "integer":
if ($field >= $this->innerfieldscount) {
echo "The field is large than Fieldscount";
return-1;
}elseif ($field <0) {
echo "The field is less than 0";
return-1;
}
return $field;
Case "string":
foreach ($this->innerfields as $k = + $v) if ($field = = $v) return $k;
echo "The field name is not found.";
return-1;
Default
echo "The field is invalid.";
return-1;
}
}

}

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