oracle资料库函式库

  2009-07-31/22:56

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• oracle资料库函式库
• 学习oracle资料库函式库
• PH

<?
class DB_Sql {
var $Debug = false;
var $Home = "/u01/app/oracle/product/8.0.4";
var $Remote = 1;
/* This Query will be sent directly after the first connection
Example:
var $ConnectQuery="ALTER SESSION SET nls_date_language=german nls_date_format='DD.MM.RRRR'";
-> Set the date format for this session, this is fine when your ora-role
cannot be altered */
var $ConnectQuery='';
/* Due to a strange error with Oracle 8.0.5, Apache and PHP3.0.6
you don't need to set the ENV - on my system Apache
will change to a zombie, if I don't set this to FALSE!
Instead I set these ENV-vars before the startup of apache.
If unsure try it out, if it works. */
var $OraPutEnv = true;

var $Database = "";
var $User = "";
var $Password = "";

var $Link_ID = 0;
var $Query_ID = 0;
var $Record = array();
var $Row;

var $Errno = 0;
var $Error = "";
var $ora_no_next_fetch=false;


/* copied from db_mysql for completeness */
/* public: identification constant. never change this. */
var $type = "oracle";
var $revision = "Revision: 1.3";
var $Halt_On_Error = "yes"; ## "yes" (halt with message), "no" (ignore errors quietly), "report" (ignore errror, but spit a warning)

/* public: constructor */
function DB_Sql($query = "") {
$this->query($query);
}

/* public: some trivial reporting */
function link_id() {
return $this->Link_ID;
}

function query_id() {
return $this->Query_ID;
}

function connect() {
## see above why we do this
if ($this->OraPutEnv) {
PutEnv("ORACLE_SID=$this->Database");
PutEnv("ORACLE_HOME=$this->Home");
}
if ( 0 == $this->Link_ID ) {
if($this->Debug) {
printf("<br>Connect()ing to $this->Database...<br>n");
}
if($this->Remote) {
if($this->Debug) {
printf("<br>connect() $this->User/******@$this->Database<br>n");
}  
$this->Link_ID=ora_plogon
("$this->User/$this->Password@$this->Database","");
/************** (comment by SSilk)
this dosn't work on my system:
$this->Link_ID=ora_plogon
("$this->User@$this->Database.world","$this->Password");
***************/
} else {
if($this->Debug) {
printf("<br>connect() $this->User, $this->Password <br>n");
}  
$this->Link_ID=ora_plogon("$this->User","$this->Password");
/* (comment by SSilk: don't know how this could work, but I leave this untouched!) */
}
if($this->Debug) {
printf("<br>connect() Link_ID: $this->Link_ID<br>n");
}
if (!$this->Link_ID) {
$this->halt("connect() Link-ID == false " .
"($this->Link_ID), ora_plogon failed");
} else {
//echo "commit on<p>";
ora_commiton($this->Link_ID);
}
if($this->Debug) {
printf("<br>connect() Obtained the Link_ID: $this->Link_ID<br>n");
}
## Execute Connect Query
if ($this->ConnectQuery) {
$this->query($this->ConnectQuery);
}
}
}

## In order to increase the # of cursors per system/user go edit the
## init.ora file and increase the max_open_cursors parameter. Yours is on
## the default value, 100 per user.
## We tried to change the behaviour of query() in a way, that it tries
## to safe cursors, but on the other side be carefull with this, that you
## don't use an old result.
##  
## You can also make extensive use of ->disconnect()!
## The unused QueryIDs will be recycled sometimes.  

function query($Query_String)  
{

/* No empty query please. */
if (empty($Query_String))
{
return 0;
}

$this->connect();
$this->lastQuery=$Query_String;

if (!$this->Query_ID) {
$this->Query_ID= ora_open($this->Link_ID);
}
if($this->Debug) {
printf("Debug: query = %s<br>n", $Query_String);
printf("<br>Debug: Query_ID: %d<br>n", $this->Query_ID);
}

if(!@ora_parse($this->Query_ID,$Query_String)) {
$this->Errno=ora_errorcode($this->Query_ID);
$this->Error=ora_error($this->Query_ID);
$this->halt("<BR>ora_parse() failed:<BR>$Query_String<BR><small>Snap & paste this to sqlplus!</SMALL>");
} elseif (!@ora_exec($this->Query_ID)) {
$this->Errno=ora_errorcode($this->Query_ID);
$this->Error=ora_error($this->Query_ID);
$this->halt("<BR>n$Query_Stringn<BR><small>Snap & paste this to sqlplus!</SMALL>");
}

$this->Row=0;

if(!$this->Query_ID) {
$this->halt("Invalid SQL: ".$Query_String);
}

return $this->Query_ID;
}

function next_record() {
if (!$this->ora_no_next_fetch &&  
0 == ora_fetch($this->Query_ID)) {
if ($this->Debug) {
printf("<br>next_record(): ID: %d Row: %d<br>n",
$this->Query_ID,$this->Row+1);
// more info for $this->Row+1 is $this->num_rows(),
// but dosn't work in all cases (complicated selects)
// and it is very slow here
}
$this->Row +=1;

$errno=ora_errorcode($this->Query_ID);
if(1403 == $errno) { # 1043 means no more records found
$this->Errno=0;
$this->Error="";
$this->disconnect();
$stat=0;
} else {
$this->Error=ora_error($this->Query_ID);
$this->Errno=$errno;
if($this->Debug) {
printf("<br>%d Error: %s",
$this->Errno,
$this->Error);
}
$stat=0;
}
} else {
$this->ora_no_next_fetch=false;
for($ix=0;$ix<ora_numcols($this->Query_ID);$ix++) {
$col=strtolower(ora_columnname($this->Query_ID,$ix));
$value=ora_getcolumn($this->Query_ID,$ix);
$this->Record[ "$col" ] = $value;
$this->Record[ $ix ] = $value;
#DBG echo"<b>[$col]</b>: $value <br>n";
}
$stat=1;
}

return $stat;
}

## seek() works only for $pos - 1 and $pos
## Perhaps I make a own implementation, but my
## opinion is, that this should be done by PHP3
function seek($pos) {
if ($this->Row - 1 == $pos) {
$this->ora_no_next_fetch=true;
} elseif ($this->Row == $pos ) {
## do nothing
} else {
$this->halt("Invalid seek(): Position is cannot be handled by API.<BR>".
"Only a seek to the last element is allowed in this version<BR>".
"Difference too big. Wanted: $pos Current pos: $this->Row");
}
if ($this->Debug) echo "<BR>Debug: seek = $pos<BR>";
$this->Row=$pos;
}

function lock($table, $mode = "write") {
if ($mode == "write") {
$result = ora_do($this->Link_ID, "lock table $table in row exclusive mode");
} else {
$result = 1;
}
return $result;
}

function unlock() {
return ora_do($this->Link_ID, "commit");
}

// Important note: This function dosn't work with Oracle-Database-Links!
// You are free to get a better method. :)
function metadata($table,$full=false) {
$count = 0;
$id = 0;
$res = array();

/*
* Due to compatibility problems with Table we changed the behavior
* of metadata();
* depending on $full, metadata returns the following values:
*
* - full is false (default):
* $result[]:
* [0]["table"] table name
* [0]["name"] field name
* [0]["type"] field type
* [0]["len"] field length
* [0]["flags"] field flags ("NOT NULL", "INDEX")
* [0]["format"] precision and scale of number (eg. "10,2") or empty
* [0]["index"] name of index (if has one)
* [0]["chars"] number of chars (if any char-type)
*
* - full is true
* $result[]:
* ["num_fields"] number of metadata records
* [0]["table"] table name
* [0]["name"] field name
* [0]["type"] field type
* [0]["len"] field length
* [0]["flags"] field flags ("NOT NULL", "INDEX")
* [0]["format"] precision and scale of number (eg. "10,2") or empty
* [0]["index"] name of index (if has one)
* [0]["chars"] number of chars (if any char-type)
* [0]["php_type"] the correspondig PHP-type
* [0]["php_subtype"] the subtype of PHP-type
* ["meta"][field name] index of field named "field name"
* This could used, if you have the name, but no index-num - very fast
* Test: if (isset($result['meta']['myfield'])) {} ...
*/

$this->connect();

## This is a RIGHT OUTER JOIN: "(+)", if you want to see, what
## this query results try the following:
## $table = new Table; $db = new my_DB_Sql; # you have to make
## # your own class
## $table->show_results($db->query(see query vvvvvv))
##
$this->query("SELECT T.table_name,T.column_name,T.data_type,".
"T.data_length,T.data_precision,T.data_scale,T.nullable,".
"T.char_col_decl_length,I.index_name".
" FROM ALL_TAB_COLUMNS T,ALL_IND_COLUMNS I".
" WHERE T.column_name=I.column_name (+)".
" AND T.table_name=I.table_name (+)".
" AND T.table_name=UPPER('$table') ORDER BY T.column_id");

$i=0;
while ($this->next_record()) {
$res[$i]["table"] = $this->Record[table_name];
$res[$i]["name"] = strtolower($this->Record[column_name]);
$res[$i]["type"] = $this->Record[data_type];
$res[$i]["len"] = $this->Record[data_length];
if ($this->Record[index_name]) $res[$i]["flags"] = "INDEX ";
$res[$i]["flags"] .= ( $this->Record[nullable] == 'N') ? '' : 'NOT NULL';
$res[$i]["format"]= (int)$this->Record[data_precision].",".
(int)$this->Record[data_scale];
if ("0,0"==$res[$i]["format"]) $res[$i]["format"]='';
$res[$i]["index"] = $this->Record[index_name];
$res[$i]["chars"] = $this->Record[char_col_decl_length];
if ($full) {
$j=$res[$i]["name"];
$res["meta"][$j] = $i;
$res["meta"][strtoupper($j)] = $i;
switch ($res[$i]["type"]) {
case "VARCHAR2" :
case "VARCHAR" :
case "CHAR" :
$res["php_type"]="string";
$res["php_subtype"]="";
break;
case "DATE" :
$res["php_type"]="string";
$res["php_subtype"]="date";
break;
case "BLOB" :
case "CLOB" :
case "BFILE" :
case "RAW" :
case "LONG" :
case "LONG RAW" :
$res["php_type"]="string";
$res["php_subtype"]="blob";
break;
case "NUMBER" :
if ($res[$i]["format"]) {
$res["php_type"]="double";
$res["php_subtype"]="";
} else {
$res["php_type"]="int";
$res["php_subtype"]="";
}
break;
default :
$this->halt("metadata(): Type is not a valid value: '$res[$i][type]'");
break;
}
}
if ($full) $res["meta"][$res[$i]["name"]] = $i;
$i++;
}
if ($full) $res["num_fields"]=$i;
# $this->disconnect();
return $res;
}

## THIS FUNCTION IS UNSTESTED!
function affected_rows() {
if ($this->Debug) echo "<BR>Debug: affected_rows=". ora_numrows($this->Query_ID)."<BR>";
return ora_numrows($this->Query_ID);
}

## Known bugs: It will not work for SELECT DISTINCT and any
## other constructs which are depending on the resulting rows.
## So you *really need* to check every query you make, if it
## will work with it!
##
## Also, for a qualified replacement you need to parse the
## selection, cause this will fail: "SELECT id, from FROM ...").
## "from" is - as far as I know a keyword in Oracle, so it can
## only be used in this way. But you have been warned.
function num_rows() {
$curs=ora_open($this->Link_ID);

## this is the important part and it is also the HACK!
if (eregi("^[[:space:]]*SELECT[[:space:]]",$this->lastQuery) )  
{

# This works for all?? cases, including SELECT DISTINCT case.
# We just make select count(*) from original sql expression
# and remove ORDER BY (if any) for speed
# I like regular expressions too ;-)))  
$q = sprintf("SELECT COUNT(*) FROM (%s)",
@eregi_Replace("ORDER[[:space:]]+BY[^)]*()*)", "\1",  
$this->lastQuery)  
);

# works also for subselects:
# if (eregi("[[:space:]]+FROM([[:space:]]+.*[[:space:]]+FROM)",$this->lastQuery,$r))
# $areplace=$r[1];
# $q=eregi_Replace("^[[:space:]]*SELECT[[:space:]]+".
# ".*[[:space:]]+FROM",
# "SELECT COUNT(*) FROM$areplace",
# $this->lastQuery);

if ($this->Debug) echo "<BR>Debug: num_rows: $q<BR>";

ORA_parse($curs,$q);
ORA_exec($curs);
ORA_fetch($curs);
$result = ORA_getcolumn($curs,0);
ORA_close($curs);
if ($this->Debug)
{  
echo "<BR>Debug: ID ".$this->QueryID.
" num_rows=". $result ."<BR>";
}
return $result;
}  
else  
{
$this->halt("Last Query was not a SELECT: $this->lastQuery");
}
}

function num_fields() {
if ($this->Debug) echo "<BR>Debug: num_fields=". ora_numcols($this->Query_ID) . "<BR>";
return ora_numcols($this->Query_ID);
}

function nf() {
return $this->num_rows();
}

function np() {
print $this->num_rows();
}

function f($Name) {
return $this->Record[$Name];
}

function p($Name) {
print $this->Record[$Name];
}

/* public: sequence number */
function nextid($seq_name)
{
$this->connect();

/* Independent Query_ID */
$Query_ID = ora_open($this->Link_ID);

if(!@ora_parse($Query_ID,"SELECT $seq_name.NEXTVAL FROM DUAL"))  
{
// There is no such sequence yet, then create it
if(!@ora_parse($Query_ID,"CREATE SEQUENCE $seq_name")  
||
!@ora_exec($Query_ID)
)
{
$this->halt("<BR> nextid() function - unable to create sequence");
return 0;
}
@ora_parse($Query_ID,"SELECT $seq_name.NEXTVAL FROM DUAL");
}  
if (!@ora_exec($Query_ID)) {
$this->halt("<BR>ora_exec() failed:<BR>nextID function");
}
if (@ora_fetch($Query_ID) ) {
$next_id = ora_getcolumn($Query_ID, 0);
}
else {
$next_id = 0;
}
if ( $Query_ID > 0 ) {
ora_close($Query_ID);
}

return $next_id;
}

function disconnect() {
if($this->Debug) {
echo "Debug: Disconnecting $this->Query_ID...<br>n";
}
if ( $this->Query_ID < 1 ) {
echo "<B>Warning</B>: disconnect(): Cannot free ID $this->Query_IDn";
# return();
}
ora_close($this->Query_ID);
$this->Query_ID=0;
}

/* private: error handling */
function halt($msg) {
if ($this->Halt_On_Error == "no")
return;

$this->haltmsg($msg);

if ($this->Halt_On_Error != "report")
die("Session halted.");
}

function haltmsg($msg) {
printf("</td></tr></table><br><b>Database error:</b> %s<br>n", $msg);
printf("<b>Oracle Error</b>: %s (%s)<br>n",
$this->Errno,
$this->Error);
}

function table_names() {
$this->connect();
$this->query("
SELECT table_name,tablespace_name
FROM user_tables");
$i=0;
while ($this->next_record())
{
$info[$i]["table_name"] =$this->Record["table_name"];
$info[$i]["tablespace_name"]=$this->Record["tablespace_name"];
$i++;
}  
return $info;
}


// Some transaction support
// Methods are used in ct_oracle.inc
function begin_transaction()  
{
$this->connect();
// Now, disable autocommit
Ora_CommitOff($this->Link_ID);
if ($this->Debug)
{
print "BEGIN TRANSACTION<BR>";
}
}  
function end_transaction()  
{
if ($this->Debug)
{
print "BEGIN TRANSACTION<BR>";
}

$res = 1;
if(!@Ora_Commit($this->Link_ID))
{
Ora_CommitOn($this->Link_ID);
$this->halt("Unable to finish transaction");
$res = 0;
}
// Enable autocommit again
Ora_CommitOn($this->Link_ID);

if ($this->Debug)
{
print "END TRANSACTION : $res<BR>";
}
return $res;
}


}
?>