在PHPLIB中的MYSQL类中加INSERT,UPDATE,DELETE等函数
<?php
/*
* Session Management for PHP3
*
* Copyright (c) 1998-2000 NetUSE AG
* Boris Erdmann, Kristian Koehntopp
*
* $Id: db_mysql.inc,v 1.2 2000/07/12 18:22:34 kk Exp $
*
*/
class DB_Sql {
/* public: connection parameters */
var $Host = "";
var $Database = "";
var $User = "";
var $Password = "";
/* public: configuration parameters */
var $Auto_Free = 0; ## Set to 1 for automatic mysql_free_result()
var $Debug = 0; ## Set to 1 for debugging messages.
var $Halt_On_Error = "yes"; ## "yes" (halt with message), "no" (ignore errors quietly), "report" (ignore errror, but spit a warning)
var $Seq_Table = "db_sequence";
/* public: result array and current row number */
var $Record = array();
var $Row;
/* public: current error number and error text */
var $Errno = 0;
var $Error = "";
/* public: this is an api revision, not a CVS revision. */
var $type = "mysql";
var $revision = "1.2";
/* private: link and query handles */
var $Link_ID = 0;
var $Query_ID = 0;
var $sql = "";
/* 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;
}
/* public: connection management */
function connect( $Database = "", $Host = "", $User = "", $Password = "") {
/* Handle defaults */
if ("" == $Database)
$Database = $this->Database;
if ("" == $Host)
$Host = $this->Host;
if ("" == $User)
$User = $this->User;
if ("" == $Password)
$Password = $this->Password;
/* establish connection, select database */
if ( 0 == $this->Link_ID ) {
$this->Link_ID=mysql_pconnect( $Host, $User, $Password);
if (! $this->Link_ID) {
$this->halt("pconnect( $Host, $User, $Password) failed.");
return 0;
}
if (!@mysql_select_db( $Database, $this->Link_ID)) {
$this->halt("cannot use database ". $this->Database);
return 0;
}
}
return $this->Link_ID;
}
/* public: discard the query result */
function free() {
@mysql_free_result( $this->Query_ID);
$this->Query_ID = 0;
}
/* public: perform a query */
function query( $Query_String) {
/* No empty queries, please, since PHP4 chokes) {
$this->connect();
$query="lock tables ";
if (is_array( $table)) {
while (list( $key, $value)=each( $table)) {
if ( $key=="read" && $key!=0) {
$query.=" $value read, ";
} else {
$query.=" $value $mode, ";
}
}
$query=substr( $query,0,-2);
} else {
$query.=" $table $mode";
}
$res = @mysql_query( $query, $this->Link_ID);
if (! $res) {
$this->halt("lock( $table, $mode) failed.");
return 0;
}
return $res;
}
function unlock() {
$this->connect();
$res = @mysql_query("unlock tables");
if (! $res) {
$this->halt("unlock() failed.");
return 0;
}
return $res;
}
/* public: evaluate the result (size, width) */
function affected_rows() {
return @mysql_affected_rows( $this->Link_ID);
}
function num_rows() {
return @mysql_num_rows( $this->Query_ID);
}
function num_fields() {
return @mysql_num_fields( $this->Query_ID);
}
/* public: shorthand notation */
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 numbers */
function nextid( $seq_name) {
$this->connect();
if ( $this->lock( $this->Seq_Table)) {
/* get sequence number (locked) and increment */
$q = sprintf("select nextid from %s where seq_name = ''''%s''''",
$this->Seq_Table,
$seq_name);
$id = @mysql_query( $q, $this->Link_ID);
$res = @mysql_fetch_array( $id);
/* No current value, make one */
if (!is_array( $res)) {
$currentid = 0;
$q = sprintf("insert into %s values(''''%s'''', %s)",
$this->Seq_Table,
$seq_name,
$currentid);
$id = @mysql_query( $q, $this->Link_ID);
} else {
$currentid = $res["nextid"];
}
$nextid = $currentid + 1;
$q = sprintf("update %s set nextid = ''''%s'''' where seq_name = ''''%s''''",
$this->Seq_Table,
$nextid,
$seq_name);
$id = @mysql_query( $q, $this->Link_ID);
$this->unlock();
} else {
$this->halt("cannot lock ". $this->Seq_Table." - has it been created?");
return 0;
}
return $nextid;
}
/* public: return table metadata */
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
*
* - 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
* ["meta"][field name] index of field named "field name"
* The last one is used, if you have a field name, but no index.
* Test: if (isset( $result[''''meta''''][''''myfield''''])) { ...
*/
// if no $table specified, assume that we are working with a query
// result
if ( $table) {
$this->connect();
$id = @mysql_list_fields( $this->Database, $table);
if (! $id)
$this->halt("Metadata query failed.");
} else {
$id = $this->Query_ID;
if (! $id)
$this->halt("No query specified.");
}
$count = @mysql_num_fields( $id);
// made this IF due to performance (one if is faster than $count if''''s)
if (! $full) {
for ( $i=0; $i< $count; $i++) {
$res[ $i]["table"] = @mysql_field_table ( $id, $i);
$res[ $i]["name"] = @mysql_field_name ( $id, $i);
$res[ $i]["type"] = @mysql_field_type ( $id, $i);
$res[ $i]["len"] = @mysql_field_len ( $id, $i);
$res[ $i]["flags"] = @mysql_field_flags ( $id, $i);
}
} else { // full
$res["num_fields"]= $count;
for ( $i=0; $i< $count; $i++) {
$res[ $i]["table"] = @mysql_field_table ( $id, $i);
$res[ $i]["name"] = @mysql_field_name ( $id, $i);
$res[ $i]["type"] = @mysql_field_type ( $id, $i);
$res[ $i]["len"] = @mysql_field_len ( $id, $i);
$res[ $i]["flags"] = @mysql_field_flags ( $id, $i);
$res["meta"][ $res[ $i]["name"]] = $i;
}
}
// free the result only if we were called on a table
if ( $table) @mysql_free_result( $id);
return $res;
}
/* private: error handling */
function halt( $msg) {
$this->Error = @mysql_error( $this->Link_ID);
$this->Errno = @mysql_errno( $this->Link_ID);
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><b>Database error:</b> %s<br>n", $msg);
printf("<b>MySQL Error</b>: %s (%s)<br>n",
$this->Errno,
$this->Error);
}
function table_names() {
$this->query("SHOW TABLES");
$i=0;
while ( $info=mysql_fetch_row( $this->Query_ID))
{
$return[ $i]["table_name"]= $info[0];
$return[ $i]["tablespace_name"]= $this->Database;
$return[ $i]["database"]= $this->Database;
$i++;
}
return $return;
}
}
?>
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