起原：kingerq的 Blog 作者：kingerq的 Blog
">
<?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 $
*
*/
>
/* 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 on them. */
if ( $Query_String == "")
/* The empty query string is passed on from the constructor,
* when calling the > * like these: '''' $db = new DB_Sql_Sub> */
return 0;
if (! $this->connect()) {
return 0; /* we already complained in connect() about that. */
};
# New query, discard previous result.
if ( $this->Query_ID) {
$this->free();
}
if ( $this->Debug)
printf("Debug: query = %s<br>n", $Query_String);
$this->Query_ID = @mysql_query( $Query_String, $this->Link_ID);
$this->Row = 0;
$this->Errno = mysql_errno();
$this->Error = mysql_error();
if (! $this->Query_ID) {
$this->halt("Invalid SQL: ". $Query_String);
}
# Will return nada if it fails. That''''s fine.
return $this->Query_ID;
}
/* public: walk result set */
function next_record() {
if (! $this->Query_ID) {
$this->halt("next_record called with no query pending.");
return 0;
}
$this->Record = @mysql_fetch_array( $this->Query_ID);
$this->Row = 1;
$this->Errno = mysql_errno();
$this->Error = mysql_error();
$stat = is_array( $this->Record);
if (! $stat && $this->Auto_Free) {
$this->free();
}
return $stat;
}
/* public: insert record */
function insert( $table, $data) {
if ( is_array( $data ) ) {
$this->sql = "INSERT INTO $table ( `".implode( "` , `" , array_keys( $data) )."` )
VALUES ( ''''".implode( "'''' , ''''", array_values( $data) )."'''' )";
} else {
die("<strong>Error</strong> : Data Empty! ");
}
return $this->query( $this->sql );
}
/* public: delete record */
function delete( $table, $where = "", $limit = 0 ) {
$this->sql = "DELETE FROM $table ";
$this->sql .= $this->where( $where);
$this->sql .= intval( $limit) ? " LIMIT ". intval( $limit) : "";
return $this->query( $this->sql );
}
/* public: update record */
function update( $table, $update = "", $where = "", $limit = 0 ) {
$setword = "";
if( is_array( $update ) ) {
while ( list( $field, $value ) = each( $update) ) {
$setword .= $setword ? " , " : "";
$setword .= "` $field` = ''''". $value."''''";
}
}else {
$setword = $update;
}
$this->sql = "UPDATE $table SET $setword ";
$this->sql .= $this->where( $where);
$this->sql .= intval( $limit) ? " LIMIT ". intval( $limit) : "";
return $this->query( $this->sql );
}
/* public: count record */
function recordcount( $table, $where = "" ) {
$this->sql = "SELECT COUNT(*) FROM $table " . $this->where( $where);
$this->query( $this->sql );
if( $this->next_record() ) {
return $this->f(0);
}else {
return 0;
}
}
/* public: select record */
function select( $table, $fields = "*", $where = "", $order = "", $group = "", $limit = 10 ) {
}
/* public: set where */
function where( $where ) {
$condition = "";
if( is_array( $where ) ) {
foreach( $where as $key => $val ){
if( preg_match( "/^d* $/", $key ) ) {//or
foreach( $val as $k => $v ) {
$condition .= $condition
? " OR ( ` $k` = ''''".implode( "'''' AND ` $k` = ''''", $v )."'''' )"
: " WHERE ( ` $k` = ''''".implode( "'''' AND ` $k` = ''''", $v )."'''')";
}
}else {//and
$condition .= $condition
? " AND ( ` $key` = ''''".implode( "'''' OR ` $key` = ''''", $val )."'''')"
: " WHERE ( ` $key` = ''''".implode( "'''' OR ` $key` = ''''", $val )."'''')";
}
}
}else {
$condition .= " ". $where;
}
return $condition;
}
/* public: show sql */
function showsql() {
return $this->sql;
}
/* public: position in result set */
function seek( $pos = 0) {
$status = @mysql_data_seek( $this->Query_ID, $pos);
if ( $status)
$this->Row = $pos;
else {
$this->halt("seek( $pos) failed: result has ". $this->num_rows()." rows");
/* half assed attempt to save the day,
* but do not consider this documented or even
* desireable behaviour.
*/
@mysql_data_seek( $this->Query_ID, $this->num_rows());
$this->Row = $this->num_rows;
return 0;
}
return 1;
}
/* public: table locking */
function lock( $table, $mode="write") {
$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;
}
}
?>
版权声明：
原创作品，容许转载，转载时请务必以超链接方式标明文章 原始因由 、作者信息和本声明。不然将究查法律责任。