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发表于 2004-3-22 20:31:24
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不关闭也没有关系,MySQL会自动的关闭,但是建议您关闭
个人整理的常用操作
[PHP]
<?php
/***************************************************************************
* DB.php
* -------------------
* Begin : Tuesday, Mar 9, 2004
* Copyright : (C)2004 The StarDust Studio
* Written : Alchemy of Group
* E-mail : root@alchemy.cn
***************************************************************************/
class sql_db
{
var $db_connect_id;
var $query_result;
var $row = array();
var $rowset = array();
var $num_queries = 0;
var $in_transaction = 0;
// 析构器 sql_db('数据库服务器','数据库用户名','用户密码','数据库名称','是否持续连接')
//===================================================================
function sql_db($sqlserver, $sqluser, $sqlpassword, $database, $persistency = true)
{
$this->persistency = $persistency;
$this->user = $sqluser;
$this->password = $sqlpassword;
$this->server = $sqlserver;
$this->dbname = $database;
// 连接数据库
$this->db_connect_id = ($this->persistency) ? mysql_pconnect($this->server, $this->user, $this->password) : mysql_connect($this->server, $this->user, $this->password);
// 检查连接状态
if( $this->db_connect_id ){
if( $database != "" ){
$this->dbname = $database;
$dbselect = mysql_select_db($this->dbname);
if( !$dbselect ){
mysql_close($this->db_connect_id);
$this->db_connect_id = $dbselect;
}
}
return $this->db_connect_id;
}
else{
return false;
}
}
// 关闭数据库
//===================================================================
function sql_close(){
if( $this->db_connect_id ){
// 残余事物处理
if( $this->in_transaction ){
mysql_query("COMMIT", $this->db_connect_id);
}
return mysql_close($this->db_connect_id);
}
else{
return false;
}
}
// 基本查询
//===================================================================
function sql_query($query = "", $transaction = FALSE){
// 清除以前的结果
unset($this->query_result);
if( $query != "" ){
$this->num_queries++;
if( $transaction == BEGIN_TRANSACTION && !$this->in_transaction ){
$result = mysql_query("BEGIN", $this->db_connect_id);
if(!$result){
return false;
}
$this->in_transaction = TRUE;
}
$this->query_result = mysql_query($query, $this->db_connect_id);
}
else{
if( $transaction == END_TRANSACTION && $this->in_transaction ){
$result = mysql_query("COMMIT", $this->db_connect_id);
}
}
if( $this->query_result )
{
unset($this->row[$this->query_result]);
unset($this->rowset[$this->query_result]);
if( $transaction == END_TRANSACTION && $this->in_transaction ){
$this->in_transaction = FALSE;
if ( !mysql_query("COMMIT", $this->db_connect_id) ){
mysql_query("ROLLBACK", $this->db_connect_id);
return false;
}
}
return $this->query_result;
}
else{
if( $this->in_transaction ){
mysql_query("ROLLBACK", $this->db_connect_id);
$this->in_transaction = FALSE;
}
return false;
}
}
// 额外查询
//===================================================================
// 得到传回行的数目
function sql_numrows($query_id = 0){
if( !$query_id ){
$query_id = $this->query_result;
}
return ( $query_id ) ? mysql_num_rows($query_id) : false;
}
// 最后查询操作 INSERT、UPDATE 或 DELETE 所影响的行 (row) 数目
function sql_affectedrows(){
return ( $this->db_connect_id ) ? mysql_affected_rows($this->db_connect_id) : false;
}
// 得到传回纪录的数目
function sql_numfields($query_id = 0){
if( !$query_id ){
$query_id = $this->query_result;
}
return ( $query_id ) ? mysql_num_fields($query_id) : false;
}
// 取得指定纪录的名称
function sql_fieldname($offset, $query_id = 0){
if( !$query_id ){
$query_id = $this->query_result;
}
return ( $query_id ) ? mysql_field_name($query_id, $offset) : false;
}
// 到到目前所在纪录的型态格式
function sql_fieldtype($offset, $query_id = 0){
if( !$query_id ){
$query_id = $this->query_result;
}
return ( $query_id ) ? mysql_field_type($query_id, $offset) : false;
}
// 将查询结果 result 拆到数组中
function sql_fetchrow($query_id = 0){
if( !$query_id ){
$query_id = $this->query_result;
}
if( $query_id ){
$this->row[$query_id] = mysql_fetch_array($query_id, MYSQL_ASSOC);
return $this->row[$query_id];
}
else{
return false;
}
}
function sql_fetchrowset($query_id = 0){
if( !$query_id ){
$query_id = $this->query_result;
}
if( $query_id ){
unset($this->rowset[$query_id]);
unset($this->row[$query_id]);
while($this->rowset[$query_id] = mysql_fetch_array($query_id, MYSQL_ASSOC)){
$result[] = $this->rowset[$query_id];
}
return $result;
}
else{
return false;
}
}
// 获得结果
function sql_fetchfield($field, $rownum = -1, $query_id = 0){
if( !$query_id ){
$query_id = $this->query_result;
}
if( $query_id ){
if( $rownum > -1 ){
$result = mysql_result($query_id, $rownum, $field);
}
else{
if( empty($this->row[$query_id]) && empty($this->rowset[$query_id]) ){
if( $this->sql_fetchrow() ){
$result = $this->row[$query_id][$field];
}
}
else{
if( $this->rowset[$query_id] ){
$result = $this->rowset[$query_id][$field];
}
else if( $this->row[$query_id] ){
$result = $this->row[$query_id][$field];
}
}
}
return $result;
}
else{
return false;
}
}
// 移动内部传回的列指针到指定的 $rownum 去
function sql_rowseek($rownum, $query_id = 0){
if( !$query_id ){
$query_id = $this->query_result;
}
return ( $query_id ) ? mysql_data_seek($query_id, $rownum) : false;
}
// 得到最后一次使用 INSERT 到 MySQL 数据库的执行 ID
function sql_nextid(){
return ( $this->db_connect_id ) ? mysql_insert_id($this->db_connect_id) : false;
}
// 以释放内存
function sql_freeresult($query_id = 0){
if( !$query_id ){
$query_id = $this->query_result;
}
if ( $query_id ){
unset($this->row[$query_id]);
unset($this->rowset[$query_id]);
mysql_free_result($query_id);
return true;
}
else{
return false;
}
}
// 传回数据库的错误信息
function sql_error(){
$result['message'] = mysql_error($this->db_connect_id);
$result['code'] = mysql_errno($this->db_connect_id);
return $result;
}
}
?>
[/PHP] |
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