[php]mysql数据库操作—

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[php]mysql数据库操作——DB类

作者：yytcpt　时间： 2008-04-11　文档类型：原创　来自：蓝色理想

<?php

* mysql数据库 DB类

* @package db

* @author yytcpt(无影)

* @version 2008-03-27

* @copyrigth http://www./

class db {

var $connection_id = "";

var $pconnect = 0;

var $shutdown_queries = array();

var $queries = array();

var $query_id = "";

var $query_count = 0;

var $record_row = array();

var $failed = 0;

var $halt = "";

var $query_log = array();

function connect($db_config){

if ($this->pconnect){

$this->connection_id = mysql_pconnect($db_config["hostname"], $db_config["username"], $db_config["password"]);

}else{

$this->connection_id = mysql_connect($db_config["hostname"], $db_config["username"], $db_config["password"]);

}

if ( ! $this->connection_id ){

$this->halt("Can not connect MySQL Server");

}

if ( ! @mysql_select_db($db_config["database"], $this->connection_id) ){

$this->halt("Can not connect MySQL Database");

}

if ($db_config["charset"]) {

@mysql_unbuffered_query("SET NAMES '".$db_config["charset"]."'");

}

return true;

}

//发送SQL 查询，并返回结果集

function query($query_id, $query_type='mysql_query'){

$this->query_id = $query_type($query_id, $this->connection_id);

$this->queries[] = $query_id;

if (! $this->query_id ) {

$this->halt("查询失败:\n$query_id");

}

$this->query_count++;

$this->query_log[] = $str;

return $this->query_id;

}

//发送SQL 查询，并不获取和缓存结果的行

function query_unbuffered($sql=""){

return $this->query($sql, 'mysql_unbuffered_query');

}

//从结果集中取得一行作为关联数组

function fetch_array($sql = ""){

if ($sql == "") $sql = $this->query_id;

$this->record_row = @mysql_fetch_array($sql, MYSQL_ASSOC);

return $this->record_row;

}

function shutdown_query($query_id = ""){

$this->shutdown_queries[] = $query_id;

}

//取得结果集中行的数目，仅对 INSERT，UPDATE 或者 DELETE

function affected_rows() {

return @mysql_affected_rows($this->connection_id);

}

//取得结果集中行的数目，仅对 SELECT 语句有效

function num_rows($query_id="") {

if ($query_id == "") $query_id = $this->query_id;

return @mysql_num_rows($query_id);

}

//返回上一个 MySQL 操作中的错误信息的数字编码

function get_errno(){

$this->errno = @mysql_errno($this->connection_id);

return $this->errno;

}

//取得上一步 INSERT 操作产生的 ID

function insert_id(){

return @mysql_insert_id($this->connection_id);

}

//得到查询次数

function query_count() {

return $this->query_count;

}

//释放结果内存

function free_result($query_id=""){

if ($query_id == "") $query_id = $this->query_id;

@mysql_free_result($query_id);

}

//关闭 MySQL 连接

function close_db(){

if ( $this->connection_id ) return @mysql_close( $this->connection_id );

}

//列出 MySQL 数据库中的表

function get_table_names(){

global $db_config;

$result = mysql_list_tables($db_config["database"]);

$num_tables = @mysql_numrows($result);

for ($i = 0; $i < $num_tables; $i++) {

$tables[] = mysql_tablename($result, $i);

}

mysql_free_result($result);

return $tables;

}

//从结果集中取得列信息并作为对象返回，取得所有字段

function get_result_fields($query_id=""){

if ($query_id == "") $query_id = $this->query_id;

while ($field = mysql_fetch_field($query_id)) {

$fields[] = $field;

}

return $fields;

}

//错误提示

function halt($the_error=""){

$message = $the_error."<br/>\r\n";

$message.= $this->get_errno() . "<br/>\r\n";

$sql = "INSERT INTO `db_error`(pagename, errstr, timer) VALUES('".$_SERVER["PHP_SELF"]."', '".addslashes($message)."', ".time().")";

@mysql_unbuffered_query($sql);

if (DEBUG==true){

echo "<html><head><title>MySQL 数据库错误</title>";

echo "<style type=\"text/css\"></style></head>\r\n";

echo "<body>\r\n";

echo "<blockquote>\r\n";

echo "<textarea class=\"error\" rows=\"15\" cols=\"100\" wrap=\"on\" >" . htmlspecialchars($message) . "</textarea>\r\n";

echo "</blockquote>\r\n</body></html>";

exit;

}

function __destruct(){

$this->shutdown_queries = array();

$this->close_db();

}

function sql_select($tbname, $where="", $limit=0, $fields="*", $orderby="id", $sort="DESC"){

$sql = "SELECT ".$fields." FROM `".$tbname."` ".($where?" WHERE ".$where:"")." ORDER BY ".$orderby." ".$sort.($limit ? " limit ".$limit:"");

return $sql;

}

function sql_insert($tbname, $row){

foreach ($row as $key=>$value) {

$sqlfield .= $key.",";

$sqlvalue .= "'".$value."',";

}

return "INSERT INTO `".$tbname."`(".substr($sqlfield, 0, -1).") VALUES (".substr($sqlvalue, 0, -1).")";

}

function sql_update($tbname, $row, $where){

foreach ($row as $key=>$value) {

$sqlud .= $key."= '".$value."',";

}

return "UPDATE `".$tbname."` SET ".substr($sqlud, 0, -1)." WHERE ".$where;

}

function sql_delete($tbname, $where){

return "DELETE FROM `".$tbname."` WHERE ".$where;

}

//新增加一条记录

function row_insert($tbname, $row){

$sql = $this->sql_insert($tbname, $row);

return $this->query_unbuffered($sql);

}

//更新指定记录

function row_update($tbname, $row, $where){

$sql = $this->sql_update($tbname, $row, $where);

return $this->query_unbuffered($sql);

}

//删除满足条件的记录

function row_delete($tbname, $where){

$sql = $this->sql_delete($tbname, $where);

return $this->query_unbuffered($sql);

}

/* 根据条件查询，返回所有记录

* $tbname 表名, $where 查询条件, $limit 返回记录, $fields 返回字段

function row_select($tbname, $where="", $limit=0, $fields="*", $orderby="id", $sort="DESC"){

$sql = $this->sql_select($tbname, $where, $limit, $fields, $orderby, $sort);

return $this->row_query($sql);

}

//详细显示一条记录

function row_select_one($tbname, $where, $fields="*", $orderby="id"){

$sql = $this->sql_select($tbname, $where, 1, $fields, $orderby);

return $this->row_query_one($sql);

}

function row_query($sql){

$rs = $this->query($sql);

$rs_num = $this->num_rows($rs);

$rows = array();

for($i=0; $i<$rs_num; $i++){

$rows[] = $this->fetch_array($rs);

}

$this->free_result($rs);

return $rows;

}

function row_query_one($sql){

$rs = $this->query($sql);

$row = $this->fetch_array($rs);

$this->free_result($rs);

return $row;

}

//计数统计

function row_count($tbname, $where=""){

$sql = "SELECT count(id) as row_sum FROM `".$tbname."` ".($where?" WHERE ".$where:"");

$row = $this->row_query_one($sql);

return $row["row_sum"];

}

很久没有发帖了，把我常用的一些php类文件分享出来。
如果您加了新功能，或者是有改进，请与大家一起分享。

<?php
    $db_config["hostname"]    = "127.0.0.1";    //服务器地址
    $db_config["username"]    = "root";        //数据库用户名
    $db_config["password"]    = "root";        //数据库密码
    $db_config["database"]    = "wap_blueidea_com";        //数据库名称
    $db_config["charset"]        = "utf8";
    include('db.php');
    $db    = new db();
    $db->connect($db_config);
    //例：查询表 table_name 中 cid=1的所有记录。
    $row = $db->row_select('table_name', 'cid=1');
?>

更详细的使用方法，请参考 db类文件中的注释。

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http://bbs./thread-2841335-1-1.html

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