php教程:mysql数据库操作的DB类

代码拷贝框
<?php /* * mysql数据库 DB类 * @package db * @author yytcpt(无影) * @version 2008-03-27 * @copyrigth http://www.d5s.cn/ */ 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"]; } } ?>
[Ctrl+A 全部选择然后拷贝]

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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