本文实例讲述了PHP简单数据库操作类。分享给大家供大家参考,具体如下:
在进行项目开发时,数据库是必不可少的东西了。但是很多时候却又对数据库SQL语句的繁杂而感到头疼。提供一个我自己使用的数据库操作类(模型Model),供大家使用。支持增、删、改、查,支持链式操作,代码不到100行,非常小巧方便,很适合小项目的快速部署使用。
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/** * * @Authot: summer * * @E-mail: wenghang1228@me.com * * @Data: 2015-02-06 * * @Project: 数据库操作类Model * * @Version:1.0 * * @版权所有:夏天的风————记录夏天对技术的追求与生活的热爱 * * @网址: http://www.xtwind.com **/ class Model{ public $field ; public $tabname ; public $where ; public $order ; public $limit ; //构造函数,链接数据库,给表赋值 function __construct( $tabname ){ mysql_connect(HOST,USER,PASSWORD); mysql_select_db(DBNAME); mysql_query( "set names utf8" ); $this ->tabname= $tabname ; } //组合字段 function field( $field ){ $this -> $field = $field ; return $this ; } //组合where条件 function where( $where ){ $this ->where= "where " . $where ; return $this ; } //组合order排序条件 function order( $order ){ $this ->order= "order by " . $order ; return $this ; } //组合limit限制条数 function limit( $limit ){ $this ->limit= "limit " . $limit ; return $this ; } //组合和执行select语句 function select( $all = "" ){ if ( $all ) { $sql = "select {$all} from {$this->tabname} order by id" ; } else { $sql = "select {$this->filed} from {$this->tabname} {$this->where} {$this->order} {$this->limit}" ; } $rst =mysql_query( $sql ); while ( $row =mysql_fetch_assoc( $rst )) { $rows []= $row ; } return $rows ; } //组合和执行insert语句 function insert( $post ){ //数据库插入操作,接收数组 foreach ( $post as $key => $value ) { $keys []= $key ; $vals []= "'" . $valu . "'" ; } $keyStr =join( "," , $keys ); $valStr =join( "," , $vals ); $sql = "insert into {$this->tabname}($keystr) values()" ; if (mysql_query( $sql )) { return mysql_insert_id(); } else { return false; } } //组合和执行delect语句 function delect(){ $sql = "delect from {$this->tabname} {$this->where}" ; if (mysql_query( $sql )) { return mysql_affected_rows(); } else { return false; } } //组合和执行updata语句 function update( $post ){ foreach ( $psot as $key => $value ) { $sets []= "{$key}='{$val}'" ; } $setStr =join( "," , $sets ); $sql = "update {$this->tabname} set {$setStr} {$this->where} " ; if (mysql_query( $sql )) { return mysql_affected_rows(); } else { return false; } } //从表中取一行数据 function find(){ if ( $this ->order) { $sql = "select * from {$this->tabname} {$this->order} limit 1" ; } else { $sql = "select * from {$this->tabname} order by id limit 1" ; } $rst =mysql_query( $sql ); while ( $row =mysql_fetch_assoc( $rst )) { $rows []= $row ; } return $rows ; } //获取总行数 function total(){ $sql = "select count(*) from {$this->tabname}" ; $rst =mysql_query( $sql ); if ( $rst ) { $row =mysql_fetch_row( $rst ); return $row [0]; } else { return false; } } } //Model类对象工厂 function M( $tabname ){ return new Model( $tabname ); } define( "HOST" , "localhost" ); define( "USER" , "root" ); define( "PASSWORD" , "123456" ); define( "DBNAME" , "test" ) $user = new Model( "user" ); $user ->field( "id,name" )->where( "id=3" )->order( "id desc" )->limit( "3" )->select(); |
完整实例代码点击此处本站下载。
希望本文所述对大家PHP程序设计有所帮助。