PHP实现的构造sql语句类实例,构造sql语句实例
本文实例讲述了PHP实现的构造sql语句类。分享给大家供大家参考,具体如下:
/** * @package Database Class * @author injection (mail:injection.mail@gmail.com) * @version 1.0 */ @ini_set( 'display_errors',0 ); class DataBase{ private $mDb_host,$mAb_user,$mAb_pwd,$mConn_No; function DataBase( $Conn_Obj ){ $this->connectDb( $Conn_Obj ); } function connectDb( $Conn_Obj ){ $this->mDb_host = $Conn_Obj->host; $this->mAd_name = $Conn_Obj->user; $this->mAd_pwd = $Conn_Obj->pwd; $this->mConn_No = mysql_connect( $this->mDb_host, $this->mAd_name, $this->mAd_pwd ); } function selectDb( $Conn_Obj ){ $this->mDb_name = $Conn_Obj->dbname; mysql_select_db( $this->mDb_name ); } } /** * @package Making Sqls Class exetends Database Class * @author injection (mail:injection.mail@gmail.com) * @version 1.0 */ class MakeSql extends DataBase{ private $mSql; function MakeSql( $type,$arr_colum_list, $arr_sql_choice ){ $this->MakeSqlType( $arr_colum_list, $arr_sql_choice ); } //switch make list function MakeSqlType( $type, $arr_colum_list, $arr_sql_choice ){ switch( $type ){ case 'insert': return $this->makeInsert( $arr_colum_list, $arr_sql_choice ); case 'select': return $this->makeSelect( $arr_colum_list, $arr_sql_choice ); case 'update': return $this->makeUpdate( $arr_colum_list, $arr_sql_choice ); case 'delete': return $this->makeDelete( $arr_colum_list, $arr_sql_choice ); } } //make insert function makeInsert( $arr_colum_list,$arr_sql_choice ){ $colum_key = array_keys( $arr_colum_list ); $colum_value = array_values( $arr_colum_list ); $this->mSql = "INSERT INTO ".$arr_sql_choice["tbl_name"]."( ".join( ',' , $colum_key )." ) VALUES( '".join( "','" , $colum_value )."')"; return $this->mSql; } //making select function makeSelect( $arr_colum_list = '*' , $arr_sql_choice ){ $colum_value = array_keys( $arr_colum_list ); foreach( $arr_sql_choice as $sql_key => $sql_value ){ if( strcmp( $sql_key, 'tbl_name' ) == 0 ){ if( strcmp($arr_colum_list, '*' ) !== 0 ) $this->mSql = "SELECT ".join( ',' , $colum_value )." FROM ".$sql_value; else $this->mSql = "SELECT * FROM ".$sql_value; } else if( strcmp( $sql_value, '' ) !== 0 ) if(strcmp( $sql_key, 'WHERE' ) === 0 && strcmp( $sql_value, 'colum' ) === 0 ){ foreach($arr_colum_list As $colum_key => $colum_value ) $this->mSql .= "$colum_key = '$colum_value' AND "; $this->mSql = rtrim( $this->mSql, " AND " ); } else $this->mSql .= " $sql_key ".$sql_value; } return $this->mSql; } //making update function makeUpdate( $arr_colum_list, $arr_sql_choice ){ $this->mSql = "UPDATE ".$arr_sql_choice['tbl_name']." SET "; foreach( $arr_colum_list as $colum_key => $colum_value ) $this->mSql .= "$colum_key = '$colum_value',"; $this->mSql = rtrim( $this->mSql , ','); foreach( $arr_sql_choice as $sql_key => $sql_value ){ if( strcmp( $sql_value, '' ) !== 0 && strcmp( $sql_key, 'tbl_name' ) !==0 && strcmp( $sql_key, 'ORDER BY' ) !== 0 ) $this->mSql .= " $sql_key ".$sql_value; } return $this->mSql; } //making delete function makeDelete( $arr_colum_list, $arr_sql_choice ){ $this->mSql = "DELETE FROM ".$arr_sql_choice['tbl_name']; foreach( $arr_sql_choice as $sql_key => $sql_value ){ if( strcmp( $sql_key, 'tbl_name' ) !== 0 && strcmp( $sql_value, '' ) !== 0 ){ $this->mSql .= " $sql_key ".$sql_value; } } return $this->mSql; } }
更多关于PHP相关内容感兴趣的读者可查看本站专题:《php+mysql数据库操作入门教程》、《php防止SQL注入方法总结》、《PHP基于pdo操作数据库技巧总结》及《php常见数据库操作技巧汇总》
希望本文所述对大家PHP程序设计有所帮助。
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php把负数转为正整数的方法:1、使用abs()函数将负数转为正数,使用intval()函数对正数取整,转为正整数,语法“intval(abs($number))”;2、利用“~”位运算符将负数取反加一,语法“~$number + 1”。

实现方法:1、使用“sleep(延迟秒数)”语句,可延迟执行函数若干秒;2、使用“time_nanosleep(延迟秒数,延迟纳秒数)”语句,可延迟执行函数若干秒和纳秒;3、使用“time_sleep_until(time()+7)”语句。

php除以100保留两位小数的方法:1、利用“/”运算符进行除法运算,语法“数值 / 100”;2、使用“number_format(除法结果, 2)”或“sprintf("%.2f",除法结果)”语句进行四舍五入的处理值,并保留两位小数。

判断方法:1、使用“strtotime("年-月-日")”语句将给定的年月日转换为时间戳格式;2、用“date("z",时间戳)+1”语句计算指定时间戳是一年的第几天。date()返回的天数是从0开始计算的,因此真实天数需要在此基础上加1。

方法:1、用“str_replace(" ","其他字符",$str)”语句,可将nbsp符替换为其他字符;2、用“preg_replace("/(\s|\ \;||\xc2\xa0)/","其他字符",$str)”语句。

php判断有没有小数点的方法:1、使用“strpos(数字字符串,'.')”语法,如果返回小数点在字符串中第一次出现的位置,则有小数点;2、使用“strrpos(数字字符串,'.')”语句,如果返回小数点在字符串中最后一次出现的位置,则有。

php字符串有下标。在PHP中,下标不仅可以应用于数组和对象,还可应用于字符串,利用字符串的下标和中括号“[]”可以访问指定索引位置的字符,并对该字符进行读写,语法“字符串名[下标值]”;字符串的下标值(索引值)只能是整数类型,起始值为0。

在php中,可以使用substr()函数来读取字符串后几个字符,只需要将该函数的第二个参数设置为负值,第三个参数省略即可;语法为“substr(字符串,-n)”,表示读取从字符串结尾处向前数第n个字符开始,直到字符串结尾的全部字符。


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