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;
}
}
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