Constructed sql statement class instance implemented by PHP

The example in this article describes the constructed sql statement class implemented by PHP. Share it with everyone for your reference, the details are as follows:

/**
* @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;
 }
}

Readers who are interested in more PHP-related content can check out the special topics of this site: "Introduction Tutorial on PHP+MySQL Database Operation", "Summary of PHP Methods to Prevent SQL Injection", "Summary of PHP Database Operation Skills Based on PDO" and "Summary of Common PHP Database Operation Skills"

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