diff --git a/adm/contentlist.php b/adm/contentlist.php
index 7f8ce87ca..bdd929bb9 100644
--- a/adm/contentlist.php
+++ b/adm/contentlist.php
@@ -69,7 +69,7 @@ $result = sql_query($sql);
     </tr>
     </thead>
     <tbody>
-    <?php for ($i=0; $row=mysql_fetch_array($result); $i++) {
+    <?php for ($i=0; $row=sql_fetch_array($result); $i++) {
         $bg = 'bg'.($i%2);
     ?>
     <tr class="<?php echo $bg; ?>">
diff --git a/adm/faqformupdate.php b/adm/faqformupdate.php
index 722a6c3a4..723850c95 100644
--- a/adm/faqformupdate.php
+++ b/adm/faqformupdate.php
@@ -21,7 +21,7 @@ if ($w == "")
                     $sql_common ";
     sql_query($sql);
 
-    $fa_id = mysql_insert_id();
+    $fa_id = sql_insert_id();
 }
 else if ($w == "u")
 {
diff --git a/adm/faqmasterformupdate.php b/adm/faqmasterformupdate.php
index f6987d795..d86e0eed4 100644
--- a/adm/faqmasterformupdate.php
+++ b/adm/faqmasterformupdate.php
@@ -31,7 +31,7 @@ if ($w == "")
     $sql = " insert {$g5['faq_master_table']} $sql_common ";
     sql_query($sql);
 
-    $fm_id = mysql_insert_id();
+    $fm_id = sql_insert_id();
 }
 else if ($w == "u")
 {
diff --git a/adm/faqmasterlist.php b/adm/faqmasterlist.php
index c21ea47e2..c60c5accb 100644
--- a/adm/faqmasterlist.php
+++ b/adm/faqmasterlist.php
@@ -93,7 +93,7 @@ $result = sql_query($sql);
     </tr>
     </thead>
     <tbody>
-    <?php for ($i=0; $row=mysql_fetch_array($result); $i++) {
+    <?php for ($i=0; $row=sql_fetch_array($result); $i++) {
         $sql1 = " select COUNT(*) as cnt from {$g5['faq_table']} where fm_id = '{$row['fm_id']}' ";
         $row1 = sql_fetch($sql1);
         $cnt = $row1['cnt'];
diff --git a/adm/mail_list.php b/adm/mail_list.php
index 6dfbd44ef..910b588c9 100644
--- a/adm/mail_list.php
+++ b/adm/mail_list.php
@@ -51,7 +51,7 @@ $colspan = 7;
     </thead>
     <tbody>
     <?php
-    for ($i=0; $row=mysql_fetch_array($result); $i++) {
+    for ($i=0; $row=sql_fetch_array($result); $i++) {
         $s_vie = '<a href="./mail_preview.php?ma_id='.$row['ma_id'].'" target="_blank">미리보기</a>';
 
         $num = number_format($total_count - ($page - 1) * $config['cf_page_rows'] - $i);
diff --git a/adm/newwinformupdate.php b/adm/newwinformupdate.php
index e5fd4a6fc..2b2dce60e 100644
--- a/adm/newwinformupdate.php
+++ b/adm/newwinformupdate.php
@@ -28,7 +28,7 @@ if($w == "")
     $sql = " insert {$g5['new_win_table']} set $sql_common ";
     sql_query($sql);
 
-    $nw_id = mysql_insert_id();
+    $nw_id = sql_insert_id();
 }
 else if ($w == "u")
 {
diff --git a/adm/newwinlist.php b/adm/newwinlist.php
index ecc1217db..bdbc3beb0 100644
--- a/adm/newwinlist.php
+++ b/adm/newwinlist.php
@@ -71,7 +71,7 @@ $result = sql_query($sql);
     </thead>
     <tbody>
     <?php
-    for ($i=0; $row=mysql_fetch_array($result); $i++) {
+    for ($i=0; $row=sql_fetch_array($result); $i++) {
         $bg = 'bg'.($i%2);
 
         switch($row['nw_device']) {
diff --git a/adm/poll_form_update.php b/adm/poll_form_update.php
index 19a11b49d..f9cdc17f8 100644
--- a/adm/poll_form_update.php
+++ b/adm/poll_form_update.php
@@ -17,7 +17,7 @@ if ($w == '')
              values ( '{$_POST['po_subject']}', '{$_POST['po_poll1']}', '{$_POST['po_poll2']}', '{$_POST['po_poll3']}', '{$_POST['po_poll4']}', '{$_POST['po_poll5']}', '{$_POST['po_poll6']}', '{$_POST['po_poll7']}', '{$_POST['po_poll8']}', '{$_POST['po_poll9']}', '{$_POST['po_cnt1']}', '{$_POST['po_cnt2']}', '{$_POST['po_cnt3']}', '{$_POST['po_cnt4']}', '{$_POST['po_cnt5']}', '{$_POST['po_cnt6']}', '{$_POST['po_cnt7']}', '{$_POST['po_cnt8']}', '{$_POST['po_cnt9']}', '{$_POST['po_etc']}', '{$_POST['po_level']}', '{$_POST['po_point']}', '".G5_TIME_YMD."' ) ";
     sql_query($sql);
 
-    $po_id = mysql_insert_id();
+    $po_id = sql_insert_id();
 }
 else if ($w == 'u')
 {
diff --git a/adm/popular_rank.php b/adm/popular_rank.php
index e2bdd737d..3bce6dca1 100644
--- a/adm/popular_rank.php
+++ b/adm/popular_rank.php
@@ -16,7 +16,7 @@ $sql_order = " order by cnt desc ";
 
 $sql = " select pp_word {$sql_common} {$sql_search} {$sql_group} ";
 $result = sql_query($sql);
-$total_count = mysql_num_rows($result);
+$total_count = sql_num_rows($result);
 
 $rows = $config['cf_page_rows'];
 $total_page  = ceil($total_count / $rows);  // 전체 페이지 계산
diff --git a/adm/sms_admin/_common.php b/adm/sms_admin/_common.php
index 4afeddf37..50def26fd 100644
--- a/adm/sms_admin/_common.php
+++ b/adm/sms_admin/_common.php
@@ -5,7 +5,7 @@ include_once(G5_ADMIN_PATH.'/admin.lib.php');
 include_once(G5_SMS5_PATH.'/sms5.lib.php');
 
 if (!strstr($_SERVER['SCRIPT_NAME'], 'install.php')) {
-    if(!mysql_num_rows(mysql_query(" show tables like '{$g5['sms5_config_table']}' ")))
+    if(!sql_num_rows(sql_query(" show tables like '{$g5['sms5_config_table']}' ")))
         goto_url('install.php');
 
     // SMS 설정값 배열변수
diff --git a/adm/sms_admin/install.php b/adm/sms_admin/install.php
index 27e72da67..c7a13441d 100644
--- a/adm/sms_admin/install.php
+++ b/adm/sms_admin/install.php
@@ -53,7 +53,7 @@ eval("\$file = \"$file\";");
 $f = explode(";", $file);
 for ($i=0; $i<count($f); $i++) {
     if (trim($f[$i]) == "") continue;
-    mysql_query($f[$i]) or die(mysql_error());
+    sql_query($f[$i]) or die(mysqli_error());
 }
 // 테이블 생성 ------------------------------------
 
@@ -68,7 +68,7 @@ $download_point = -20;
 //-------------------------------------------------------------------------------------------------
 // config 테이블 설정
 $sql = " insert into {$g5['sms5_book_group_table']} set bg_name='미분류'";
-mysql_query($sql) or die(mysql_error() . "<p>" . $sql);
+sql_query($sql) or die(mysqli_error() . "<p>" . $sql);
 
 echo "<script>document.getElementById('sms5_job_02').innerHTML='DB설정 완료';</script>";
 flush(); usleep(50000);
diff --git a/adm/sms_admin/sms_write.php b/adm/sms_admin/sms_write.php
index c9092bfbd..b63d3dd71 100644
--- a/adm/sms_admin/sms_write.php
+++ b/adm/sms_admin/sms_write.php
@@ -532,7 +532,7 @@ if ($wr_no)
     // 회원목록
     $sql = " select * from {$g5['sms5_history_table']} where wr_no = '$wr_no' and bk_no > 0 ";
     $qry = sql_query($sql);
-    $tot = mysql_num_rows($qry);
+    $tot = sql_num_rows($qry);
 
     if ($tot > 0) {
 
@@ -550,7 +550,7 @@ if ($wr_no)
     // 비회원 목록
     $sql = " select * from {$g5['sms5_history_table']} where wr_no = '$wr_no' and bk_no = 0 ";
     $qry = sql_query($sql);
-    $tot = mysql_num_rows($qry);
+    $tot = sql_num_rows($qry);
 
     if ($tot > 0)
     {
diff --git a/bbs/list.php b/bbs/list.php
index b756bb03c..3fab5acfa 100644
--- a/bbs/list.php
+++ b/bbs/list.php
@@ -53,7 +53,7 @@ if ($sca || $stx) {
     /*
     $sql = " select distinct wr_parent from {$write_table} where {$sql_search} ";
     $result = sql_query($sql);
-    $total_count = mysql_num_rows($result);
+    $total_count = sql_num_rows($result);
     */
 } else {
     $sql_search = "";
diff --git a/bbs/move_update.php b/bbs/move_update.php
index bfaf54bcf..e3919905f 100644
--- a/bbs/move_update.php
+++ b/bbs/move_update.php
@@ -99,7 +99,7 @@ while ($row = sql_fetch_array($result))
                              wr_10 = '".addslashes($row2['wr_10'])."' ";
             sql_query($sql);
 
-            $insert_id = mysql_insert_id();
+            $insert_id = sql_insert_id();
 
             // 코멘트가 아니라면
             if (!$row2['wr_is_comment'])
diff --git a/bbs/qawrite_update.php b/bbs/qawrite_update.php
index 5b5c6c422..a58255b09 100644
--- a/bbs/qawrite_update.php
+++ b/bbs/qawrite_update.php
@@ -244,7 +244,7 @@ if($w == '' || $w == 'a' || $w == 'r') {
     sql_query($sql);
 
     if($w == '' || $w == 'r') {
-        $qa_id = mysql_insert_id();
+        $qa_id = sql_insert_id();
 
         if($w == 'r' && $write['qa_related']) {
             $qa_related = $write['qa_related'];
diff --git a/bbs/scrap_popin_update.php b/bbs/scrap_popin_update.php
index 0a5ff7394..fdc90f9d2 100644
--- a/bbs/scrap_popin_update.php
+++ b/bbs/scrap_popin_update.php
@@ -70,7 +70,7 @@ if ($wr_content && ($member['mb_level'] >= $board['bo_comment_level']))
                          wr_ip = '{$_SERVER['REMOTE_ADDR']}' ";
         sql_query($sql);
 
-        $comment_id = mysql_insert_id();
+        $comment_id = sql_insert_id();
 
         // 원글에 코멘트수 증가
         sql_query(" update $write_table set wr_comment = wr_comment + 1 where wr_id = '$wr_id' ");
diff --git a/bbs/search.php b/bbs/search.php
index 0f3fe803b..b9831eb67 100644
--- a/bbs/search.php
+++ b/bbs/search.php
@@ -120,7 +120,7 @@ if ($stx) {
 
         $sql = " select wr_id from {$tmp_write_table} where {$sql_search} ";
         $result = sql_query($sql, false);
-        $row['cnt'] = @mysql_num_rows($result);
+        $row['cnt'] = @sql_num_rows($result);
 
         $total_count += $row['cnt'];
         if ($row['cnt']) {
diff --git a/bbs/write_comment_update.php b/bbs/write_comment_update.php
index c2fdb67e7..4e93d1556 100644
--- a/bbs/write_comment_update.php
+++ b/bbs/write_comment_update.php
@@ -167,7 +167,7 @@ if ($w == 'c') // 댓글 입력
                      wr_10 = '$wr_10' ";
     sql_query($sql);
 
-    $comment_id = mysql_insert_id();
+    $comment_id = sql_insert_id();
 
     // 원글에 댓글수 증가 & 마지막 시간 반영
     sql_query(" update $write_table set wr_comment = wr_comment + 1, wr_last = '".G5_TIME_YMDHIS."' where wr_id = '$wr_id' ");
diff --git a/bbs/write_update.php b/bbs/write_update.php
index e70f57e6c..5310d2e16 100644
--- a/bbs/write_update.php
+++ b/bbs/write_update.php
@@ -244,7 +244,7 @@ if ($w == '' || $w == 'r') {
                      wr_10 = '$wr_10' ";
     sql_query($sql);
 
-    $wr_id = mysql_insert_id();
+    $wr_id = sql_insert_id();
 
     // 부모 아이디에 UPDATE
     sql_query(" update $write_table set wr_parent = '$wr_id' where wr_id = '$wr_id' ");
diff --git a/common.php b/common.php
index b2b1d1ca7..f46cc542c 100644
--- a/common.php
+++ b/common.php
@@ -135,7 +135,7 @@ if (file_exists($dbconfig_file)) {
     // mysql connect resource $g5 배열에 저장 - 명랑폐인님 제안
     $g5['connect_db'] = $connect_db;
 
-    sql_query(" set names utf8 ");
+    sql_set_charset('utf8', $connect_db);
     if(defined('G5_MYSQL_SET_MODE') && G5_MYSQL_SET_MODE) sql_query("SET SESSION sql_mode = ''");
     if (defined(G5_TIMEZONE)) sql_query(" set time_zone = '".G5_TIMEZONE."'");
 } else {
diff --git a/g4_import_run.php b/g4_import_run.php
index 1d3ea67f4..aa8f8a214 100644
--- a/g4_import_run.php
+++ b/g4_import_run.php
@@ -169,13 +169,7 @@ document.onkeydown = noRefresh ;
             $is_euckr = true;
 
         // member table 복사
-        $columns = array();
-        $fields = mysql_list_fields(G5_MYSQL_DB, $g5['member_table']);
-        $count = mysql_num_fields($fields);
-        for ($i = 0; $i < $count; $i++) {
-            $fld = mysql_field_name($fields, $i);
-            $columns[] = $fld;
-        }
+        $columns = sql_field_names($g5['member_table']);
 
         $sql = " select * from {$g4['member_table']} ";
         $result = sql_query($sql);
@@ -325,13 +319,7 @@ document.onkeydown = noRefresh ;
         echo '<li>visit sum table 복사</li>'.PHP_EOL;
 
         // group table 복사
-        $columns = array();
-        $fields = mysql_list_fields(G5_MYSQL_DB, $g5['group_table']);
-        $count = mysql_num_fields($fields);
-        for ($i = 0; $i < $count; $i++) {
-            $fld = mysql_field_name($fields, $i);
-            $columns[] = $fld;
-        }
+        $columns = sql_field_names($g5['group_table']);
 
         $sql = " select * from {$g4['group_table']} ";
         $result = sql_query($sql);
@@ -365,13 +353,7 @@ document.onkeydown = noRefresh ;
         unset($fiels);
 
         // board 복사
-        $columns = array();
-        $fields = mysql_list_fields(G5_MYSQL_DB, $g5['board_table']);
-        $count = mysql_num_fields($fields);
-        for ($i = 0; $i < $count; $i++) {
-            $fld = mysql_field_name($fields, $i);
-            $columns[] = $fld;
-        }
+        $columns = sql_field_names($g5['board_table']);
 
         $sql = " select * from {$g4['board_table']} ";
         $result = sql_query($sql);
@@ -413,13 +395,7 @@ document.onkeydown = noRefresh ;
             // 게시글 복사
             if(sql_query($sql, FALSE)) {
                 $write_table = $g4['write_prefix'].$bo_table;
-                $columns2 = array();
-                $fields2 = mysql_list_fields(G5_MYSQL_DB, $create_table);
-                $count2 = mysql_num_fields($fields2);
-                for ($j = 0; $j < $count2; $j++) {
-                    $fld = mysql_field_name($fields2, $j);
-                    $columns2[] = $fld;
-                }
+                $columns2 = sql_field_names($create_table);
 
                 $sql3 = " select * from $write_table ";
                 $result3 = sql_query($sql3);
@@ -461,13 +437,7 @@ document.onkeydown = noRefresh ;
         $tables = array('board_file', 'board_new', 'board_good', 'mail', 'memo', 'group_member', 'auth', 'popular', 'poll', 'poll_etc', 'scrap');
 
         foreach($tables as $table) {
-            $columns = array();
-            $fields = mysql_list_fields(G5_MYSQL_DB, $g5[$table.'_table']);
-            $count = mysql_num_fields($fields);
-            for ($i = 0; $i < $count; $i++) {
-                $fld = mysql_field_name($fields, $i);
-                $columns[] = $fld;
-            }
+            $columns = sql_field_names($g5[$table.'_table']);
 
             $src_table = $g4[$table.'_table'];
             $dst_table = $g5[$table.'_table'];
diff --git a/install/install_db.php b/install/install_db.php
index 1a498ea7d..edb532c60 100644
--- a/install/install_db.php
+++ b/install/install_db.php
@@ -8,6 +8,8 @@ header('Cache-Control: pre-check=0, post-check=0, max-age=0'); // HTTP/1.1
 header('Pragma: no-cache'); // HTTP/1.0
 
 include_once ('../config.php');
+include_once ('../lib/common.lib.php');
+
 $title = G5_VERSION." 설치 완료 3/3";
 include_once ('./install.inc.php');
 
@@ -28,7 +30,7 @@ if (isset($_POST['g5_install']))
 $g5_shop_prefix = $_POST['g5_shop_prefix'];
 $g5_shop_install= $_POST['g5_shop_install'];
 
-$dblink = @mysql_connect($mysql_host, $mysql_user, $mysql_pass);
+$dblink = sql_connect($mysql_host, $mysql_user, $mysql_pass, $mysql_db);
 if (!$dblink) {
 ?>
 
@@ -42,7 +44,7 @@ if (!$dblink) {
     exit;
 }
 
-$select_db = @mysql_select_db($mysql_db, $dblink);
+$select_db = sql_select_db($mysql_db, $dblink);
 if (!$select_db) {
 ?>
 
@@ -57,12 +59,14 @@ if (!$select_db) {
 }
 
 $mysql_set_mode = 'false';
-@mysql_query('set names utf8');
-$row = mysql_fetch_assoc(mysql_query(" SELECT @@sql_mode as mode "));
+sql_set_charset('utf8', $dblink);
+$result = sql_query(" SELECT @@sql_mode as mode ", true, $dblink);
+$row = sql_fetch_array($result);
 if($row['mode']) {
-    @mysql_query("SET SESSION sql_mode = ''");
+    sql_query("SET SESSION sql_mode = ''", true, $dblink);
     $mysql_set_mode = 'true';
 }
+unset($result);
 unset($row);
 ?>
 
@@ -72,7 +76,7 @@ unset($row);
     <ol>
 <?php
 $sql = " desc {$table_prefix}config";
-$result = @mysql_query($sql);
+$result = @sql_query($sql, false, $dblink);
 
 // 그누보드5 재설치에 체크하였거나 그누보드5가 설치되어 있지 않다면
 if($g5_install || !$result) {
@@ -85,7 +89,7 @@ if($g5_install || !$result) {
     $f = explode(';', $file);
     for ($i=0; $i<count($f); $i++) {
         if (trim($f[$i]) == '') continue;
-        mysql_query($f[$i]) or die(mysql_error());
+        sql_query($f[$i], true, $dblink);
     }
 }
 
@@ -98,7 +102,7 @@ if($g5_shop_install) {
     $f = explode(';', $file);
     for ($i=0; $i<count($f); $i++) {
         if (trim($f[$i]) == '') continue;
-        mysql_query($f[$i]) or die(mysql_error());
+        sql_query($f[$i], true, $dblink);
     }
 }
 // 테이블 생성 ------------------------------------
@@ -178,14 +182,14 @@ if($g5_install || !$result) {
                     cf_stipulation = '해당 홈페이지에 맞는 회원가입약관을 입력합니다.',
                     cf_privacy = '해당 홈페이지에 맞는 개인정보처리방침을 입력합니다.'
                     ";
-    mysql_query($sql) or die(mysql_error() . "<p>" . $sql);
+    sql_query($sql, true, $dblink);
 
     // 1:1문의 설정
     $sql = " insert into `{$table_prefix}qa_config`
                 ( qa_title, qa_category, qa_skin, qa_mobile_skin, qa_use_email, qa_req_email, qa_use_hp, qa_req_hp, qa_use_editor, qa_subject_len, qa_mobile_subject_len, qa_page_rows, qa_mobile_page_rows, qa_image_width, qa_upload_size, qa_insert_content )
               values
                 ( '1:1문의', '회원|포인트', 'basic', 'basic', '1', '0', '1', '0', '1', '60', '30', '15', '15', '600', '1048576', '' ) ";
-    mysql_query($sql);
+    sql_query($sql, true, $dblink);
 
     // 관리자 회원가입
     $sql = " insert into `{$table_prefix}member`
@@ -201,15 +205,15 @@ if($g5_install || !$result) {
                      mb_datetime = '".G5_TIME_YMDHIS."',
                      mb_ip = '{$_SERVER['REMOTE_ADDR']}'
                      ";
-    @mysql_query($sql);
+    sql_query($sql, true, $dblink);
 
     // 내용관리 생성
-    @mysql_query(" insert into `{$table_prefix}content` set co_id = 'company', co_html = '1', co_subject = '회사소개', co_content= '<p align=center><b>회사소개에 대한 내용을 입력하십시오.</b></p>', co_skin = 'basic', co_mobile_skin = 'basic' ") or die(mysql_error() . "<p>" . $sql);
-    @mysql_query(" insert into `{$table_prefix}content` set co_id = 'privacy', co_html = '1', co_subject = '개인정보 처리방침', co_content= '<p align=center><b>개인정보 처리방침에 대한 내용을 입력하십시오.</b></p>', co_skin = 'basic', co_mobile_skin = 'basic' ") or die(mysql_error() . "<p>" . $sql);
-    @mysql_query(" insert into `{$table_prefix}content` set co_id = 'provision', co_html = '1', co_subject = '서비스 이용약관', co_content= '<p align=center><b>서비스 이용약관에 대한 내용을 입력하십시오.</b></p>', co_skin = 'basic', co_mobile_skin = 'basic' ") or die(mysql_error() . "<p>" . $sql);
+    sql_query(" insert into `{$table_prefix}content` set co_id = 'company', co_html = '1', co_subject = '회사소개', co_content= '<p align=center><b>회사소개에 대한 내용을 입력하십시오.</b></p>', co_skin = 'basic', co_mobile_skin = 'basic' ", true, $dblink);
+    sql_query(" insert into `{$table_prefix}content` set co_id = 'privacy', co_html = '1', co_subject = '개인정보 처리방침', co_content= '<p align=center><b>개인정보 처리방침에 대한 내용을 입력하십시오.</b></p>', co_skin = 'basic', co_mobile_skin = 'basic' ", true, $dblink);
+    sql_query(" insert into `{$table_prefix}content` set co_id = 'provision', co_html = '1', co_subject = '서비스 이용약관', co_content= '<p align=center><b>서비스 이용약관에 대한 내용을 입력하십시오.</b></p>', co_skin = 'basic', co_mobile_skin = 'basic' ", true, $dblink);
 
     // FAQ Master
-    @mysql_query(" insert into `{$table_prefix}faq_master` set fm_id = '1', fm_subject = '자주하시는 질문' ") or die(mysql_error() . "<p>" . $sql);
+    sql_query(" insert into `{$table_prefix}faq_master` set fm_id = '1', fm_subject = '자주하시는 질문' ", true, $dblink);
 }
 
 if($g5_shop_install) {
@@ -347,10 +351,10 @@ if($g5_shop_install) {
                     de_sms_cont4 = '{이름}님 입금 감사합니다.\n{입금액}원\n주문번호:\n{주문번호}\n{회사명}',
                     de_sms_cont5 = '{이름}님 배송합니다.\n택배:{택배회사}\n운송장번호:\n{운송장번호}\n{회사명}'
                     ";
-    mysql_query($sql) or die(mysql_error() . "<p>" . $sql);
+    sql_query($sql, true, $dblink);
 
     // 게시판 그룹 생성
-    @mysql_query(" insert into `{$table_prefix}group` set gr_id = 'shop', gr_subject = '쇼핑몰' ");
+    sql_query(" insert into `{$table_prefix}group` set gr_id = 'shop', gr_subject = '쇼핑몰' ", true, $dblink);
 
     // 게시판 생성
     $tmp_bo_table   = array ("qa", "free", "notice");
@@ -421,7 +425,7 @@ if($g5_shop_install) {
                         bo_use_search       = '0',
                         bo_order            = '0'
                         ";
-        @mysql_query($sql);
+        sql_query($sql, true, $dblink);
 
         // 게시판 테이블 생성
         $file = file("../adm/sql_write.sql");
@@ -433,7 +437,7 @@ if($g5_shop_install) {
         $source = array("/__TABLE_NAME__/", "/;/");
         $target = array($create_table, "");
         $sql = preg_replace($source, $target, $sql);
-        @mysql_query($sql);
+        sql_query($sql, true, $dblink);
     }
 }
 ?>
diff --git a/lib/common.lib.php b/lib/common.lib.php
index 2cee5e9d5..9baeec844 100644
--- a/lib/common.lib.php
+++ b/lib/common.lib.php
@@ -1416,11 +1416,22 @@ function html_symbol($str)
 *************************************************************************/
 
 // DB 연결
-function sql_connect($host, $user, $pass)
+function sql_connect($host, $user, $pass, $db=G5_MYSQL_DB)
 {
     global $g5;
 
-    return @mysql_connect($host, $user, $pass);
+    if(function_exists('mysqli_connect')) {
+        $link = mysqli_connect($host, $user, $pass, $db);
+
+        // 연결 오류 발생 시 스크립트 종료
+        if (mysqli_connect_errno()) {
+            die('Connect Error: '.mysqli_connect_error());
+        }
+    } else {
+        $link = mysql_connect($host, $user, $pass);
+    }
+
+    return $link;
 }
 
 
@@ -1429,16 +1440,36 @@ function sql_select_db($db, $connect)
 {
     global $g5;
 
-    return @mysql_select_db($db, $connect);
+    if(function_exists('mysqli_select_db'))
+        return @mysqli_select_db($connect, $db);
+    else
+        return @mysql_select_db($db, $connect);
 }
 
 
-// mysql_query 와 mysql_error 를 한꺼번에 처리
-// mysql connect resource 지정 - 명랑폐인님 제안
-function sql_query($sql, $error=G5_DISPLAY_SQL_ERROR)
+function sql_set_charset($charset, $link=null)
 {
     global $g5;
 
+    if(!$link)
+        $link = $g5['connect_db'];
+
+    if(function_exists('mysqli_set_charset'))
+        mysqli_set_charset($link, $charset);
+    else
+        sql_query(" set names {$charset} ");
+}
+
+
+// mysqli_query 와 mysqli_error 를 한꺼번에 처리
+// mysql connect resource 지정 - 명랑폐인님 제안
+function sql_query($sql, $error=G5_DISPLAY_SQL_ERROR, $link=null)
+{
+    global $g5;
+
+    if(!$link)
+        $link = $g5['connect_db'];
+
     // Blind SQL Injection 취약점 해결
     $sql = trim($sql);
     // union의 사용을 허락하지 않습니다.
@@ -1447,20 +1478,34 @@ function sql_query($sql, $error=G5_DISPLAY_SQL_ERROR)
     // `information_schema` DB로의 접근을 허락하지 않습니다.
     $sql = preg_replace("#^select.*from.*where.*`?information_schema`?.*#i", "select 1", $sql);
 
-    if ($error)
-        $result = @mysql_query($sql, $g5['connect_db']) or die("<p>$sql<p>" . mysql_errno() . " : " .  mysql_error() . "<p>error file : {$_SERVER['SCRIPT_NAME']}");
-    else
-        $result = @mysql_query($sql, $g5['connect_db']);
+    if(function_exists('mysqli_query')) {
+        if ($error) {
+            $result = @mysqli_query($link, $sql) or die("<p>$sql<p>" . mysqli_errno($link) . " : " .  mysqli_error($link) . "<p>error file : {$_SERVER['SCRIPT_NAME']}");
+        } else {
+            $result = @mysqli_query($link, $sql);
+        }
+    } else {
+        if ($error) {
+            $result = @mysql_query($sql, $link) or die("<p>$sql<p>" . mysql_errno() . " : " .  mysql_error() . "<p>error file : {$_SERVER['SCRIPT_NAME']}");
+        } else {
+            $result = @mysql_query($sql, $link);
+        }
+    }
 
     return $result;
 }
 
 
 // 쿼리를 실행한 후 결과값에서 한행을 얻는다.
-function sql_fetch($sql, $error=G5_DISPLAY_SQL_ERROR)
+function sql_fetch($sql, $error=G5_DISPLAY_SQL_ERROR, $link=null)
 {
-    $result = sql_query($sql, $error);
-    //$row = @sql_fetch_array($result) or die("<p>$sql<p>" . mysql_errno() . " : " .  mysql_error() . "<p>error file : $_SERVER['SCRIPT_NAME']");
+    global $g5;
+
+    if(!$link)
+        $link = $g5['connect_db'];
+
+    $result = sql_query($sql, $error, $link);
+    //$row = @sql_fetch_array($result) or die("<p>$sql<p>" . mysqli_errno() . " : " .  mysqli_error() . "<p>error file : $_SERVER['SCRIPT_NAME']");
     $row = sql_fetch_array($result);
     return $row;
 }
@@ -1469,7 +1514,11 @@ function sql_fetch($sql, $error=G5_DISPLAY_SQL_ERROR)
 // 결과값에서 한행 연관배열(이름으로)로 얻는다.
 function sql_fetch_array($result)
 {
-    $row = @mysql_fetch_assoc($result);
+    if(function_exists('mysqli_fetch_assoc'))
+        $row = @mysqli_fetch_assoc($result);
+    else
+        $row = @mysql_fetch_assoc($result);
+
     return $row;
 }
 
@@ -1479,7 +1528,10 @@ function sql_fetch_array($result)
 // 단, 결과 값은 스크립트(script) 실행부가 종료되면서 메모리에서 자동적으로 지워진다.
 function sql_free_result($result)
 {
-    return mysql_free_result($result);
+    if(function_exists('mysqli_free_result'))
+        return mysqli_free_result($result);
+    else
+        return mysql_free_result($result);
 }
 
 
@@ -1493,6 +1545,59 @@ function sql_password($value)
 }
 
 
+function sql_insert_id($link=null)
+{
+    global $g5;
+
+    if(!$link)
+        $link = $g5['connect_db'];
+
+    if(function_exists('mysqli_insert_id'))
+        return mysqli_insert_id($link);
+    else
+        return mysql_insert_id($link);
+}
+
+
+function sql_num_rows($result)
+{
+    if(function_exists('mysqli_num_rows'))
+        return mysqli_num_rows($result);
+    else
+        return mysql_num_rows($result);
+}
+
+
+function sql_field_names($table, $link=null)
+{
+    global $g5;
+
+    if(!$link)
+        $link = $g5['connect_db'];
+
+    $columns = array();
+
+    $sql = " select * from `$table` limit 1 ";
+    $result = sql_query($sql, $link);
+
+    if(function_exists('mysqli_fetch_field')) {
+        while($field = mysqli_fetch_field($result)) {
+            $columns[] = $field->name;
+        }
+    } else {
+        $i = 0;
+        $cnt = mysql_num_fields($result);
+        while($i < $cnt) {
+            $field = mysql_fetch_field($result, $i);
+            $columns[] = $field->name;
+            $i++;
+        }
+    }
+
+    return $columns;
+}
+
+
 // PHPMyAdmin 참고
 function get_table_define($table, $crlf="\n")
 {
@@ -1893,12 +1998,15 @@ function convert_charset($from_charset, $to_charset, $str)
 }
 
 
-// mysql_real_escape_string 의 alias 기능을 한다.
-function sql_real_escape_string($field)
+// mysqli_real_escape_string 의 alias 기능을 한다.
+function sql_real_escape_string($str, $link=null)
 {
     global $g5;
 
-    return mysql_real_escape_string($field, $g5['connect_db']);
+    if(!$link)
+        $link = $g5['connect_db'];
+
+    return mysqli_real_escape_string($link, $str);
 }
 
 function escape_trim($field)