PHP MYSQL UPDATE如果存在或INSERT如果没有？(PHP MYSQL UPDATE if Exist or INSERT if not?)

 我不知道这是否远程正确。 我有一个类，我想要更新数据库，如果这些字段当前存在或插入，如果他们没有。 复杂的是我正在加入3个表（set_colors，school_art，baseimage） 
 
 任何帮助将是非常好的。 
 
 这是我有的： 
 
public function set_layer_colors($value) {
global $db;

$result_array = mysql_query("
IF EXISTS(SELECT * FROM set_colors WHERE school_art_id = '{$value}')

  UPDATE set_colors (school_art_id, baseimage_id, sub_folder, layer)
    SELECT school_art.id, baseimage.id, baseimage.sub_folder, baseimage.layer
    FROM school_art 
    JOIN baseimage ON baseimage.base_folder = school_art.series_code 
    WHERE baseimage.image_type = 'B' ORDER BY school_art.id 

ELSE

 INSERT INTO set_colors (school_art_id, baseimage_id, sub_folder, layer)
    SELECT school_art.id, baseimage.id, baseimage.sub_folder, baseimage.layer
    FROM school_art 
    JOIN baseimage ON baseimage.base_folder = school_art.series_code 
    WHERE baseimage.image_type = 'B' ORDER BY school_art.id 
    ");

return $result_array;
 
 } 
 
 提前致谢。 

I have no idea if this is even remotely correct. I have a class where I would like to update the database if the fields currently exist or insert if they do not. The complication is that I am doing a joining 3 tables (set_colors, school_art, baseimage) 
 
Any help would be really great.
 
Here is what I have: 
 
public function set_layer_colors($value) {
global $db;

$result_array = mysql_query("
IF EXISTS(SELECT * FROM set_colors WHERE school_art_id = '{$value}')

  UPDATE set_colors (school_art_id, baseimage_id, sub_folder, layer)
    SELECT school_art.id, baseimage.id, baseimage.sub_folder, baseimage.layer
    FROM school_art 
    JOIN baseimage ON baseimage.base_folder = school_art.series_code 
    WHERE baseimage.image_type = 'B' ORDER BY school_art.id 

ELSE

 INSERT INTO set_colors (school_art_id, baseimage_id, sub_folder, layer)
    SELECT school_art.id, baseimage.id, baseimage.sub_folder, baseimage.layer
    FROM school_art 
    JOIN baseimage ON baseimage.base_folder = school_art.series_code 
    WHERE baseimage.image_type = 'B' ORDER BY school_art.id 
    ");

return $result_array;
 
}
 
Thanks in advance.

原文：https://stackoverflow.com/questions/6853190