php - 如果存在PHP MYSQL UPDATE或不存在INSERT？

我不知道这是否真的正确。我有一个类，如果这些字段当前存在，我想在其中更新数据库，如果不存在则插入。复杂的是，我正在联接3个表(set_colors，school_art，baseimage)

任何帮助都将非常棒。

这是我所拥有的:

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;
}

最佳答案

我相信您正在寻找以下语法

INSERT INTO <table> (field1, field2, field3, ...)
VALUES ('value1', 'value2','value3', ...)
ON DUPLICATE KEY UPDATE
field1='value1', field2='value2', field3='value3', ...