sql语法错误创建触发器

Question

我想创建触发器，我已编写此查询，但这不执行。 请检查我的查询

CREATE
    TRIGGER 'blog_after_insert' AFTER INSERT 
    ON 'blog' 
    FOR EACH ROW BEGIN

        IF NEW.deleted THEN
            SET @changetype = 'DELETE';
        ELSE
            SET @changetype = 'NEW';
        END IF;

        INSERT INTO audit (blog_id, changetype) VALUES (NEW.id, @changetype);

我收到了这个错误

#1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ''blog_after_insert' AFTER INSERT 
    ON 'blog' 
    FOR EACH ROW BEGIN

        IF NEW.del' at line 2 

Answer 1

请运行此查询

DELIMITER $$
CREATE
    TRIGGER blog_after_insert  AFTER INSERT 
    ON blog 
    FOR EACH ROW BEGIN

        IF NEW.deleted THEN
            SET @changetype = "DELETE";
        ELSE
            SET @changetype = "NEW";
        END IF;

        INSERT INTO audit (blog_id, changetype) VALUES (NEW.id, @changetype);

    END$$
DELIMITER ;

Answer 2

单引号（ ' ）表示字符串文字 - 对象名称，如触发器和表应该使用正向引号，或者根本没有引号：

CREATE
    TRIGGER blog_after_insert AFTER INSERT -- here
    ON blog -- and here
    FOR EACH ROW BEGIN
    -- rest of code...