Question

我试图找到lastday table并导出到另一个文件夹，代码是：

select @lastday := date_sub(curdate(),interval 1 day);
    SET @datanewname = '_m2_raw_Data';
    SELECT @datalasttablename:=concat(@lastday,@datanewname);
    set @path = ' into outfile ''C:\\Db\\test.csv''' ;
    set @field = ' FIELDS TERMINATED BY '',''' ;
    set @enclosed = ' OPTIONALLY ENCLOSED BY ''"''' ;
    set @lines = ' LINES TERMINATED BY ''\\n''';
    set @select = ' select * from';
    select @query:=concat(@select,@datalasttablename,@path,@field,@enclosed,@lines);
    select @query;
    prepare a from @query;

select @query的结果是：

 select * from2017-11-12_m2_raw_Data into outfile 'C:\Db\test.csv'
 FIELDS TERMINATED BY ',' OPTIONALLY ENCLOSED BY '"' LINES TERMINATED
 BY '\n'

但错误随附

错误代码：1064。您的SQL语法有错误;检查与您的MariaDB服务器版本对应的手册第1行0.000秒<@pery'附近使用的语法

Answer 1

此声明无效

prepare a @query;

这就是mysql所期望的

PREPARE stmt_name FROM preparable_stmt

从我所看到的情况来看，你可能想要这样的东西：

PREPARE a FROM @query;

Read more about preparing statements here.

当我尝试准备时，mysql得到错误1064

1 个答案: