Question

我做错了什么？是否有一些C＃翻译麻烦或什么？

string commandText = 
  @"SELECT sc.sc_n,
           sc.provider_n,
           sc.sc_external_id,
           sc.sc_external_name 
      FROM t_supplier_codification sc 
     WHERE sc.product_articul IS NULL 
       AND (sc.sc_external_name != "") 
       AND sc_count >= 1 
       AND provider_n=19 
       AND LENGTH(sc.sc_external_name)>=10 
       AND sc_external_name NOT LIKE '%лента%' 
       AND sc_external_name NOT LIKE '%камера%' 
       AND sc_external_name NOT LIKE '%Replica%' 
       AND sc_external_name NOT LIKE '%ET%' 
       AND sc_external_name LIKE ''
  ORDER BY sc_external_name";

您的SQL语法出错：

查看与您的MySQL服务器版本相对应的手册，以便在“”附近使用正确的语法，并且sc_count＆gt; = 1 AND provider_n = 19 AND LENGTH

Answer 1

您需要使用单引号而不是双引号：

(sc.sc_external_name!='')

双引号终止你的字符串。此外，单引号通常用于SQL中的字符串文字，双引号用于列名（和其他对象）。

Answer 2

当在开头使用@的逐字字符串时，你必须用双qoute分隔双引号。以下是

@"(sc.sc_external_name!="")"

实际上是字符串

(sc.sc_external_name!=")

要解决此问题，您只需添加两个双引号，例如

@"(sc.sc_external_name!="""")"

或者更简单地使用单引号

@"(sc.sc_external_name!='')"

Answer 3

您的双引号会将它们更改为单引号

Answer 4

应删除双引号，试试这个：

        string commandText = @"SELECT sc.sc_n,sc.provider_n,sc.sc_external_id,sc.sc_external_name
                FROM t_supplier_codification sc 
                WHERE sc.product_articul IS NULL 
                AND (sc.sc_external_name!='') AND sc_count >= 1 AND provider_n=19 AND LENGTH(sc.sc_external_name)>=10 AND sc_external_name NOT LIKE '%лента%' 
                AND sc_external_name NOT LIKE '%камера%' AND sc_external_name NOT LIKE '%Replica%' AND sc_external_name NOT LIKE '%ET%' AND sc_external_name LIKE ''
                ORDER BY sc_external_name";

您的SQL语法中有错误

4 个答案: