Question

我将尝试通过帐户创建方法创建一些规则。并查看您的SQL语法错误；检查与您的MariaDB服务器版本相对应的手册以获取正确的语法，以在第1行的“ END”附近使用

string query1 = "IF account.char_count_max > 0 THEN INSERT INTO 
playercharacter(id, connection_ID) VALUES((SELECT id FROM account WHERE 
connection_ID='" + connectionID + "'), (SELECT connection_ID FROM account 
WHERE 
connection_ID='" + connectionID + "')) END";
MySqlCommand cmd = new MySqlCommand(query1, 
MySQL.mySQLsettings.connection);
try
{             
cmd.ExecuteNonQuery();
}
catch (Exception ex)
{
Console.WriteLine(ex.ToString());
throw;
}

Answer 1

SqlCommand.ExecuteNonQuery通常用于直接执行INSERT，UPDATE或DELETE语句，而不是作为IF的一部分。考虑到这一点，我建议您将代码更改为：

if (accountCharCount > 0)
{
    string query1 = "INSERT INTO playercharacter(id, connection_ID) VALUES((SELECT id FROM account WHERE connection_ID='" + connectionID + "'), (SELECT connection_ID FROM account WHERE connection_ID='" + connectionID + "'))";
    using (MySqlCommand cmd = new MySqlCommand(query1, MySQL.mySQLsettings.connection))
    {
        try
        {             
            cmd.ExecuteNonQuery();
        }
        catch (Exception ex)
        {
            Console.WriteLine(ex.ToString());
            throw;
        }
    }
}

因此，您需要先前对数据库的调用才能获取accountCharCount（account.char_count_max）。或者，您可以将所有SQL放入存储过程中，然后使用单个SqlCommand.ExecuteNonQuery调用它。

顺便说一句，您实际上应该对连接ID使用MySqlParameter，而不是文字字符串；这可以保护您免受SQL注入攻击，并且是一个很好的习惯。

“ END”附近的SQL错误语法

1 个答案: