Question

无论我尝试使用我的DDL，我都会“解析查询时出错”。

所以我需要一个SQL的SQL-Server-CE风格的专家来告诉我以下哪个是首选方法（或者很可能是其他方法）。请注意，我并不担心这些字符串格式元素的“SQL注入”：

1）

string ddl = string.Format("ALTER TABLE {0} ADD salvationID nvarchar(19)", tablename);
ddl = string.Format("UPDATE {0} SET redemptionID = ''", tablename);

2）

string ddl = string.Format("ALTER TABLE {0} ADD salvationID nvarchar(19) NOT NULL", tablename);
ddl = string.Format("UPDATE {0} SET redemptionID = ''", tablename);
//explicitly supplying the empty string

3）

string ddl = string.Format("ALTER TABLE {0} ADD salvationID nvarchar(19) NOT NULL", tablename);
//assuming the empty string is supplied automatically

4）

string ddl = string.Format("ALTER TABLE {0} ADD salvationID nvarchar(19) NOT NULL WITH DEFAULT", tablename);
//assuming it automatically provides an empty string val

5）

string ddl = string.Format("ALTER TABLE {0} ADD salvationID nvarchar(19) NOT NULL WITH DEFAULT ''", tablename);
//specifying the default val explicitly - an empty string

6）

string ddl = string.Format("ALTER TABLE {0} ADD salvationID nvarchar(19) NOT NULL WITH DEFAULT {1}", tablename, string.empty);
//specifying the default val explicitly - an empty string via a string format element

7）

string ddl = string.Format("ALTER TABLE {0} ADD salvationID nvarchar(19) NOT NULL DEFAULT ''", tablename);
//omitting the "WITH" keyword and specifying the default val explicitly - an empty string

8）

string ddl = string.Format("ALTER TABLE {0} ADD salvationID nvarchar(19) NOT NULL DEFAULT {1}", tablename, string.empty);
//omitting the "WITH" keyword and specifying the default val explicitly - an empty string via a string format element

Answer 1

ALTER TABLE [{0}] ADD [salvationID] nvarchar(19) NOT NULL DEFAULT ''

http://msdn.microsoft.com/en-us/library/ms174123.aspx

SQL Server CE的DDL解析器非常挑剔但却对其发现错误的内容保密

1 个答案: