如何在文本框中顯示「腳本表作爲創建查詢」的結果以及數據類型的長度？

Question

我可以在列表框中顯示選定表名的「腳本表作爲創建查詢」的結果。

的SelectedIndexChanged列表框的：

QueryOfSelectedTableName.Text = CREATE TABLE TableName (Id int NOT NULL, Name nvarchar NOT NULL, SurName nvarchar NOT NULL, Adress nvarchar NOT NULL) 

但我需要表的數據類型的lenght這樣的：

QueryOfSelectedTableName.Text= CREATE TABLE TableName (Id int NOT NULL, Name nvarchar(50) NOT NULL, SurName nvarchar(50) NOT NULL, Adress nvarchar(50) NOT NULL) 

我如何能做到這一點的代碼

 private void ListBoxTableNames_SelectedIndexChanged(object sender, EventArgs e) 

     { 
     string table = ListBoxTableNames.SelectedItem.ToString(); 


     using (SqlConnection con = new SqlConnection(strConnectDB1)) 
     { 
      con.Open(); 


      using (SqlCommand comQuery = new SqlCommand(@"declare @vsSQL varchar(8000) 
       declare @vsTableName varchar(50) 
       select @vsTableName = @TT 
       select @vsSQL = 'CREATE TABLE ' + @vsTableName + char(10) + '(' + char(10) 
       select @vsSQL = @vsSQL + ' ' + sc.Name + ' ' + 
       st.Name + 
       case when st.Name in ('varchar','varchar','char','nchar') then '(' + 
       cast(sc.Length as varchar) + ') ' else ' ' end + 
       case when sc.IsNullable = 1 then 'NULL' else 'NOT NULL' end + ',' + char(10) 
       from sysobjects so 
       join syscolumns sc on sc.id = so.id 
       join systypes st on st.xusertype = sc.xusertype 
       where so.name = @vsTableName 
       order by 
       sc.ColID 
       select substring(@vsSQL,1,len(@vsSQL) - 2) + char(10) + ')'", con)) 
      { 

       comQuery.Parameters.AddWithValue("@TT", ListBoxTableNames.SelectedItem); 


       using (SqlDataReader readerQuery = comQuery.ExecuteReader()) 
       { 

        QueryOfSelectedTableName.Text=""; 

        while (readerQuery.Read()) 
        { 
         QueryOfSelectedTableName.Text = readerQuery[0].ToString(); 


        } 

       } 


      } 
     } 

    } 

結果這個 ？

Answer 1

你缺少爲nvarchar您的列表：

您的代碼：

case when st.Name in ('varchar','varchar','char','nchar')