Hi all. I am busy writing a program, in Microsoft Visual Web Developer, and have a database was several tables. The one I am focusing on now is the ACCOUNT table. This table contains username, password and email column.
I want to compare a username entered into a textbox with the existing usernames in the ACCOUNT table, so that I can create a message saying that the entered user already exists.
I know how to do this in C# with if statements, but am really unsure with SQL, since not sure how to use it with SELECT.Thanks
Hi there, I just want to get some opinions on which tool to use to diagram an ER Picture of a DB model having approx 900 tables, but ....
I have tried a few (Erwin, Aqua Data Studio, Powerdesigner and a few more - even tried Visio). All have problems because I just have the tables - no modelled relations (a pretty bad model but that's the fact). A few PK's almost no FK's. All this is in the code layer or even in the head of the developer only. I want to put all this together to graficaly illustrate our data structure.
What I need to get this job done is
- reverse engineer to have a starting Point (Oracle 11 and MSSQL2008) to have all tables in this tool (on a hidden layer if possible)
- Select some tables and copy them (link) to a new layer to switch visibility depending on the development task that i want to give to a developer
- Display compact (square with table Name, and PKs only). Hide all other columns
- a good way to arrange everything on Screen to avoid crossing Relations and to nicely arrange every table and relation
- toggle visibility of a layer
- a certain table appears on more than one layer depending on the development tasks
- something that makes it all "nice" to present to the Boss.
- crow feet Notation
I more search a documentation type of drawing tool rather than a physical modelling. Some of the tested tools started with creating "alter table add column" scripts that immediately change my DB. This is something I dont need.
Any idea out there?
Any tools avail that accomplish this task?
I am not sure I understand. The % character does not appear in any field names, or table names. The data type of both fields, named "Type" and "SubType" are text, and that text data can contain a % character as part of whatever text the user chooses to enter into the field, along with other special characters.
(I have an application where I prompt the user to enter a text value for the Type and SubType fields, and I save that text into those fields as a new row. The problem I have is that the user can enter a % as part of their user-entered text, and I need to be able to search on text field data for a % character they may have entered; I can put brackets around all other special characters when building my query and they are found fine, but the % just doesn't work for some reason when used in an = query.
I have a question,is it correct
connected data objects consist of connection,command,reader and dataadapter(why we need to DataAdapter in a connected model?),transaction,....
disconnected data objects consist of dataset,dataTable,datarow,dataadapter
so we have two main models connected and disconnected.
what is the rule of DataAdapter in connected model? why do we need to use of a dataadpter to fill a dataset like this in a connected model?
sqlDataAdapter = new SqlDataAdapter(cmdString, sqlConnection);
sqlDataAdapter.SelectCommand = sqlCommand;
sqlDataSet = new DataSet();
int intValue = sqlDataAdapter.Fill(sqlDataSet);
is it right we are shifting of connected model to disconnected model,if yes why?
Last Visit: 31-Dec-99 19:00 Last Update: 2-Mar-15 13:59