autonumber

问题 I have a Customer table, an Order table, an Orderline table and a Product table. All of them have an Autonumber field as their primary key, and Orderline has a foreign key reference to Order ID on Order table: ORDER ----- Order ID - Autonumber Customer ID - Number ... ORDERLINE --------- OrderLine ID - Autonumber Order ID - FK to Order Product ID - FK to Product Quantity PRODUCT ------- Product ID - Autonumber Product details... I have a form where I can choose a customer, and then a list of

问题 As the title suggests, is there any way of turning off an autonumber field in Access to allow me to insert a row with an id of my choosing, such as you would do with SET IDENTITY_INSERT OFF in SQL Server? 回答1: You can insert an ID with SQL. INSERT INTO Table1 (ID) Values (-10) 回答2: The autonumber property sets a field's default value as the autonumber seed value. If the autonumber field is also the primary key (or has a separate unique constraint), you can't re-use any of the stored values.

问题 I have an access database. In this I have a table which had an auto number field that created the ids. I somehow deleted these ids in the table. Now that I have deleted these records, I need a same sequence to continue (I want the deleted ids back in the table), but I am not able to do so because the auto number feature deleted the ids forever. I tried changing the field datatype to just number and entering the ids manually, but it won't change because the database gives me a warning saying

问题 I have a Database which is migrated from MSSQL to PostgreSQL(9.2) . This Database have 100+ tables, These table have autonumbering filed(PRIMARY KEY field), given below is an example for a table CREATE TABLE company ( companyid integer NOT NULL DEFAULT nextval('seq_company_id'::regclass), company character varying(100), add1 character varying(100), add2 character varying(100), add3 character varying(100), phoneoff character varying(30), phoneres character varying(30) CONSTRAINT gcompany_pkey

问题 When user press [Return] key then need to display the number. Like serial numbers [1,2 etc] for each line.Is there any way to do that? Following code I tried func textView(_ textView: UITextView, shouldChangeTextIn range: NSRange, replacementText text: String) -> Bool { var textview_text_nssring = textView.text as NSString // Add "1" when the user starts typing into the text field if (range.location == 0 && textView.text.isEmpty ) { if text == "\n" { textView.text = "1." let cursor =

问题 The code is below. in my code I updating existing row(from existing table) that the program get all the updated values from textBoxes. there is at the end(the last column)of the table autoNumber field which is named as "codonsAutoNum" I don't know how to get the value (autonumber value) from the databese. I need the value in the position (in the code) where there is '??'. thank you all for your help! the code: private void update_Click(object sender, EventArgs e) { string connectionString =

问题 I'm trying the following: CREATE TABLE Table1 ( RecordNo autonumber, --error here! PersonId varchar(50), ... ) But, there is an error. How can I build the correct query in Access? 回答1: According to SQL Auto Increment a Field: CREATE TABLE Persons ( P_Id PRIMARY KEY AUTOINCREMENT, LastName varchar(255) NOT NULL, FirstName varchar(255), Address varchar(255), City varchar(255) ) The MS Access uses the AUTOINCREMENT keyword to perform an auto-increment feature. By default, the starting value for

问题 I have been searching for a solution to this autonumber problem that I am having. There seems to be no definite answer anywhere. I have a form which has a text field. I want this form to display the next number from a field in a table. Example: the table contains 3 records with the values D001, D002, D003 The form is used to enter new records (new data). So next time I enter data I want D004 to automatically show up on the text field for data code in the form. How can this be done? 回答1: You

问题 I am writing a small C# society membership app using Visual Studio 2008, and the new data layer with .Net 3.5, along with SQLite. I used the various wizards to generate my main form, which has a BindingNavigator and a BindingSource on it. The idea is that the form shows 1 record, and you can update the record, and use the BindingNavigator controls to navigate to the other records, add records, delete records, etc. I would like the current record to be written back to the database whenever the

问题 Found the following trigger in a database which was blocking inserts on a unique varchar primary key CREATE OR REPLACE TRIGGER "BI_PRIVILEGE" before insert on "PRIVILEGE" for each row begin if :NEW."PRIVILEGE-ID" is null then select "PRIVILEGE_SEQ".nextval into :NEW."PRIVILEGE-ID" from dual; end if; end; Is this an auto-number generator? I can easily disable it to fix my problem, but will there be unforseen negative ramifcations for the primary key? I have actually been looking for code to