How Can I use Find method in DataSet that has Primary Key make of 3 Columns? dadSample.SelectCommand = New SqlCommand(\"SELECT * FROM StockBalance\", conxMain)
I have read a lot of articles about whether we should have primary keys that are identity columns, but I\'m still confused.
Using sqlite i need a t开发者_如何学JAVAable to hold a blob to store a md5 hash and a 4byte int. I plan to index the int but this value will not be unique.
I have a table defined as follows: CREATE TABLE`mydb`.`users` ( `userID` int(10) unsigned NOT NULL AUTO_INCREMENT,
I\'m experiencing some weird behavior when trying to modify some DataTable objects. Upon the second call to the subrouti开发者_开发知识库ne, I get the following error whenI to copy the source DataTabl
SQL Server provides the type [rowguid]. I like to use this as unique primary key, to identify a row for update. The benefit shows up if you dump the table and reload it, no mess with SerialNo (identit
i wants to trap sql-2000 primary key error into c# and develop my own error like \"this is duplicate Invo开发者_Python百科ice Number\"
I have some mysql tables that have auto incrementing id\'s that are primary keys, but I notice that I never actually use them... I used to think that every table must have a primary key so I guess tha
I\'m writing a simple content management system. I need to store SHA1 hash values that are computed externally as the primary key for my biggest table.
I\'ve been thinking of implementing this system, but can\'t help but feel there\'s a catch somewhere. One of the points of using GUID over incrementing int is that,开发者_开发问答 in the future, if yo
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