Visual Basic Sql Code Example
IntroductionSQL Transactions are magical little creatures. Before you think that you are reading a fantasy novel, I'll stop; but really, SQL Transactions are quite powerful. With today's article, I will explain what SQL Transactions are and how to use them properly in your Visual Basic applications. A Quick Beginner's Guide to SQLStructured Query Language is the programming language you use to build databases, extract information from databases, and store information into databases. In an earlier article I spoke about the term database, so if you haven't read it yet,. If this is your first time hearing the term SQL,. To extract any information from any database, we need to write an SQL query.
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A query can be explained as a request for information that it then presents ultimately. Now, as I have mentioned, all database information gets stored inside tables. These tables contain all the information that has been stored. We must write a query to get this information and present it to the user. QueriesThe simplest form of a query would look like this: SELECT. FROM TableNameThis will give you all the data stored in that particular table. Remember now, that some tables can have millions of records inside them, so, in this case, this simple query can give you all the millions of records.
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Usually, this is not really needed. Usually, there is some sort of condition involved when extracting information. A query with a condition will look like the following: SELECT. FROM TableName WHERE Field = ValueA query similar to the above now has the capability to return only certain information. Let me use a bank as an example. With any bank, they deal with millions of customers. Many of these customers may have the same last names, or even the exact same names.
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Any customer of the bank may have more than one type of account. Now, taking all of this into consideration, a query to return all the information to a specific person may be troublesome. If conditions did not exist, this would have caused you stand in the banking queue for a very long time while the poor teller sifts through all the information just to find the correct person with the correct information.We can take conditions further, and write a query like the following: SELECT. FROM TableName WHERE Field1 = Value1AND Field2 Value2 OR Field3 Value2OR Table3.Field3.
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