Visual C# 2010 Express Edition For Absolute Beginners

Getting started with SQLite in C Tigrans Blog. This tutorial will teach you how to create and connect to an SQLite database in C. P4XVpC7aI4w/hqdefault.jpg' alt='Visual C# 2010 Express Edition For Absolute Beginners' title='Visual C# 2010 Express Edition For Absolute Beginners' />Visual C 2010 Express Edition For Absolute Beginners GuitarKilauea Mount Etna Mount Yasur Mount Nyiragongo and Nyamuragira Piton de la Fournaise Erta Ale. Noregistration upload of files up to 250MB. Not available in some countries. Introduction To EMicro Forex Futures Investopedia www. While there is no central marketplace for. MSDN Magazine Issues and Downloads. Read the magazine online, download a formatted digital version of each issue, or grab sample code and apps. This article describes how LZW data compression works, gives a little bit of background on where it came from, and provides some working C code so you can experiment. A blog educating the illinformed about all the positive experiences and amazing solutions built on Lotus Notes. Visual C 2010 Express Edition For Absolute Beginners TrailerYou will also learn how to create and modify tables and how to execute SQL queries on the database and how to read the returned results. Ill assume that youre already familiar with SQL and at least have some knowledge of how it works for example what to expect as a result from select from table. There will probably be two parts, with the first one discussing the basics needed to do pretty much anything, and in the second part Ill discuss some miscellaneous subjects like how to parameterize your queries to make them much faster and safer. Lets get started. Create a standard C console project. Since were working in C well be using the System. Simocode Software. Data. SQLite library. This library is not a standard library packaged with. Visual C# 2010 Express Edition For Absolute Beginners' title='Visual C# 2010 Express Edition For Absolute Beginners' />NET for example so well need to download it. It is being developed by the people whore also working on the original SQLite. All youll need are two files, a. These files are available for download at the end of this article, you can also download these from their website, but youll also get some files that you dont need. Put these files in the folder of your project and add an assembly reference to the. Just browse to System. Data. SQLite. dll and select it. Now add using System. Data. SQLite to the usings and youre done. Youve successfully added the SQLite library to you projectCreating a database file You usually dont need to create a new database file, you work with an existing one, but for those cases where you do need to create a brand new one, heres the code SQLite. Connection. Create. FileMy. Database. Connecting to a database Before you can use the database, youll need to connect to it. This connection is stored inside a connection object. Every time you interact with the database, youll need to provide the connection object. Therefore, well declare the connection object as a member variable. SQLite. Connection mdb. Connection When creating a connection, well need to provide a connection string this string can contain information about the connection. Things like the filename of the database, the version, but can also contain things like a password, if its required. You can find a few of these at http www. The first one is good enough to get our connection up and running, so we get mdb. Fx 2012 V4 Rapidshare'>Fx 2012 V4 Rapidshare. Connection. new SQLite. ConnectionData SourceMy. Database. sqlite Version3. Connection. Open After we create the connection object, well have to open it. And with every Open there comes a Close, so dont forget to call that after youre done with your connection. Creating a table Lets write some SQL now. Well create a table with two columns, the first one contains names and the second one contains scores. See it as a high scores table. You could also spam caps if you like and get something like this string sql CREATE TABLE highscores name VARCHAR2. INT Now well need to create an SQL command in order to execute it. Luckily, weve got the SQLite. Command class for this. We create a command by entering the sql query along with the connection object. SQLite. Command command new SQLite. Commandsql, mdb. Connection Afterwards, we execute the command. But before we execute our command, id like to mention that not all commands are the same, some commands return results like SELECT etc. Thats why there are two execute methods actually, there are three One returns the actual results the rows of the table the other returns an integer indicating the number of rows that have been modified. Well use the last one now. Execute. Non. Query At this time, were not interested in the number of rows that have been modified its 0 But you could imagine that it might be interesting to know this information in UPDATE queries. Filling our table Lets fill our table with some values, so we can do some SELECT queries. Lets create a new command. Well see later that this process can be made a bit easier and faster with command parameters. Me, 9. 00. 1 We create and execute the command the same way as we created the table. I added two more rows or records to the table. Heres the code string sql insert into highscores name, score values Me, 3. Civil War Sharps Carbine Serial Numbers. SQLite. Command command new SQLite. Commandsql, mdb. Connection. Execute. Non. Query. Myself, 6. 00. 0. SQLite. Commandsql, mdb. Connection. command. Execute. Non. Query. And I, 9. 00. 1. SQLite. Commandsql, mdb. Connection. Execute. Non. Query As you can see, this is three times pretty much the same piece code. But it works Getting the high scores out of our database Lets query the database for the high scores sorted on score in descending order. Our SQL query becomes select from highscores order by score descWe create a command in the regular fashion string sql select from highscores order by score desc. SQLite. Command command new SQLite. Commandsql, mdb. Connection However, we execute this command using a different method, well use the Execute. Reader method which returns an SQLite. Data. Reader object. Well use this object to read the results of the query. SQLite. Data. Reader reader command. Execute. Reader With this reader you can read the result row by row. Heres some code that iterates trough all the rows and writes them to the console string sql  select from highscores order by score desc. SQLite. Command command  new SQLite. Commandsql, mdb. Connection. SQLite. Data. Reader reader  command. Execute. Reader. Read. Console. Write. LineName   readername  t. Score   readerscore The Read method of the reader moves the reader to the next row. With the operators, you can read the value of a certain column. The value returned is of the type object. So youll usually need to cast it before you can use it. Fortunately, you usually know what this type is. Well, thats about it for this tutorial. You should now be able to do pretty much anything you want with your database. Click here to download the project files that implement what weve discussed in this article. The above link also contains the libraries. If youd like to have only the library, click the link below The version of the library provided here is the. NET 4. 0 x. 86 version. This should work fine for anyone working in Visual Studio 2. If it doesnt work, download the correct version from their website mentiond at the beginning of this articleDownload only the libraries.