Piano Piano che ho fretta Release 1.1.7 (Gente in Movimento) (Italian Edition)

Piano Piano che ho fretta Release (Gente in Movimento) (Italian Edition) eBook: Adriano Moraglio, Marco Boglione, BasicEdizioni: leondumoulin.nl: Kindle.
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Would you like to report poor quality or formatting in this book? Click here Would you like to report this content as inappropriate? The owner wants to be able to look at different coffee pricing scenarios using his laptop, so the application is set up such that it creates a rowset that can be copied to the laptop's disc.

The owner can later fire up the application on his laptop so that he can make updates to the rowset to test out various pricing strategies. The third Bean is a form for displaying and updating ResultSet objects. The application has a graphical user interface that includes buttons for opening and closing the application. These buttons are themselves JavaBeans components that the programmer assembled to make the GUI for his application.

While he is at work, the owner can click on the form's New Data button to get a rowset filled with data. This is the work that requires the rowset to get a connection to the data source, execute its query, get a result set, and populate itself with the result set data. When this work is done, the rowset disconnects itself. The owner can now click on the Close button to save the disconnected rowset to his laptop's disc.

At home or on a plane, the owner can open the application on his laptop and click the button Open to copy the rowset from disc and start making updates using the form. The form displays the rowset, and he simply uses arrow keys or tabs to highlight the piece of data he wants to update. He uses the editing component of the form to type in new values, and the Projector Bean shows the effects of the new values in its bar chart. When he gets back to headquarters, the owner can copy his updated rowset to his office computer if he wants to propagate the updates back to the database.

As part of the implementation, the application programmer will do the following: Create the CachedRowSet Bean and set its properties Register the Projector Bean as a listener to the rowset Create the GUI for the application and implement the actions of the open and close buttons Specify the rowset as a property on the form Bean To put this all together, the application programmer will probably use a visual Bean development tool, which means that he will use very little RowSet API directly.

Of course, the owner will use the application without writing any RowSet code himself.


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The upshot of all of this is that generally tools will generate the RowSet code you see in this tutorial. Also, remember that the code shown here is for illustrative purposes only because it uses the CachedRowSet class, for which there is no implementation currently available. Although the JDBC Standard Extension specification gives a preliminary outline of its functionality, some details in its implementation may be different when it is completed.

The main purpose of this section is to show you when and why you would want to set certain properties. The code for creating a CachedRowSet object simply uses the default constructor. These properties and a RowSet object's event notification capabilities explained in a later section are what make a RowSet object a JavaBeans component. A rowset's properties include its command, concurrency, type, data source name, url, user name, password, transaction isolation level, escape processing, maximum field size, maximum rows, query timeout, and type map.

You are required to set only those properties that are needed for your particular use of a rowset. The following example uses several properties and explains why they are needed. The owner wants the convenience of being able to make updates by scrolling to the rows he wants to update, so the property for the type needs to be set to scrollable.

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It does no harm to set it, however. The default for the concurrency property is ResultSet. The following lines of code make the CachedRowSet object crset scrollable and updatable. The owner can then use the rowset to make his updates. However, he wants to use the preferred means of getting a connection, which is to use a DataSource object, so he will set the properties for the data source name, the owner's user name, and the owner's password.

For security, the programmer may opt to get the user name and password from the owner interactively at run time, in which case he would not need to set them as properties. If you need a refresher on using a DataSource object to make a connection, start reading at page in the advanced tutorial.

Here is the code a tool would generate to set the command string, the data source name, the user name, and the password properties for the CachedRowSet object crset. When the rowset makes a connection, it will use the information in its properties, so the programmer or tool will not need to do anything except execute the command string, which you will see later. Internally the rowset gives the JNDITM naming service the string the programmer set for the data source name property.

The programmer sets one more property, the transaction isolation level, which determines the transaction isolation level given to the connection that the rowset establishes. The following line of code sets the rowset's property so that "dirty reads" will not be allowed. If the owner has the programmer change the command string so that it gets data from a table that has user-defined types with custom mappings, then the type map property will need to be set. In the application we are considering, the Projector Bean needs to be notified when the rowset is updated, so it needs to be registered with the rowset as a listener.

These methods specify what the listener will do when an event occurs on the CachedRowSet object crset. The Projector Bean does not care about where the cursor is, so its implementation of cursorMoved is probably to do nothing. When one or more values in a row changes, the method rowChanged will be called on the listener. This method will probably check to see if the value in the PRICE or SALES columns has changed, and if either has changed, it will plug the appropriate value s into its projection model to get a value to display. The method rowSetChanged is invoked when the contents of the whole rowset change, which happens only when the rowset's command string has been changed and then executed.

This method will probably have an implementation similar to that of the method rowChanged. The following line of code registers projector, the bar chart component, as a listener for crset. The programmer will use his development tool to bring one more component into the application, the editor that will be used to update the rowset. He does this by simply specifying crset as a property on the editor. This tells the editor to which component it should send the changes keyed into it. Now all he has to do in order to get a scrollable and updatable rowset is to call the method execute on the rowset.

As a result of this call, the rowset does all of the following behind the scenes: The difference is that because the application developer has set the properties on the rowset to make it scrollable and updatable, the owner can move the cursor to any position in the rowset and modify its data. This is true even if the ResultSet object from which the rowset got its data is not scrollable or updatable.

In fact, it is especially when a JDBC driver does not support scrollable or updatable result sets that you might want to use a rowset as a means of getting those capabilities.

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The cursor is positioned before the first row in a newly-populated rowset, and a call to the method next moves the cursor to the first row. Thus, to iterate through a rowset from first row to last row, you call the method next in a while loop, just as you would do for a ResultSet object. With scrolling, you can move the cursor in any direction and can go to a row as many times as you like.

If you want a review of how to move the cursor, see the advanced tutorial section "Moving the Cursor in Scrollable Result Sets" on page The owner of The Coffee Break wanted a scrolling rowset so that he could easily make updates to a particular row. The following section illustrates moving the cursor to update a row. The GUI tool displaying the rowset will generate the following line of code to move the cursor to the fifth row. The owner now moves the cursor to the price, which is the third column, and changes the column's value to In response, the GUI tool generates the following update statement.

This causes the GUI tool to generate the following line of code. After it arrives at new projected values for revenue from sales of the affected coffee, it updates the bar chart to reflect the new values.

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Now the owner moves to the previous row, which is the fourth row, changes the price to 9. Note that the fourth column in the rowset contains the number of pounds sold in the last week. The GUI tool generates the following code. If this had been a ResultSet object, both the result set and the database would have been updated with the call to the method updateRow.

However, because this is a disconnected rowset, the method CachedRowSet. The GUI tool will generate the following line of code.


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On the office machine, the rowset can create a connection for writing updated values back to the database. In addition to updating the database with the new values in rows four and five of the rowset, the acceptChanges method will set the values that the rowset keeps as its "original" values. Original values are the values the rowset had just before the current set of updates.

Before writing new values to the database, the rowset's writer component works behind the scenes to compare the rowset's original values with those in the database. If no one has changed values in the table, the rowset's original values and the values in the database should be the same. If there is no conflict, that is, the rowset's original values and the database's values match, the writer may choose to write the updated values to the database, depending on how it is implemented. The current values that the writer enters will be used as the original values when a new set of updates is made.

For example, the price in the fifth row was 9. The rowset's original price of 9. If it does, the writer can update the database price to In this example scenario you have seen how a rowset can be used to pass a set of rows to a thin client, in this case a laptop computer. You have also seen how a rowset can provide scrolling and updatability, which the JDBC driver used at the owner's office does not support. The next part of this chapter will show you how a rowset might be used in an EJB application. The managers can bring up an order form that has two buttons: The developer who designed the form used JavaBeans components to create the buttons, layout, and other components of the form.

The application developer will use Enterprise JavaBeansTM components to make the buttons do their work. The container manages the life cycle of its enterprise Beans and also manages the boundaries of the transactions in which they participate. An EJB application uses the three-tier model. The first tier is the client, which is typically a web browser. In our example, the client is a form running on The Coffee Break's intranet. The third tier is one or more database servers.

L'artigiano della natura: Storia di un venditore diventato capitano d'impresa (Italian Edition)

The method getCoffees is one of the three methods that is implemented by our enterprise Bean, the class CoffeesBean. Let's look at the implementation of this method, which creates and populates a rowset, and then look at how its invocation and execution are spread out over the three tiers. This method will be explained in more detail later in this chapter.

It may have two tiers, a client and server. Also note that a distributed application is different from a distributed transaction. A distributed transaction, often referred to as a global transaction, is a transaction that involves two or more DBMS servers. A global transaction will always occur within the context of a distributed application because by definition it requires at least a client and two servers.

This disconnected rowset is then sent to a thin client. All of this is also true of the rowset in the laptop example, but there are some differences between the two rowsets. The main difference is that the rowset used in the order form for The Coffee Break is not updatable by the client; it is simply a list of coffees and their prices that the manager can look at. Therefore, the rowset does not need its concurrency property set. In fact, the rowset used in the order form does not need any properties at all set. The method getCoffees gets a DataSource object and then uses it to get a connection, so the rowset does not need to perform these tasks.

This means that the rowset does not use a data source name, user name, or password and thus does not need the properties for them set. The order form rowset also needs no command property because the getCoffees implementation executes the query to get coffee names and prices. Recall that by contrast, the rowset in the laptop example created a connection, executed its command string, and populated itself with data by having its execute method invoked. The only CachedRowSet method used in the EJB example is populate, which just reads data from the ResultSet object passed to it and inserts the data into the rowset.

The container controls the life cycle of a Bean, and it also controls the boundaries of distributed transactions. Every enterprise Bean has a transaction attribute to tell the container how it should be managed with regard to distributed transactions.

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If the component that invokes one of the enterprise Bean's methods is already associated with a global transaction, the enterprise Bean method will be associated with that transaction. If not, the container must start a new distributed transaction and execute the enterprise Bean method in the scope of that transaction. When the method has completed, the container will commit the transaction.

The fact that the Bean's container manages the start and end of transactions has implications for the Bean's behavior. First, the Bean should not call the methods commit or rollback. Second, the Bean should not change the default setting for a connection's auto-commit mode. Because the DataSource object is implemented to work with distributed transactions, any connection it produces has its auto-commit mode disabled.

This prevents the connection from automatically committing a transaction, which would get in the way of the container's management of the transaction. Thus, the Bean should leave the connection's auto-commit mode disabled in addition to not calling the methods commit or rollback. Being a session Bean means that it is an extension of the client that creates it, typically reading and updating data in a database on behalf of the client. A session Bean is created when a client begins its session and is closed when the client ends its session.

Being stateless means that the Bean does not need to retain any information it might get from a client from one method invocation to the next. Therefore, any Bean instance can be used for any client. For example, the enterprise Bean we will use has three methods. One creates a CoffeesBean object, another one retrieves a table of coffees and prices, and a third places a manager's order.

It is stateless because it does not have to remember coffee prices or what the client ordered. The enterprise Bean developer writes the first three, and anyone, including the enterprise Bean developer, may supply the fourth. The sections following this one show the code for each interface or class. The container generates an implemention of this interface that delegates to the class CoffeesBean. CoffeesBean, supplied by the developer, actually defines what the methods do.

It is the third item in this list. It declares the method create and creates Coffees objects. The container implements this interface so that the method create delegates its work to the method ejbCreate, which is implemented by the CoffeesBean class. In our example this class is CoffeesBean, which implements the methods ejbCreate, getCoffees, and placeOrder. This class typically includes GUI components. For our example, if it were fully implemented, the CoffeesClient class would include buttons for invoking the methods getCoffees and placeOrder.

It would also include a text editor for typing in the parameters for the method placeOrder. This class could have many different implementations, with or without GUI components, and it could be written by the enterprise Bean developer or anyone else. Now let's look at some sample code for an EJB application. Note that we kept this example very simple in order to concentrate on the basic concepts. In other words, this interface contains the methods that a remote client can invoke. It imports four packages because it uses elements from each one. The following code defines the interface Coffees.

It declares only the single method create, which creates Coffees objects, thus making CoffeesHome the simplest possible form of the home interface. The method create may throw a RemoteException, from the java. These interfaces contain the methods that will be called by the client class. The two methods in Coffees are called in response to button clicks from a manager.

The client calls the CoffesHome. Once the client has a Coffees object, it can call the methods Coffees. The methods invoked by a CoffeesClient object are implemented in the class CoffeesBean, which you will see next. Note that it implements the SessionBean interface, but because it is a stateless SessionBean object, the implementations of the methods ejbRemove, ejbPassivate, and ejbActivate are empty. These methods apply to a SessionBean object with conversational state, but not to a stateless SessionBean object such as an instance of CoffeesBean.

We will examine the code more closely after you have looked at it. This work is done once when the Bean is created to avoid doing it over and over each time the methods getCoffees and placeOrder are called. Defining the method getCoffees. We will break this method down into smaller units for examination. It uses the DataSource object that the method ejbCreate obtained from the JNDI naming service to create a connection to the database that ds represents. Supplying a user name and password to the method DataSource. The code then creates a Statement object and uses it to execute a query.

This is the data that the client has requested. This code assumes that the class CachedRowSet has been defined and that it provides the method populate, which reads data from a ResultSet object and inserts it into a RowSet object. Now let's look at the rest of the implementation of the getCoffees method. Otherwise, getCoffees returns null. There are two points to be made about these lines of code. First, it contains a finally block that assures that even if there is an exception thrown, if the connection is not null, it will be closed and thereby recycled. Because the EJB server and JDBC driver being used implement connection pooling, a valid connection will automatically be put back into the pool of available connections when it is closed.

The second point is that the code does not enable the auto-commit mode, nor does it call the methods commit or rollback. The reason is that this enterprise Bean is operating within the scope of a distributed transaction, so the container will commit or rollback all transactions.

For example, the manager might have typed "Colombian", 50, and "" in the blanks on his form. The server would get the following line of code: As with the method getCoffees, the placeOrders method has a finally block to make sure that a valid connection is closed even if there is an exception thrown. This means that if the connection is valid, it will be returned to the connection pool to be reused. The rest of the implementation deals with methods inherited from the SessionBean interface. Because CoffeesBean is a stateless SessionBean object, the implementations for these methods are empty.

You can create tables, update tables, retrieve and process data from result sets, use prepared statements and stored procedures, and use transactions. You can also use the more advanced functionality, including SQL3 data types, batch updates, programmatic updates, custom mapping, making a connection with a DataSource object, connection pooling, distributed transactions, and rowsets. The reference chapters give more examples and more in-depth explanations of the features you have learned to use in these tutorials. Remember to take advantage of the glossary and the index as aids for getting information quickly.

About the Author Maydene Fisher has extensive experience as a technical writer specializing in the documentation of object-oriented programming languages. Reader Feedback Tell us what you think of this Book excerpt. Very worth reading Worth reading Not worth reading If you have other comments or ideas for future articles, please type them here: In una foresta un orso sta rincorrendo un coniglio, e mentre sta per agguantarlo salta fuori una rana che urla: Io sono una rana magica e ho deciso di dare a voi due la possibilita' di esaudire tre desideri ciascuno!

L'orso lascia andare il coniglio, ci pensa su per un attimo e dice: E il coniglio di rimando: L'orso si mette a ridere per la stupidita' del coniglio: Ed ora il secondo desiderio". L'orso, sempre piu' arrapato: E l'orso giu' a ridere per come il coniglio stia specando i suoi desideri. Il coniglio mette il casco, sale sulla moto, accende il motore, ingrana la prima ed urla: Una bambina sta preparando il discorso della sua comunione, quando, sentendo rumori nell'altra stanza, nota che il padre sta facendo l'amore con la cameriera.

La bambina corre dalla madre e le dice: Originally posted by [. It is based on the work of the FreeTDS project but it's an independent project for over one year now. The current version, jTDS 0. For more information about these, try our links page. Just place it in your classpath or change your classpath to include that of jtds. What's more important is the class name of the driver and data source implementations and the URL format.

The class names are for the moment, they are going to change pretty soon, to match the project's web address com. The URL format is: For more information about the properties and other questions, check out the Frequently Asked Questions. Ho visto un binario morto che aspettava di essere sepolto Ho visto un cartello per la strada con scritto: That damned microsoft jdbc driver Welcome Avion!

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I installed it, setted the classpath and ran my webapp. When I try to access a resultset picking up data in a different order than the selection query order, I obtain an error: I tried to add ResultSet. Can you help me to set up this driver or the microsoft one? That damned microsoft jdbc driver Author: That damned microsoft jdbc driver set The DB server wil be faster on sorting than your application anyway.

Avion In Reply To: I need to get the column values in a certain order, often more than once in the same jsp page. I could use variables, but I might manually modify tens of pages I don't have the time and the will: That's how the JDBC driver works. Each piece of information can only be read once. If you need to access that data more than once you need to store it in your own data structures e. That message indicates that you haven't registered the jTDS driver correctly or that you specified an invalid protocol in the URL But I doubt that the free driver implements all features such as scrollable result sets.

You could use the cached rowset implementation which is available at Sun's Early Access site Thomas Re: I'll give it a shot if I can't resolve these problems, I'll simply tell our customer to stop whining and buy merant's jdbc driver: Ace In Reply To: It does not support updatable ResultSets. Brian In Reply To: By continuing to use this site, you certify that you have read and agree to abide by Sun's "Terms Of Use" which are linked to this site at the bottom of the page.

Any users of this site who state that they work for Sun Microsystems, Inc. All information, data, text, software, music, sound, photographs, graphics, video, messages, or other materials "Content" posted to this site by any users are the sole responsibility of those users. Sun does not guarantee the accuracy, integrity, or quality of such Content. Posting a name in a discussion forum places that personal information into a public forum.

Cause, effetti e possibili soluzioni Sintomo: Piedi freddi e umidi. Piedi caldi e umidi. Ti sei pisciato addosso. Sei caduto con la faccia sul portacenere. Ripulisci tutto e risciacquati la bocca con un buon gin-tonic. Il suolo si sta muovendo. Chiedi dove ti stanno portando. Riflesso multiplo di teste che ti guardano fisso da uno specchio d'acqua.

Sei chino sul water, e stai cercando di vomitare. Infilati le dita in gola. La gente produce un eco misterioso quando parla. Ti stai mettendo il bicchiere del cocktail all'orecchio. Piantala di fare il pagliaccio. Non muoverti, possibile coma etilico. Una luce enorme della discoteca ti sta accecando.

Am I correct in thinking its jdbc: I will try to create some documentation for jTDS, but that won't be soon. The most important properties the ones I use are 'user', 'password', 'charset' and 'TDS'. The last one specifies the TDS version to be used: Maybe this will change in the future. So, if you want to use SQL Server 7. Connection 1 failed to be returned in time.

Connection 0 failed to be returned in time. I will try to add this question and its complete answer to the FAQ page, which is currently empty. Anyway, it looks like your URL seems to be quite ok although it's not very clear to me what that doublequote is doing there before password. Probably your problem is that you did not add the jTDS jar to your classpath. Check this and let me know if it's still not working. If I'm around, I'll most probably answer in less than half an hour.

You can actually see the code that does the URL parsing at the following address: It would help a lot having an actual example that doesn't work. Thanks a lot, Alin. Al fine di facilitarne l'utilizzo, sono state sviluppate le seguenti procedure che vi invitiamo a leggere attentamente, facendo riferimento a quella che piu si adatta al vostro caso es.

Avvicinarsi con l'autovettura al bancomat. Inserire la carta nel bancomat e digitare il PIN. Ritirare la carta, il contante e la ricevuta. Fare retromarcia fino ad allineare il finestrino al bancomat. Riavviare il motore che nel frattempo si e spento. Trovare la borsetta e svuotare tutto il contenuto sul sedile passeggeri per trovare la carta. Localizzare la trousse e controllare il trucco sullo specchietto retrovisore. Provare ad inserire la carta nel bancomat. Aprire lo sportello per facilitare l'accesso al bancomat a causa dell'eccessiva distanza dell'automobile. Reinserire la carta nel verso giusto.

Risvuotare la borsetta per cercare l'agenda con il PIN scritto sul retro della pagina di copertina. Premere Cancel e digitare il PIN corretto. Ricontrollare il trucco nello specchietto retrovisore. Ritirare il contante e la ricevuta. Svuotare ancora la borsetta per trovare il portafogli e riporci il contante. Riporre la ricevuta insieme al blocchetto degli assegni. Ricontrollare il trucco ancora una volta.

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Ripartire e percorrere 2 metri. Fare retromarcia fino al bancomat. Risvuotare la borsetta, trovare il portafogli e collocare la carta nell'apposito comparto. Guidare per 5 o 6 chilometri. Togliere il freno a mano. Scrolling Cursor Types 9. Locking and concurrency control Copyright and Support 1 Changes 1. Now it returns the ODBC 3 datatypes. Only one character was returned. You need to use " A syntax error is occured. The method deleted the wrong row or the error "The requested row is not in the fetch buffer. Incorrect syntax near '? The value ever was null.

The problem was that the driver hangs when the program tried to load the driver classes with: TdsDriver" ; or Class. Timestamp" and not "java. Before it could happen that no data were returned from sp with parameters no return data, no ResultSet. This bug can occur when a callable statement with one or more output parameters is executed multiple times. This large string was sent erroneously in the sql7 mode. This bug can also occur when a string larger than characters was used in the Where clause of a SQL statement.

CLOB and "Unknown output datatype: This is fixed now. This execption could occur with large results in specific cases. This means that the statements are now precompiled on the SQL Server. Because of this bug the following exception could occur: A PreparedStatement that initially had been executed with a BigDecimal with small scale and then was reexecuted with a larger scale truncated the scale to the value of the first execution. This bug was fixed.

NULL and images, text, ntext and uniqueidentifer data types was fixed. You need a browser compatible with JDK 1. Most browsers support JDK 1. A solution is to use the Java Plugin. If -Change Network Support- is selected, than cancel the setup. Enter the port number and the proxy address if nesessary and click OK. However servers can be configured to listen on any port number. To make sure that the RDBMS server is listening on the machine name and port number you specified use: These are - SQL Server authentication - Windows NT authentication - Mixed or both authentications Our driver is completley written in Java and therefore platform independent type 4 driver , that is why it can't read the current NT session account and thus can only connect with a SQL Server login.

If you want to employ the i-net driver you need to enable "SQL Server authentication" or "Mixed authentication". To verify the authentication type: With both subprotocols you can read all data types. If you want save both data types together then you can use 2 connections. If the value is true then the method setTransactionIsolation will call setAutoCommit false implicitly and start a transaction. Named Pipes Another solution to connect to the sql server are named pipes. Named pipes are working only in the Java VM 1.

Named pipes are equal to files with a UNC path. We have tested named pipes only with the Win32 VM from Sun. If you want to use named pipes from another platform you will need to install SMB server message block on the client or you will need to install NFS network file system on the sql server. Escape Clauses The driver implements the following escape clauses: Character Converting By default character converting is disabled. The property charset is case-sensitive in JAVA. The name of the character set is also case-sensitive.