By Dianne Cook, Deborah F. Swayne
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Extra info for Interactive and Dynamic Graphics for Data Analysis [electronic resource]: With R and Ggobi
4 The DBI Package One of the most popular databases used with R is MySQL (http://mysql. com). This freely available database runs on a variety of platforms and is relatively easy to conﬁgure and operate. In the following sections, we’ll look at the RMySQL package as an example of using the DBI package. 5 Accessing a MySQL Database The ﬁrst step in accessing a MySQL database is loading the MySQL package. This package will automatically load the required DBI package, which provides a common interface across diﬀerent databases.
7228044 Naturally, the help page for the function that produced the object, as well as additional help pages describing the class (if available), can be consulted for additional information. Although there is no generic print function for S4 classes, the generic show function takes its place for printing or displaying S4 classes. The actual entities that compose an S4 object are stored in so-called slots. To see the available slots in an object, the showClass function can be used. If it becomes necessary to access the slots directly, the @ operator can be used in a fashion similar to the $ operator.
1" > close(rpage) The second argument to readLines speciﬁes the number of lines to read, where a value of -1 means to read everything that the connection provides. Although it may seem ineﬃcient to read only one line at a time, the actual reads are being performed by the operating system and are buﬀered in memory, so that you can choose whatever number of lines is most convenient. By using this technique, we only need to process as much of the connection as necessary. table, and cat. table function takes care of opening and closing the gzipped ﬁle, since it was not explicitly opened.