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To execute a PreparedStatement, you can use one of the following three methods: public boolean execute()throws SQLException public ResultSet executeQuery()throws SQLException public int executeUpdate()throws SQLException The logic of when to use each method is the same as that for the methods with the same names in the Statement interface discussed in the section The Statement Interface. Notice, however, that unlike their counterparts in Statement interface, these methods don t take a SQL string. This is because the SQL statement itself has already been precompiled at the time you invoke the prepareStatement() method of the Connection object. It s time for some examples that illustrate all of the steps just described. Let s first look at an example that queries data.

Tablespace encryption depends on the transparent data encryption feature of the Oracle database, which requires you to create and maintain a secure credentials repository called an Oracle Wallet to store the master encryption key for the database.

Note As a rule of thumb, if your desired accuracy is in microseconds, chances are that you will not be

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Let s briefly look at the two basic methods of configuring physical disks. Although you may never have to do this yourself, it s a good idea to have a basic understanding of how disks are managed by system administrators. You can configure disks as whole disks or as logical volumes. Whole disks are exactly what their name implies: each physical disk is taken as a whole, and a single file system is created on each disk. You can neither extend nor shrink the file system at a later stage. Logical volumes, on the other hand, are created by combining several hard disks or disk partitions. System administrators usually employ the sophisticated LVM to combine physical disks. A set of physical disks is combined into a volume group, which is then sliced up by the LVM into smaller logical volumes. Most modern systems use the LVM approach because it is an extremely flexible and easy way to manage disk space. For example, it s no problem at all to add space and modify partitions on a running system by using the LVM tool. Once you create logical volumes, you can designate disk volumes as mount points, and individual files can then be created on these mount points.

A redundant array of inexpensive (sometimes also referred to as independent) disk (RAID) device is a popular way to configure large logical (or virtual) disks from a set of smaller disks The idea is simply to combine several small, inexpensive disks into an array in order to gain higher performance and data security This allows you to replace one very expensive large disk with several much cheaper small disks Data is broken up into equal-sized chunks (called the stripe size), usually 32KB or 64KB, and a chunk is written on each disk, the exact distribution of data being determined by the RAID level adopted When the data is read back, the process is reversed, giving the appearance that one large disk, instead of several small disks, is being used.

The class DemoPreparedStatementQuery described in this section illustrates how to use the PreparedStatement interface in JDBC programs to select data from a database. It illustrates binding by parameter index and binding by parameter name. After the necessary imports, we have the main() method of the class: /* This program demonstrates how to query data from a table * using the PreparedStatement interface. It illustrates * binding a parameter both by index and by name. * COMPATIBLITY NOTE: runs successfully against 10.1.0.2.0. * against 9.2.0.1.0, you have to comment out the * code using the binding by name feature to compile and * run this, as bind by name is not supported in 9i. */ import java.sql.ResultSet; import java.sql.SQLException; import java.sql.PreparedStatement; import java.sql.Connection; import oracle.jdbc.OraclePreparedStatement; import book.util.JDBCUtil; import book.ch03.Util; class DemoPreparedStatementQuery {

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