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The JDBC interface is contained in the javasql and javaxsql packages3 It consists mainly of interfaces rather than concrete classes because each vendor s implementation is specific to their particular database protocol The core API in javasql consists of 16 interfaces, 8 classes, and 4 exception types The Optional Package API adds another 12 interfaces and 2 classes Many of these classes are of interest primarily to JDBC driver developers A smaller subset of these is more commonly used, as outlined in the following: I Connection An active link to a database through which a Java program can read and write data, as well as explore the database structure and capabilities

javaxsql contains the JDBC 20 Optional Package API, formerly known as the JDBC 20 Standard Extension API

Figure 13-1

A Connection object is created either by a call to DriverManagerget Connection() or DataSourcegetConnection(), in JDBC 20 I Statement An object that allows SQL statements to be sent through a connection and retrieves the result sets and update counts they produce Three types of statements exist, each one a specialization of its predecessors: I Statement Used to execute static SQL strings A Statement is created with ConnectioncreateStatement()

13:

Figure 13-2

I PreparedStatement An extension of Statement that uses precompiled SQL, possibly with dynamically set input parameters PreparedStatement objects are often used in a loop with SQL insert operations They are created with ConnectionprepareStatement(sqlstring) I CallableStatement A PreparedStatement that invokes a stored procedure Not all database management systems support stored procedures but, for those that do, CallableStatement provides a standard invocation syntax

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Public Class AddExample Public Shared Function whereCondition(ByVal p As Role) As Boolean Return p.ID = 1 End Function Sub Listing2_11() Dim people = New PeopleDataContext() Dim predicateDelegate As New Func(Of Role, Boolean)(AddressOf whereCondition)

I ResultSet An ordered set of table rows produced by an SQL query or a call to certain metadata functions A ResultSet is most often encountered as the return value of a StatementexecuteQuery(sqlstring) method call The JDBC API provides a next() method for iterating through the rows of a ResultSet and getXXX() methods for extracting the column values, where XXX is the Java data type JDBC 20 adds a number of methods for randomly accessing and updating rows I DatabaseMetaData An interface containing numerous methods that provide information about the structure and capabilities of a database The DatabaseMetaData object is returned by the getMetaData() method of a Connection object I ResultSetMetaData An interface that describes the columns of a ResultSet This can be obtained by calling the result set s getMetaData() method It contains methods that describe the number of columns, as well as each column s name, display size, data type, and class name I DriverManager An interface that registers JDBC drivers and supplies connections that can handle specific JDBC URLs The only method commonly used is the static DriverManagergetConnection(), in one of its three forms, which returns an active Connection object bound to the specified JDBC URL I SQLException The base exception class used by the JDBC API SQLException has methods that can supply the SQLState value any vendor-specific error code It can also be linked to another SQLException if more than one exception occurred One of the stated goals of the JDBC API was it should be simple and easy to master Learning these seven classes and three or four of their main methods can easily be done in a few days, which has helped to make JDBC a popular and well-accepted technology

Let s consider an example of JDBC used in a JSP page Our hypothetical LyricNote company maintains an internal employee database containing two tables: departments and employees These tables were created with the following SQL:

Figure 9-11

CREATE TABLE departments ( deptno char(2), deptname char(40), deptmgr char(4) )

13:

CREATE TABLE employees ( deptno char(2), empno char(4), lname char(20), fname char(20), hiredate date, ismgr bit, deptno char(2), title char(50), email char(32), phone char(4) )

Our example JSP page displays a list of departments identifying their manager s name, title, telephone number, and e-mail address The SQL to assemble this list is as follows:

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