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JSP: The Complete Reference
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Four steps involved in basic JDBC operations
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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()
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Database access with JDBC 20 and JNDI
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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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JSP: The Complete Reference
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
A Simple JDBC Example
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:
CREATE TABLE departments ( deptno char(2), deptname char(40), deptmgr char(4) )
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Database Access
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:
JSP IN ACTION SELECT FROM WHERE ORDER BY Ddeptname, Efname, Elname, Etitle, Eemail, Ephone departments D, employees E Ddeptmgr = Eempno Ddeptname
The D and E prefixes are pseudotable names used to qualify column names, so the DBMS can distinguish which table supplies which columns The complete JSP source code is
<%@ page session="false" %> <%@ page import="javasql*" %> <%@ page import="javautil*" %> <HTML> <HEAD> <TITLE>Department Managers</TITLE> </HEAD> <BODY> <img src="images/lyric_notepng" border=0><p> <hr color="#000000"> <H2>Department Managers</H2> <%
JSP: The Complete Reference
String DRIVER = "orgenhydrainstantdbjdbcidbDriver"; String URL = "jdbc:idb:d:/lyricnote/WEB-INF/database/internal/dbprp"; // Open a database connection ClassforName(DRIVER); Connection con = null; try { con = DriverManagergetConnection(URL); // Get department manager information String + " + " + " + " + " ; sql = "" SELECT Ddeptname, Efname, Elname," Etitle, Eemail, Ephone" FROM departments D, employees E" WHERE Ddeptmgr = Eempno" ORDER BY Ddeptname"
Statement stmt = concreateStatement(); ResultSet rs = stmtexecuteQuery(sql); %> <DL> <% while (rsnext()) String dept = String fname = String lname = String title = String email = String phone = { rsgetString(1); rsgetString(2); rsgetString(3); rsgetString(4); rsgetString(5); rsgetString(6);
%> <DT><B><%= dept %></B></DT> <DD> <%= fname %> <%= lname %>, <%= title %><BR> (919) 555-0822 x<%= phone %>, <%= email %> </DD> <% }
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