Using a DataSource : Database « JSP « Java
Using a DataSource
<%@page import="java.sql.*, javax.sql.*, javax.naming.*"%>
<html>
<head>
<title>Using a DataSource</title>
</head>
<body>
<h1>Using a DataSource</h1>
<%
DataSource ds = null;
Connection conn = null;
ResultSet result = null;
Statement stmt = null;
ResultSetMetaData rsmd = null;
try{
Context context = new InitialContext();
Context envCtx = (Context) context.lookup("java:comp/env");
ds = (DataSource)envCtx.lookup("jdbc/address");
if (ds != null) {
conn = ds.getConnection();
stmt = conn.createStatement();
result = stmt.executeQuery("SELECT * FROM AddressList");
}
}
catch (SQLException e) {
System.out.println("Error occurred " + e);
}
int columns=0;
try {
rsmd = result.getMetaData();
columns = rsmd.getColumnCount();
}
catch (SQLException e) {
System.out.println("Error occurred " + e);
}
%>
<table width="90%" border="1">
<tr>
<% // write out the header cells containing the column labels
try {
for (int i=1; i<=columns; i++) {
out.write("<th>" + rsmd.getColumnLabel(i) + "</th>");
}
%>
</tr>
<% // now write out one row for each entry in the database table
while (result.next()) {
out.write("<tr>");
for (int i=1; i<=columns; i++) {
out.write("<td>" + result.getString(i) + "</td>");
}
out.write("</tr>");
}
// close the connection, resultset, and the statement
result.close();
stmt.close();
conn.close();
} // end of the try block
catch (SQLException e) {
System.out.println("Error " + e);
}
// ensure everything is closed
finally {
try {
if (stmt != null)
stmt.close();
} catch (SQLException e) {}
try {
if (conn != null)
conn.close();
} catch (SQLException e) {}
}
%>
</table>
</body>
</html>
