📄 queryiterate.jsp
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<%@ taglib prefix="sql" uri="http://java.sun.com/jsp/jstl/sql" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<html>
<head>
<title>JSTL: SQL action examples</title>
</head>
<body bgcolor="#FFFFFF">
<h1>SQL Query Execution using an iterator</h1>
<!-- NOTE: the sql:setDataSource tag is for prototyping and simple applications. You should really use a DataSource object instead --!>
<sql:setDataSource
var="example"
driver="${sessionScope.myDbDriver}"
url="${sessionScope.myDbUrl}"
user="${sessionScope.myDbUserName}"
password="${sessionScope.myDbPassword}"
/>
<sql:transaction dataSource="${example}">
<sql:update var="newTable">
create table mytable (
nameid int primary key,
name varchar(80)
)
</sql:update>
<sql:update var="updateCount">
INSERT INTO mytable VALUES (1,'Paul Oakenfold')
</sql:update>
<sql:update var="updateCount">
INSERT INTO mytable VALUES (2,'Timo Maas')
</sql:update>
<sql:update var="updateCount">
INSERT INTO mytable VALUES (3,'Paul van Dyk')
</sql:update>
<sql:query var="deejays">
SELECT * FROM mytable
</sql:query>
</sql:transaction>
<hr>
<h2>Iterating over each Row of the result</h2>
<table border="1">
<c:forEach var="row" items="${deejays.rowsByIndex}">
<tr>
<c:forEach var="column" items="${row}">
<td><c:out value="${column}"/></td>
</c:forEach>
</tr>
</c:forEach>
</table>
<hr>
<h2>Iterating over Columns without knowing the index</h2>
<table border="1">
<c:forEach var="row" items="${deejays.rows}">
<tr>
<td>Name: <c:out value="${row.NAMEID}"/></td>
<td>Value: <c:out value="${row.NAME}"/></td>
</tr>
</c:forEach>
</table>
<hr>
<h2>Putting it all together</h2>
<%-- Easiest example showing how to populate a table --%>
<table border="1">
<tr>
<%-- Get the column names for the header of the table --%>
<c:forEach var="columnName" items="${deejays.columnNames}">
<th><c:out value="${columnName}"/></th>
</c:forEach>
<%-- Get the value of each column while iterating over rows --%>
<c:forEach var="row" items="${deejays.rowsByIndex}">
<tr>
<c:forEach var="column" items="${row}">
<td><c:out value="${column}"/></td>
</c:forEach>
</c:forEach>
</table>
<sql:update var="newTable" dataSource="${example}">
drop table mytable
</sql:update>
</body>
</html>
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