How can i write jstl with jsp in sql:update ,when it give sqlException"
<%@ taglib prefix="c" uri="http://java.sun.com/jstl/core_rt"%>
<%@ taglib prefix="sql" uri="http://java.sun.com/jstl/sql_rt"%>
<%@ taglib prefix="fmt" uri="http://java.sun.com/jstl/fmt" %>
<sql:query var="login" dataSource="jdbc:mysql://localhost/user,com.mysql.jdbc.Driver,user,parul">
SELECT * FROM login;
</sql:query>
<html>
<head>
<title>login information</title>
</head>
<body>
<h1>login information</h1>
<table border="1">
<tr>
<th>id</th>
<th>login</th>
<th colspan="2">password</th>
</tr>
<c:forEach var="round" items="${login.rows}" >
<tr>
<td>${round.id}</td>
<td>${round.login}</td>
<td colspan="2">${round.password}</td>
</tr>
</c:forEach><tr>
<form name="round-input" action="round_process.jsp" method="POST">
<td><input name="id" type="text" size="20" /></td>
<td><input name="login" type="text" size="20" /></td>
<td><input name="password" type="text" size="20" /></td>
<td><input type="submit" value="Update" /></td>
</form>
</tr>
</table>
</body>
</html>
it pass the parameter in round_process.jsp
<!--
<%@ taglib prefix="c" uri="http://java.sun.com/jstl/core_rt" %>
<%@ taglib prefix="sql" uri="http://java.sun.com/jstl/sql_rt" %>
<%@ taglib prefix="fmt" uri="http://java.sun.com/jstl/fmt_rt" %>
-->
<sql:query var="login" dataSource="jdbc:mysql://localhost/user,com.mysql.jdbc.Driver,user,parul">
SELECT * FROM login WHERE id=?
<sql:param value="${param.id}"/>
</sql:query>
<sql:update>
INSERT INTO login(id,login,password)VALUES(?,?,?)
<sql:param value="${param.id}"/>
<sql:param value="${param.login}"/>
<sql:param value="${param.password}"/>
</sql:update>
<c:redirect url="round-input.jsp"/>
when i execute the second .jsp page it will show an exception and error that is
javax.servlet.ServletException: Unable to get connection, DataSource invalid: "null"
org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:825)
org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:758)
org.apache.jsp.round_005fprocess_jsp._jspService(round_005fprocess_jsp.java:87)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
root cause
javax.servlet.jsp.JspException: Unable to get connection, DataSource invalid: "null"
org.apache.taglibs.standard.tag.common.sql.UpdateTagSupport.getConnection(UpdateTagSupport.java:234)
org.apache.taglibs.standard.tag.common.sql.UpdateTagSupport.doStartTag(UpdateTagSupport.java:115)
org.apache.jsp.round_005fprocess_jsp._jspx_meth_sql_update_0(round_005fprocess_jsp.java:168)
org.apache.jsp.round_005fprocess_jsp._jspService(round_005fprocess_jsp.java:71)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
note The full stack trace of the root cause is available in the Apache Tomcat/5.0.28 logs.
Your problem is that you need to have a
<sql:setDataSource
var="myDataSource"
dataSource="jdbc:mysql://localhost/user,com.mysql.jdbc.Driver,user,parul"
/>and your sql:query would now be
<sql:query var="login" dataSource="${myDataSource}">
SELECT * FROM login;
</sql:query>You can use whatever name you want for the var in the setDataSource as long as it matches the dataSource in the query.
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* Created on 2004-12-23
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