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Jstl 操作數據庫相關

工作要找。。東西還是要學的。。。

Code:
JSTL SQL Query

<%@?taglib?uri="http://java.sun.com/jstl/core"?prefix="c"?%>
<%@?taglib?uri="http://java.sun.com/jstl/sql"?prefix="sql"?%>

<sql:setDataSource?var="dataSource"?driver="org.gjt.mm.mysql.Driver"
url="jdbc:mysql://localhost/forum?user=forumuser"
scope="session"?/>

<html>
??<head>
????<title>Query?Example</title>
??</head>

??<body>

<sql:query?var?=?"users"?dataSource="${dataSource}">
select?column_uid,column_pwd,column_accesses,column_first,column_last,column_bad,column_posted,column_type?from?t_users
</sql:query>

<table?border=1>
<c:forEach?var="row"?items="${users.rows}">
<tr>
<td><c:out?value="${row.column_uid}"/></td>
<td><c:out?value="${row.column_pwd}"/></td>
<td><c:out?value="${row.column_accesses}"/></td>
<td><c:out?value="${row.column_first}"/></td>
<td><c:out?value="${row.column_last}"/></td>
<td><c:out?value="${row.column_bad}"/></td>
<td><c:out?value="${row.column_posted}"/></td>
<td><c:out?value="${row.column_type}"/></td>
</tr>
</c:forEach>
</table>

??</body>
</html>

JSTL SQL Update

<%@?taglib?uri="http://java.sun.com/jstl/core"?prefix="c"?%>
<%@?taglib?uri="http://java.sun.com/jstl/core-rt"?prefix="c-rt"?%>
<%@?taglib?uri="http://java.sun.com/jstl/sql"?prefix="sql"?%>

<sql:setDataSource?var="dataSource"?driver="org.gjt.mm.mysql.Driver"
url="jdbc:mysql://localhost/forum?user=forumuser"
scope="session"?/>

<html>
??<head>
????<title>General?Query</title>
??</head>

??<body>
??<c:choose>
????<c:when?test="${param.cmd!=null}">
??????<c:set?var="str"?value="${param.cmd}"?/>
????</c:when>

????<c:otherwise>
??????<c:set?var="str"
??????value="select?*?from?tableName"?/>
????</c:otherwise>
??</c:choose>

??Please?enter?a?query:
??<br?/>

??<form?method="post">
????<textarea?name="cmd"?cols="40"?rows="5">
<c:out?value="${str}"?/>
????</textarea>

????<br?/>

????<input?type="submit"?/>
??</form>

??<c:if?test="${pageContext.request.method=='POST'}">
????<c:catch?var="e">
??????<sql:query?var="users"?dataSource="${dataSource}"
??????sql="${param.cmd}"?/>

??????<table?border="1">
????????<c:forEach?var="row"?items="${users.rows}"
????????varStatus="status">
??????????<jsp:useBean?id="status"
??????????type="javax.servlet.jsp.jstl.core.LoopTagStatus"?/>

??????????<c-rt:if?test="<%=status.getCount()==1%>">
????????????<tr>
??????????????<c:forEach?var="col"?items="${row}">
????????????????<th>
??????????????????<c:out?value="${col.key}"?/>
????????????????</th>
??????????????</c:forEach>
????????????</tr>
??????????</c-rt:if>

??????????<tr>
????????????<c:forEach?var="col"?items="${row}">
??????????????<td>
????????????????<c:out?value="${col.value}"?/>
??????????????</td>
????????????</c:forEach>
??????????</tr>
????????</c:forEach>
??????</table>
????</c:catch>

????<c:if?test="${e!=null}">
??????<h3>Error</h3>

??????<c:out?value="${e}"?/>
????</c:if>
??</c:if>
??</body>
</html>

Updating a database using the sql:update tag

//web.xml

<?xml?version="1.0"?encoding="UTF-8"?>
<!DOCTYPE?web-app?PUBLIC?"-//Sun?Microsystems,?Inc.//DTD?Web?Application?2.3//EN"
??"http://java.sun.com/dtd/web-app_2_3.dtd">
<web-app>
??<resource-ref>
????<res-ref-name>jdbc/address</res-ref-name>
????<res-type>javax.sql.DataSource</res-type>
????<res-auth>Container</res-auth>
??</resource-ref>
</web-app>

<%@?taglib?prefix="sql"?uri="http://java.sun.com/jstl/sql"?%>
<%@?taglib?prefix="c"?uri="http://java.sun.com/jstl/core"?%>
<html>
<head>
<title>Updating?a?database?using?the?sql:update?tag</title>
<sql:setDataSource
??var="conn"
??dataSource="jdbc/address"
/>
</head>
<body>
<h1>Modify?Address?List</h1>
<sql:update?dataSource="${conn}"?var="addresses">
????INSERT?INTO?AddressList?(name,?street,?city,?country,?telephone)?VALUES?(?,??,??,??,??)
????<sql:param?value='${param["name"]}'/>
????<sql:param?value='${param["street"]}'/>
????<sql:param?value='${param["city"]}'/>
????<sql:param?value='${param["country"]}'/>
????<sql:param?value='${param["tel"]}'/>
</sql:update>
</body>
</html>

Presenting database content using tags

//web.xml
<?xml?version="1.0"?encoding="UTF-8"?>
<!DOCTYPE?web-app?PUBLIC?"-//Sun?Microsystems,?Inc.//DTD?Web?Application?2.3//EN"
??"http://java.sun.com/dtd/web-app_2_3.dtd">
<web-app>
??<resource-ref>
????<res-ref-name>jdbc/address</res-ref-name>
????<res-type>javax.sql.DataSource</res-type>
????<res-auth>Container</res-auth>
??</resource-ref>
</web-app>

<%@?taglib?prefix="sql"?uri="http://java.sun.com/jstl/sql"?%>
<%@?taglib?prefix="c"?uri="http://java.sun.com/jstl/core"?%>
<html>
<head>
<title>Presenting?database?content?using?tags</title>
<sql:setDataSource
??dataSource="jdbc/address"
??var="conn"
/>
</head>
<body>

<h1>Address?List</h1>
<sql:query?dataSource="${conn}"?var="addresses">
????SELECT?*?FROM?AddressList
</sql:query>
<table?width="90%"?border="1">
<tr>

<c:forEach?var="columnName"?items="${addresses.columnNames}">
??<th>?<c:out?value="${columnName}"/>?</th>
</c:forEach>
</tr>

<c:forEach?var="row"?items="${addresses.rowsByIndex}">
??<tr>
????<c:forEach?var="column"?items="${row}">
??????<td><c:out?value="${column}"/></td>
????</c:forEach>
??</tr>
</c:forEach>
</table>
</body>
</html>

JSTL: Transaction with a JSP

<%@?taglib?uri="http://java.sun.com/jstl/core"?prefix="c"?%>
<%@?taglib?uri="http://java.sun.com/jstl/sql"?prefix="sql"?%>
<html>
<HEAD>
??????<TITLE>Using?a?Transaction?with?a?JSP</TITLE>
?????</HEAD>
<body?bgcolor="white">
??????????<h2>View?table?Data</h2>
<sql:transaction>??
??<sql:update>
??insert?into?atable?values(2,?'Joe','Id','Feb-24-1996','F')
??</sql:update>
????<sql:query?var="resultObj">
????select?*?from?atable
????</sql:query>

</sql:transaction>??
<table>
<c:forEach?items="${resultObj.rows}"?var="row">
??<c:forEach?items="${row}"?var="column">
????<tr>
???<td?align="right">
?????<b><c:out?value="${column.key}"?/></b>
?????</td>
?????<td>
???????<c:out?value="${column.value}"?/>
?????</td></tr>
?????</c:forEach>
???????</c:forEach>
?????</table>
</body>
</html>

SQL Tag Out Examples

<%@?taglib?uri="http://java.sun.com/jstl/core"?prefix="c"?%>
<%@?taglib?uri="http://java.sun.com/jstl/sql"?prefix="sql"?%>

<sql:setDataSource?var="dataSource"?driver="sun.jdbc.odbc.JdbcOdbcDriver"?url="jdbc:odbc:forum"/>

<html>
??<head>
????<title>SQL?Tag?Out?Examples</title>
??</head>

??<body>

<sql:query?var?=?"users"?dataSource="${dataSource}">
select?column_uid,column_pwd,column_accesses,column_first,column_last,column_bad,column_posted,column_type?from?t_users
</sql:query>

<table?border=1>
<c:forEach?var="row"?items="${users.rows}">
<tr>
<td><c:out?value="${row.column_uid}"/></td>
<td><c:out?value="${row.column_pwd}"/></td>
<td><c:out?value="${row.column_accesses}"/></td>
<td><c:out?value="${row.column_first}"/></td>
<td><c:out?value="${row.column_last}"/></td>
<td><c:out?value="${row.column_bad}"/></td>
<td><c:out?value="${row.column_posted}"/></td>
<td><c:out?value="${row.column_type}"/></td>
</tr>
</c:forEach>
</table>

??</body>
</html>

詳細請看:http://www.java2s.com

posted on 2006-06-15 19:27 record java and net 閱讀(1342) 評論(0) 編輯收藏所屬分類: Jsp&&Web

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