<sql:param value="${paramartist_id}"/> </sql:query> in Java

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<sql:param value="${paramartist_id}"/> </sql:query>
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<h2>Albums by <c:out escapeXml="false" value="${paramname}"/></h2>
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<ul> <c:forEach items="${cdsrows}" var="cd"> <li><a href="<c:url value="show_tracksjsp"> <c:param name="cd_id" value="${cdcd_id}"/> <c:param name="name" value="${cdname}"/> </c:url>"><c:out value="${cdname}"/></a>
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</c:forEach> </ul>
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The sql:query tag here looks very similar to the one in Listing 63; both specify a dataSource, var, and sql to run In this example, however, the sql has a question mark where the artist_id passed in from the previous page might be expected Correspondingly, the sql:query tag has a body containing a sql:param tag, whose value is the very artist_id that was needed This is another feature of the sql:query tag Before the query is run, question marks within the sql parameter may be filled in with values from sql:param tags in the body Because the values of sql:param come from scripts, queries can be dynamically altered as needed After the sql:query, the rest of the page is straightforward Another c:forEach iterates all the CDs and provides a link to see the tracks on another page
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64 Inserting Data from JSPs
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To make the little CD application more useful, it can be expanded to allow the user to add new artists, CDs, and tracks Not surprisingly, the standard tag library provides another tag to facilitate this: sql:update Before jumping into seeing how this tag is used, it is worthwhile to step back and consider what will need to be done in order to add a new artist First, the user will specify the name in a form, which will be sent to another JSP, which will use the new tag to perform an insert It would be reasonable to expect that we will use a sql:param in order to pass the name to the query This is all straightforward enough However, it is important to keep in mind that the artist table has not only a name but also an artist_id Where will this ID come from One possibility would be to force the user to provide it along with the name But this is far from satisfactory; this ID is used only internally by the system to track data and has no intrinsic meaning to the user Hence the user should never see it In addition, there is no clear way in which the user would know what value to use It therefore seems that the system should keep track of IDs That is perfectly fine, as such information can easily be added to the database It is merely necessary to create another table of IDs, which will be called sequence, as it will provide sequences of ID values Its definition is simple:
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create table sequence ( name char (60), id int)
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insert into sequence values('artist',0); insert into sequence values('album',0); insert into sequence values('track',0);
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With this table in place, creating a new artist would take the following steps: 1 Use a select to find the current ID where name is artist 2 Use an update to increment that ID, so the next artist created will get a new number 3 Use the obtained ID in an insert to create the artist There is in fact a further complication If two users try to add an artist at the same time, they might both get the same ID in step 1 before either can get to step 2 to update the current ID Most modern databases have a way to prevent this, and it is supported by the tag library through the jsp:transaction tag, which is beyond the scope of the book Listing 65 shows everything that must be done in a JSP in order to add an artist to the database with a proper ID Listing 65 Using a JSP to add data to a database
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<%@ taglib prefix="sql" uri="http://javasuncom/jstl/sql" %>
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<sql:query dataSource="jdbc:hsqldb:jspbook,orghsqldbjdbcDriver,sa" sql="select value from sequence where name='Artist'" var="ids"/>
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<sql:update dataSource="jdbc:hsqldb:jspbook,orghsqldbjdbcDriver,sa" sql="insert into artist(artist_id,name) values( , )"> <sql:param value="${idsrows[0]id}"/> <sql:param value="${paramname}"/> </sql:update>
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<sql:update dataSource="jdbc:hsqldb:jspbook,orghsqldbjdbcDriver,sa" sql="update sequence set value= where name='Artist'"> <sql:param value="${idsrows[0]id + 1}"/> </sql:update>
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