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From t.@hockeyresource.com
Subject [Patch:new] Oracle auto. increment impl. for Modual Database Action
Date Thu, 08 Jul 2004 16:18:12 GMT
My first contribution, please review!
regards,

TC
=============== OraIncrementModule.java
package org.apache.cocoon.components.modules.database;

import java.lang.Integer;
import java.sql.PreparedStatement;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.Statement;
import java.sql.SQLException;
import java.util.Map;
import org.apache.avalon.framework.configuration.*;
import org.apache.avalon.framework.thread.ThreadSafe;
import org.apache.cocoon.components.modules.database.*;
import org.apache.avalon.framework.logger.AbstractLogEnabled;

/**
 * This is an impl. on behalf of an ORACLE sequence defined in your schema
for getting an automatic incremental ID.
 * A total of 2 queries will be sent to the DB.
 *<ol>
 * <li>The 1st one is for getting a snapshot of the latest sequence id,
which will be availabe in the sitemap for other usage.</li>
 * <li>The 2nd one is for inserting record(s) into the target table.</li>
 * </ol>
 * NOTE:: If the sequence-id is NOT needed in sitemap, please use
<i>org.apache.cocoon.components.modules.database.OraShortIncrementModule</i>
to save the effort of the first query.
 *<P/>
 * In cocoon.xconf, one could declare such an auto module as:
 *<pre>
 *    <autoincrement-modules>
 *      <component-instance
class="org.apache.cocoon.components.modules.database.OraIncrementModule"
logger="steLog" name="auto-ora"/>
 *</pre>
 * In the mdb configuartion file definition,
 *<pre>
 *   <table ...> ...
 *   ...
 *      <key ...>
 *         <mode name="auto-ora" type="autoincr"
 *               sequence="u're-sequence-name" reqAttr="seqid-in-sitemap" />
 *</pre>
 * where mode/@sequence is u're Oracle sequence name and <br>
 * mode/@reqAttr is the name of a req. attribute containing a value of the
sequence which is also available in sitemap via
{request-attr:seqid-in-sitemap}.
 **/
public class OraSeqIncrementModule extends AbstractAutoIncrementModule
    implements ThreadSafe {

    /**
     * @return: true, key value is needed in the final query.
     **/
    public boolean includeInQuery() {
	return true;
    }

    /**
     * @return true: key appears as a value; 2 queries will be sent to the
DB.
     **/
    public boolean includeAsValue() {
	return true;
    }

    /**
     * a query for getting the NEXTVAL out of a sequence.
     * Such a NEXTVAL value will be set as a String into a request
attribute, whose name=<mod>/@reqAttr. Therefore, such a sequence
number is available in the sitemap thru
{request-attr:<value-of-your-@reqAttr-defined-in-mdb-file>}
     **/
    public Object getPreValue( Configuration tableConf, Configuration
columnConf, Configuration modeConf, Connection conn, Map objectModel )
throws SQLException, ConfigurationException {
	String sequence = modeConf.getAttribute("sequence", null);
	if( null==sequence )
	    throw new ConfigurationException("ERROR!!! Please define your
sequence name in mdb file, under
table[name="+tableConf.getAttribute("name")+"]/key[@name="+columnConf.getAttribute("name")+"]/mode/@sequence"
);
	String reqAttr = modeConf.getAttribute("reqAttr", null);
	PreparedStatement pstmt= conn.prepareStatement( "select
"+sequence+".NEXTVAL AS nextid from dual" );
	ResultSet rs= pstmt.executeQuery();
	rs.next();
	Integer nextid= new Integer(rs.getInt("nextid"));
	pstmt.close();
        if (getLogger().isDebugEnabled())
            getLogger().debug("ORA sequence:"+sequence+".NextVal= "+nextid );
	if( null!=reqAttr )
	    org.apache.cocoon.environment.ObjectModelHelper.getRequest(objectModel).setAttribute(reqAttr,
nextid.toString() );
        return nextid;
    }

    public Object getPostValue( Configuration tableConf, Configuration
columnConf, Configuration modeConf, Connection conn, Statement stmt,
Map objectModel )  throws SQLException, ConfigurationException {
	return null;
    }

    public String getSubquery( Configuration tableConf, Configuration
columnConf, Configuration modeConf)
        throws ConfigurationException {
        return null;
    }

}


================= OraShortIncrementModule.java
package org.apache.cocoon.components.modules.database;

import java.lang.Integer;
import java.sql.PreparedStatement;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.Statement;
import java.sql.SQLException;
import java.util.Map;
import org.apache.avalon.framework.configuration.*;
import org.apache.avalon.framework.thread.ThreadSafe;
import org.apache.cocoon.components.modules.database.*;
import org.apache.avalon.framework.logger.AbstractLogEnabled;

/**
 * This is an impl. on behalf of an ORACLE sequence defined in your schema
for getting an automatic incremental ID.
 * Only one insert query will be sent to the DB-table with a snapshot
value out of a sequence.
 * NOTE:: If the sequence-id is needed in sitemap, please use
<i>org.apache.cocoon.components.modules.database.OraIncrementModule</i>;
which costs U one more query for getting the sequence and make it
available to the sitemap as a request attributre.
 *<P/>
 * In cocoon.xconf, one could declare such an auto module as:
 *<pre>
 *    <autoincrement-modules>
 *      <component-instance
class="org.apache.cocoon.components.modules.database.OraShortIncrementModule"
logger="steLog" name="auto-ora-short"/>
 *</pre>
 * In the mdb configuartion file definition,
 *<pre>
 *   <table ...> ...
 *   ...
 *      <key ...>
 *         <mode name="auto-ora-short" type="autoincr"
 *               sequence="u're-sequence-name" />
 *</pre>
 * where mode/@sequence is u're Oracle sequence name.
 **/
public class OraSeqShortIncrementModule extends OraSeqIncrementModule
    implements ThreadSafe {

    /**
     * @return false: key appears as a subquery, <sequence>.NEXTVAL, in
the final query. Only one query will be sent to the DB.
     **/
    public boolean includeAsValue() {
	return false;
    }

    public String getSubquery( Configuration tableConf, Configuration
columnConf, Configuration modeConf) throws ConfigurationException {
	String sequence = modeConf.getAttribute("sequence", null);
	if( null==sequence )
	    throw new ConfigurationException("ERROR!!! Please define your
sequence name in mdb file, under
table[name="+tableConf.getAttribute("name")+"]/key[@name="+columnConf.getAttribute("name")+"]/mode/@sequence"
);
        if (getLogger().isDebugEnabled() )
            getLogger().debug("Get NEXTVAL from ORA-sequence:"+sequence );
        return " "+sequence+".NEXTVAL";
    }

}

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