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eFaps is a framework used to map objects with or without attached files to
a relational database and optional file systems (only for attaches files). Configurable access control can be provided down to object and attribute level depending on implementation and use case. Depending on requirements, events (like triggers) allow to implement business logic and to separate business logic from user interface.
The framework includes integrations (e.g. webdav, full text search) and a web application as 'simple' configurable user interface. Some best practises, example web application modules (e.g. team work module) support administrators and implementers using this framework.
/*
* Copyright 2003 - 2012 The eFaps Team
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* Revision: $Rev: 7483 $
* Last Changed: $Date: 2012-05-11 11:57:38 -0500 (Fri, 11 May 2012) $
* Last Changed By: $Author: [email protected] $
*/
package org.efaps.db.print;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.List;
import org.efaps.admin.datamodel.Attribute;
import org.efaps.admin.datamodel.Type;
import org.efaps.db.AbstractPrintQuery;
import org.efaps.db.Context;
import org.efaps.db.Instance;
import org.efaps.db.InstanceQuery;
import org.efaps.db.transaction.ConnectionResource;
import org.efaps.db.wrapper.SQLPart;
import org.efaps.db.wrapper.SQLSelect;
import org.efaps.util.EFapsException;
/**
* Select Part for linkfrom[TYPERNAME#ATTRIBUTENAME].
*
* @author The eFaps Team
* @version $Id: LinkFromSelect.java 7483 2012-05-11 16:57:38Z [email protected] $
*/
public class LinkFromSelect
extends AbstractPrintQuery
{
/**
* Name of the Attribute the link to is based on.
*/
private final String attrName;
/**
* Type the {@link #attrName} belongs to.
*/
private final Type type;
/**
* Did this query return a result.
*/
private boolean hasResult;
/**
* @param _linkFrom linkfrom element of the query
*/
public LinkFromSelect(final String _linkFrom)
{
final String[] linkfrom = _linkFrom.split("#");
this.type = Type.get(linkfrom[0]);
this.attrName = linkfrom[1];
final OneSelect onsel = new OneSelect(this, _linkFrom);
addOneSelect(onsel);
onsel.setFromSelect(this);
onsel.getSelectParts().add(new ISelectPart() {
public Type getType()
{
return LinkFromSelect.this.type;
}
public int join(final OneSelect _oneselect,
final SQLSelect _select,
final int _relIndex)
{
// nothing to join here
return 0;
}
@Override
public void addObject(final ResultSet _rs)
throws SQLException
{
// no objects must be added
}
@Override
public Object getObject()
{
return null;
}
@Override
public void add2Where(final OneSelect _oneselect,
final SQLSelect _select)
{
// no clause must be added
}
});
}
/**
* Getter method for instance variable {@link #hasResult}.
*
* @return value of instance variable {@link #hasResult}
*/
public boolean hasResult()
{
return this.hasResult;
}
/**
* Execute the from select for the given instance.
* @param _onesel instance
* @throws EFapsException on error
* @return true if statement didi return values, else false
*/
public boolean execute(final OneSelect _onesel)
throws EFapsException
{
this.hasResult = executeOneCompleteStmt(createSQLStatement(_onesel), getAllSelects());
return this.hasResult;
}
/**
* Method to create on Statement out of the different parts.
*
* @param _parentOnesel instance
* @return String containing the SQL statement
* @throws EFapsException on error
*/
private String createSQLStatement(final OneSelect _parentOnesel)
throws EFapsException
{
final Attribute attr = this.type.getAttribute(this.attrName);
final SQLSelect select = new SQLSelect()
.column(0, "ID")
.column(0, attr.getSqlColNames().get(0))
.from(this.type.getMainTable().getSqlTable(), 0);
// on a from select only one table is the base
getAllSelects().get(0).append2SQLFrom(select);
int colIndex = select.getColumns().size() + 1;
for (final OneSelect oneSel : getAllSelects()) {
colIndex += oneSel.append2SQLSelect(select, colIndex);
}
select.addPart(SQLPart.WHERE)
.addColumnPart(0, attr.getSqlColNames().get(0))
.addPart(SQLPart.IN).addPart(SQLPart.PARENTHESIS_OPEN);
if (_parentOnesel.isMultiple()) {
boolean first = true;
final List ids = (List) _parentOnesel.getObject();
for (final Object id : ids) {
if (first) {
first = false;
} else {
select.addPart(SQLPart.COMMA);
}
select.addValuePart(id);
}
} else {
select.addValuePart(_parentOnesel.getObject());
}
select.addPart(SQLPart.PARENTHESIS_CLOSE);
_parentOnesel.setValueSelect(null);
// in a subquery the type must also be set
if (this.type.getMainTable().getSqlColType() != null) {
select.addPart(SQLPart.AND)
.addColumnPart(0, this.type.getMainTable().getSqlColType())
.addPart(SQLPart.IN).addPart(SQLPart.PARENTHESIS_OPEN);
boolean first = true;
if (this.type.isAbstract()) {
for (final Type atype : getAllChildTypes(this.type)) {
if (first) {
first = false;
} else {
select.addPart(SQLPart.COMMA);
}
select.addValuePart(atype.getId());
}
} else {
select.addValuePart(this.type.getId());
}
select.addPart(SQLPart.PARENTHESIS_CLOSE);
}
if (AbstractPrintQuery.LOG.isDebugEnabled()) {
AbstractPrintQuery.LOG.debug(select.getSQL());
}
return select.getSQL();
}
/**
* Recursive method to get all child types for a type.
* @param _parent parent type
* @return list of all child types
*/
private List getAllChildTypes(final Type _parent)
{
final List ret = new ArrayList();
for (final Type child : _parent.getChildTypes()) {
ret.addAll(getAllChildTypes(child));
ret.add(child);
}
return ret;
}
/**
* {@inheritDoc}
*/
@Override
protected boolean executeOneCompleteStmt(final String _complStmt,
final List _oneSelects)
throws EFapsException
{
boolean ret = false;
ConnectionResource con = null;
try {
con = Context.getThreadContext().getConnectionResource();
if (AbstractPrintQuery.LOG.isDebugEnabled()) {
AbstractPrintQuery.LOG.debug(_complStmt.toString());
}
final Statement stmt = con.getConnection().createStatement();
final ResultSet rs = stmt.executeQuery(_complStmt.toString());
while (rs.next()) {
for (final OneSelect onesel : _oneSelects) {
onesel.addObject(rs);
}
ret = true;
}
rs.close();
stmt.close();
con.commit();
} catch (final SQLException e) {
throw new EFapsException(InstanceQuery.class, "executeOneCompleteStmt", e);
} finally {
if (con != null && con.isOpened()) {
con.abort();
}
}
return ret;
}
/**
* Getter method for instance variable {@link #oneSelect}.
*
* @return value of instance variable {@link #oneSelect}
*/
public OneSelect getMainOneSelect()
{
return getAllSelects().get(0);
}
/**
* Returns the {@link #type} for which the attribute {@link #attrName}
* belongs to.
*
* @return type
* @see #type
*/
public Type getType()
{
return this.type;
}
/**
* {@inheritDoc}
*/
@Override
public Instance getCurrentInstance()
{
return null;
}
/**
* {@inheritDoc}
*/
@Override
public List getInstanceList()
{
return null;
}
/**
* {@inheritDoc}
*/
@Override
public Type getMainType()
{
return null;
}
}