org.sakaiproject.util.BaseDbSingleStorage Maven / Gradle / Ivy
/**********************************************************************************
* $URL: https://source.sakaiproject.org/svn/kernel/trunk/kernel-util/src/main/java/org/sakaiproject/util/BaseDbSingleStorage.java $
* $Id: BaseDbSingleStorage.java 82134 2010-09-07 21:52:06Z [email protected] $
***********************************************************************************
*
* Copyright (c) 2003, 2004, 2005, 2006, 2007, 2008 Sakai Foundation
*
* Licensed under the Educational Community 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.opensource.org/licenses/ECL-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.
*
**********************************************************************************/
package org.sakaiproject.util;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.Hashtable;
import java.util.List;
import java.util.Map;
import java.util.Stack;
import java.util.Vector;
import lombok.extern.slf4j.Slf4j;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.sakaiproject.db.api.SqlReader;
import org.sakaiproject.db.api.SqlService;
import org.sakaiproject.entity.api.Edit;
import org.sakaiproject.entity.api.Entity;
import org.sakaiproject.event.cover.UsageSessionService;
import org.sakaiproject.javax.Filter;
import org.sakaiproject.time.cover.TimeService;
/**
* Single Storage provides persisting of just resources(no properties, no container).
*
* BaseDbSingleStorage is a class that stores Resources (of some type) in a database,
* provides locked access, and generally implements a services "storage" class. The
* service's storage class can extend this to provide covers to turn Resource and
* Edit into something more type specific to the service.
*
*
* Note: the methods here are all "id" based, with the following assumptions:
- just the Resource Id field is enough to distinguish one
* Resource from another
- a resource's reference is based on no more than the resource id
- a resource's id cannot change.
*
*
* In order to handle Unicode characters properly, the SQL statements executed by this class
* should not embed Unicode characters into the SQL statement text; rather, Unicode values
* should be inserted as fields in a PreparedStatement. Databases handle Unicode better in fields.
*
*/
@Slf4j
public class BaseDbSingleStorage implements DbSingleStorage
{
public static final String STORAGE_FIELDS = "XML";
/** Table name for resource records. */
protected String m_resourceTableName = null;
/** The field in the resource table that holds the resource id. */
protected String m_resourceTableIdField = null;
/** The additional field names in the resource table that go between the two ids and the xml */
protected String[] m_resourceTableOtherFields = null;
/** The xml tag name for the element holding each actual resource entry. */
protected String m_resourceEntryTagName = null;
/** If true, we do our locks in the remote database. */
protected boolean m_locksAreInDb = false;
/** If true, we do our locks in the remove database using a separate locking table. */
protected boolean m_locksAreInTable = true;
/** The StorageUser to callback for new Resource and Edit objects. */
protected SingleStorageUser m_user = null;
/**
* Locks, keyed by reference, holding Connections (or, if locks are done locally, holding an Edit).
* Obviously this doesn't enable locking in a clustered environment.
*/
protected Hashtable m_locks = null;
/** If set, we treat reasource ids as case insensitive. */
protected boolean m_caseInsensitive = false;
/** Injected (by constructor) SqlService. */
protected SqlService m_sql = null;
/** contains a map of the database dependent handlers. */
protected static Map databaseBeans;
/** The db handler we are using. */
protected SingleStorageSql singleStorageSql;
/* (non-Javadoc)
* @see org.sakaiproject.util.DbSingleStorage#setDatabaseBeans(java.util.Map)
*/
public void setDatabaseBeans(Map databaseBeans)
{
this.databaseBeans = databaseBeans;
}
/* (non-Javadoc)
* @see org.sakaiproject.util.DbSingleStorage#setSingleStorageSql(java.lang.String)
*/
public void setSingleStorageSql(String vendor)
{
this.singleStorageSql = (databaseBeans.containsKey(vendor) ? databaseBeans.get(vendor) : databaseBeans.get("default"));
}
// since spring is not used and this class is instatiated directly, we need to "inject" these values ourselves
static
{
databaseBeans = new Hashtable();
databaseBeans.put("default", new SingleStorageSqlDefault());
databaseBeans.put("hsql", new SingleStorageSqlHSql());
databaseBeans.put("mysql", new SingleStorageSqlMySql());
databaseBeans.put("oracle", new SingleStorageSqlOracle());
}
/**
* Construct.
*
* @param resourceTableName
* Table name for resources.
* @param resourceTableIdField
* The field in the resource table that holds the id.
* @param resourceTableOtherFields
* The other fields in the resource table (between the two id and the xml fields).
* @param locksInDb
* If true, we do our locks in the remote database, otherwise we do them here.
* @param resourceEntryName
* The xml tag name for the element holding each actual resource entry.
* @param user
* The StorageUser class to call back for creation of Resource and Edit objects.
* @param sqlService
* The SqlService.
*/
public BaseDbSingleStorage(String resourceTableName, String resourceTableIdField, String[] resourceTableOtherFields, boolean locksInDb,
String resourceEntryName, SingleStorageUser user, SqlService sqlService)
{
this(resourceTableName, resourceTableIdField, resourceTableOtherFields, locksInDb, resourceEntryName, user, sqlService, null);
}
// support for SAK-12874
protected DbSingleStorage m_storage = null;
/**
* Construct.
*
* @param resourceTableName
* Table name for resources.
* @param resourceTableIdField
* The field in the resource table that holds the id.
* @param resourceTableOtherFields
* The other fields in the resource table (between the two id and the xml fields).
* @param locksInDb
* If true, we do our locks in the remote database, otherwise we do them here.
* @param resourceEntryName
* The xml tag name for the element holding each actual resource entry.
* @param user
* The StorageUser class to call back for creation of Resource and Edit objects.
* @param sqlService
* The SqlService.
* @param storage
* The storage for the normal resource (only used by delete storage)
*/
public BaseDbSingleStorage(String resourceTableName, String resourceTableIdField, String[] resourceTableOtherFields, boolean locksInDb,
String resourceEntryName, SingleStorageUser user, SqlService sqlService,
DbSingleStorage storage)
{
m_resourceTableName = resourceTableName;
m_resourceTableIdField = resourceTableIdField;
m_resourceTableOtherFields = resourceTableOtherFields;
m_locksAreInDb = locksInDb;
m_resourceEntryTagName = resourceEntryName;
m_user = user;
m_sql = sqlService;
// support for SAK-12874
m_storage = storage;
if (m_storage == null && m_resourceTableName != null && m_resourceTableName.toUpperCase().contains("DELETE")) {
// warn if the delete storage does not have the main storage set
log.warn("resource storage is not set, delete table resource file paths will be invalid");
}
setSingleStorageSql(m_sql.getVendor());
}
/* (non-Javadoc)
* @see org.sakaiproject.util.DbSingleStorage#open()
*/
public void open()
{
// setup for locks
m_locks = new Hashtable();
}
/* (non-Javadoc)
* @see org.sakaiproject.util.DbSingleStorage#close()
*/
public void close()
{
if (!m_locks.isEmpty())
{
log.warn("close(): locks remain!");
// %%%
}
m_locks.clear();
m_locks = null;
}
/**
* Read one Resource from xml
*
* @param xml
* An string containing the xml which describes the resource.
* @return The Resource object created from the xml.
*/
protected Entity readResource(String xml)
{
try
{
if (m_user instanceof SAXEntityReader)
{
SAXEntityReader sm_user = (SAXEntityReader) m_user;
DefaultEntityHandler deh = sm_user.getDefaultHandler(sm_user
.getServices());
StorageUtils.processString(xml, deh);
return deh.getEntity();
}
else
{
// read the xml
Document doc = StorageUtils.readDocumentFromString(xml);
// verify the root element
Element root = doc.getDocumentElement();
if (!root.getTagName().equals(m_resourceEntryTagName))
{
log.warn("readResource(): not = " + m_resourceEntryTagName + " : "
+ root.getTagName());
return null;
}
// re-create a resource
Entity entry = m_user.newResource(null, root);
return entry;
}
}
catch (Exception e)
{
log.debug("readResource(): ", e);
return null;
}
}
/* (non-Javadoc)
* @see org.sakaiproject.util.DbSingleStorage#checkResource(java.lang.String)
*/
public boolean checkResource(String id)
{
// just see if the record exists
String sql = singleStorageSql.getResourceIdSql(m_resourceTableIdField, m_resourceTableName);
Object fields[] = new Object[1];
fields[0] = caseId(id);
List ids = m_sql.dbRead(sql, fields, null);
return (!ids.isEmpty());
}
/* (non-Javadoc)
* @see org.sakaiproject.util.DbSingleStorage#getResource(java.lang.String)
*/
public Entity getResource(String id)
{
Entity entry = null;
// get the user from the db
String sql = singleStorageSql.getXmlSql(m_resourceTableIdField, m_resourceTableName);
Object fields[] = new Object[1];
fields[0] = caseId(id);
List xml = m_sql.dbRead(sql, fields, null);
if (!xml.isEmpty())
{
// create the Resource from the db xml
entry = readResource((String) xml.get(0));
}
return entry;
}
/* (non-Javadoc)
* @see org.sakaiproject.util.DbSingleStorage#isEmpty()
*/
public boolean isEmpty()
{
// count
int count = countAllResources();
return (count == 0);
}
/* (non-Javadoc)
* @see org.sakaiproject.util.DbSingleStorage#getAllResources()
*/
public List getAllResources()
{
List all = new Vector();
// read all users from the db
String sql = singleStorageSql.getXmlSql(m_resourceTableName);
// %%% + "order by " + m_resourceTableOrderField + " asc";
List xml = m_sql.dbRead(sql);
// process all result xml into user objects
if (!xml.isEmpty())
{
for (int i = 0; i < xml.size(); i++)
{
Entity entry = readResource((String) xml.get(i));
if (entry != null) all.add(entry);
}
}
return all;
}
/* (non-Javadoc)
* @see org.sakaiproject.util.DbSingleStorage#getAllResources(int, int)
*/
public List getAllResources(int first, int last)
{
String sql = singleStorageSql.getXmlSql(m_resourceTableIdField, m_resourceTableName, first, last);
Object[] fields = singleStorageSql.getXmlFields(first, last);
List xml = m_sql.dbRead(sql, fields, null);
List rv = new Vector();
// process all result xml into user objects
if (!xml.isEmpty())
{
for (int i = 0; i < xml.size(); i++)
{
Entity entry = readResource((String) xml.get(i));
if (entry != null) rv.add(entry);
}
}
return rv;
}
/* (non-Javadoc)
* @see org.sakaiproject.util.DbSingleStorage#countAllResources()
*/
public int countAllResources()
{
// read all count
String sql = singleStorageSql.getNumRowsSql(m_resourceTableName);
List results = m_sql.dbRead(sql, null, new SqlReader()
{
public Object readSqlResultRecord(ResultSet result)
{
try
{
int count = result.getInt(1);
return Integer.valueOf(count);
}
catch (SQLException ignore)
{
return null;
}
}
});
if (results.isEmpty()) return 0;
return ((Integer) results.get(0)).intValue();
}
/* (non-Javadoc)
* @see org.sakaiproject.util.DbSingleStorage#countSelectedResourcesWhere(java.lang.String)
*/
public int countSelectedResourcesWhere(String sqlWhere)
{
// read all where count
String sql = singleStorageSql.getNumRowsSql(m_resourceTableName, sqlWhere);
List results = m_sql.dbRead(sql, null, new SqlReader()
{
public Object readSqlResultRecord(ResultSet result)
{
try
{
int count = result.getInt(1);
return Integer.valueOf(count);
}
catch (SQLException ignore)
{
return null;
}
}
});
if (results.isEmpty()) return 0;
return ((Integer) results.get(0)).intValue();
}
/* (non-Javadoc)
* @see org.sakaiproject.util.DbSingleStorage#getAllResourcesWhere(java.lang.String, java.lang.String)
*/
public List getAllResourcesWhere(String field, String value)
{
// read all users from the db
String sql = singleStorageSql.getXmlSql(field, m_resourceTableName);
Object[] fields = new Object[1];
fields[0] = value;
// %%% + "order by " + m_resourceTableOrderField + " asc";
return loadResources(sql, fields);
}
protected List loadResources(String sql, Object[] fields)
{
List all = m_sql.dbRead(sql, fields, new SqlReader()
{
public Object readSqlResultRecord(ResultSet result)
{
try
{
// create the Resource from the db xml
String xml = result.getString(1);
Entity entry = readResource(xml);
return entry;
}
catch (SQLException ignore)
{
return null;
}
}
});
return all;
}
/**
* Get a limited number of Resources a given field matches a given value, returned in ascending order
* by another field. The limit on the number of rows is specified by values for the first item to be
* retrieved (indexed from 0) and the maxCount.
* @param selectBy The name of a field to be used in selecting resources.
* @param selectByValue The value to select.
* @param orderBy The name of a field to be used in ordering the resources.
* @param tableName The table on which the query is to operate
* @param first A non-negative integer indicating the first record to return
* @param maxCount A positive integer indicating the maximum number of rows to return
* @return The list of all Resources that meet the criteria.
*/
public List getAllResourcesWhere(String selectBy, String selectByValue, String orderBy, int first, int maxCount)
{
// read all users from the db
String sql = singleStorageSql.getXmlWhereLimitSql(selectBy, orderBy, m_resourceTableName, first, maxCount);
Object[] fields = new Object[1];
fields[0] = selectByValue;
// %%% + "order by " + m_resourceTableOrderField + " asc";
return loadResources(sql, fields);
}
/* (non-Javadoc)
* @see org.sakaiproject.util.DbSingleStorage#getAllResourcesWhereLike(java.lang.String, java.lang.String)
*/
public List getAllResourcesWhereLike(String field, String value)
{
String sql = singleStorageSql.getXmlLikeSql(field, m_resourceTableName);
Object[] fields = new Object[1];
fields[0] = value;
// %%% + "order by " + m_resourceTableOrderField + " asc";
return loadResources(sql, fields);
}
/* (non-Javadoc)
* @see org.sakaiproject.util.DbSingleStorage#getSelectedResources(org.sakaiproject.javax.Filter)
*/
public List getSelectedResources(final Filter filter)
{
List all = new Vector();
// read all users from the db
String sql = singleStorageSql.getXmlAndFieldSql(m_resourceTableIdField, m_resourceTableName);
// %%% + "order by " + m_resourceTableOrderField + " asc";
List xml = m_sql.dbRead(sql, null, new SqlReader()
{
public Object readSqlResultRecord(ResultSet result)
{
try
{
// read the id m_resourceTableIdField
String id = result.getString(1);
// read the xml
String xml = result.getString(2);
if (!filter.accept(caseId(id))) return null;
return xml;
}
catch (SQLException ignore)
{
return null;
}
}
});
// process all result xml into user objects
if (!xml.isEmpty())
{
for (int i = 0; i < xml.size(); i++)
{
Entity entry = readResource((String) xml.get(i));
if (entry != null) all.add(entry);
}
}
return all;
}
/* (non-Javadoc)
* @see org.sakaiproject.util.DbSingleStorage#getSelectedResourcesWhere(java.lang.String)
*/
public List getSelectedResourcesWhere(String sqlWhere)
{
List all = new Vector();
// read all users from the db
String sql = singleStorageSql.getXmlWhereSql(m_resourceTableName, sqlWhere);
// %%% + "order by " + m_resourceTableOrderField + " asc";
List xml = m_sql.dbRead(sql);
// process all result xml into user objects
if (!xml.isEmpty())
{
for (int i = 0; i < xml.size(); i++)
{
Entity entry = readResource((String) xml.get(i));
if (entry != null) all.add(entry);
}
}
return all;
}
/* (non-Javadoc)
* @see org.sakaiproject.util.DbSingleStorage#putResource(java.lang.String, java.lang.Object[])
*/
public Edit putResource(String id, Object[] others)
{
// create one with just the id, and perhaps some other fields as well
Entity entry = m_user.newResource(null, id, others);
// form the XML and SQL for the insert
Document doc = StorageUtils.createDocument();
entry.toXml(doc, new Stack());
String xml = StorageUtils.writeDocumentToString(doc);
String statement = // singleStorageSql.
"insert into " + m_resourceTableName + insertFields(m_resourceTableIdField, m_resourceTableOtherFields, "XML") + " values ( ?, "
+ valuesParams(m_resourceTableOtherFields) + " ? )";
Object[] flds = m_user.storageFields(entry);
if (flds == null) flds = new Object[0];
Object[] fields = new Object[flds.length + 2];
System.arraycopy(flds, 0, fields, 1, flds.length);
fields[0] = caseId(entry.getId());
fields[fields.length - 1] = xml;
// process the insert
boolean ok = m_sql.dbWrite(statement, fields);
// if this failed, assume a key conflict (i.e. id in use)
if (!ok) return null;
// now get a lock on the record for edit
Edit edit = editResource(id);
if (edit == null)
{
log.warn("putResource(): didn't get a lock!");
return null;
}
return edit;
}
/* (non-Javadoc)
* @see org.sakaiproject.util.DbSingleStorage#putDeleteResource(java.lang.String, java.lang.String, java.lang.String, java.lang.Object[])
*/
public Edit putDeleteResource(String id, String uuid, String userId, Object[] others)
{
// support for SAK-12874
Entity entry = null;
if (m_storage != null) {
// use the object being deleted
entry = m_storage.getResource(id);
}
if (entry == null) {
// failsafe to the old method
entry = m_user.newResource(null, id, others);
}
//Entity entry = m_user.newResource(null, id, others);
// form the XML and SQL for the insert
Document doc = StorageUtils.createDocument();
entry.toXml(doc, new Stack());
String xml = StorageUtils.writeDocumentToString(doc);
String statement = "insert into " + m_resourceTableName
+ insertDeleteFields(m_resourceTableIdField, m_resourceTableOtherFields, "RESOURCE_UUID", "DELETE_DATE", "DELETE_USERID", "XML")
+ " values ( ?, " + valuesParams(m_resourceTableOtherFields) + " ? ,? ,? ,?)";
Object[] flds = m_user.storageFields(entry);
if (flds == null) flds = new Object[0];
Object[] fields = new Object[flds.length + 5];
System.arraycopy(flds, 0, fields, 1, flds.length);
fields[0] = caseId(entry.getId());
// uuid added here
fields[fields.length - 4] = uuid;
// date added here
fields[fields.length - 3] = TimeService.newTime();// .toStringLocalDate();
// userId added here
fields[fields.length - 2] = userId;
fields[fields.length - 1] = xml;
// process the insert
boolean ok = m_sql.dbWrite(statement, fields);
// if this failed, assume a key conflict (i.e. id in use)
if (!ok) return null;
// now get a lock on the record for edit
Edit edit = editResource(id);
if (edit == null)
{
log.warn("putResourceDelete(): didn't get a lock!");
return null;
}
return edit;
}
/** Construct the SQL statement */
protected String insertDeleteFields(String before, String[] fields, String uuid, String date, String userId, String after)
{
StringBuilder buf = new StringBuilder();
buf.append(" (");
buf.append(before);
buf.append(",");
if (fields != null)
{
for (int i = 0; i < fields.length; i++)
{
buf.append(fields[i] + ",");
}
}
buf.append(uuid);
buf.append(",");
buf.append(date);
buf.append(",");
buf.append(userId);
buf.append(",");
buf.append(after);
buf.append(")");
return buf.toString();
}
/* (non-Javadoc)
* @see org.sakaiproject.util.DbSingleStorage#commitDeleteResource(org.sakaiproject.entity.api.Edit, java.lang.String)
*/
public void commitDeleteResource(Edit edit, String uuid)
{
// form the SQL statement and the var w/ the XML
Document doc = StorageUtils.createDocument();
edit.toXml(doc, new Stack());
String xml = StorageUtils.writeDocumentToString(doc);
Object[] flds = m_user.storageFields(edit);
if (flds == null) flds = new Object[0];
Object[] fields = new Object[flds.length + 2];
System.arraycopy(flds, 0, fields, 0, flds.length);
fields[fields.length - 2] = xml;
fields[fields.length - 1] = uuid;// caseId(edit.getId());
String statement = "update " + m_resourceTableName + " set " + updateSet(m_resourceTableOtherFields) + " XML = ? where ( RESOURCE_UUID = ? )";
if (m_locksAreInDb)
{
// use this connection that is stored with the lock
Connection lock = (Connection) m_locks.get(edit.getReference());
if (lock == null)
{
log.warn("commitResource(): edit not in locks");
return;
}
// update, commit, release the lock's connection
m_sql.dbUpdateCommit(statement, fields, null, lock);
// remove the lock
m_locks.remove(edit.getReference());
}
else if (m_locksAreInTable)
{
// process the update
m_sql.dbWrite(statement, fields);
// remove the lock
statement = singleStorageSql.getDeleteLocksSql();
// collect the fields
Object lockFields[] = new Object[2];
lockFields[0] = m_resourceTableName;
lockFields[1] = internalRecordId(caseId(edit.getId()));
boolean ok = m_sql.dbWrite(statement, lockFields);
if (!ok)
{
log.warn("commit: missing lock for table: " + lockFields[0] + " key: " + lockFields[1]);
}
}
else
{
// just process the update
m_sql.dbWrite(statement, fields);
// remove the lock
m_locks.remove(edit.getReference());
}
}
/* (non-Javadoc)
* @see org.sakaiproject.util.DbSingleStorage#editResource(java.lang.String)
*/
public Edit editResource(String id)
{
Edit edit = null;
if (m_locksAreInDb)
{
if ("oracle".equals(m_sql.getVendor()))
{
// read the record and get a lock on it (non blocking)
String statement = "select XML from " + m_resourceTableName + " where ( " + m_resourceTableIdField + " = '"
+ StorageUtils.escapeSql(caseId(id)) + "' )" + " for update nowait";
StringBuilder result = new StringBuilder();
Connection lock = m_sql.dbReadLock(statement, result);
// for missing or already locked...
if ((lock == null) || (result.length() == 0)) return null;
// make first a Resource, then an Edit
Entity entry = readResource(result.toString());
edit = m_user.newResourceEdit(null, entry);
// store the lock for this object
m_locks.put(entry.getReference(), lock);
}
else
{
throw new UnsupportedOperationException("Record locking only available when configured with Oracle database");
}
}
// if the locks are in a separate table in the db
else if (m_locksAreInTable)
{
// read the record - fail if not there
Entity entry = getResource(id);
if (entry == null) return null;
// write a lock to the lock table - if we can do it, we get the lock
String statement = singleStorageSql.getInsertLocks();
// we need session id and user id
String sessionId = UsageSessionService.getSessionId();
if (sessionId == null)
{
sessionId = ""; // TODO - "" gets converted to a null and will never be able to be cleaned up -AZ (SAK-11841)
}
// collect the fields
Object fields[] = new Object[4];
fields[0] = m_resourceTableName;
fields[1] = internalRecordId(caseId(id));
fields[2] = TimeService.newTime();
fields[3] = sessionId;
// add the lock - if fails, someone else has the lock
boolean ok = m_sql.dbWriteFailQuiet(null, statement, fields);
if (!ok)
{
return null;
}
// we got the lock! - make the edit from the Resource
edit = m_user.newResourceEdit(null, entry);
}
// otherwise, get the lock locally
else
{
// get the entry, and check for existence
Entity entry = getResource(id);
if (entry == null) return null;
// we only sync this getting - someone may release a lock out of sync
synchronized (m_locks)
{
// if already locked
if (m_locks.containsKey(entry.getReference())) return null;
// make the edit from the Resource
edit = m_user.newResourceEdit(null, entry);
// store the edit in the locks by reference
m_locks.put(entry.getReference(), edit);
}
}
return edit;
}
/* (non-Javadoc)
* @see org.sakaiproject.util.DbSingleStorage#commitResource(org.sakaiproject.entity.api.Edit)
*/
public void commitResource(Edit edit)
{
// form the SQL statement and the var w/ the XML
Document doc = StorageUtils.createDocument();
edit.toXml(doc, new Stack());
String xml = StorageUtils.writeDocumentToString(doc);
Object[] flds = m_user.storageFields(edit);
if (flds == null) flds = new Object[0];
Object[] fields = new Object[flds.length + 2];
System.arraycopy(flds, 0, fields, 0, flds.length);
fields[fields.length - 2] = xml;
fields[fields.length - 1] = caseId(edit.getId());
String statement = "update " + m_resourceTableName + " set " + updateSet(m_resourceTableOtherFields) + " XML = ? where ( "
+ m_resourceTableIdField + " = ? )";
// singleStorageSql.getUpdateXml(m_resourceTableIdField, m_resourceTableOtherFields, m_resourceTableName);
if (m_locksAreInDb)
{
// use this connection that is stored with the lock
Connection lock = (Connection) m_locks.get(edit.getReference());
if (lock == null)
{
log.warn("commitResource(): edit not in locks");
return;
}
// update, commit, release the lock's connection
m_sql.dbUpdateCommit(statement, fields, null, lock);
// remove the lock
m_locks.remove(edit.getReference());
}
else if (m_locksAreInTable)
{
// process the update
m_sql.dbWrite(statement, fields);
// remove the lock
statement = singleStorageSql.getDeleteLocksSql();
// collect the fields
Object lockFields[] = new Object[2];
lockFields[0] = m_resourceTableName;
lockFields[1] = internalRecordId(caseId(edit.getId()));
boolean ok = m_sql.dbWrite(statement, lockFields);
if (!ok)
{
log.warn("commit: missing lock for table: " + lockFields[0] + " key: " + lockFields[1]);
}
}
else
{
// just process the update
m_sql.dbWrite(statement, fields);
// remove the lock
m_locks.remove(edit.getReference());
}
}
/* (non-Javadoc)
* @see org.sakaiproject.util.DbSingleStorage#cancelResource(org.sakaiproject.entity.api.Edit)
*/
public void cancelResource(Edit edit)
{
if (m_locksAreInDb)
{
// use this connection that is stored with the lock
Connection lock = (Connection) m_locks.get(edit.getReference());
if (lock == null)
{
log.warn("cancelResource(): edit not in locks");
return;
}
// rollback and release the lock's connection
m_sql.dbCancel(lock);
// release the lock
m_locks.remove(edit.getReference());
}
else if (m_locksAreInTable)
{
// remove the lock
String statement = singleStorageSql.getDeleteLocksSql();
// collect the fields
Object lockFields[] = new Object[2];
lockFields[0] = m_resourceTableName;
lockFields[1] = internalRecordId(caseId(edit.getId()));
boolean ok = m_sql.dbWrite(statement, lockFields);
if (!ok)
{
log.warn("cancel: missing lock for table: " + lockFields[0] + " key: " + lockFields[1]);
}
}
else
{
// release the lock
m_locks.remove(edit.getReference());
}
}
/* (non-Javadoc)
* @see org.sakaiproject.util.DbSingleStorage#removeResource(org.sakaiproject.entity.api.Edit)
*/
public void removeResource(Edit edit)
{
// form the SQL delete statement
String statement = singleStorageSql.getDeleteSql(m_resourceTableIdField, m_resourceTableName);
Object fields[] = new Object[1];
fields[0] = caseId(edit.getId());
if (m_locksAreInDb)
{
// use this connection that is stored with the lock
Connection lock = (Connection) m_locks.get(edit.getReference());
if (lock == null)
{
log.warn("removeResource(): edit not in locks");
return;
}
// process the delete statement, commit, and release the lock's connection
m_sql.dbUpdateCommit(statement, fields, null, lock);
// release the lock
m_locks.remove(edit.getReference());
}
else if (m_locksAreInTable)
{
// process the delete statement
m_sql.dbWrite(statement, fields);
// remove the lock
statement = singleStorageSql.getDeleteLocksSql();
// collect the fields
Object lockFields[] = new Object[2];
lockFields[0] = m_resourceTableName;
lockFields[1] = internalRecordId(caseId(edit.getId()));
boolean ok = m_sql.dbWrite(statement, lockFields);
if (!ok)
{
log.warn("remove: missing lock for table: " + lockFields[0] + " key: " + lockFields[1]);
}
}
else
{
// process the delete statement
m_sql.dbWrite(statement, fields);
// release the lock
m_locks.remove(edit.getReference());
}
}
/**
* Form a string of n question marks with commas, for sql value statements, one for each item in the values array, or an empty string if null.
*
* @param values
* The values to be inserted into the sql statement.
* @return A sql statement fragment for the values part of an insert, one for each value in the array.
*/
protected String valuesParams(String[] fields)
{
if ((fields == null) || (fields.length == 0)) return "";
StringBuilder buf = new StringBuilder();
for (int i = 0; i < fields.length; i++)
{
buf.append(" ?,");
}
return buf.toString();
}
/**
* Form a string of n name=?, for sql update set statements, one for each item in the values array, or an empty string if null.
*
* @param values
* The values to be inserted into the sql statement.
* @return A sql statement fragment for the values part of an insert, one for each value in the array.
*/
protected String updateSet(String[] fields)
{
if ((fields == null) || (fields.length == 0)) return "";
StringBuilder buf = new StringBuilder();
for (int i = 0; i < fields.length; i++)
{
buf.append(fields[i] + " = ?,");
}
return buf.toString();
}
/**
* Form a string of (field, field, field), for sql insert statements, one for each item in the fields array, plus one before, and one after.
*
* @param before
* The first field name.
* @param values
* The extra field names, in the middle.
* @param after
* The last field name.
* @return A sql statement fragment for the insert fields.
*/
protected String insertFields(String before, String[] fields, String after)
{
StringBuilder buf = new StringBuilder();
buf.append(" (");
buf.append(before);
buf.append(",");
if (fields != null)
{
for (int i = 0; i < fields.length; i++)
{
buf.append(fields[i] + ",");
}
}
buf.append(after);
buf.append(")");
return buf.toString();
}
/**
* Fix the case of resource ids to support case insensitive ids if enabled
*
* @param The
* id to fix.
* @return The id, case modified as needed.
*/
protected String caseId(String id)
{
if (m_caseInsensitive)
{
return id.toLowerCase();
}
return id;
}
/**
* Enable / disable case insensitive ids.
*
* @param setting
* true to set case insensitivity, false to set case sensitivity.
*/
protected void setCaseInsensitivity(boolean setting)
{
m_caseInsensitive = setting;
}
/**
* Return a record ID to use internally in the database. This is needed for databases (MySQL) that have limits on key lengths. The hash code
* ensures that the record ID will be unique, even if the DB only considers a prefix of a very long record ID.
*
* @param recordId
* @return The record ID to use internally in the database
*/
private String internalRecordId(String recordId)
{
if ("mysql".equals(m_sql.getVendor()))
{
if (recordId == null) recordId = "null";
return recordId.hashCode() + " - " + recordId;
}
else
// oracle, hsqldb
{
return recordId;
}
}
}
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