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Plugin for DataNucleus providing persistence to RDBMS datastores.

There is a newer version: 6.0.7

/**********************************************************************
Copyright (c) 2002 Mike Martin (TJDO) and others. All rights reserved. 
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.

Contributors:
2003 Erik Bengtson  - optimistic transaction support
2004 Andy Jefferson - coding standards
2004 Andy Jefferson - conversion to use Logger
2005 Andy Jefferson - added handling for updating FK in related object
2006 Andy Jefferson - changed to extend VersionCheckRequest
    ...
**********************************************************************/
package org.datanucleus.store.rdbms.request;

import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.datanucleus.ClassLoaderResolver;
import org.datanucleus.ExecutionContext;
import org.datanucleus.exceptions.NucleusDataStoreException;
import org.datanucleus.exceptions.NucleusException;
import org.datanucleus.exceptions.NucleusOptimisticException;
import org.datanucleus.metadata.AbstractClassMetaData;
import org.datanucleus.metadata.AbstractMemberMetaData;
import org.datanucleus.metadata.ColumnMetaData;
import org.datanucleus.metadata.IdentityType;
import org.datanucleus.metadata.VersionMetaData;
import org.datanucleus.metadata.VersionStrategy;
import org.datanucleus.state.ObjectProvider;
import org.datanucleus.store.VersionHelper;
import org.datanucleus.store.connection.ManagedConnection;
import org.datanucleus.store.exceptions.NotYetFlushedException;
import org.datanucleus.store.fieldmanager.FieldManager;
import org.datanucleus.store.rdbms.RDBMSStoreManager;
import org.datanucleus.store.rdbms.SQLController;
import org.datanucleus.store.rdbms.fieldmanager.OldValueParameterSetter;
import org.datanucleus.store.rdbms.identifier.DatastoreIdentifier;
import org.datanucleus.store.rdbms.mapping.MappingCallbacks;
import org.datanucleus.store.rdbms.mapping.MappingConsumer;
import org.datanucleus.store.rdbms.mapping.StatementClassMapping;
import org.datanucleus.store.rdbms.mapping.StatementMappingIndex;
import org.datanucleus.store.rdbms.mapping.datastore.AbstractDatastoreMapping;
import org.datanucleus.store.rdbms.mapping.java.JavaTypeMapping;
import org.datanucleus.store.rdbms.table.Column;
import org.datanucleus.store.rdbms.table.DatastoreClass;
import org.datanucleus.util.Localiser;
import org.datanucleus.util.NucleusLogger;
import org.datanucleus.util.StringUtils;

/**
 * Class to provide a means of update of records in a data store.
 * Extends basic request class implementing the execute method to do a JDBC update operation.
 */
public class UpdateRequest extends Request
{
    /** SQL statement for the update. */
    private final String updateStmt;

    /** SQL statement for the update when using optimistic txns. */
    private final String updateStmtOptimistic;

    /** callback mappings will have their postUpdate method called after the update */
    private final MappingCallbacks[] callbacks;
    
    /** the index for the expression in the update sql statement. */
    private StatementMappingDefinition stmtMappingDefinition;

    /** Numbers of all fields to be updated (except PK). */
    private final int[] updateFieldNumbers;

    /** Numbers of WHERE clause fields. */
    private final int[] whereFieldNumbers;

    /** MetaData for the class. */
    protected AbstractClassMetaData cmd = null;

    /** MetaData for the version handling. */
    protected VersionMetaData versionMetaData = null;

    /** Whether we should make checks on optimistic version before updating. */
    protected boolean versionChecks = false;

    /**
     * Constructor, taking the table. Uses the structure of the datastore
     * table to build a basic query. The query will be of the form
     *      * UPDATE table-name SET param1=?,param2=? WHERE id1=? AND id2=?
     *
     *or (when also performing version checks)
     *      * UPDATE table-name SET param1=?,param2=?,version={newvers} WHERE id1=? AND id2=? AND version={oldvers}
     *
     *
     * @param table The Class Table representing the datastore table to update
     * @param reqFieldMetaData MetaData of the fields to update
     * @param cmd ClassMetaData of objects being updated
     * @param clr ClassLoader resolver
     */
    public UpdateRequest(DatastoreClass table, AbstractMemberMetaData[] reqFieldMetaData, AbstractClassMetaData cmd, ClassLoaderResolver clr)
    {
        super(table);

        this.cmd = cmd;
        versionMetaData = table.getVersionMetaData();
        if (versionMetaData != null && versionMetaData.getVersionStrategy() != VersionStrategy.NONE)
        {
            // Only apply a version check if we have a strategy defined
            versionChecks = true;
        }

        // Set up the basic mapping information
        stmtMappingDefinition = new StatementMappingDefinition(); // Populated using the subsequent lines
        UpdateMappingConsumer consumer = new UpdateMappingConsumer(cmd);

        // Fields to update
        if (versionMetaData != null)
        {
            if (versionMetaData.getFieldName() != null)
            {
                // Version field
                // TODO If the passed fields arent included in the statement (e.g SCO collection) update version?
                AbstractMemberMetaData[] updateFmds = new AbstractMemberMetaData[reqFieldMetaData.length + 1];
                for (int i=0;i 0)
                    {
                        fieldStr.append(",");
                    }
                    fieldStr.append(cmd.getMetaDataForManagedMemberAtAbsolutePosition(updateFieldNumbers[i]).getName());
                }

                if (versionMetaData != null && versionMetaData.getFieldName() == null)
                {
                    if (fieldStr.length() > 0)
                    {
                        fieldStr.append(",");
                    }
                    fieldStr.append("[VERSION]");
                }

                // Debug information about what we are updating
                NucleusLogger.PERSISTENCE.debug(Localiser.msg("052214", 
                    op.getObjectAsPrintable(), fieldStr.toString(), table));
            }

            RDBMSStoreManager storeMgr = table.getStoreManager();

            boolean batch = false;
            // TODO Set the batch flag based on whether we have no other SQL being invoked in here just our UPDATE
            try
            {
                ManagedConnection mconn = storeMgr.getConnection(ec);
                SQLController sqlControl = storeMgr.getSQLController();

                try
                {
                    // Perform the update
                    PreparedStatement ps = sqlControl.getStatementForUpdate(mconn, stmt, batch);
                    try
                    {
                        Object currentVersion = op.getTransactionalVersion();
                        Object nextVersion = null;
                        if (versionMetaData != null)
                        {
                            // Set the next version in the object
                            if (versionMetaData.getFieldName() != null)
                            {
                                // Version field
                                AbstractMemberMetaData verfmd = cmd.getMetaDataForMember(table.getVersionMetaData().getFieldName());
                                if (currentVersion instanceof Number)
                                {
                                    // Cater for Integer-based versions
                                    currentVersion = Long.valueOf(((Number)currentVersion).longValue());
                                }
                                nextVersion = VersionHelper.getNextVersion(versionMetaData.getVersionStrategy(), currentVersion);
                                if (verfmd.getType() == Integer.class || verfmd.getType() == int.class)
                                {
                                    // Cater for Integer-based versions TODO Generalise this
                                    nextVersion = Integer.valueOf(((Long)nextVersion).intValue());
                                }
                                op.replaceField(verfmd.getAbsoluteFieldNumber(), nextVersion);
                            }
                            else
                            {
                                // Surrogate version column
                                nextVersion = VersionHelper.getNextVersion(versionMetaData.getVersionStrategy(), currentVersion);
                            }
                            op.setTransactionalVersion(nextVersion);
                        }

                        // SELECT clause - set the required fields to be updated
                        if (updateFieldNumbers != null)
                        {
                            StatementClassMapping mappingDefinition = new StatementClassMapping();
                            StatementMappingIndex[] idxs = stmtMappingDefinition.getUpdateFields();
                            for (int i=0;i
     * UPDATE table-name SET param1=?,param2=? WHERE id1=? AND id2=?
     *


* or (when also performing version checks)
*      * UPDATE table-name SET param1=?,param2=?,version={newvers} WHERE id1=? AND id2=? AND version={oldvers}
     * 
*/
private class UpdateMappingConsumer implements MappingConsumer
{
/** Flag for initialisation state of the consumer. */
boolean initialized = false;
/** Current parameter index. */
int paramIndex = 1;
/** Numbers of all fields to be updated. */
List updateFields = new ArrayList();
/** Numbers of all WHERE clause fields. */
List whereFields = new ArrayList();
List mc = new ArrayList();
/** for UPDATE statement **/
StringBuilder columnAssignments = new StringBuilder();
Map assignedColumns = new HashMap();
/** Where clause for the statement. Built during the consumption process. */
StringBuilder where = new StringBuilder();
/** MetaData for the class of the object */
private final AbstractClassMetaData cmd;
private boolean whereClauseConsumption = false;
/**
* Constructor
* @param clr the ClassLoaderResolver
*/
public UpdateMappingConsumer(AbstractClassMetaData cmd)
{
super();
this.cmd = cmd;
}
public void setWhereClauseConsumption(boolean whereClause)
{
this.whereClauseConsumption = whereClause;
}
public void preConsumeMapping(int highest)
{
if (!initialized)
{
stmtMappingDefinition.setWhereFields(new StatementMappingIndex[highest]);
stmtMappingDefinition.setUpdateFields(new StatementMappingIndex[highest]);
initialized = true;
}
}
/**
* Consumes a mapping for a field.
* @param m The mapping.
* @param mmd MetaData for the field
*/
public void consumeMapping(JavaTypeMapping m, AbstractMemberMetaData fmd)
{
if (!fmd.getAbstractClassMetaData().isSameOrAncestorOf(cmd))
{
return;
}
if (m.includeInUpdateStatement())
{
// Check if the field is "updatable" (either using JPA column, or JDO extension)
if (fmd.hasExtension("updateable") && fmd.getValueForExtension("updateable").equalsIgnoreCase("false"))
{
return;
}
ColumnMetaData[] colmds = fmd.getColumnMetaData();
if (colmds != null && colmds.length > 0)
{
for (int i=0;i 0)
{
where.append(" AND ");
}
where.append(m.getDatastoreMapping(0).getColumn().getIdentifier());
where.append("=");
where.append(((AbstractDatastoreMapping)m.getDatastoreMapping(0)).getUpdateInputParameter());
}
else
{
stmtMappingDefinition.getWhereFields()[fmd.getAbsoluteFieldNumber()] = sei;
for (int j=0; j 0)
{
where.append(" AND ");
}
where.append(m.getDatastoreMapping(j).getColumn().getIdentifier());
where.append("=");
where.append(((AbstractDatastoreMapping)m.getDatastoreMapping(j)).getUpdateInputParameter());
if (!whereFields.contains(abs_field_num))
{
whereFields.add(abs_field_num);
}
parametersIndex[j] = paramIndex++;
}
}
}
else
{
// Update fields
stmtMappingDefinition.getUpdateFields()[fmd.getAbsoluteFieldNumber()] = sei;
for (int j = 0; j < parametersIndex.length; j++)
{
// check if the column was not already assigned
Column c = m.getDatastoreMapping(j).getColumn();
DatastoreIdentifier columnId = c.getIdentifier();
boolean columnExists = assignedColumns.containsKey(columnId.toString());
if (columnExists)
{
parametersIndex[j] = ((Integer)assignedColumns.get(columnId.toString())).intValue();
}
String param = ((AbstractDatastoreMapping)m.getDatastoreMapping(j)).getUpdateInputParameter();
if (!columnExists)
{
if (columnAssignments.length() > 0)
{
columnAssignments.append(",");
}
columnAssignments.append(columnId).append("=").append(param);
}
if (param.indexOf("?") > -1)
{
// only add fields to be replaced by the real values only if the param value has ?
if (!updateFields.contains(abs_field_num))
{
updateFields.add(abs_field_num);
}
parametersIndex[j] = paramIndex++;
}
if (!columnExists)
{
assignedColumns.put(columnId.toString(), Integer.valueOf(fmd.getAbsoluteFieldNumber()));
}
}
}
}
if (m instanceof MappingCallbacks)
{
mc.add(m);
}
}
/**
* Consumes a mapping associated to "special" columns.
* @param m The mapping.
* @param mappingType the Mapping type
*/
public void consumeMapping(JavaTypeMapping m, int mappingType)
{
if (mappingType == MappingConsumer.MAPPING_TYPE_VERSION)
{
// Surrogate version column
String inputParam = ((AbstractDatastoreMapping)m.getDatastoreMapping(0)).getUpdateInputParameter();
if (whereClauseConsumption)
{
if (where.length() > 0)
{
where.append(" AND ");
}
where.append(m.getDatastoreMapping(0).getColumn().getIdentifier());
where.append("=");
where.append(inputParam);
StatementMappingIndex versStmtIdx = new StatementMappingIndex(m);
versStmtIdx.addParameterOccurrence(new int[]{paramIndex++});
stmtMappingDefinition.setWhereVersion(versStmtIdx);
}
else
{
String condition = m.getDatastoreMapping(0).getColumn().getIdentifier() + "=" + inputParam;
if (columnAssignments.length() > 0)
{
columnAssignments.append(", ");
}
columnAssignments.append(condition);
StatementMappingIndex versStmtIdx = new StatementMappingIndex(m);
versStmtIdx.addParameterOccurrence(new int[]{paramIndex++});
stmtMappingDefinition.setUpdateVersion(versStmtIdx);
}
}
else if (mappingType == MappingConsumer.MAPPING_TYPE_DATASTORE_ID)
{
// Surrogate datastore-id column
if (where.length() > 0)
{
where.append(" AND ");
}
where.append(key.getColumns().get(0).getIdentifier());
where.append("=");
where.append(((AbstractDatastoreMapping)m.getDatastoreMapping(0)).getUpdateInputParameter());
StatementMappingIndex datastoreIdIdx = new StatementMappingIndex(m);
datastoreIdIdx.addParameterOccurrence(new int[]{paramIndex++});
stmtMappingDefinition.setWhereDatastoreId(datastoreIdIdx);
}
}
/**
* Consumer a column without mapping.
* @param col Column
*/
public void consumeUnmappedColumn(Column col)
{
// Do nothing since we don't handle unmapped columns
}
/**
* @return Returns the mappingCallbacks.
*/
public List getMappingCallbacks()
{
return mc;
}
/**
* Accessor for the numbers of fields to be updated (excluding PK fields).
* @return array of absolute field numbers
*/
public int[] getUpdateFieldNumbers()
{
int[] fieldNumbers = new int[updateFields.size()];
for (int i = 0; i < updateFields.size(); ++i)
{
fieldNumbers[i] = ((Integer) updateFields.get(i)).intValue();
}
return fieldNumbers;
}
/**
* Accessor for the numbers of fields in the WHERE clause.
* @return array of absolute WHERE clause field numbers
*/
public int[] getWhereFieldNumbers()
{
int[] fieldNumbers = new int[whereFields.size()];
for (int i = 0; i < whereFields.size(); i++)
{
fieldNumbers[i] = ((Integer) whereFields.get(i)).intValue();
}
return fieldNumbers;
}
/**
* Accessor for the basic update SQL statement.
*          * UPDATE TABLE SET COL1 = ?, COL2 = ? WHERE COL3 = ? AND COL4 = ? 
         * 
* @return The update SQL statement
*/
public String getStatement()
{
if (columnAssignments.length() < 1)
{
return null;
}
return "UPDATE " + table.toString() + " SET " + columnAssignments + " WHERE " + where;
}
}
}