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org.apache.openjpa.jdbc.meta.strats.MaxEmbeddedLobFieldStrategy Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.
*/
package org.apache.openjpa.jdbc.meta.strats;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import org.apache.openjpa.jdbc.identifier.DBIdentifier;
import org.apache.openjpa.jdbc.kernel.EagerFetchModes;
import org.apache.openjpa.jdbc.kernel.JDBCFetchConfiguration;
import org.apache.openjpa.jdbc.kernel.JDBCStore;
import org.apache.openjpa.jdbc.meta.JavaSQLTypes;
import org.apache.openjpa.jdbc.meta.ValueMappingInfo;
import org.apache.openjpa.jdbc.schema.Column;
import org.apache.openjpa.jdbc.sql.DBDictionary;
import org.apache.openjpa.jdbc.sql.Joins;
import org.apache.openjpa.jdbc.sql.Result;
import org.apache.openjpa.jdbc.sql.Row;
import org.apache.openjpa.jdbc.sql.RowManager;
import org.apache.openjpa.jdbc.sql.SQLBuffer;
import org.apache.openjpa.jdbc.sql.Select;
import org.apache.openjpa.kernel.OpenJPAStateManager;
import org.apache.openjpa.meta.JavaTypes;
/**
* Base class for LOBs on databases that limit the max embedded LOB size.
*
* @author Abe White
* @since 0.4.0
*/
abstract class MaxEmbeddedLobFieldStrategy
extends HandlerFieldStrategy {
private static final long serialVersionUID = 1L;
/**
* Return the expected type of the field from {@link JavaTypes} or
* {@link JavaSQLTypes}.
*/
protected abstract int getExpectedJavaType();
/**
* Set the value of the owning field into the given row.
*/
protected abstract void update(OpenJPAStateManager sm, Row row)
throws SQLException;
/**
* Return whether this is a custom insert/update.
*/
protected abstract Boolean isCustom(OpenJPAStateManager sm,
JDBCStore store);
/**
* Set the data from the given state manager into the result set.
*/
protected abstract void putData(OpenJPAStateManager sm, ResultSet rs,
DBDictionary dict)
throws SQLException;
@Override
public void map(boolean adapt) {
assertNotMappedBy();
// map join key, if any
field.mapJoin(adapt, false);
field.getKeyMapping().getValueInfo().assertNoSchemaComponents
(field.getKey(), !adapt);
field.getElementMapping().getValueInfo().assertNoSchemaComponents
(field.getElement(), !adapt);
ValueMappingInfo vinfo = field.getValueInfo();
vinfo.assertNoJoin(field, true);
vinfo.assertNoForeignKey(field, !adapt);
DBDictionary dict = field.getMappingRepository().getDBDictionary();
DBIdentifier fieldName = DBIdentifier.newColumn(field.getName(), dict != null ? dict.delimitAll() : false);
// get value columns
Column tmpCol = new Column();
tmpCol.setIdentifier(fieldName);
tmpCol.setJavaType(getExpectedJavaType());
tmpCol.setSize(-1);
_cols = vinfo.getColumns(field, fieldName,
new Column[]{ tmpCol }, field.getTable(), adapt);
_io = vinfo.getColumnIO();
if (_io == null)
_io = field.getColumnIO();
field.setColumns(_cols);
field.setColumnIO(_io);
field.mapConstraints(fieldName, adapt);
field.mapPrimaryKey(adapt);
}
@Override
public Boolean isCustomInsert(OpenJPAStateManager sm, JDBCStore store) {
if (!field.getColumnIO().isInsertable(0, false))
return Boolean.FALSE;
return isCustom(sm, store);
}
@Override
public Boolean isCustomUpdate(OpenJPAStateManager sm, JDBCStore store) {
if (!field.getColumnIO().isUpdatable(0, false))
return Boolean.FALSE;
return isCustom(sm, store);
}
@Override
public void insert(OpenJPAStateManager sm, JDBCStore store, RowManager rm)
throws SQLException {
if (!field.getColumnIO().isInsertable(0, false))
return;
Row row = field.getRow(sm, store, rm, Row.ACTION_INSERT);
if (row != null)
update(sm, row);
}
@Override
public void update(OpenJPAStateManager sm, JDBCStore store, RowManager rm)
throws SQLException {
if (!field.getColumnIO().isUpdatable(0, false))
return;
Row row = field.getRow(sm, store, rm, Row.ACTION_UPDATE);
if (row != null)
update(sm, row);
}
@Override
public void delete(OpenJPAStateManager sm, JDBCStore store, RowManager rm)
throws SQLException {
field.deleteRow(sm, store, rm);
}
@Override
public void customInsert(OpenJPAStateManager sm, JDBCStore store)
throws SQLException {
customUpdate(sm, store);
}
@Override
public void customUpdate(OpenJPAStateManager sm, JDBCStore store)
throws SQLException {
JDBCFetchConfiguration fetch = store.getFetchConfiguration();
// select existing value for update
Column col = field.getColumns()[0];
Select sel = store.getSQLFactory().newSelect();
sel.select(col);
field.wherePrimaryKey(sel, sm, store);
SQLBuffer sql = sel.toSelect(true, fetch);
Connection conn = store.getConnection();
DBDictionary dict = store.getDBDictionary();
PreparedStatement stmnt = null;
ResultSet rs = null;
try {
stmnt = sql.prepareStatement(conn,
ResultSet.TYPE_SCROLL_INSENSITIVE,
ResultSet.CONCUR_UPDATABLE);
dict.setTimeouts(stmnt, fetch, true);
rs = stmnt.executeQuery();
rs.next();
putData(sm, rs, store.getDBDictionary());
} finally {
if (rs != null)
try {
rs.close();
} catch (SQLException se) {
}
if (stmnt != null)
try {
stmnt.close();
} catch (SQLException se) {
}
try {
conn.close();
} catch (SQLException se) {
}
}
}
@Override
public int supportsSelect(Select sel, int type, OpenJPAStateManager sm,
JDBCStore store, JDBCFetchConfiguration fetch) {
if (type == Select.TYPE_JOINLESS && sel.isSelected(field.getTable()))
return 1;
return 0;
}
@Override
public int select(Select sel, OpenJPAStateManager sm, JDBCStore store,
JDBCFetchConfiguration fetch, int eagerMode) {
if (sel.isDistinct() ||
eagerMode == EagerFetchModes.EAGER_NONE)
return -1;
sel.select(field.getColumns()[0], field.join(sel));
return 1;
}
@Override
public void load(OpenJPAStateManager sm, JDBCStore store,
JDBCFetchConfiguration fetch, Result res)
throws SQLException {
Column col = field.getColumns()[0];
if (res.contains(col))
sm.store(field.getIndex(), load(col, res, null));
}
@Override
public void load(OpenJPAStateManager sm, JDBCStore store,
JDBCFetchConfiguration fetch)
throws SQLException {
Column col = field.getColumns()[0];
Select sel = store.getSQLFactory().newSelect();
sel.select(col);
field.wherePrimaryKey(sel, sm, store);
Result res = sel.execute(store, fetch);
Object val = null;
try {
if (res.next())
val = load(col, res, null);
} finally {
res.close();
}
sm.store(field.getIndex(), val);
}
/**
* Load this value from the given result.
*/
protected Object load(Column col, Result res, Joins joins)
throws SQLException {
return res.getObject(col, null, joins);
}
@Override
public Joins join(Joins joins, boolean forceOuter) {
return field.join(joins, forceOuter, false);
}
@Override
public Object loadProjection(JDBCStore store, JDBCFetchConfiguration fetch,
Result res, Joins joins)
throws SQLException {
return load(field.getColumns()[0], res, joins);
}
@Override
public boolean isVersionable() {
return false;
}
@Override
public void where(OpenJPAStateManager sm, JDBCStore store, RowManager rm,
Object prevValue)
throws SQLException {
}
protected abstract Object getValue(OpenJPAStateManager sm);
}
