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Cayenne Object Persistence Framework
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* 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.
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package org.apache.cayenne.dba.openbase;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.Types;
import java.util.Iterator;
import org.apache.log4j.Logger;
import org.apache.cayenne.CayenneRuntimeException;
import org.apache.cayenne.access.DataNode;
import org.apache.cayenne.access.trans.QualifierTranslator;
import org.apache.cayenne.access.trans.QueryAssembler;
import org.apache.cayenne.access.types.CharType;
import org.apache.cayenne.access.types.DefaultType;
import org.apache.cayenne.access.types.ExtendedTypeMap;
import org.apache.cayenne.dba.JdbcAdapter;
import org.apache.cayenne.dba.PkGenerator;
import org.apache.cayenne.dba.TypesMapping;
import org.apache.cayenne.map.DbAttribute;
import org.apache.cayenne.map.DbEntity;
import org.apache.cayenne.map.DbJoin;
import org.apache.cayenne.map.DbRelationship;
import org.apache.cayenne.map.DerivedDbEntity;
import org.apache.cayenne.query.Query;
import org.apache.cayenne.query.SQLAction;
/**
* DbAdapter implementation for OpenBase.
* Sample connection
* settings to use with OpenBase are shown below:
*
test-openbase.cayenne.adapter = org.apache.cayenne.dba.openbase.OpenBaseAdapter
test-openbase.jdbc.username = test
test-openbase.jdbc.password = secret
test-openbase.jdbc.url = jdbc:openbase://serverhostname/cayenne
test-openbase.jdbc.driver = com.openbase.jdbc.ObDriver
*
* @author Mike Kienenberger
* @author Andrei Adamchik
*
* @since 1.1
*/
public class OpenBaseAdapter extends JdbcAdapter {
private static Logger logObj = Logger.getLogger(OpenBaseAdapter.class);
public OpenBaseAdapter() {
// init defaults
this.setSupportsUniqueConstraints(false);
}
/**
* Uses special action builder to create the right action.
*
* @since 1.2
*/
public SQLAction getAction(Query query, DataNode node) {
return query.createSQLAction(new OpenBaseActionBuilder(this, node
.getEntityResolver()));
}
protected void configureExtendedTypes(ExtendedTypeMap map) {
super.configureExtendedTypes(map);
// Byte handling doesn't work on read...
// need special converter
map.registerType(new OpenBaseByteType());
map.registerType(new OpenBaseCharType());
}
public DbAttribute buildAttribute(
String name,
String typeName,
int type,
int size,
int precision,
boolean allowNulls) {
// OpenBase makes no distinction between CHAR and VARCHAR
// so lets use VARCHAR, since it seems more generic
if (type == Types.CHAR) {
type = Types.VARCHAR;
}
return super.buildAttribute(name, typeName, type, size, precision, allowNulls);
}
/**
* Returns word "go".
*/
public String getBatchTerminator() {
return "go";
}
/**
* Returns null, since views are not yet supported in openbase.
*/
public String tableTypeForView() {
// TODO: according to OpenBase docs views *ARE* supported.
return null;
}
/**
* Returns OpenBase-specific translator for queries.
*/
public QualifierTranslator getQualifierTranslator(QueryAssembler queryAssembler) {
return new OpenBaseQualifierTranslator(queryAssembler);
}
/**
* Creates and returns a primary key generator. Overrides superclass
* implementation to return an
* instance of OpenBasePkGenerator that uses built-in multi-server primary key generation.
*/
protected PkGenerator createPkGenerator() {
return new OpenBasePkGenerator();
}
/**
* Returns a SQL string that can be used to create database table
* corresponding to ent parameter.
*/
public String createTable(DbEntity ent) {
// later we may support view creation
// for derived DbEntities
if (ent instanceof DerivedDbEntity) {
throw new CayenneRuntimeException(
"Can't create table for derived DbEntity '" + ent.getName() + "'.");
}
StringBuffer buf = new StringBuffer();
buf.append("CREATE TABLE ").append(ent.getFullyQualifiedName()).append(" (");
// columns
Iterator it = ent.getAttributes().iterator();
boolean first = true;
while (it.hasNext()) {
if (first) {
first = false;
}
else {
buf.append(", ");
}
DbAttribute at = (DbAttribute) it.next();
// attribute may not be fully valid, do a simple check
if (at.getType() == TypesMapping.NOT_DEFINED) {
throw new CayenneRuntimeException(
"Undefined type for attribute '"
+ ent.getFullyQualifiedName()
+ "."
+ at.getName()
+ "'.");
}
String[] types = externalTypesForJdbcType(at.getType());
if (types == null || types.length == 0) {
throw new CayenneRuntimeException(
"Undefined type for attribute '"
+ ent.getFullyQualifiedName()
+ "."
+ at.getName()
+ "': "
+ at.getType());
}
String type = types[0];
buf.append(at.getName()).append(' ').append(type);
// append size and precision (if applicable)
if (TypesMapping.supportsLength(at.getType())) {
int len = at.getMaxLength();
int prec = TypesMapping.isDecimal(at.getType()) ? at.getPrecision() : -1;
// sanity check
if (prec > len) {
prec = -1;
}
if (len > 0) {
buf.append('(').append(len);
if (prec >= 0) {
buf.append(", ").append(prec);
}
buf.append(')');
}
}
if (at.isMandatory()) {
buf.append(" NOT NULL");
}
else {
buf.append(" NULL");
}
}
buf.append(')');
return buf.toString();
}
/**
* Returns a SQL string that can be used to create
* a foreign key constraint for the relationship.
*/
public String createFkConstraint(DbRelationship rel) {
StringBuffer buf = new StringBuffer();
// OpendBase Specifics is that we need to create a constraint going
// from destination to source for this to work...
DbEntity sourceEntity = (DbEntity) rel.getSourceEntity();
DbEntity targetEntity = (DbEntity) rel.getTargetEntity();
String toMany = (!rel.isToMany()) ? "'1'" : "'0'";
// TODO: doesn't seem like OpenBase supports compound joins...
// need to doublecheck that
int joinsLen = rel.getJoins().size();
if (joinsLen == 0) {
throw new CayenneRuntimeException(
"Relationship has no joins: " + rel.getName());
}
else if (joinsLen > 1) {
logObj.warn(
"Only a single join relationships are supported by OpenBase. Ignoring extra joins.");
}
DbJoin join = (DbJoin) rel.getJoins().get(0);
buf
.append("INSERT INTO _SYS_RELATIONSHIP (")
.append("dest_table, dest_column, source_table, source_column, ")
.append("block_delete, cascade_delete, one_to_many, operator, relationshipName")
.append(") VALUES ('")
.append(sourceEntity.getFullyQualifiedName())
.append("', '")
.append(join.getSourceName())
.append("', '")
.append(targetEntity.getFullyQualifiedName())
.append("', '")
.append(join.getTargetName())
.append("', 0, 0, ")
.append(toMany)
.append(", '=', '")
.append(rel.getName())
.append("')");
return buf.toString();
}
// OpenBase JDBC driver has trouble reading "integer" as byte
// this converter addresses such problem
static class OpenBaseByteType extends DefaultType {
OpenBaseByteType() {
super(Byte.class.getName());
}
public Object materializeObject(ResultSet rs, int index, int type)
throws Exception {
// read value as int, and then narrow it down
int val = rs.getInt(index);
return (rs.wasNull()) ? null : new Byte((byte) val);
}
}
static class OpenBaseCharType extends CharType {
OpenBaseCharType() {
super(false, true);
}
public void setJdbcObject(
PreparedStatement st,
Object val,
int pos,
int type,
int precision)
throws Exception {
// These to types map to "text"; and when setting "text" as object
// OB assumes that the object is the actual CLOB... weird
if (type == Types.CLOB || type == Types.LONGVARCHAR) {
st.setString(pos, (String) val);
}
else {
super.setJdbcObject(st, val, pos, type, precision);
}
}
}
}
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