use of org.datanucleus.store.rdbms.table.DatastoreElementContainer in project datanucleus-rdbms by datanucleus.
the class SQLStatementHelper method selectMemberOfSourceInStatement.
/**
* Method to select the specified member (field/property) of the source table in the passed SQL
* statement. This populates the mappingDefinition with the column details for this member.
* @param stmt The SQL statement
* @param mappingDefinition Mapping definition for the results (will be populated by any
* selected mappings if provided as input)
* @param fetchPlan FetchPlan
* @param sourceSqlTbl Table that has the member (or a super-table/secondary-table of this table)
* @param mmd Meta-data for the field/property in the source that we are selecting
* @param clr ClassLoader resolver
* @param maxFetchPlanLimit Max fetch depth from this point to select (0 implies no other objects)
* @param inputJoinType Optional join type to use for subobjects (otherwise decide join type internally)
*/
public static void selectMemberOfSourceInStatement(SelectStatement stmt, StatementClassMapping mappingDefinition, FetchPlan fetchPlan, SQLTable sourceSqlTbl, AbstractMemberMetaData mmd, ClassLoaderResolver clr, int maxFetchPlanLimit, JoinType inputJoinType) {
boolean selectSubobjects = false;
if (maxFetchPlanLimit > 0) {
selectSubobjects = true;
}
// Set table-group name for any related object we join to (naming based on member name)
String tableGroupName = sourceSqlTbl.getGroupName() + "." + mmd.getName();
JavaTypeMapping m = sourceSqlTbl.getTable().getMemberMapping(mmd);
if (m != null && m.includeInFetchStatement()) {
RelationType relationType = mmd.getRelationType(clr);
RDBMSStoreManager storeMgr = stmt.getRDBMSManager();
DatastoreAdapter dba = storeMgr.getDatastoreAdapter();
if (!dba.validToSelectMappingInStatement(stmt, m)) {
// Not valid to select this mapping for this statement so return
return;
}
MetaDataManager mmgr = storeMgr.getMetaDataManager();
StatementMappingIndex stmtMapping = new StatementMappingIndex(m);
if (m.getNumberOfDatastoreMappings() > 0) {
// Select of fields with columns in source table(s)
// Adds inner/outer join to any required superclass/secondary tables
SQLTable sqlTbl = SQLStatementHelper.getSQLTableForMappingOfTable(stmt, sourceSqlTbl, m);
boolean selectFK = true;
if (selectSubobjects && (relationType == RelationType.ONE_TO_ONE_UNI || (relationType == RelationType.ONE_TO_ONE_BI && mmd.getMappedBy() == null)) && !mmd.isSerialized() && !mmd.isEmbedded()) {
// Related object with FK at this side
selectFK = selectFetchPlanFieldsOfFKRelatedObject(stmt, mappingDefinition, fetchPlan, sourceSqlTbl, mmd, clr, maxFetchPlanLimit, m, tableGroupName, stmtMapping, sqlTbl, inputJoinType);
} else if (selectSubobjects && (!mmd.isEmbedded() && !mmd.isSerialized()) && relationType == RelationType.MANY_TO_ONE_BI) {
AbstractMemberMetaData[] relatedMmds = mmd.getRelatedMemberMetaData(clr);
if (mmd.getJoinMetaData() != null || relatedMmds[0].getJoinMetaData() != null) {
// N-1 bidirectional join table relation
// TODO Add left outer join from {sourceTable}.ID to {joinTable}.ELEM_FK
Table joinTable = storeMgr.getTable(relatedMmds[0]);
DatastoreElementContainer collTable = (DatastoreElementContainer) joinTable;
JavaTypeMapping selectMapping = collTable.getOwnerMapping();
SQLTable joinSqlTbl = null;
if (stmt.getPrimaryTable().getTable() != joinTable) {
// Join to the join table
JavaTypeMapping referenceMapping = collTable.getElementMapping();
joinSqlTbl = stmt.join(JoinType.LEFT_OUTER_JOIN, sourceSqlTbl, sourceSqlTbl.getTable().getIdMapping(), collTable, null, referenceMapping, null, tableGroupName, true);
} else {
// Main table of the statement is the join table so no need to join
joinSqlTbl = stmt.getPrimaryTable();
}
// Select the owner mapping of the join table
int[] colNumbers = stmt.select(joinSqlTbl, selectMapping, null);
stmtMapping.setColumnPositions(colNumbers);
// TODO Join to 1 side from join table?
} else {
// N-1 bidirectional FK relation
// Related object with FK at this side, so join/select related object as required
selectFK = selectFetchPlanFieldsOfFKRelatedObject(stmt, mappingDefinition, fetchPlan, sourceSqlTbl, mmd, clr, maxFetchPlanLimit, m, tableGroupName, stmtMapping, sqlTbl, inputJoinType);
}
}
if (selectFK) {
int[] colNumbers = stmt.select(sqlTbl, m, null);
stmtMapping.setColumnPositions(colNumbers);
}
} else {
// Select of related objects with FK in other table
if (relationType == RelationType.ONE_TO_ONE_BI && mmd.getMappedBy() != null) {
// 1-1 bidirectional relation with FK in related table
AbstractMemberMetaData[] relatedMmds = mmd.getRelatedMemberMetaData(clr);
AbstractMemberMetaData relatedMmd = relatedMmds[0];
String[] clsNames = null;
if (mmd.getType().isInterface()) {
if (mmd.getFieldTypes() != null && mmd.getFieldTypes().length == 1) {
// Use field-type since only one class specified
Class fldTypeCls = clr.classForName(mmd.getFieldTypes()[0]);
if (fldTypeCls.isInterface()) {
// User has specified an interface, so find its implementations
clsNames = mmgr.getClassesImplementingInterface(mmd.getFieldTypes()[0], clr);
} else {
// Use user-provided field-type
clsNames = new String[] { mmd.getFieldTypes()[0] };
}
}
if (clsNames == null) {
clsNames = mmgr.getClassesImplementingInterface(mmd.getTypeName(), clr);
}
} else {
String typeName = mmd.isSingleCollection() ? mmd.getCollection().getElementType() : mmd.getTypeName();
clsNames = new String[] { typeName };
}
DatastoreClass relatedTbl = storeMgr.getDatastoreClass(clsNames[0], clr);
JavaTypeMapping relatedMapping = relatedTbl.getMemberMapping(relatedMmd);
JavaTypeMapping relatedDiscrimMapping = relatedTbl.getSurrogateMapping(SurrogateColumnType.DISCRIMINATOR, true);
Object[] discrimValues = null;
JavaTypeMapping relatedTypeMapping = null;
AbstractClassMetaData relatedCmd = relatedMmd.getAbstractClassMetaData();
if (relatedDiscrimMapping != null && (relatedCmd.getSuperAbstractClassMetaData() != null || !relatedCmd.getFullClassName().equals(mmd.getTypeName()))) {
// Related table has a discriminator and the field can store other types
List discValueList = null;
for (String clsName : clsNames) {
List values = getDiscriminatorValuesForMember(clsName, relatedDiscrimMapping, storeMgr, clr);
if (discValueList == null) {
discValueList = values;
} else {
discValueList.addAll(values);
}
}
if (discValueList != null) {
discrimValues = discValueList.toArray(new Object[discValueList.size()]);
}
} else if (relatedTbl != relatedMapping.getTable()) {
// The relation is to a base class table, and the type stored is a sub-class
relatedTypeMapping = relatedTbl.getIdMapping();
}
SQLTable relatedSqlTbl = null;
if (relatedTypeMapping == null) {
// Join the 1-1 relation
JoinType joinType = getJoinTypeForOneToOneRelationJoin(sourceSqlTbl.getTable().getIdMapping(), sourceSqlTbl, inputJoinType);
if (joinType == JoinType.LEFT_OUTER_JOIN || joinType == JoinType.RIGHT_OUTER_JOIN) {
inputJoinType = joinType;
}
relatedSqlTbl = addJoinForOneToOneRelation(stmt, sourceSqlTbl.getTable().getIdMapping(), sourceSqlTbl, relatedMapping, relatedTbl, null, discrimValues, tableGroupName, joinType);
// Select the id mapping in the related table
int[] colNumbers = stmt.select(relatedSqlTbl, relatedTbl.getIdMapping(), null);
stmtMapping.setColumnPositions(colNumbers);
} else {
DatastoreClass relationTbl = (DatastoreClass) relatedMapping.getTable();
if (relatedTbl != relatedMapping.getTable()) {
if (relatedMapping.isNullable()) {
// Nullable - left outer join from {sourceTable}.ID to {relatedBaseTable}.FK
// and inner join from {relatedBaseTable}.ID to {relatedTable}.ID
// (joins the relation and restricts to the right type)
relatedSqlTbl = stmt.join(JoinType.LEFT_OUTER_JOIN, sourceSqlTbl, sourceSqlTbl.getTable().getIdMapping(), relatedMapping.getTable(), null, relatedMapping, null, tableGroupName, true);
relatedSqlTbl = stmt.join(JoinType.INNER_JOIN, relatedSqlTbl, relatedMapping.getTable().getIdMapping(), relatedTbl, null, relatedTbl.getIdMapping(), null, tableGroupName, true);
} else {
// Not nullable - inner join from {sourceTable}.ID to {relatedBaseTable}.FK
// and inner join from {relatedBaseTable}.ID to {relatedTable}.ID
// (joins the relation and restricts to the right type)
relatedSqlTbl = stmt.join(JoinType.INNER_JOIN, sourceSqlTbl, sourceSqlTbl.getTable().getIdMapping(), relatedMapping.getTable(), null, relatedMapping, null, tableGroupName, true);
relatedSqlTbl = stmt.join(JoinType.INNER_JOIN, relatedSqlTbl, relatedMapping.getTable().getIdMapping(), relatedTbl, null, relatedTbl.getIdMapping(), null, tableGroupName, true);
}
} else {
// Join the 1-1 relation
JoinType joinType = getJoinTypeForOneToOneRelationJoin(sourceSqlTbl.getTable().getIdMapping(), sourceSqlTbl, inputJoinType);
if (joinType == JoinType.LEFT_OUTER_JOIN || joinType == JoinType.RIGHT_OUTER_JOIN) {
inputJoinType = joinType;
}
relatedSqlTbl = addJoinForOneToOneRelation(stmt, sourceSqlTbl.getTable().getIdMapping(), sourceSqlTbl, relatedMapping, relationTbl, null, null, tableGroupName, joinType);
}
// Select the id mapping in the subclass of the related table
// Note this adds an inner join from relatedTable to its subclass
relatedSqlTbl = SQLStatementHelper.getSQLTableForMappingOfTable(stmt, relatedSqlTbl, relatedTbl.getIdMapping());
int[] colNumbers = stmt.select(relatedSqlTbl, relatedTbl.getIdMapping(), null);
stmtMapping.setColumnPositions(colNumbers);
}
if (selectSubobjects && !mmd.isSerialized() && !mmd.isEmbedded()) {
// Select the fetch-plan fields of the related object
StatementClassMapping subMappingDefinition = new StatementClassMapping(null, mmd.getName());
selectFetchPlanOfSourceClassInStatement(stmt, subMappingDefinition, fetchPlan, relatedSqlTbl, relatedMmd.getAbstractClassMetaData(), maxFetchPlanLimit - 1, inputJoinType);
if (mappingDefinition != null) {
mappingDefinition.addMappingDefinitionForMember(mmd.getAbsoluteFieldNumber(), subMappingDefinition);
}
}
} else if (relationType == RelationType.MANY_TO_ONE_BI) {
AbstractMemberMetaData[] relatedMmds = mmd.getRelatedMemberMetaData(clr);
if (mmd.getJoinMetaData() != null || relatedMmds[0].getJoinMetaData() != null) {
// N-1 bidirectional join table relation
// Add left outer join from {sourceTable}.ID to {joinTable}.ELEM_FK
Table joinTable = storeMgr.getTable(relatedMmds[0]);
DatastoreElementContainer collTable = (DatastoreElementContainer) joinTable;
JavaTypeMapping selectMapping = collTable.getOwnerMapping();
SQLTable joinSqlTbl = null;
if (stmt.getPrimaryTable().getTable() != joinTable) {
// Join to the join table
JavaTypeMapping referenceMapping = collTable.getElementMapping();
if (referenceMapping instanceof ReferenceMapping) {
// Join table has a reference mapping pointing to our table, so get the submapping for the implementation
ReferenceMapping refMap = (ReferenceMapping) referenceMapping;
Class implType = clr.classForName(mmd.getClassName(true));
referenceMapping = refMap.getJavaTypeMappingForType(implType);
}
joinSqlTbl = stmt.join(JoinType.LEFT_OUTER_JOIN, sourceSqlTbl, sourceSqlTbl.getTable().getIdMapping(), collTable, null, referenceMapping, null, tableGroupName + "_JOIN", true);
} else {
// Main table of the statement is the join table so no need to join
joinSqlTbl = stmt.getPrimaryTable();
}
// Select the owner mapping of the join table
int[] colNumbers = stmt.select(joinSqlTbl, selectMapping, null);
stmtMapping.setColumnPositions(colNumbers);
}
// TODO Select fetch plan fields of this related object
} else if (relationType == RelationType.MANY_TO_ONE_UNI) {
// Add left outer join from {sourceTable}.ID to {joinTable}.OWNER_FK
PersistableJoinTable joinTable = (PersistableJoinTable) storeMgr.getTable(mmd);
SQLTable joinSqlTbl = stmt.join(JoinType.LEFT_OUTER_JOIN, sourceSqlTbl, sourceSqlTbl.getTable().getIdMapping(), joinTable, null, joinTable.getOwnerMapping(), null, tableGroupName + "_JOIN", true);
int[] colNumbers = stmt.select(joinSqlTbl, joinTable.getRelatedMapping(), null);
stmtMapping.setColumnPositions(colNumbers);
// TODO Select fetch plan fields of this related object
}
}
if (mappingDefinition != null) {
mappingDefinition.addMappingForMember(mmd.getAbsoluteFieldNumber(), stmtMapping);
}
}
}
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