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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.
*/
package org.apache.openjpa.jdbc.sql;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import org.apache.openjpa.jdbc.kernel.JDBCFetchConfiguration;
import org.apache.openjpa.jdbc.kernel.JDBCStore;
import org.apache.openjpa.jdbc.meta.ClassMapping;
import org.apache.openjpa.jdbc.meta.FieldMapping;
import org.apache.openjpa.jdbc.schema.Column;
import org.apache.openjpa.jdbc.schema.ForeignKey;
import org.apache.openjpa.jdbc.schema.Table;
import org.apache.openjpa.kernel.exps.Value;
import org.apache.openjpa.kernel.exps.Context;
/**
* Abstraction of a SQL SELECT statement.
*
* @author Abe White
*/
public interface Select
extends SelectExecutor {
/**
* Constant indicating to batch the select using an inner join.
*/
public static final int EAGER_INNER = 0;
/**
* Constant indicating to batch the select using an outer join.
*/
public static final int EAGER_OUTER = 1;
/**
* Constant indicating to use a separate select executed in parallel.
*/
public static final int EAGER_PARALLEL = 2;
/**
* Constant indicating a select can be made without joins.
*/
public static final int TYPE_JOINLESS = 3;
/**
* Constant indicating a two-part select and load.
*/
public static final int TYPE_TWO_PART = 4;
/**
* Constant indicating to add conditions to the selcet to select this
* class and joinable subclasses only.
*/
public static final int SUBS_JOINABLE = 1;
/**
* Constant indicating to add conditions to the select to select this
* class only.
*/
public static final int SUBS_NONE = 2;
/**
* Constant indicating to select subclasses but without adding any
* class conditions to the select.
*/
public static final int SUBS_ANY_JOINABLE = 3;
/**
* Constant indicating to select this class but without adding any
* class conditions to the select.
*/
public static final int SUBS_EXACT = 4;
/**
* The alias to use for the from select, if any.
*/
public static final String FROM_SELECT_ALIAS = "s";
/**
* The index of this select within the UNION, or 0.
*/
public int indexOf();
/**
* Return this select's subselects, or empty collection if none.
*/
public List getSubselects();
/**
* Return the parent of this select, if it is a subselect.
*/
public Select getParent();
/**
* Return the subselect path for this select, if it is a subselect.
*/
public String getSubselectPath();
/**
* Turn this select into a subselect of the given instance.
*/
public void setParent(Select parent, String path);
/**
* Another select instance that creates a temporary table from which
* this select pulls data.
*/
public Select getFromSelect();
/**
* Another select instance that creates a temporary table from which
* this select pulls data.
*/
public void setFromSelect(Select sel);
/**
* Whether this select has an eager join of the specified type.
*/
public boolean hasEagerJoin(boolean toMany);
/**
* Whether this select has a join of the specified type.
*/
public boolean hasJoin(boolean toMany);
/**
* Return whether the given table is being used in this select.
*/
public boolean isSelected(Table table);
/**
* Return the set of all used table aliases.
*/
public Collection getTableAliases();
/**
* Return the actual {@link Val}s and {@link Column}s that were
* selected, in the order that they were selected.
*
* @since 1.1.0
*/
public List getSelects();
/**
* Return the aliases of all selected columns and all selected buffers,
* in the order they were selected. Each alias may be either a string
* or a {@link SQLBuffer}.
*/
public List getSelectAliases();
/**
* Get the aliases for identifier columns that can be used in COUNT
* selects to find the number of matches. Each alias will be a
* string. If no identifier columns have been nominated, then all
* column alises are returned.
*/
public List getIdentifierAliases();
/**
* Return the ordering SQL for this select.
*/
public SQLBuffer getOrdering();
/**
* Return the grouping SQL for this select.
*/
public SQLBuffer getGrouping();
/**
* Return the WHERE clause, minus any necessary end joins.
*/
public SQLBuffer getWhere();
/**
* Return the HAVING clause, or null if none.
*/
public SQLBuffer getHaving();
/**
* Apply class conditions from relation joins. This may affect the return
* values of {@link #getJoins}, {@link #getJoinIterator}, and
* {@link #getWhere}.
*/
public void addJoinClassConditions();
/**
* Return the top-level joins for this select.
*/
public Joins getJoins();
/**
* Return the top-level {@link Join} elements for this select.
*/
public Iterator getJoinIterator();
/**
* The result start index.
*/
public long getStartIndex();
/**
* The result end index.
*/
public long getEndIndex();
/**
* Set the result range for this select.
*/
public void setRange(long start, long end);
/**
* Return the alias for the given column.
*/
public String getColumnAlias(Column col);
/**
* Return the alias for the given column.
*/
public String getColumnAlias(Column col, Joins joins);
/**
* Return the alias for the given column.
*/
public String getColumnAlias(String col, Table table);
/**
* Return the alias for the given column.
*/
public String getColumnAlias(String col, Table table, Joins joins);
/**
* Return true if this is an aggregate select.
*/
public boolean isAggregate();
/**
* Set to true for aggregate selects.
*/
public void setAggregate(boolean agg);
/**
* Return true if this select includes a LOB.
*/
public boolean isLob();
/**
* Set to true for selects that include LOB columns.
*/
public void setLob(boolean lob);
/**
* Clear the existing column selects.
*/
public void clearSelects();
/**
* Select the given SQL as a placeholder for a UNION element.
*/
public void selectPlaceholder(String sql);
/**
* Select the given SQL; the given id object is an identifier
* to use when retrieving the corresponding value from a {@link Result}.
*
* @return true if selected
*/
public boolean select(SQLBuffer sql, Object id);
/**
* Select the given SQL; the given id object is an identifier
* to use when retrieving the corresponding value from a {@link Result}.
*
* @return true if selected
*/
public boolean select(SQLBuffer sql, Object id, Joins joins);
/**
* Select the given SQL; the given id object is an identifier
* to use when retrieving the corresponding value from a {@link Result}.
*
* @return true if selected
*/
public boolean select(String sql, Object id);
/**
* Select the given SQL; the given id object is an identifier
* to use when retrieving the corresponding value from a {@link Result}.
*
* @return true if selected
*/
public boolean select(String sql, Object id, Joins joins);
/**
* Select the given column.
*
* @return true if selected
*/
public boolean select(Column col);
/**
* Select the given column.
*
* @return true if selected
*/
public boolean select(Column col, Joins joins);
/**
* Select the given columns.
*
* @return bit set of indexes of columns that were selected
*/
public int select(Column[] cols);
/**
* Select the given columns.
*
* @return bit set of indexes of columns that were selected
*/
public int select(Column[] cols, Joins joins);
/**
* Select the columns of the given mapping, possibly including subclasses.
* This method should be called after all where conditions are added in
* case the given mapping batches other selects.
*/
public void select(ClassMapping mapping, int subclasses,
JDBCStore store, JDBCFetchConfiguration fetch, int eager);
/**
* Select the columns of the given mapping, possibly including subclasses.
* This method should be called after all where conditions are added in
* case the given mapping batches other selects.
*/
public void select(ClassMapping mapping, int subclasses,
JDBCStore store, JDBCFetchConfiguration fetch, int eager,
Joins joins);
/**
* Select the given column as one that can be used to get a count of
* distinct matches. It is not necessary to designate distinct identifiers
* when eagerly traversing the entire result of the select or when
* not using an LRSSize setting of count.
*
* @return true if selected
*/
public boolean selectIdentifier(Column col);
/**
* Select the given column as one that can be used to get a count of
* distinct matches. It is not necessary to designate distinct identifiers
* when eagerly traversing the entire result of the select or when
* not using an LRSSize setting of count.
*
* @return true if selected
*/
public boolean selectIdentifier(Column col, Joins joins);
/**
* Select the given columns as ones that can be used to get a count of
* distinct matches. It is not necessary to designate distinct identifiers
* when eagerly traversing the entire result of the select or when
* not using an LRSSize setting of count.
*
* @return bit set of indexes of columns that were selected
*/
public int selectIdentifier(Column[] cols);
/**
* Select the given columns as ones that can be used to get a count of
* distinct matches. It is not necessary to designate distinct identifiers
* when eagerly traversing the entire result of the select or when
* not using an LRSSize setting of count.
*
* @return bit set of indexes of columns that were selected
*/
public int selectIdentifier(Column[] cols, Joins joins);
/**
* Select the columns of the given mapping, possibly including subclasses.
* This method should be called after all where conditions are added in
* case the given mapping batches other selects.
* The primary key columns of the mapping can be used to get a count of
* distinct matches. It is not necessary to designate distinct identifiers
* when eagerly traversing the entire result of the select or when
* not using an LRSSize setting of count.
*/
public void selectIdentifier(ClassMapping mapping, int subclasses,
JDBCStore store, JDBCFetchConfiguration fetch, int eager);
/**
* Select the columns of the given mapping, possibly including subclasses.
* This method should be called after all where conditions are added in
* case the given mapping batches other selects.
* The primary key columns of the mapping can be used to get a count of
* distinct matches. It is not necessary to designate distinct identifiers
* when eagerly traversing the entire result of the select or when
* not using an LRSSize setting of count.
*/
public void selectIdentifier(ClassMapping mapping, int subclasses,
JDBCStore store, JDBCFetchConfiguration fetch, int eager,
Joins joins);
/**
* Select the primary key columns of the given mapping, joining to
* superclasses as necessary to get all columns needed to construct
* an object id.
*
* @return bit set of indexes of pk columns that were selected
*/
public int selectPrimaryKey(ClassMapping mapping);
/**
* Select the primary key columns of the given mapping, joining to
* superclasses as necessary to get all columns needed to construct
* an object id.
*
* @return bit set of indexes of pk columns that were selected
*/
public int selectPrimaryKey(ClassMapping mapping, Joins joins);
/**
* Clear odering conditions.
*/
public void clearOrdering();
/**
* Order on the primary key columns of the given mapping,
* joining to superclasses as necessary to get all columns needed to
* construct an object id.
* Optionally selects ordering data if not already selected.
*/
public int orderByPrimaryKey(ClassMapping mapping, boolean asc,
boolean sel);
/**
* Select and order on the primary key columns of the given mapping,
* joining to superclasses as necessary to get all columns needed to
* construct an object id.
* Optionally selects ordering data if not already selected.
*/
public int orderByPrimaryKey(ClassMapping mapping, boolean asc,
Joins joins, boolean sel);
/**
* Order by the given column.
* Optionally selects ordering data if not already selected.
*/
public boolean orderBy(Column col, boolean asc, boolean sel);
/**
* Order by the given column.
* Optionally selects ordering data if not already selected.
*/
public boolean orderBy(Column col, boolean asc, Joins joins,
boolean sel);
/**
* Order by the given columns.
* Optionally selects ordering data if not already selected.
*/
public int orderBy(Column[] cols, boolean asc, boolean sel);
/**
* Order by the given columns.
* Optionally selects ordering data if not already selected.
*/
public int orderBy(Column[] cols, boolean asc, Joins joins, boolean sel);
/**
* Add an ORDER BY clause.
* Optionally selects ordering data if not already selected.
*/
public boolean orderBy(SQLBuffer sql, boolean asc, boolean sel,
Value selAs);
/**
* Add an ORDER BY clause.
* Optionally selects ordering data if not already selected.
*/
public boolean orderBy(SQLBuffer sql, boolean asc, Joins joins,
boolean sel, Value selAs);
/**
* Add an ORDER BY clause.
* Optionally selects ordering data if not already selected.
*/
public boolean orderBy(String sql, boolean asc, boolean sel);
/**
* Add an ORDER BY clause.
* Optionally selects ordering data if not already selected.
*/
public boolean orderBy(String sql, boolean asc, Joins joins, boolean sel);
/**
* Add where conditions setting the mapping's primary key to the given
* oid values. If the given mapping does not use oid values for its
* primary key, we will recursively join to its superclass until we find
* an ancestor that does.
*/
public void wherePrimaryKey(Object oid, ClassMapping mapping,
JDBCStore store);
/**
* Add where conditions setting the given foreign key to the given
* oid values.
*
* @see #wherePrimaryKey
*/
public void whereForeignKey(ForeignKey fk, Object oid,
ClassMapping mapping, JDBCStore store);
/**
* Add the given where conditions.
*/
public void where(Joins joins);
/**
* Add the given where conditions.
*/
public void where(SQLBuffer sql);
/**
* Add the given where conditions.
*/
public void where(SQLBuffer sql, Joins joins);
/**
* Add the given where conditions.
*/
public void where(String sql);
/**
* Add the given where conditions.
*/
public void where(String sql, Joins joins);
/**
* Add the given having conditions.
*/
public void having(SQLBuffer sql);
/**
* Add the given having conditions.
*/
public void having(SQLBuffer sql, Joins joins);
/**
* Add the given having conditions.
*/
public void having(String sql);
/**
* Add the given having conditions.
*/
public void having(String sql, Joins joins);
/**
* Group by the given column.
*/
public void groupBy(Column col);
/**
* Group by the given column.
*/
public void groupBy(Column col, Joins joins);
/**
* Group by the given columns.
*/
public void groupBy(Column[] cols);
/**
* Group by the given columns.
*/
public void groupBy(Column[] cols, Joins joins);
/**
* Add a GROUP BY clause.
*/
public void groupBy(SQLBuffer sql);
/**
* Add a GROUP BY clause.
*/
public void groupBy(SQLBuffer sql, Joins joins);
/**
* Add a GROUP BY clause.
*/
public void groupBy(String sql);
/**
* Add a GROUP BY clause.
*/
public void groupBy(String sql, Joins joins);
/**
* Group by the columns of the given mapping, possibly including subclasses.
* Assumes EAGER_NONE.
*/
public void groupBy(ClassMapping mapping, int subclasses, JDBCStore store,
JDBCFetchConfiguration fetch);
/**
* Group by the columns of the given mapping, possibly including subclasses.
* Assumes EAGER_NONE.
*/
public void groupBy(ClassMapping mapping, int subclasses, JDBCStore store,
JDBCFetchConfiguration fetch, Joins joins);
/**
* Return a SELECT with the same joins and where conditions as this one.
*
* @param sels number of selects to UNION together; ignored if <= 1
*/
public SelectExecutor whereClone(int sels);
/**
* Return a SELECT that is a complete clone of this one.
*
* @param sels number of selects to UNION together; ignored if <= 1
*/
public SelectExecutor fullClone(int sels);
/**
* Return a select that will be eagerly executed with this one, or null if
* the select cannot be created for the given key and join type.
* If the join type is inner or outer, then this select instance will be
* returned. Otherwise, the returned select will have a clone of this
* select's where conditions and joins but will be independent.
*
* @param key the key for the eager select
* @param eagerType one of the EAGER_* constants
* @param toMany whether the eager join is to-many
* @param sels number of selects to UNION together; ignored if <= 1
*/
public SelectExecutor eagerClone(FieldMapping key, int eagerType,
boolean toMany, int sels);
/**
* Return the eager select for the given key.
*/
public SelectExecutor getEager(FieldMapping key);
/**
* Return a new instance to use for joining.
*/
public Joins newJoins();
/**
* Return a new instance to use for outer joining.
*/
public Joins newOuterJoins();
/**
* Append the given joins to the given buffer.
*/
public void append(SQLBuffer buf, Joins joins);
/**
* AND the given joins together. The given joins will be hollowed in the
* process.
*/
public Joins and(Joins joins1, Joins joins2);
/**
* OR the given joins together. The common joins will be removed in the
* process.
*/
public Joins or(Joins joins1, Joins joins2);
/**
* Return a join set making the given joins outer joins.
*/
public Joins outer(Joins joins);
/**
* Implement toString to generate SQL string for profiling/debuggging.
*/
public String toString();
/**
* Return the alias for the given column, without creating new table alias
*/
public String getColumnAlias(Column col, Object path);
/**
* Set JPQL query context for this select
* @param context
*/
public void setContext(Context context);
/**
* Return the JPQL query context of this select
*/
public Context ctx();
/**
* Record the initial schemaAlias of a join path
* @param schemaAlias
*/
public void setSchemaAlias(String schemaAlias);
/**
* Set the flag to indicate whether this Select has
* internally generated subselect
*/
public void setHasSubselect(boolean hasSub);
/**
* Return the flag to indicate whether this Select has
* internally generated subselect
* @return
*/
public boolean getHasSubselect();
/**
* Extended trace that logs eager relations
*/
public void logEagerRelations();
}
