001 /*
002 * Copyright 2003-2004 Sun Microsystems, Inc. All Rights Reserved.
003 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
004 *
005 * This code is free software; you can redistribute it and/or modify it
006 * under the terms of the GNU General Public License version 2 only, as
007 * published by the Free Software Foundation. Sun designates this
008 * particular file as subject to the "Classpath" exception as provided
009 * by Sun in the LICENSE file that accompanied this code.
010 *
011 * This code is distributed in the hope that it will be useful, but WITHOUT
012 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
013 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
014 * version 2 for more details (a copy is included in the LICENSE file that
015 * accompanied this code).
016 *
017 * You should have received a copy of the GNU General Public License version
018 * 2 along with this work; if not, write to the Free Software Foundation,
019 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
020 *
021 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
022 * CA 95054 USA or visit www.sun.com if you need additional information or
023 * have any questions.
024 */
025
026 package javax.sql.rowset;
027
028 import java.sql.*;
029 import javax.sql.*;
030 import javax.naming.*;
031 import java.io.*;
032 import java.math.*;
033 import java.util.*;
034
035 import javax.sql.rowset.*;
036
037 /**
038 * The <code>JoinRowSet</code> interface provides a mechanism for combining related
039 * data from different <code>RowSet</code> objects into one <code>JoinRowSet</code>
040 * object, which represents an SQL <code>JOIN</code>.
041 * In other words, a <code>JoinRowSet</code> object acts as a
042 * container for the data from <code>RowSet</code> objects that form an SQL
043 * <code>JOIN</code> relationship.
044 * <P>
045 * The <code>Joinable</code> interface provides the methods for setting,
046 * retrieving, and unsetting a match column, the basis for
047 * establishing an SQL <code>JOIN</code> relationship. The match column may
048 * alternatively be set by supplying it to the appropriate version of the
049 * <code>JointRowSet</code> method <code>addRowSet</code>.
050 * <P>
051 * <p>
052 * <h3>1.0 Overview</h3>
053 * Disconnected <code>RowSet</code> objects (<code>CachedRowSet</code> objects
054 * and implementations extending the <code>CachedRowSet</code> interface)
055 * do not have a standard way to establish an SQL <code>JOIN</code> between
056 * <code>RowSet</code> objects without the expensive operation of
057 * reconnecting to the data source. The <code>JoinRowSet</code>
058 * interface is specifically designed to address this need.
059 * <P>
060 * Any <code>RowSet</code> object
061 * can be added to a <code>JoinRowSet</code> object to become
062 * part of an SQL <code>JOIN</code> relationship. This means that both connected
063 * and disconnected <code>RowSet</code> objects can be part of a <code>JOIN</code>.
064 * <code>RowSet</code> objects operating in a connected environment
065 * (<code>JdbcRowSet</code> objects) are
066 * encouraged to use the database to which they are already
067 * connected to establish SQL <code>JOIN</code> relationships between
068 * tables directly. However, it is possible for a
069 * <code>JdbcRowSet</code> object to be added to a <code>JoinRowSet</code> object
070 * if necessary.
071 * <P>
072 * Any number of <code>RowSet</code> objects can be added to an
073 * instance of <code>JoinRowSet</code> provided that they
074 * can be related in an SQL <code>JOIN</code>.
075 * By definition, the SQL <code>JOIN</code> statement is used to
076 * combine the data contained in two or more relational database tables based
077 * upon a common attribute. The <code>Joinable</code> interface provides the methods
078 * for establishing a common attribute, which is done by setting a
079 * <i>match column</i>. The match column commonly coincides with
080 * the primary key, but there is
081 * no requirement that the match column be the same as the primary key.
082 * By establishing and then enforcing column matches,
083 * a <code>JoinRowSet</code> object establishes <code>JOIN</code> relationships
084 * between <code>RowSet</code> objects without the assistance of an available
085 * relational database.
086 * <P>
087 * The type of <code>JOIN</code> to be established is determined by setting
088 * one of the <code>JoinRowSet</code> constants using the method
089 * <code>setJoinType</code>. The following SQL <code>JOIN</code> types can be set:
090 * <UL>
091 * <LI><code>CROSS_JOIN</code>
092 * <LI><code>FULL_JOIN</code>
093 * <LI><code>INNER_JOIN</code> - the default if no <code>JOIN</code> type has been set
094 * <LI><code>LEFT_OUTER_JOIN</code>
095 * <LI><code>RIGHT_OUTER_JOIN</code>
096 * </UL>
097 * Note that if no type is set, the <code>JOIN</code> will automatically be an
098 * inner join. The comments for the fields in the
099 * <code>JoinRowSet</code> interface explain these <code>JOIN</code> types, which are
100 * standard SQL <code>JOIN</code> types.
101 * <P>
102 * <h3>2.0 Using a <code>JoinRowSet</code> Object for Creating a <code>JOIN</code></h3>
103 * When a <code>JoinRowSet</code> object is created, it is empty.
104 * The first <code>RowSet</code> object to be added becomes the basis for the
105 * <code>JOIN</code> relationship.
106 * Applications must determine which column in each of the
107 * <code>RowSet</code> objects to be added to the <code>JoinRowSet</code> object
108 * should be the match column. All of the
109 * <code>RowSet</code> objects must contain a match column, and the values in
110 * each match column must be ones that can be compared to values in the other match
111 * columns. The columns do not have to have the same name, though they often do,
112 * and they do not have to store the exact same data type as long as the data types
113 * can be compared.
114 * <P>
115 * A match column can be be set in two ways:
116 * <ul>
117 * <li>By calling the <code>Joinable</code> method <code>setMatchColumn</code><br>
118 * This is the only method that can set the match column before a <code>RowSet</code>
119 * object is added to a <code>JoinRowSet</code> object. The <code>RowSet</code> object
120 * must have implemented the <code>Joinable</code> interface in order to use the method
121 * <code>setMatchColumn</code>. Once the match column value
122 * has been set, this method can be used to reset the match column at any time.
123 * <li>By calling one of the versions of the <code>JoinRowSet</code> method
124 * <code>addRowSet</code> that takes a column name or number (or an array of
125 * column names or numbers)<BR>
126 * Four of the five <code>addRowSet</code> methods take a match column as a parameter.
127 * These four methods set or reset the match column at the time a <code>RowSet</code>
128 * object is being added to a <code>JoinRowSet</code> object.
129 * </ul>
130 * <h3>3.0 Sample Usage</h3>
131 * <p>
132 * The following code fragment adds two <code>CachedRowSet</code>
133 * objects to a <code>JoinRowSet</code> object. Note that in this example,
134 * no SQL <code>JOIN</code> type is set, so the default <code>JOIN</code> type,
135 * which is <i>INNER_JOIN</i>, is established.
136 * <p>
137 * In the following code fragment, the table <code>EMPLOYEES</code>, whose match
138 * column is set to the first column (<code>EMP_ID</code>), is added to the
139 * <code>JoinRowSet</code> object <i>jrs</i>. Then
140 * the table <code>ESSP_BONUS_PLAN</code>, whose match column is likewise
141 * the <code>EMP_ID</code> column, is added. When this second
142 * table is added to <i>jrs</i>, only the rows in
143 * <code>ESSP_BONUS_PLAN</code> whose <code>EMP_ID</code> value matches an
144 * <code>EMP_ID</code> value in the <code>EMPLOYEES</code> table are added.
145 * In this case, everyone in the bonus plan is an employee, so all of the rows
146 * in the table <code>ESSP_BONUS_PLAN</code> are added to the <code>JoinRowSet</code>
147 * object. In this example, both <code>CachedRowSet</code> objects being added
148 * have implemented the <code>Joinable</code> interface and can therefore call
149 * the <code>Joinable</code> method <code>setMatchColumn</code>.
150 * <PRE>
151 * JoinRowSet jrs = new JoinRowSetImpl();
152 *
153 * ResultSet rs1 = stmt.executeQuery("SELECT * FROM EMPLOYEES");
154 * CachedRowSet empl = new CachedRowSetImpl();
155 * empl.populate(rs1);
156 * empl.setMatchColumn(1);
157 * jrs.addRowSet(empl);
158 *
159 * ResultSet rs2 = stmt.executeQuery("SELECT * FROM ESSP_BONUS_PLAN");
160 * CachedRowSet bonus = new CachedRowSetImpl();
161 * bonus.populate(rs2);
162 * bonus.setMatchColumn(1); // EMP_ID is the first column
163 * jrs.addRowSet(bonus);
164 * </PRE>
165 * <P>
166 * At this point, <i>jrs</i> is an inside JOIN of the two <code>RowSet</code> objects
167 * based on their <code>EMP_ID</code> columns. The application can now browse the
168 * combined data as if it were browsing one single <code>RowSet</code> object.
169 * Because <i>jrs</i> is itself a <code>RowSet</code> object, an application can
170 * navigate or modify it using <code>RowSet</code> methods.
171 * <PRE>
172 * jrs.first();
173 * int employeeID = jrs.getInt(1);
174 * String employeeName = jrs.getString(2);
175 * </PRE>
176 * <P>
177 * Note that because the SQL <code>JOIN</code> must be enforced when an application
178 * adds a second or subsequent <code>RowSet</code> object, there
179 * may be an initial degradation in performance while the <code>JOIN</code> is
180 * being performed.
181 * <P>
182 * The following code fragment adds an additional <code>CachedRowSet</code> object.
183 * In this case, the match column (<code>EMP_ID</code>) is set when the
184 * <code>CachedRowSet</code> object is added to the <code>JoinRowSet</code> object.
185 * <PRE>
186 * ResultSet rs3 = stmt.executeQuery("SELECT * FROM 401K_CONTRIB");
187 * CachedRowSet fourO1k = new CachedRowSetImpl();
188 * four01k.populate(rs3);
189 * jrs.addRowSet(four01k, 1);
190 * </PRE>
191 * <P>
192 * The <code>JoinRowSet</code> object <i>jrs</i> now contains values from all three
193 * tables. The data in each row in <i>four01k</i> in which the value for the
194 * <code>EMP_ID</code> column matches a value for the <code>EMP_ID</code> column
195 * in <i>jrs</i> has been added to <i>jrs</i>.
196 * <P>
197 * <h3>4.0 <code>JoinRowSet</code> Methods</h3>
198 * The <code>JoinRowSet</code> interface supplies several methods for adding
199 * <code>RowSet</code> objects and for getting information about the
200 * <code>JoinRowSet</code> object.
201 * <UL>
202 * <LI>Methods for adding one or more <code>RowSet</code> objects<BR>
203 * These methods allow an application to add one <code>RowSet</code> object
204 * at a time or to add multiple <code>RowSet</code> objects at one time. In
205 * either case, the methods may specify the match column for each
206 * <code>RowSet</code> object being added.
207 * <LI>Methods for getting information<BR>
208 * One method retrieves the <code>RowSet</code> objects in the
209 * <code>JoinRowSet</code> object, and another method retrieves the
210 * <code>RowSet</code> names. A third method retrieves either the SQL
211 * <code>WHERE</code> clause used behind the scenes to form the
212 * <code>JOIN</code> or a text description of what the <code>WHERE</code>
213 * clause does.
214 * <LI>Methods related to the type of <code>JOIN</code><BR>
215 * One method sets the <code>JOIN</code> type, and five methods find out whether
216 * the <code>JoinRowSet</code> object supports a given type.
217 * <LI>A method to make a separate copy of the <code>JoinRowSet</code> object<BR>
218 * This method creates a copy that can be persisted to the data source.
219 * </UL>
220 * <P>
221 */
222
223 public interface JoinRowSet extends WebRowSet {
224
225 /**
226 * Adds the given <code>RowSet</code> object to this <code>JoinRowSet</code>
227 * object. If the <code>RowSet</code> object
228 * is the first to be added to this <code>JoinRowSet</code>
229 * object, it forms the basis of the <code>JOIN</code> relationship to be
230 * established.
231 * <P>
232 * This method should be used only when the given <code>RowSet</code>
233 * object already has a match column that was set with the <code>Joinable</code>
234 * method <code>setMatchColumn</code>.
235 * <p>
236 * Note: A <code>Joinable</code> object is any <code>RowSet</code> object
237 * that has implemented the <code>Joinable</code> interface.
238 *
239 * @param rowset the <code>RowSet</code> object that is to be added to this
240 * <code>JoinRowSet</code> object; it must implement the
241 * <code>Joinable</code> interface and have a match column set
242 * @throws SQLException if (1) an empty rowset is added to the to this
243 * <code>JoinRowSet</code> object, (2) a match column has not been
244 * set for <i>rowset</i>, or (3) <i>rowset</i>
245 * violates the active <code>JOIN</code>
246 * @see Joinable#setMatchColumn
247 */
248 public void addRowSet(Joinable rowset) throws SQLException;
249
250 /**
251 * Adds the given <code>RowSet</code> object to this <code>JoinRowSet</code>
252 * object and sets the designated column as the match column for
253 * the <code>RowSet</code> object. If the <code>RowSet</code> object
254 * is the first to be added to this <code>JoinRowSet</code>
255 * object, it forms the basis of the <code>JOIN</code> relationship to be
256 * established.
257 * <P>
258 * This method should be used when <i>RowSet</i> does not already have a match
259 * column set.
260 *
261 * @param rowset the <code>RowSet</code> object that is to be added to this
262 * <code>JoinRowSet</code> object; it may implement the
263 * <code>Joinable</code> interface
264 * @param columnIdx an <code>int</code> that identifies the column to become the
265 * match column
266 * @throws SQLException if (1) <i>rowset</i> is an empty rowset or
267 * (2) <i>rowset</i> violates the active <code>JOIN</code>
268 * @see Joinable#unsetMatchColumn
269 */
270 public void addRowSet(RowSet rowset, int columnIdx)
271 throws SQLException;
272
273 /**
274 * Adds <i>rowset</i> to this <code>JoinRowSet</code> object and
275 * sets the designated column as the match column. If <i>rowset</i>
276 * is the first to be added to this <code>JoinRowSet</code>
277 * object, it forms the basis for the <code>JOIN</code> relationship to be
278 * established.
279 * <P>
280 * This method should be used when the given <code>RowSet</code> object
281 * does not already have a match column.
282 *
283 * @param rowset the <code>RowSet</code> object that is to be added to this
284 * <code>JoinRowSet</code> object; it may implement the
285 * <code>Joinable</code> interface
286 * @param columnName the <code>String</code> object giving the name of the
287 * column to be set as the match column
288 * @throws SQLException if (1) <i>rowset</i> is an empty rowset or
289 * (2) the match column for <i>rowset</i> does not satisfy the
290 * conditions of the <code>JOIN</code>
291 */
292 public void addRowSet(RowSet rowset, String columnName)
293 throws SQLException;
294
295 /**
296 * Adds one or more <code>RowSet</code> objects contained in the given
297 * array of <code>RowSet</code> objects to this <code>JoinRowSet</code>
298 * object and sets the match column for
299 * each of the <code>RowSet</code> objects to the match columns
300 * in the given array of column indexes. The first element in
301 * <i>columnIdx</i> is set as the match column for the first
302 * <code>RowSet</code> object in <i>rowset</i>, the second element of
303 * <i>columnIdx</i> is set as the match column for the second element
304 * in <i>rowset</i>, and so on.
305 * <P>
306 * The first <code>RowSet</code> object added to this <code>JoinRowSet</code>
307 * object forms the basis for the <code>JOIN</code> relationship.
308 * <P>
309 * This method should be used when the given <code>RowSet</code> object
310 * does not already have a match column.
311 *
312 * @param rowset an array of one or more <code>RowSet</code> objects
313 * to be added to the <code>JOIN</code>; it may implement the
314 * <code>Joinable</code> interface
315 * @param columnIdx an array of <code>int</code> values indicating the index(es)
316 * of the columns to be set as the match columns for the <code>RowSet</code>
317 * objects in <i>rowset</i>
318 * @throws SQLException if (1) an empty rowset is added to this
319 * <code>JoinRowSet</code> object, (2) a match column is not set
320 * for a <code>RowSet</code> object in <i>rowset</i>, or (3)
321 * a <code>RowSet</code> object being added violates the active
322 * <code>JOIN</code>
323 */
324 public void addRowSet(RowSet[] rowset, int[] columnIdx)
325 throws SQLException;
326
327 /**
328 * Adds one or more <code>RowSet</code> objects contained in the given
329 * array of <code>RowSet</code> objects to this <code>JoinRowSet</code>
330 * object and sets the match column for
331 * each of the <code>RowSet</code> objects to the match columns
332 * in the given array of column names. The first element in
333 * <i>columnName</i> is set as the match column for the first
334 * <code>RowSet</code> object in <i>rowset</i>, the second element of
335 * <i>columnName</i> is set as the match column for the second element
336 * in <i>rowset</i>, and so on.
337 * <P>
338 * The first <code>RowSet</code> object added to this <code>JoinRowSet</code>
339 * object forms the basis for the <code>JOIN</code> relationship.
340 * <P>
341 * This method should be used when the given <code>RowSet</code> object(s)
342 * does not already have a match column.
343 *
344 * @param rowset an array of one or more <code>RowSet</code> objects
345 * to be added to the <code>JOIN</code>; it may implement the
346 * <code>Joinable</code> interface
347 * @param columnName an array of <code>String</code> values indicating the
348 * names of the columns to be set as the match columns for the
349 * <code>RowSet</code> objects in <i>rowset</i>
350 * @throws SQLException if (1) an empty rowset is added to this
351 * <code>JoinRowSet</code> object, (2) a match column is not set
352 * for a <code>RowSet</code> object in <i>rowset</i>, or (3)
353 * a <code>RowSet</code> object being added violates the active
354 * <code>JOIN</code>
355 */
356 public void addRowSet(RowSet[] rowset, String[] columnName)
357 throws SQLException;
358
359 /**
360 * Returns a <code>Collection</code> object containing the
361 * <code>RowSet</code> objects that have been added to this
362 * <code>JoinRowSet</code> object.
363 * This should return the 'n' number of RowSet contained
364 * within the <code>JOIN</code> and maintain any updates that have occured while in
365 * this union.
366 *
367 * @return a <code>Collection</code> object consisting of the
368 * <code>RowSet</code> objects added to this <code>JoinRowSet</code>
369 * object
370 * @throws SQLException if an error occurs generating the
371 * <code>Collection</code> object to be returned
372 */
373 public Collection<?> getRowSets() throws java.sql.SQLException;
374
375 /**
376 * Returns a <code>String</code> array containing the names of the
377 * <code>RowSet</code> objects added to this <code>JoinRowSet</code>
378 * object.
379 *
380 * @return a <code>String</code> array of the names of the
381 * <code>RowSet</code> objects in this <code>JoinRowSet</code>
382 * object
383 * @throws SQLException if an error occurs retrieving the names of
384 * the <code>RowSet</code> objects
385 * @see CachedRowSet#setTableName
386 */
387 public String[] getRowSetNames() throws java.sql.SQLException;
388
389 /**
390 * Creates a new <code>CachedRowSet</code> object containing the
391 * data in this <code>JoinRowSet</code> object, which can be saved
392 * to a data source using the <code>SyncProvider</code> object for
393 * the <code>CachedRowSet</code> object.
394 * <P>
395 * If any updates or modifications have been applied to the JoinRowSet
396 * the CachedRowSet returned by the method will not be able to persist
397 * it's changes back to the originating rows and tables in the
398 * in the datasource. The CachedRowSet instance returned should not
399 * contain modification data and it should clear all properties of
400 * it's originating SQL statement. An application should reset the
401 * SQL statement using the <code>RowSet.setCommand</code> method.
402 * <p>
403 * In order to allow changes to be persisted back to the datasource
404 * to the originating tables, the <code>acceptChanges</code> method
405 * should be used and called on a JoinRowSet object instance. Implementations
406 * can leverage the internal data and update tracking in their
407 * implementations to interact with the SyncProvider to persist any
408 * changes.
409 *
410 * @return a CachedRowSet containing the contents of the JoinRowSet
411 * @throws SQLException if an error occurs assembling the CachedRowSet
412 * object
413 * @see javax.sql.RowSet
414 * @see javax.sql.rowset.CachedRowSet
415 * @see javax.sql.rowset.spi.SyncProvider
416 */
417 public CachedRowSet toCachedRowSet() throws java.sql.SQLException;
418
419 /**
420 * Indicates if CROSS_JOIN is supported by a JoinRowSet
421 * implementation
422 *
423 * @return true if the CROSS_JOIN is supported; false otherwise
424 */
425 public boolean supportsCrossJoin();
426
427 /**
428 * Indicates if INNER_JOIN is supported by a JoinRowSet
429 * implementation
430 *
431 * @return true is the INNER_JOIN is supported; false otherwise
432 */
433 public boolean supportsInnerJoin();
434
435 /**
436 * Indicates if LEFT_OUTER_JOIN is supported by a JoinRowSet
437 * implementation
438 *
439 * @return true is the LEFT_OUTER_JOIN is supported; false otherwise
440 */
441 public boolean supportsLeftOuterJoin();
442
443 /**
444 * Indicates if RIGHT_OUTER_JOIN is supported by a JoinRowSet
445 * implementation
446 *
447 * @return true is the RIGHT_OUTER_JOIN is supported; false otherwise
448 */
449 public boolean supportsRightOuterJoin();
450
451 /**
452 * Indicates if FULL_JOIN is supported by a JoinRowSet
453 * implementation
454 *
455 * @return true is the FULL_JOIN is supported; false otherwise
456 */
457 public boolean supportsFullJoin();
458
459 /**
460 * Allow the application to adjust the type of <code>JOIN</code> imposed
461 * on tables contained within the JoinRowSet object instance.
462 * Implementations should throw a SQLException if they do
463 * not support a given <code>JOIN</code> type.
464 *
465 * @param joinType the standard JoinRowSet.XXX static field definition
466 * of a SQL <code>JOIN</code> to re-configure a JoinRowSet instance on
467 * the fly.
468 * @throws SQLException if an unsupported <code>JOIN</code> type is set
469 * @see #getJoinType
470 */
471 public void setJoinType(int joinType) throws SQLException;
472
473 /**
474 * Return a SQL-like description of the WHERE clause being used
475 * in a JoinRowSet object. An implementation can describe
476 * the WHERE clause of the SQL <code>JOIN</code> by supplying a SQL
477 * strings description of <code>JOIN</code> or provide a textual
478 * description to assist applications using a <code>JoinRowSet</code>
479 *
480 * @return whereClause a textual or SQL description of the logical
481 * WHERE clause used in the JoinRowSet instance
482 * @throws SQLException if an error occurs in generating a representation
483 * of the WHERE clause.
484 */
485 public String getWhereClause() throws SQLException;
486
487 /**
488 * Returns a <code>int</code> describing the set SQL <code>JOIN</code> type
489 * governing this JoinRowSet instance. The returned type will be one of
490 * standard JoinRowSet types: <code>CROSS_JOIN</code>, <code>INNER_JOIN</code>,
491 * <code>LEFT_OUTER_JOIN</code>, <code>RIGHT_OUTER_JOIN</code> or
492 * <code>FULL_JOIN</code>.
493 *
494 * @return joinType one of the standard JoinRowSet static field
495 * definitions of a SQL <code>JOIN</code>. <code>JoinRowSet.INNER_JOIN</code>
496 * is returned as the default <code>JOIN</code> type is no type has been
497 * explicitly set.
498 * @throws SQLException if an error occurs determining the SQL <code>JOIN</code>
499 * type supported by the JoinRowSet instance.
500 * @see #setJoinType
501 */
502 public int getJoinType() throws SQLException;
503
504 /**
505 * An ANSI-style <code>JOIN</code> providing a cross product of two tables
506 */
507 public static int CROSS_JOIN = 0;
508
509 /**
510 * An ANSI-style <code>JOIN</code> providing a inner join between two tables. Any
511 * unmatched rows in either table of the join should be discarded.
512 */
513 public static int INNER_JOIN = 1;
514
515 /**
516 * An ANSI-style <code>JOIN</code> providing a left outer join between two
517 * tables. In SQL, this is described where all records should be
518 * returned from the left side of the JOIN statement.
519 */
520 public static int LEFT_OUTER_JOIN = 2;
521
522 /**
523 * An ANSI-style <code>JOIN</code> providing a right outer join between
524 * two tables. In SQL, this is described where all records from the
525 * table on the right side of the JOIN statement even if the table
526 * on the left has no matching record.
527 */
528 public static int RIGHT_OUTER_JOIN = 3;
529
530 /**
531 * An ANSI-style <code>JOIN</code> providing a a full JOIN. Specifies that all
532 * rows from either table be returned regardless of matching
533 * records on the other table.
534 */
535 public static int FULL_JOIN = 4;
536
537 }
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