libjava/classpath/java/sql/Statement.java

   1 /* Statement.java -- Interface for executing SQL statements.
   2    Copyright (C) 1999, 2000, 2002, 2006 Free Software Foundation, Inc.
   3
   4 This file is part of GNU Classpath.
   5
   6 GNU Classpath is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU Classpath is distributed in the hope that it will be useful, but
  12 WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14 General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU Classpath; see the file COPYING.  If not, write to the
  18 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  19 02110-1301 USA.
  20
  21 Linking this library statically or dynamically with other modules is
  22 making a combined work based on this library.  Thus, the terms and
  23 conditions of the GNU General Public License cover the whole
  24 combination.
  25
  26 As a special exception, the copyright holders of this library give you
  27 permission to link this library with independent modules to produce an
  28 executable, regardless of the license terms of these independent
  29 modules, and to copy and distribute the resulting executable under
  30 terms of your choice, provided that you also meet, for each linked
  31 independent module, the terms and conditions of the license of that
  32 module.  An independent module is a module which is not derived from
  33 or based on this library.  If you modify this library, you may extend
  34 this exception to your version of the library, but you are not
  35 obligated to do so.  If you do not wish to do so, delete this
  36 exception statement from your version. */
  37
  38
  39 package java.sql;
  40
  41 /**
  42  * This interface provides a mechanism for executing SQL statements.
  43  *
  44  * @author Aaron M. Renn (arenn@urbanophile.com)
  45  */
  46 public interface Statement
  47 {
  48   int CLOSE_CURRENT_RESULT = 1;
  49   int KEEP_CURRENT_RESULT = 2;
  50   int CLOSE_ALL_RESULTS = 3;
  51   int SUCCESS_NO_INFO = -2;
  52   int EXECUTE_FAILED = -3;
  53   int RETURN_GENERATED_KEYS = 1;
  54   int NO_GENERATED_KEYS = 2;
  55
  56   /**
  57    * This method executes the specified SQL SELECT statement and returns a
  58    * (possibly empty) <code>ResultSet</code> with the results of the query.
  59    *
  60    * @param sql The SQL statement to execute.
  61    * @return The result set of the SQL statement.
  62    * @exception SQLException If an error occurs.
  63    */
  64   ResultSet executeQuery(String sql) throws SQLException;
  65
  66   /**
  67    * This method executes the specified SQL INSERT, UPDATE, or DELETE statement
  68    * and returns the number of rows affected, which may be 0.
  69    *
  70    * @param sql The SQL statement to execute.
  71    * @return The number of rows affected by the SQL statement.
  72    * @exception SQLException If an error occurs.
  73    */
  74   int executeUpdate(String sql) throws SQLException;
  75
  76   /**
  77    * This method closes the statement and frees any associated resources.
  78    *
  79    * @exception SQLException If an error occurs.
  80    */
  81   void close() throws SQLException;
  82
  83   /**
  84    * This method returns the maximum length of any column value in bytes.
  85    *
  86    * @return The maximum length of any column value in bytes.
  87    * @exception SQLException If an error occurs.
  88    */
  89   int getMaxFieldSize() throws SQLException;
  90
  91   /**
  92    * This method sets the limit for the maximum length of any column in bytes.
  93    *
  94    * @param maxSize The new maximum length of any column in bytes.
  95    * @exception SQLException If an error occurs.
  96    */
  97   void setMaxFieldSize(int maxSize) throws SQLException;
  98
  99   /**
 100    * This method returns the maximum possible number of rows in a result set.
 101    *
 102    * @return The maximum possible number of rows in a result set.
 103    * @exception SQLException If an error occurs.
 104    */
 105   int getMaxRows() throws SQLException;
 106
 107   /**
 108    * This method sets the maximum number of rows that can be present in a
 109    * result set.
 110    *
 111    * @param maxRows The maximum possible number of rows in a result set.
 112    * @exception SQLException If an error occurs.
 113    */
 114   void setMaxRows(int maxRows) throws SQLException;
 115
 116   /**
 117    * This method sets the local escape processing mode on or off.  The
 118    * default value is on.
 119    *
 120    * @param escape <code>true</code> to enable local escape processing,
 121    *               <code>false</code> to disable it.
 122    * @exception SQLException If an error occurs.
 123    */
 124   void setEscapeProcessing(boolean escape) throws SQLException;
 125
 126   /**
 127    * The method returns the number of seconds a statement may be in process
 128    * before timing out.  A value of 0 means there is no timeout.
 129    *
 130    * @return The SQL statement timeout in seconds.
 131    * @exception SQLException If an error occurs.
 132    */
 133   int getQueryTimeout() throws SQLException;
 134
 135   /**
 136    * This method sets the number of seconds a statement may be in process
 137    * before timing out.  A value of 0 means there is no timeout.
 138    *
 139    * @param seconds The new SQL statement timeout value.
 140    * @exception SQLException If an error occurs.
 141    */
 142   void setQueryTimeout(int seconds) throws SQLException;
 143
 144   /**
 145    * This method cancels an outstanding statement, if the database supports
 146    * that operation.
 147    *
 148    * @exception SQLException If an error occurs.
 149    */
 150   void cancel() throws SQLException;
 151
 152   /**
 153    * This method returns the first SQL warning attached to this statement.
 154    * Subsequent warnings will be chained to this one.
 155    *
 156    * @return The first SQL warning for this statement.
 157    * @exception SQLException If an error occurs.
 158    */
 159   SQLWarning getWarnings() throws SQLException;
 160
 161   /**
 162    * This method clears any SQL warnings that have been attached to this
 163    * statement.
 164    *
 165    * @exception SQLException If an error occurs.
 166    */
 167   void clearWarnings() throws SQLException;
 168
 169   /**
 170    * This method sets the cursor name that will be used by the result set.
 171    *
 172    * @param name The cursor name to use for this statement.
 173    * @exception SQLException If an error occurs.
 174    */
 175   void setCursorName(String name) throws SQLException;
 176
 177   /**
 178    * This method executes an arbitrary SQL statement of any time.  The
 179    * methods <code>getResultSet</code>, <code>getMoreResults</code> and
 180    * <code>getUpdateCount</code> retrieve the results.
 181    *
 182    * @return <code>true</code> if a result set was returned, <code>false</code>
 183    *         if an update count was returned.
 184    * @exception SQLException If an error occurs.
 185    */
 186   boolean execute(String sql) throws SQLException;
 187
 188   /**
 189    * This method returns the result set of the SQL statement that was
 190    * executed.  This should be called only once per result set returned.
 191    *
 192    * @return The result set of the query, or <code>null</code> if there was
 193    *         no result set (for example, if the statement was an UPDATE).
 194    * @exception SQLException If an error occurs.
 195    * @see #execute(String)
 196    * @see #execute(String, int)
 197    * @see #execute(String, int[])
 198    * @see #execute(String, String[])
 199    */
 200   ResultSet getResultSet() throws SQLException;
 201
 202   /**
 203    * This method returns the update count of the SQL statement that was
 204    * executed.  This should be called only once per executed SQL statement.
 205    *
 206    * @return The update count of the query, or -1 if there was no update
 207    *         count (for example, if the statement was a SELECT).
 208    * @exception SQLException If an error occurs.
 209    * @see #execute(String)
 210    * @see #execute(String, int)
 211    * @see #execute(String, int[])
 212    * @see #execute(String, String[])
 213    */
 214   int getUpdateCount() throws SQLException;
 215
 216   /**
 217    * This method advances the result set pointer to the next result set,
 218    * which can then be retrieved using <code>getResultSet</code>
 219    *
 220    * @return <code>true</code> if there is another result set,
 221    *         <code>false</code> otherwise (for example, the next result is an
 222    *         update count).
 223    * @exception SQLException If an error occurs.
 224    * @see #execute(String)
 225    * @see #execute(String, int)
 226    * @see #execute(String, int[])
 227    * @see #execute(String, String[])
 228    */
 229   boolean getMoreResults() throws SQLException;
 230
 231   /**
 232    * This method informs the driver which direction the result set will
 233    * be accessed in.
 234    *
 235    * @param direction The direction the result set will be accessed in (?????)
 236    * @exception SQLException If an error occurs.
 237    */
 238   void setFetchDirection(int direction) throws SQLException;
 239
 240   /**
 241    * This method returns the current direction that the driver thinks the
 242    * result set will be accessed int.
 243    *
 244    * @return The direction the result set will be accessed in (????)
 245    * @exception SQLException If an error occurs.
 246    */
 247   int getFetchDirection() throws SQLException;
 248
 249   /**
 250    * This method informs the driver how many rows it should fetch from the
 251    * database at a time.
 252    *
 253    * @param numRows The number of rows the driver should fetch at a time
 254    *                to populate the result set.
 255    * @exception SQLException If an error occurs.
 256    */
 257   void setFetchSize(int numRows) throws SQLException;
 258
 259   /**
 260    * This method returns the number of rows the driver believes should be
 261    * fetched from the database at a time.
 262    *
 263    * @return The number of rows that will be fetched from the database at a time.
 264    * @exception SQLException If an error occurs.
 265    */
 266   int getFetchSize() throws SQLException;
 267
 268   /**
 269    * This method returns the concurrency type of the result set for this
 270    * statement. This will be one of the concurrency types defined in
 271    * <code>ResultSet</code>.
 272    *
 273    * @return The concurrency type of the result set for this statement.
 274    * @exception SQLException If an error occurs.
 275    * @see ResultSet
 276    */
 277   int getResultSetConcurrency() throws SQLException;
 278
 279   /**
 280    * This method returns the result set type for this statement.  This will
 281    * be one of the result set types defined in <code>ResultSet</code>.
 282    *
 283    * @return The result set type for this statement.
 284    * @exception SQLException If an error occurs.
 285    * @see ResultSet
 286    */
 287   int getResultSetType() throws SQLException;
 288
 289   /**
 290    * This method adds a SQL statement to a SQL batch.  A driver is not
 291    * required to implement this method.
 292    *
 293    * @param sql The sql statement to add to the batch.
 294    * @exception SQLException If an error occurs.
 295    */
 296   void addBatch(String sql) throws SQLException;
 297
 298   /**
 299    * This method clears out any SQL statements that have been populated in
 300    * the current batch.  A driver is not required to implement this method.
 301    *
 302    * @exception SQLException If an error occurs.
 303    */
 304   void clearBatch() throws SQLException;
 305
 306   /**
 307    * This method executes the SQL batch and returns an array of update
 308    * counts - one for each SQL statement in the batch - ordered in the same
 309    * order the statements were added to the batch.  A driver is not required
 310    * to implement this method.
 311    *
 312    * @return An array of update counts for this batch.
 313    * @exception SQLException If an error occurs.
 314    */
 315   int[] executeBatch() throws SQLException;
 316
 317   /**
 318    * This method returns the <code>Connection</code> instance that was
 319    * used to create this object.
 320    *
 321    * @return The connection used to create this object.
 322    * @exception SQLException If an error occurs.
 323    */
 324   Connection getConnection() throws SQLException;
 325
 326   /**
 327    * @since 1.4
 328    */
 329   boolean getMoreResults(int current) throws SQLException;
 330
 331   /**
 332    * @since 1.4
 333    */
 334   ResultSet getGeneratedKeys() throws SQLException;
 335
 336   /**
 337    * @since 1.4
 338    */
 339   int executeUpdate(String sql, int autoGeneratedKeys)
 340     throws SQLException;
 341
 342   /**
 343    * @since 1.4
 344    */
 345   int executeUpdate(String sql, int[] columnIndexes)
 346     throws SQLException;
 347
 348   /**
 349    * @since 1.4
 350    */
 351   int executeUpdate(String sql, String[] columnNames)
 352     throws SQLException;
 353
 354   /**
 355    * @since 1.4
 356    */
 357   boolean execute(String sql, int autoGeneratedKeys)
 358     throws SQLException;
 359
 360   /**
 361    * @since 1.4
 362    */
 363   boolean execute(String sql, int[] columnIndexes) throws SQLException;
 364
 365   /**
 366    * @since 1.4
 367    */
 368   boolean execute(String sql, String[] columnNames)
 369     throws SQLException;
 370
 371   /**
 372    * @since 1.4
 373    */
 374   int getResultSetHoldability() throws SQLException;
 375 }