gecko/storage/public/mozIStorageStatement.idl

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 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
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 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
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 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
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 *
 * The Original Code is Oracle Corporation code.
 *
 * The Initial Developer of the Original Code is
 *  Oracle Corporation
 * Portions created by the Initial Developer are Copyright (C) 2004
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Vladimir Vukicevic <vladimir.vukicevic@oracle.com>
 *
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 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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#include "nsISupports.idl"
#include "mozIStorageValueArray.idl"

interface mozIStorageConnection;
interface nsISimpleEnumerator;
interface mozIStorageStatementCallback;
interface mozIStoragePendingStatement;

[scriptable, uuid(471e161a-af46-4eb3-adf6-f6b0c41fe81c)]
interface mozIStorageStatement : mozIStorageValueArray {
  /**
   * Finalizes a statement so you can successfully close a database connection.
   * This method does not need to be used from native callers since you can just
   * set the statement to null, but is extremely useful to JS callers.
   */
  void finalize();

  /**
   * Create a clone of this statement, by initializing a new statement
   * with the same connection and same SQL statement as this one.  It
   * does not preserve statement state; that is, if a statement is
   * being executed when it is cloned, the new statement will not be
   * executing.
   */
  mozIStorageStatement clone();

  /*
   * Number of parameters
   */
  readonly attribute unsigned long parameterCount;

  /**
   * Name of nth parameter, if given
   */
  AUTF8String getParameterName(in unsigned long aParamIndex);

  /**
   * Returns the index of the named parameter.
   *
   * @param aName The name of the parameter you want the index for.
   * @return The index of the named parameter.
   */
  unsigned long getParameterIndex(in AUTF8String aName);

  /**
   * Number of columns returned
   */
  readonly attribute unsigned long columnCount;

  /**
   * Name of nth column
   */
  AUTF8String getColumnName(in unsigned long aColumnIndex);

  /**
   * Obtains the index of the column with the specified name.
   *
   * @param aName The name of the column.
   * @return The index of the column with the specified name.
   */
  unsigned long getColumnIndex(in AUTF8String aName);

  /**
   * Obtains the declared column type of a prepared statement.
   *
   * @param aParamIndex The zero-based index of the column who's declared type
   *                    we are interested in.
   * @returns the declared index type.
   */
  AUTF8String getColumnDecltype(in unsigned long aParamIndex);

  /**
   * Reset parameters/statement execution
   */
  void reset();

  /**
   * Bind the given value to the parameter at aParamIndex. Index 0
   * denotes the first numbered argument or ?1.
   */
  void bindUTF8StringParameter(in unsigned long aParamIndex,
                               in AUTF8String aValue);
  void bindStringParameter(in unsigned long aParamIndex, in AString aValue);
  void bindDoubleParameter(in unsigned long aParamIndex, in double aValue);
  void bindInt32Parameter(in unsigned long aParamIndex, in long aValue);
  void bindInt64Parameter(in unsigned long aParamIndex, in long long aValue);
  void bindNullParameter(in unsigned long aParamIndex);
  void bindBlobParameter(in unsigned long aParamIndex,
                         [array,const,size_is(aValueSize)] in octet aValue,
                         in unsigned long aValueSize);

  /**
   * Execute the query, ignoring any results.  This is accomplished by
   * calling step() once, and then calling reset().
   *
   * Error and last insert info, etc. are available from
   * the mozStorageConnection.
   */
  void execute();

  /**
   * Execute a query, using any currently-bound parameters.  Reset
   * must be called on the statement after the last call of
   * executeStep.
   *
   * @returns a boolean indicating whether there are more rows or not;
   * row data may be accessed using mozIStorageValueArray methods on
   * the statement.
   *
   */
  boolean executeStep();

  /**
   * Execute a query, using any currently-bound parameters.  Reset is called
   * when no more data is returned.  This method is only available to JavaScript
   * consumers.
   *
   * @returns a boolean indicating whether there are more rows or not.
   *
   * boolean step();
   */

  /**
   * Obtains the current list of named parameters, which are settable.  This
   * property is only available to JavaScript consumers.
   *
   * readonly attribute mozIStorageStatementParams params;
   */

  /**
   * Obtains the current row, with access to all the data members by name.  This
   * property is only available to JavaScript consumers.
   *
   * readonly attribute mozIStorageStatementRow row;
   */

  /**
   * Execute a query asynchronously using any currently bound parameters.  This
   * statement can be reused immediately, and reset does not need to be called.
   *
   * Note:  If you have any custom defined functions, they must be re-entrant
   *        since they can be called on multiple threads.
   *
   * @param aCallback [optional]
   *        The callback object that will be notified of progress, errors, and
   *        completion.
   * @returns an object that can be used to cancel the statements execution.
   */
  mozIStoragePendingStatement executeAsync(
    [optional] in mozIStorageStatementCallback aCallback
  );

  /**
   * The current state.  Row getters are only valid while
   * the statement is in the "executing" state.
   */
  const long MOZ_STORAGE_STATEMENT_INVALID = 0;
  const long MOZ_STORAGE_STATEMENT_READY = 1;
  const long MOZ_STORAGE_STATEMENT_EXECUTING = 2;

  readonly attribute long state;

  /**
   * Escape a string for SQL LIKE search.
   *
   * @param     aValue the string to escape for SQL LIKE 
   * @param     aEscapeChar the escape character
   * @returns   an AString of an escaped version of aValue
   *            (%, _ and the escape char are escaped with the escape char)
   *            For example, we will convert "foo/bar_baz%20cheese" 
   *            into "foo//bar/_baz/%20cheese" (if the escape char is '/').
   * @note      consumers will have to use same escape char
   *            when doing statements such as:   ...LIKE '?1' ESCAPE '/'...
   */
  AString escapeStringForLIKE(in AString aValue, in wchar aEscapeChar);
};