gecko-dev/storage/mozIStorageStatement.idl

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 * vim: sw=2 ts=2 sts=2 expandtab
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "mozIStorageBaseStatement.idl"
%{C++
#include "mozilla/DebugOnly.h"
%}

[ptr] native octetPtr(uint8_t);

/**
 * A SQL statement that can be used for both synchronous and asynchronous
 * purposes.
 */
[scriptable, builtinclass, uuid(5f567c35-6c32-4140-828c-683ea49cfd3a)]
interface mozIStorageStatement : mozIStorageBaseStatement {
  /**
   * 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.  This does not
   *        include the leading ':'.
   * @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);

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

  /**
   * Execute the query, ignoring any results.  This is accomplished by
   * calling executeStep() 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.
   *
   * @return 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.
   *
   * @deprecated As of Mozilla 1.9.2 in favor of executeStep().
   *
   * @return a boolean indicating whether there are more rows or not.
   *
   * [deprecated] 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;
   */

  //////////////////////////////////////////////////////////////////////////////
  //// Copied contents of mozIStorageValueArray

  /**
   * These type values are returned by getTypeOfIndex
   * to indicate what type of value is present at
   * a given column.
   */
  const long VALUE_TYPE_NULL = 0;
  const long VALUE_TYPE_INTEGER = 1;
  const long VALUE_TYPE_FLOAT = 2;
  const long VALUE_TYPE_TEXT = 3;
  const long VALUE_TYPE_BLOB = 4;

  /**
   * The number of entries in the array (each corresponding to a column in the
   * database row)
   */
  readonly attribute unsigned long numEntries;

  /**
   * Indicate the data type of the current result row for the the given column.
   * SQLite will perform type conversion if you ask for a value as a different
   * type than it is stored as.
   *
   * @param aIndex
   *        0-based column index.
   * @return The type of the value at the given column index; one of
   *         VALUE_TYPE_NULL, VALUE_TYPE_INTEGER, VALUE_TYPE_FLOAT,
   *         VALUE_TYPE_TEXT, VALUE_TYPE_BLOB.
   */
  long getTypeOfIndex(in unsigned long aIndex);

  /**
   * Retrieve the contents of a column from the current result row as a
   * variant.
   *
   * @param aIndex
   *        0-based colummn index.
   * @return A variant with the type of the column value.
   */
  nsIVariant getVariant(in unsigned long aIndex);

  /**
   * Retrieve the contents of a column from the current result row as an
   * integer.
   *
   * @param aIndex
   *        0-based colummn index.
   * @return Column value interpreted as an integer per type conversion rules.
   * @{
   */
  long getInt32(in unsigned long aIndex);
  long long getInt64(in unsigned long aIndex);
  /** @} */
  /**
   * Retrieve the contents of a column from the current result row as a
   * floating point double.
   *
   * @param aIndex
   *        0-based colummn index.
   * @return Column value interpreted as a double per type conversion rules.
   */
  double getDouble(in unsigned long aIndex);
  /**
   * Retrieve the contents of a column from the current result row as a
   * string.
   *
   * @param aIndex
   *        0-based colummn index.
   * @return The value for the result column interpreted as a string.  If the
   *         stored value was NULL, you will get an empty string with IsVoid set
   *         to distinguish it from an explicitly set empty string.
   * @{
   */
  AUTF8String getUTF8String(in unsigned long aIndex);
  AString getString(in unsigned long aIndex);
  /** @} */

  /**
   * Retrieve the contents of a column from the current result row as a
   * blob.
   *
   * @param aIndex
   *        0-based colummn index.
   * @param[out] aDataSize
   *             The number of bytes in the blob.
   * @param[out] aData
   *             The contents of the BLOB.  This will be NULL if aDataSize == 0.
   */
  void getBlob(in unsigned long aIndex, out unsigned long aDataSize, [array,size_is(aDataSize)] out octet aData);

  /**
   * Retrieve the contents of a Blob column from the current result row as a
   * string.
   *
   * @param aIndex
   *        0-based colummn index.
   * @return The value for the result Blob column interpreted as a String.
   *         No encoding conversion is performed.
   */
  AString getBlobAsString(in unsigned long aIndex);

  /**
   * Retrieve the contents of a Blob column from the current result row as a
   * UTF8 string.
   *
   * @param aIndex
   *        0-based colummn index.
   * @return The value for the result Blob column interpreted as a UTF8 String.
   *         No encoding conversion is performed.
   */
  AUTF8String getBlobAsUTF8String(in unsigned long aIndex);

  /**
   * Check whether the given column in the current result row is NULL.
   *
   * @param aIndex
   *        0-based colummn index.
   * @return true if the value for the result column is null.
   */
  boolean getIsNull(in unsigned long aIndex);

  /**
   * Returns a shared string pointer.
   *
   * @param aIndex
   *        0-based colummn index.
   * @param aByteLength
   *        The number of bytes in the string or blob. This is the same as the
   *        number of characters for UTF-8 strings, and twice the number of
   *        characters for UTF-16 strings.
   * @param aResult
   *        A pointer to the string or blob.
   */
  [noscript] void getSharedUTF8String(in unsigned long aIndex, out unsigned long aByteLength, [shared,retval] out string aResult);
  [noscript] void getSharedString(in unsigned long aIndex, out unsigned long aByteLength, [shared,retval] out wstring aResult);
  [noscript] void getSharedBlob(in unsigned long aIndex, out unsigned long aByteLength, [shared,retval] out octetPtr aResult);

  /**
   * Getters for native code that return their values as
   * the return type, for convenience and sanity.
   *
   * Not virtual; no vtable bloat.
   */

%{C++
  inline int32_t AsInt32(uint32_t idx) {
    int32_t v = 0;
    mozilla::DebugOnly<nsresult> rv = GetInt32(idx, &v);
    MOZ_ASSERT(NS_SUCCEEDED(rv) || IsNull(idx),
               "Getting value failed, wrong column index?");
    return v;
  }

  inline int64_t AsInt64(uint32_t idx) {
    int64_t v = 0;
    mozilla::DebugOnly<nsresult> rv = GetInt64(idx, &v);
    MOZ_ASSERT(NS_SUCCEEDED(rv) || IsNull(idx),
               "Getting value failed, wrong column index?");
    return v;
  }

  inline double AsDouble(uint32_t idx) {
    double v = 0.0;
    mozilla::DebugOnly<nsresult> rv = GetDouble(idx, &v);
    MOZ_ASSERT(NS_SUCCEEDED(rv) || IsNull(idx),
               "Getting value failed, wrong column index?");
    return v;
  }

  inline const char* AsSharedUTF8String(uint32_t idx, uint32_t *len) {
    const char *str = nullptr;
    *len = 0;
    mozilla::DebugOnly<nsresult> rv = GetSharedUTF8String(idx, len, &str);
    MOZ_ASSERT(NS_SUCCEEDED(rv) || IsNull(idx),
               "Getting value failed, wrong column index?");
    return str;
  }

  inline const char16_t* AsSharedWString(uint32_t idx, uint32_t *len) {
    const char16_t *str = nullptr;
    *len = 0;
    mozilla::DebugOnly<nsresult> rv = GetSharedString(idx, len, &str);
    MOZ_ASSERT(NS_SUCCEEDED(rv) || IsNull(idx),
               "Getting value failed, wrong column index?");
    return str;
  }

  inline const uint8_t* AsSharedBlob(uint32_t idx, uint32_t *len) {
    const uint8_t *blob = nullptr;
    *len = 0;
    mozilla::DebugOnly<nsresult> rv = GetSharedBlob(idx, len, &blob);
    MOZ_ASSERT(NS_SUCCEEDED(rv) || IsNull(idx),
               "Getting value failed, wrong column index?");
    return blob;
  }

  inline bool IsNull(uint32_t idx) {
    bool b = false;
    mozilla::DebugOnly<nsresult> rv = GetIsNull(idx, &b);
    MOZ_ASSERT(NS_SUCCEEDED(rv),
               "Getting value failed, wrong column index?");
    return b;
  }

%}
};