From 5b312edb31f5b42c3089be8e6a3cb63c6e6f0a6f Mon Sep 17 00:00:00 2001
From: hongshibao <shibaohong@outlook.com>
Date: Mon, 26 Oct 2015 01:38:29 +0800
Subject: [PATCH] Add Comments

---
 include/SQLiteCpp/Backup.h | 75 +++++++++++++++++++++++++++++++++++++-
 1 file changed, 74 insertions(+), 1 deletion(-)

diff --git a/include/SQLiteCpp/Backup.h b/include/SQLiteCpp/Backup.h
index e260d1d..11ca01f 100644
--- a/include/SQLiteCpp/Backup.h
+++ b/include/SQLiteCpp/Backup.h
@@ -39,31 +39,104 @@ namespace SQLite
 class Backup
 {
 public:
+    /**
+     * @brief Initialize a SQLite Backup object.
+     *
+     * Initialize a SQLite Backup object for the source database and destination database.
+     * The database name is "main" for the main database, "temp" for the temporary database,
+     * or the name specified after the AS keyword in an ATTACH statement for an attached database.
+     *
+     * Exception is thrown in case of error, then the Backup object is NOT constructed.
+     *
+     * @param[in] aDestDatabase        Destination database connection
+     * @param[in] apDestDatabaseName   Destination database name
+     * @param[in] aSrcDatabase         Source database connection
+     * @param[in] apSrcDatabaseName    Source database name
+     *
+     * @throw SQLite::Exception in case of error
+     */
     Backup(Database&   aDestDatabase,
            const char* apDestDatabaseName,
            Database&   aSrcDatabase,
            const char* apSrcDatabaseName);
 
+    /**
+     * @brief Initialize a SQLite Backup object.
+     *
+     * Initialize a SQLite Backup object for source database and destination database.
+     * The database name is "main" for the main database, "temp" for the temporary database,
+     * or the name specified after the AS keyword in an ATTACH statement for an attached database.
+     *
+     * Exception is thrown in case of error, then the Backup object is NOT constructed.
+     *
+     * @param[in] aDestDatabase        Destination database connection
+     * @param[in] aDestDatabaseName    Destination database name
+     * @param[in] aSrcDatabase         Source database connection
+     * @param[in] aSrcDatabaseName     Source database name
+     *
+     * @throw SQLite::Exception in case of error
+     */
     Backup(Database&          aDestDatabase,
            const std::string& aDestDatabaseName,
            Database&          aSrcDatabase,
            const std::string& aSrcDatabaseName);
 
+    /**
+     * @brief Initialize a SQLite Backup object for main databases.
+     *
+     * Initialize a SQLite Backup object for source database and destination database.
+     * Backup the main databases between the source and the destination.
+     *
+     * Exception is thrown in case of error, then the Backup object is NOT constructed.
+     *
+     * @param[in] aDestDatabase        Destination database connection
+     * @param[in] aSrcDatabase         Source database connection
+     *
+     * @throw SQLite::Exception in case of error
+     */
     Backup(Database& aDestDatabase,
            Database& aSrcDatabase);
 
+    /**
+     * @brief Release the SQLite Backup resource.
+     */
     virtual ~Backup() noexcept;
 
+    /**
+     * @brief Execute a step of backup with a given number of source pages to be copied
+     *
+     * Exception is thrown when SQLITE_IOERR_XXX, SQLITE_NOMEM, or SQLITE_READONLY is returned
+     * in sqlite3_backup_step(). These errors are considered fatal, so there is no point
+     * in retrying the call to executeStep().
+     *
+     * @param[in] aNumPage    The number of source pages to be copied, with a negative value meaning all remaining source pages
+     *
+     * @return SQLITE_OK/SQLITE_DONE/SQLITE_BUSY/SQLITE_LOCKED
+     *
+     * @throw SQLite::Exception in case of error
+     */
     int executeStep(const int aNumPage = -1);
 
+    /**
+     * @brief Get the remaining number of source pages to be copied.
+     *
+     * @return the remaining number of source pages to be copied
+     */
     int remainingPageCount();
 
+    /**
+     * @brief Get the total number of source pages.
+     *
+     * @return the total number of source pages
+     */
     int totalPageCount();
 
     /**
      * @brief Return raw pointer to SQLite Database Backup Handle.
      *
      * This is often needed to mix this wrapper with other libraries or for advance usage not supported by SQLiteCpp.
+     *
+     * @return Raw pointer to SQLite Backup Handle
     */
     inline sqlite3_backup* getHandle() const noexcept // nothrow
     {
@@ -77,7 +150,7 @@ private:
     /// @}
 
 private:
-    sqlite3_backup* mpSQLiteBackup;
+    sqlite3_backup* mpSQLiteBackup;   //!< Pointer to SQLite Database Backup Handle
 };
 
 }  // namespace SQLite