GncSqlLotsBackend Class Reference

Inheritance diagram for GncSqlLotsBackend:

Public Member Functions
void	load_all (GncSqlBackend *) override
	Load all objects of m_type in the database into memory. More...
void	create_tables (GncSqlBackend *) override
	Conditionally create or update a database table from m_col_table. More...
bool	write (GncSqlBackend *) override
	Write all objects of m_type_name to the database. More...
Public Member Functions inherited from GncSqlObjectBackend
	GncSqlObjectBackend (int version, const std::string &type, const std::string &table, const EntryVec &vec)
virtual bool	commit (GncSqlBackend *sql_be, QofInstance *inst)
	UPDATE/INSERT a single instance of m_type_name into the database. More...
const char *	type () const noexcept
	Return the m_type_name for the class. More...
const bool	is_version (int version) const noexcept
	Compare a version with the compiled version (m_version). More...
bool	instance_in_db (const GncSqlBackend *sql_be, QofInstance *inst) const noexcept
	Check the presence of an object in the backend's database. More...

Additional Inherited Members
Protected Attributes inherited from GncSqlObjectBackend
const std::string	m_table_name
const int	m_version
const std::string	m_type_name
const EntryVec &	m_col_table
	The front-end QofIdType.

Detailed Description

Definition at line 34 of file gnc-lots-sql.h.

Member Function Documentation

create_tables()

void GncSqlLotsBackend::create_tables ( GncSqlBackend *  sql_be )

overridevirtual

Conditionally create or update a database table from m_col_table.

The condition is the version returned by querying the database's version table: If it's 0 then the table wasn't found and will be created; All tables areat least version 1. If the database's version is less than the compiled version then the table schema is upgraded but the data isn't, that's the engine's responsibility when the object is loaded. If the version is greater than the compiled version then nothing is touched.

Parameters

sql_be

The GncSqlBackend containing the database connection.

Reimplemented from GncSqlObjectBackend.

Definition at line 144 of file gnc-lots-sql.cpp.

{
    gint version;

    g_return_if_fail (sql_be != NULL);

    version = sql_be->get_table_version( TABLE_NAME);
    if (version == 0)
    {
        /* The table doesn't exist, so create it */
        (void)sql_be->create_table(TABLE_NAME, TABLE_VERSION, col_table);
    }
    else if (version < m_version)
    {
        /* Version 1 -> 2 removes the 'NOT NULL' constraint on the account_guid
        field.

        Create a temporary table, copy the data from the old table, delete the
        old table, then rename the new one. */

        sql_be->upgrade_table(TABLE_NAME, col_table);
        sql_be->set_table_version (TABLE_NAME, TABLE_VERSION);

        PINFO ("Lots table upgraded from version 1 to version %d\n", TABLE_VERSION);
    }
}

load_all()

void GncSqlLotsBackend::load_all ( GncSqlBackend *  sql_be )

overridevirtual

Load all objects of m_type in the database into memory.

Parameters

sql_be

The GncSqlBackend containing the database connection.

Implements GncSqlObjectBackend.

Definition at line 120 of file gnc-lots-sql.cpp.

{
    g_return_if_fail (sql_be != NULL);

    std::stringstream sql;
    sql << "SELECT * FROM " << TABLE_NAME;
    auto stmt = sql_be->create_statement_from_sql(sql.str());
    if (stmt != nullptr)
    {
        auto result = sql_be->execute_select_statement(stmt);
        if (result->begin () == nullptr)
            return;
        for (auto row : *result)
            load_single_lot (sql_be, row);

        auto sql = g_strdup_printf ("SELECT DISTINCT guid FROM %s",
                                   TABLE_NAME);
        gnc_sql_slots_load_for_sql_subquery (sql_be, sql, (BookLookupFn)gnc_lot_lookup);
        g_free (sql);
    }
}

write()

bool GncSqlLotsBackend::write ( GncSqlBackend *  sql_be )

overridevirtual

Write all objects of m_type_name to the database.

Parameters

sql_be

The GncSqlBackend containing the database.

Returns

true if the objects were successfully written, false otherwise.

Reimplemented from GncSqlObjectBackend.

Definition at line 183 of file gnc-lots-sql.cpp.

{
    g_return_val_if_fail (sql_be != NULL, FALSE);
    write_objects_t data{sql_be, true, this};

    qof_collection_foreach (qof_book_get_collection (sql_be->book(), GNC_ID_LOT),
                            (QofInstanceForeachCB)do_save_lot, &data);
    return data.is_ok;
}

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The documentation for this class was generated from the following files:

• gnc-lots-sql.h
• gnc-lots-sql.cpp