Function mdb_register_backend 

pub unsafe extern "C" fn mdb_register_backend(
    mdb: *mut MdbHandle,
    backend_name: *mut c_char,
    capabilities: guint32,
    backend_type: *const MdbBackendType,
    type_shortdate: *const MdbBackendType,
    type_autonum: *const MdbBackendType,
    short_now: *const c_char,
    long_now: *const c_char,
    date_fmt: *const c_char,
    shortdate_fmt: *const c_char,
    charset_statement: *const c_char,
    drop_statement: *const c_char,
    constaint_not_empty_statement: *const c_char,
    column_comment_statement: *const c_char,
    per_column_comment_statement: *const c_char,
    table_comment_statement: *const c_char,
    per_table_comment_statement: *const c_char,
    quote_schema_name: Option<unsafe extern "C" fn(arg1: *const gchar, arg2: *const gchar) -> *mut gchar>,
)