fbsql_query()
sends a query to the currently active database on the server
that's associated with the specified link identifier. If
link_identifier
isn't specified, the last opened link is assumed. If no link is
open, the function tries to establish a link as if
fbsql_connect()
was called with no arguments, and use it.
注意 The query string shall always end with a semicolon.
fbsql_query()
returns
TRUE
(non-zero) or
FALSE
to indicate whether or not the query succeeded. A return value
of
TRUE
means that the query was legal and could be executed by the
server. It does not indicate anything about the number of rows
affected or returned. It is perfectly possible for a query to
succeed but affect no rows or return no rows.
The following query is syntactically invalid, so
fbsql_query()
fails and returns
FALSE
:
The following query is semantically invalid if
my_col
is not a column in the table
my_tbl
, so
fbsql_query()
fails and returns
FALSE
:
fbsql_query()
will also fail and return
FALSE
if you don't have permission to access the table(s) referenced
by the query.
Assuming the query succeeds, you can call
fbsql_num_rows()
to find out how many rows were returned for a SELECT statment
or
fbsql_affected_rows()
to find out how many rows were affected by a DELETE, INSERT,
REPLACE, or UPDATE statement.
For SELECT statements,
fbsql_query()
returns a new result identifier that you can pass to
fbsql_result()
. When you are done with the result set, you can free the
resources associated with it by calling
fbsql_free_result()
. Although, the memory will automatically be freed at the end
of the script's execution.
See also:
fbsql_affected_rows()
,
fbsql_db_query()
,
fbsql_free_result()
,
fbsql_result()
,
fbsql_select_db()
, and
fbsql_connect()
.