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mixed mysqli_query ( object link, string query [, int resultmode])
Object oriented style (method):
class mysqli { mixed query ( string query) }
The mysqli_query() function is used to simplify the
act of performing a query against the database represented by the
link parameter.
Functionally, using this
function is identical to calling mysqli_real_query()
followed either by mysqli_use_result() or
mysqli_store_result() where query
is the query string itself and resultmode is
either the constant MYSQLI_USE_RESULT or
MYSQLI_STORE_RESULT depending
on the desired behavior. By default, if the
resultmode is not provided
MYSQLI_STORE_RESULT is used.
If you execute mysqli_query() with resultmodeMYSQLI_USE_RESULT all subsequent calls will return error
Commands out of sync unless you call mysqli_free_result().
Return values
Returns TRUE on success or FALSE on failure. For SELECT, SHOW, DESCRIBE or
EXPLAINmysqli_query() will return
a result object.
/* Create table doesn't return a resultset */ if ($mysqli->query("CREATE TEMPORARY TABLE myCity LIKE City") === TRUE) { printf("Table myCity successfully created.\n"); }
/* Select queries return a resultset */ if ($result = $mysqli->query("SELECT Name FROM City LIMIT 10")) { printf("Select returned %d rows.\n", $result->num_rows);
/* free result set */ $result->close(); }
/* If we have to retrieve large amount of data we use MYSQLI_USE_RESULT */ if ($result = $mysqli->query("SELECT * FROM City", MYSQLI_USE_RESULT)) {
/* Note, that we can't execute any functions which interact with the server until result set was closed. All calls will return an 'out of sync' error */ if (!$mysqli->query("SET @a:='this will not work'")) { printf("Error: %s\n", $mysqli->error); } $result->close(); }
/* Create table doesn't return a resultset */ if (mysqli_query($link, "CREATE TEMPORARY TABLE myCity LIKE City") === TRUE) { printf("Table myCity successfully created.\n"); }
/* Select queries return a resultset */ if ($result = mysqli_query($link, "SELECT Name FROM City LIMIT 10")) { printf("Select returned %d rows.\n", mysqli_num_rows($result));
/* free result set */ mysqli_free_result($result); }
/* If we have to retrieve large amount of data we use MYSQLI_USE_RESULT */ if ($result = mysqli_query($link, "SELECT * FROM City", MYSQLI_USE_RESULT)) {
/* Note, that we can't execute any functions which interact with the server until result set was closed. All calls will return an 'out of sync' error */ if (!mysqli_query($link, "SET @a:='this will not work'")) { printf("Error: %s\n", mysqli_error($link)); } mysqli_free_result($result); }
mysqli_close($link); ?>
The above examples would produce the following output:
Table myCity successfully created.
Select returned 10 rows.
Error: Commands out of sync; You can't run this command now
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