One should take care when checking the return value.
0 == false which is not equal with failed delete.
if(!$res)
echo "Nothing was deleted";
pg_delete
(PHP 4 >= 4.3.0, PHP 5, PHP 7, PHP 8)
pg_delete — Deletes records
Description
pg_delete(
PgSql\Connection
string
array
int
): string|bool
PgSql\Connection
$connection,string
$table_name,array
$conditions,int
$flags = PGSQL_DML_EXEC): string|bool
pg_delete() deletes records from a table
specified by the keys and values in conditions.
If flags is specified,
pg_convert() is applied to
conditions with the specified flags.
By default pg_delete() passes raw values.
Values must be escaped or the PGSQL_DML_ESCAPE flag
must be specified in flags.
PGSQL_DML_ESCAPE quotes and escapes parameters/identifiers.
Therefore, table/column names become case sensitive.
Note that neither escape nor prepared query can protect LIKE query, JSON, Array, Regex, etc. These parameters should be handled according to their contexts. i.e. Escape/validate values.
Parameters
-
connection -
An PgSql\Connection instance.
-
table_name -
Name of the table from which to delete rows.
-
conditions -
An array whose keys are field names in the table
table_name, and whose values are the values of those fields that are to be deleted. -
flags -
Any number of
PGSQL_CONV_FORCE_NULL,PGSQL_DML_NO_CONV,PGSQL_DML_ESCAPE,PGSQL_DML_EXEC,PGSQL_DML_ASYNCorPGSQL_DML_STRINGcombined. IfPGSQL_DML_STRINGis part of theflagsthen query string is returned. WhenPGSQL_DML_NO_CONVorPGSQL_DML_ESCAPEis set, it does not call pg_convert() internally.
Return Values
Returns true on success or false on failure. Returns string if PGSQL_DML_STRING is passed
via flags.
Changelog
| Version | Description |
|---|---|
| 8.1.0 |
The connection parameter expects an PgSql\Connection
instance now; previously, a resource was expected.
|
Examples
Example #1 pg_delete() example
<?php
$db = pg_connect('dbname=foo');
// This is safe somewhat, since all values are escaped.
// However PostgreSQL supports JSON/Array. These are not
// safe by neither escape nor prepared query.
$res = pg_delete($db, 'post_log', $_POST, PG_DML_ESCAPE);
if ($res) {
echo "POST data is deleted: $res\n";
} else {
echo "User must have sent wrong inputs\n";
}
?>
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