pg_update

Update table

&reftitle.description; ``string``bool```pg_update` `PgSql\Connection` `connection` `string` `table_name` `array` `values` `array` `conditions` `int` `flags` `PGSQL_DML_EXEC`

`pg_update` updates records that matches `conditions` with `values`.

If `flags` is specified, `pg_convert` is applied to `values` with the specified flags.

By default `pg_update` 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.

&reftitle.parameters;

`connection`

- &pgsql.parameter.connection;

`table_name`

- Name of the table into which to update rows.

`values`

- An `array` whose keys are field names in the table `table_name`, and whose values are what matched rows are to be updated to.

`conditions`

- An `array` whose keys are field names in the table `table_name`, and whose values are the conditions that a row must meet to be updated.

`flags`

- Any number of `PGSQL_CONV_FORCE_NULL`, `PGSQL_DML_NO_CONV`, `PGSQL_DML_ESCAPE`, `PGSQL_DML_EXEC`, `PGSQL_DML_ASYNC` or `PGSQL_DML_STRING` combined. If `PGSQL_DML_STRING` is part of the `flags` then query string is returned. When `PGSQL_DML_NO_CONV` or `PGSQL_DML_ESCAPE` is set, it does not call `pg_convert` internally.

&reftitle.returnvalues;

&return.success; Returns `string` if `PGSQL_DML_STRING` is passed via `flags`.

&reftitle.changelog;

&Version; | &Description;
&pgsql.changelog.connection-object;

&reftitle.examples;

### `pg_update` example

    <?php
      $db = pg_connect('dbname=foo');
      $data = array('field1'=>'AA', 'field2'=>'BB');
      // This is safe somewhat, since all values are escaped.
      // However PostgreSQL supports JSON/Array. These are not
      // safe by neither escape nor prepared query.
      $res = pg_update($db, 'post_log', $_POST, $data);
      if ($res) {
          echo "Data is updated: $res\n";
      } else {
          echo "User must have sent wrong inputs\n";
      }
    ?>

&reftitle.seealso;

- `pg_convert`