これは、insert() および update() を使用して SQL テーブルに null 値を挿入および更新できるようにするために、最新バージョンの wordpress から wpdb を変更するソリューションです。
/*
* Fix wpdb to allow inserting/updating of null values into tables
*/
class wpdbfixed extends wpdb
{
function insert($table, $data, $format = null) {
$type = 'INSERT';
if ( ! in_array( strtoupper( $type ), array( 'REPLACE', 'INSERT' ) ) )
return false;
$this->insert_id = 0;
$formats = $format = (array) $format;
$fields = array_keys( $data );
$formatted_fields = array();
foreach ( $fields as $field ) {
if ( !empty( $format ) )
$form = ( $form = array_shift( $formats ) ) ? $form : $format[0];
elseif ( isset( $this->field_types[$field] ) )
$form = $this->field_types[$field];
else
$form = '%s';
//***edit begin here***
if ($data[$field]===null) {
unset($data[$field]); //Remove this element from array, so we don't try to insert its value into the %s/%d/%f parts during prepare(). Without this, array would become shifted.
$formatted_fields[] = 'NULL';
} else {
$formatted_fields[] = $form; //Original line of code
}
//***edit ends here***
}
$sql = "{$type} INTO `$table` (`" . implode( '`,`', $fields ) . "`) VALUES (" . implode( ",", $formatted_fields ) . ")";
return $this->query( $this->prepare( $sql, $data ) );
}
function update($table, $data, $where, $format = null, $where_format = null)
{
if ( ! is_array( $data ) || ! is_array( $where ) )
return false;
$formats = $format = (array) $format;
$bits = $wheres = array();
foreach ( (array) array_keys( $data ) as $field ) {
if ( !empty( $format ) )
$form = ( $form = array_shift( $formats ) ) ? $form : $format[0];
elseif ( isset($this->field_types[$field]) )
$form = $this->field_types[$field];
else
$form = '%s';
//***edit begin here***
if ($data[$field]===null)
{
unset($data[$field]); //Remove this element from array, so we don't try to insert its value into the %s/%d/%f parts during prepare(). Without this, array would become shifted.
$bits[] = "`$field` = NULL";
} else {
$bits[] = "`$field` = {$form}"; //Original line of code
}
//***edit ends here***
}
$where_formats = $where_format = (array) $where_format;
foreach ( (array) array_keys( $where ) as $field ) {
if ( !empty( $where_format ) )
$form = ( $form = array_shift( $where_formats ) ) ? $form : $where_format[0];
elseif ( isset( $this->field_types[$field] ) )
$form = $this->field_types[$field];
else
$form = '%s';
$wheres[] = "`$field` = {$form}";
}
$sql = "UPDATE `$table` SET " . implode( ', ', $bits ) . ' WHERE ' . implode( ' AND ', $wheres );
return $this->query( $this->prepare( $sql, array_merge( array_values( $data ), array_values( $where ) ) ) );
}
}
global $wpdb_allow_null;
$wpdb_allow_null = new wpdbfixed(DB_USER, DB_PASSWORD, DB_NAME, DB_HOST);
このコードを functions.php などの常に実行される場所に挿入し、新しいグローバル $wpdb_allowed_null->insert() および ->update() を通常どおり使用します。
残りのWordpressや他のプラグインが期待するDBの動作を維持するために、デフォルトの$wpdbをオーバーライドするよりも、この方法で行うことを好みました。