这不是什么$wpdb->update() 方法实现。

如果有无法在API中表示的自定义SQL查询，则可以使用泛型按原样运行$wpdb->query().

无法使用NOT EQUAL 在里面$wpdb->update(). 下面查看的源代码update 方法-

public function update( $table, $data, $where, $format = null, $where_format = null ) {
    if ( ! is_array( $data ) || ! is_array( $where ) ) {
        return false;
    }

    $data = $this->process_fields( $table, $data, $format );
    if ( false === $data ) {
        return false;
    }
    $where = $this->process_fields( $table, $where, $where_format );
    if ( false === $where ) {
        return false;
    }

    $fields = $conditions = $values = array();
    foreach ( $data as $field => $value ) {
        if ( is_null( $value[\'value\'] ) ) {
            $fields[] = "`$field` = NULL";
            continue;
        }

        $fields[] = "`$field` = " . $value[\'format\'];
        $values[] = $value[\'value\'];
    }
    foreach ( $where as $field => $value ) {
        if ( is_null( $value[\'value\'] ) ) {
            $conditions[] = "`$field` IS NULL";
            continue;
        }

        $conditions[] = "`$field` = " . $value[\'format\'];
        $values[] = $value[\'value\'];
    }

    $fields = implode( \', \', $fields );
    $conditions = implode( \' AND \', $conditions );

    $sql = "UPDATE `$table` SET $fields WHERE $conditions";

    $this->check_current_query = false;
    return $this->query( $this->prepare( $sql, $values ) );
}