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+<?php
+/**
+ * Plugins may load this file to gain access to special helper functions for
+ * plugin installation. This file is not included by WordPress and it is
+ * recommended, to prevent fatal errors, that this file is included using
+ * require_once().
+ *
+ * These functions are not optimized for speed, but they should only be used
+ * once in a while, so speed shouldn't be a concern. If it is and you are
+ * needing to use these functions a lot, you might experience time outs. If you
+ * do, then it is advised to just write the SQL code yourself.
+ *
+ * check_column( 'wp_links', 'link_description', 'mediumtext' );
+ * if ( check_column( $wpdb->comments, 'comment_author', 'tinytext' ) ) {
+ * echo "ok\n";
+ * }
+ *
+ * $error_count = 0;
+ * $tablename = $wpdb->links;
+ * // Check the column.
+ * if ( ! check_column($wpdb->links, 'link_description', 'varchar( 255 )' ) ) {
+ * $ddl = "ALTER TABLE $wpdb->links MODIFY COLUMN link_description varchar(255) NOT NULL DEFAULT '' ";
+ * $q = $wpdb->query( $ddl );
+ * }
+ *
+ * if ( check_column( $wpdb->links, 'link_description', 'varchar( 255 )' ) ) {
+ * $res .= $tablename . ' - ok <br />';
+ * } else {
+ * $res .= 'There was a problem with ' . $tablename . '<br />';
+ * ++$error_count;
+ * }
+ *
+ * @package WordPress
+ * @subpackage Plugin
+ */
+
+/** Load WordPress Bootstrap */
+require_once( dirname( dirname( __FILE__ ) ) . '/wp-load.php' );
+
+if ( ! function_exists( 'maybe_create_table' ) ) :
+ /**
+ * Create database table, if it doesn't already exist.
+ *
+ * @since 1.0.0
+ *
+ * @global wpdb $wpdb WordPress database abstraction object.
+ *
+ * @param string $table_name Database table name.
+ * @param string $create_ddl Create database table SQL.
+ * @return bool False on error, true if already exists or success.
+ */
+ function maybe_create_table( $table_name, $create_ddl ) {
+ global $wpdb;
+ foreach ( $wpdb->get_col( 'SHOW TABLES', 0 ) as $table ) {
+ if ( $table == $table_name ) {
+ return true;
+ }
+ }
+ // Didn't find it, so try to create it.
+ $wpdb->query( $create_ddl );
+
+ // We cannot directly tell that whether this succeeded!
+ foreach ( $wpdb->get_col( 'SHOW TABLES', 0 ) as $table ) {
+ if ( $table == $table_name ) {
+ return true;
+ }
+ }
+ return false;
+ }
+endif;
+
+if ( ! function_exists( 'maybe_add_column' ) ) :
+ /**
+ * Add column to database table, if column doesn't already exist in table.
+ *
+ * @since 1.0.0
+ *
+ * @global wpdb $wpdb WordPress database abstraction object.
+ *
+ * @param string $table_name Database table name
+ * @param string $column_name Table column name
+ * @param string $create_ddl SQL to add column to table.
+ * @return bool False on failure. True, if already exists or was successful.
+ */
+ function maybe_add_column( $table_name, $column_name, $create_ddl ) {
+ global $wpdb;
+ foreach ( $wpdb->get_col( "DESC $table_name", 0 ) as $column ) {
+
+ if ( $column == $column_name ) {
+ return true;
+ }
+ }
+
+ // Didn't find it, so try to create it.
+ $wpdb->query( $create_ddl );
+
+ // We cannot directly tell that whether this succeeded!
+ foreach ( $wpdb->get_col( "DESC $table_name", 0 ) as $column ) {
+ if ( $column == $column_name ) {
+ return true;
+ }
+ }
+ return false;
+ }
+endif;
+
+/**
+ * Drop column from database table, if it exists.
+ *
+ * @since 1.0.0
+ *
+ * @global wpdb $wpdb WordPress database abstraction object.
+ *
+ * @param string $table_name Table name
+ * @param string $column_name Column name
+ * @param string $drop_ddl SQL statement to drop column.
+ * @return bool False on failure, true on success or doesn't exist.
+ */
+function maybe_drop_column( $table_name, $column_name, $drop_ddl ) {
+ global $wpdb;
+ foreach ( $wpdb->get_col( "DESC $table_name", 0 ) as $column ) {
+ if ( $column == $column_name ) {
+
+ // Found it, so try to drop it.
+ $wpdb->query( $drop_ddl );
+
+ // We cannot directly tell that whether this succeeded!
+ foreach ( $wpdb->get_col( "DESC $table_name", 0 ) as $column ) {
+ if ( $column == $column_name ) {
+ return false;
+ }
+ }
+ }
+ }
+ // Else didn't find it.
+ return true;
+}
+
+/**
+ * Check column matches criteria.
+ *
+ * Uses the SQL DESC for retrieving the table info for the column. It will help
+ * understand the parameters, if you do more research on what column information
+ * is returned by the SQL statement. Pass in null to skip checking that
+ * criteria.
+ *
+ * Column names returned from DESC table are case sensitive and are listed:
+ * Field
+ * Type
+ * Null
+ * Key
+ * Default
+ * Extra
+ *
+ * @since 1.0.0
+ *
+ * @global wpdb $wpdb WordPress database abstraction object.
+ *
+ * @param string $table_name Table name
+ * @param string $col_name Column name
+ * @param string $col_type Column type
+ * @param bool $is_null Optional. Check is null.
+ * @param mixed $key Optional. Key info.
+ * @param mixed $default Optional. Default value.
+ * @param mixed $extra Optional. Extra value.
+ * @return bool True, if matches. False, if not matching.
+ */
+function check_column( $table_name, $col_name, $col_type, $is_null = null, $key = null, $default = null, $extra = null ) {
+ global $wpdb;
+ $diffs = 0;
+ $results = $wpdb->get_results( "DESC $table_name" );
+
+ foreach ( $results as $row ) {
+
+ if ( $row->Field == $col_name ) {
+
+ // Got our column, check the params.
+ if ( ( $col_type != null ) && ( $row->Type != $col_type ) ) {
+ ++$diffs;
+ }
+ if ( ( $is_null != null ) && ( $row->Null != $is_null ) ) {
+ ++$diffs;
+ }
+ if ( ( $key != null ) && ( $row->Key != $key ) ) {
+ ++$diffs;
+ }
+ if ( ( $default != null ) && ( $row->Default != $default ) ) {
+ ++$diffs;
+ }
+ if ( ( $extra != null ) && ( $row->Extra != $extra ) ) {
+ ++$diffs;
+ }
+ if ( $diffs > 0 ) {
+ return false;
+ }
+ return true;
+ } // end if found our column
+ }
+ return false;
+}