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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 timeouts. * 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"; * } * * // 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 ); * } * * $error_count = 0; * $tablename = $wpdb->links; * * 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( __DIR__ ) . '/wp-load.php'; if ( ! function_exists( 'maybe_create_table' ) ) : /* * Creates a table in the database 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 SQL statement to create table. * @return bool True on success or if the table already exists. False on failure. / 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. // phpcs:ignore WordPress.DB.PreparedSQL.NotPrepared -- No applicable variables for this query. $wpdb->query( $create_ddl ); // We cannot directly tell 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' ) ) : /* * Adds column to 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 $column_name Table column name. * @param string $create_ddl SQL statement to add column. * @return bool True on success or if the column already exists. False on failure. / function maybe_add_column( $table_name, $column_name, $create_ddl ) { global $wpdb; // phpcs:ignore WordPress.DB.PreparedSQL.InterpolatedNotPrepared -- Cannot be prepared. Fetches columns for table names. 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. // phpcs:ignore WordPress.DB.PreparedSQL.NotPrepared -- No applicable variables for this query. $wpdb->query( $create_ddl ); // We cannot directly tell whether this succeeded! // phpcs:ignore WordPress.DB.PreparedSQL.InterpolatedNotPrepared -- Cannot be prepared. Fetches columns for table names. foreach ( $wpdb->get_col( "DESC $table_name", 0 ) as $column ) { if ( $column === $column_name ) { return true; } } return false; } endif; /* * Drops column from database table, if it exists. * * @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 $drop_ddl SQL statement to drop column. * @return bool True on success or if the column doesn't exist. False on failure. / function maybe_drop_column( $table_name, $column_name, $drop_ddl ) { global $wpdb; // phpcs:ignore WordPress.DB.PreparedSQL.InterpolatedNotPrepared -- Cannot be prepared. Fetches columns for table names. foreach ( $wpdb->get_col( "DESC $table_name", 0 ) as $column ) { if ( $column === $column_name ) { // Found it, so try to drop it. // phpcs:ignore WordPress.DB.PreparedSQL.NotPrepared -- No applicable variables for this query. $wpdb->query( $drop_ddl ); // We cannot directly tell whether this succeeded! // phpcs:ignore WordPress.DB.PreparedSQL.InterpolatedNotPrepared -- Cannot be prepared. Fetches columns for table names. foreach ( $wpdb->get_col( "DESC $table_name", 0 ) as $column ) { if ( $column === $column_name ) { return false; } } } } // Else didn't find it. return true; } /* * Checks that database table column matches the 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 as listed: * * - Field * - Type * - Null * - Key * - Default * - Extra * * @since 1.0.0 * * @global wpdb $wpdb WordPress database abstraction object. * * @param string $table_name Database table name. * @param string $col_name Table column name. * @param string $col_type Table column type. * @param bool $is_null Optional. Check is null. * @param mixed $key Optional. Key info. * @param mixed $default_value 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_value = null, $extra = null ) { global $wpdb; $diffs = 0; // phpcs:ignore WordPress.DB.PreparedSQL.InterpolatedNotPrepared -- Cannot be prepared. Fetches columns for table names. $results = $wpdb->get_results( "DESC $table_name" ); foreach ( $results as $row ) { if ( $row->Field === $col_name ) { // Got our column, check the params. if ( ( null !== $col_type ) && ( $row->Type !== $col_type ) ) { ++$diffs; } if ( ( null !== $is_null ) && ( $row->Null !== $is_null ) ) { ++$diffs; } if ( ( null !== $key ) && ( $row->Key !== $key ) ) { ++$diffs; } if ( ( null !== $default_value ) && ( $row->Default !== $default_value ) ) { ++$diffs; } if ( ( null !== $extra ) && ( $row->Extra !== $extra ) ) { ++$diffs; } if ( $diffs > 0 ) { return false; } return true; } // End if found our column. } return false; }

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