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To delete a column that you ve created, simply click the Delete button at the bottom of the Change Column form. However, be aware that when you delete a column, you ll lose all the data stored in the column. If SharePoint created a column when you created the list, you might not be able to delete the column (the Delete button will be missing). For example, you cannot delete the Last Name column from a contacts list (unless you didn t use the SharePoint Contacts list, but used the Custom List template to create the list in the first place). You can still choose whether to display the column in a list, but it always appears on the New Item and Edit forms. If this presents a problem for users, set the default value to DO NOT USE or something similar. You can create a new view of the list to control whether a column appears in a list view, what position it appears in, how it s sorted, whether it s filtered or grouped, and a number of other options. In the next section, we ll walk through all the options for creating a new view that displays just the data you want to see, in the way that s most useful to you and your users.

WorkPlaceType +workerTypeId +logicalIndicator +physicalIndicator +code +description +activeDate +inactiveDate +getId() +getId() +getCodeDescr() +getCodeIdDescr() +getCodeIdDescr() +help() +test() +toString()

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5. Add the Execute method to DatabaseHandler. This method uses the PDOStatement::execute method to run queries that don t return records (INSERT, DELETE, or UPDATE queries): // Wrapper method for PDOStatement::execute public static function Execute($statementHandler, $params = null) { try { // Try to execute the query $statementHandler->execute($params); } catch(PDOException $e) { // Close the database handler and trigger an error self::Close(); trigger_error($e->getMessage(), E_USER_ERROR); } } 6. Add the GetAll function, which is the wrapper method for fetchAll. You ll call this function for retrieving a complete result set from a SELECT query. // Wrapper method for PDOStatement::fetchAll public static function GetAll($statementHandler, $params = null, $fetchStyle = PDO::FETCH_ASSOC) { // Initialize the return value to null $result = null; // Try executing the prepared statement received as parameter try { self::Execute($statementHandler, $params); $result = $statementHandler->fetchAll($fetchStyle); } catch(PDOException $e) { // Close the database handler and trigger an error self::Close(); trigger_error($e->getMessage(), E_USER_ERROR); } // Return the query results return $result; }

PhysicalWorkplace +physicalWorkplaceId +parentId +idContext +workplaceTypeId +code +name +activeDate +inactiveDate +createIdContext() +getId() +getCodeContext() +getNameContext() +getRow() +help() +setRow() +test() +toString()

7. Add the GetRow function, which is the wrapper class for fetchRow, as shown. This will be used to get a row of data resulted from a SELECT query. // Wrapper method for PDOStatement::fetch public static function GetRow($statementHandler, $params = null, $fetchStyle = PDO::FETCH_ASSOC) { // Initialize the return value to null $result = null; // Try executing the prepared statement received as parameter try { self::Execute($statementHandler, $params); $result = $statementHandler->fetch($fetchStyle); } catch(PDOException $e) { // Close the database handler and trigger an error self::Close(); trigger_error($e->getMessage(), E_USER_ERROR); } // Return the query results return $result; } 8. Add the GetOne function, which is the wrapper class for fetch, as shown. This will be used to get a single value resulted from a SELECT query. // Return the first column value from a row public static function GetOne($statementHandler, $params = null) { // Initialize the return value to null $result = null; // Try executing the prepared statement received as parameter try { /* Execute the query, and save the first value of the result set (first column of the first row) to $result */ self::Execute($statementHandler, $params); $result = $statementHandler->fetch(PDO::FETCH_NUM); $result = $result[0]; } catch(PDOException $e) {

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