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If the developer opts for the RPAD() trick to convert the bind variable into something that will be comparable to the CHAR field (it is preferable, of course, to pad out the bind variable, rather than TRIM the database column, as applying the function TRIM to the column could easily make it impossible to use existing indexes on that column), she would have to be concerned with column length changes over time If the size of the field changes, then the application is impacted, as it must change its field width It is for these reasons the fixed-width storage, which tends to make the tables and related indexes much larger than normal, coupled with the bind variable issue that I avoid the CHAR type in all circumstances.

I cannot even make an argument for it in the case of the one-character field, because in that case it is really of no material difference The VARCHAR2(1) and CHAR(1) are identical in all aspects There is no compelling reason to use the CHAR type in that case, and to avoid any confusion, I just say no, even for the CHAR(1) field..

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Figure 1-2. The Table command on the Insert tab of the Ribbon 3. In the Create Table dialog box, confirm that the correct range is shown for the table, and then select a different range if necessary. 4. Leave the check mark in the box for My Table Has Headers, and then click OK. When it s created, the Excel Table is given a default name, such as Table1. You can rename the formatted Excel Table, so it will be easy to identify each table if multiple Excel Tables are in the workbook. This helps to ensure that you select the correct source data when you re creating pivot tables. To name the Excel Table, follow these instructions.

The syntax for the four basic string types is straightforward, as described in Table 12-1. Table 12-1. Four Basic String Types

The Ruby extension supports both positional and named parameter binding. You bind parameters using Statement::bind_param() and/or Statement::bind_params(). bind_param() has the following form: bind_param(param, value) If param is a Fixnum, then it represents the position (index) of the parameter. Otherwise, it is used as the name of the parameter. bind_params() takes a variable number of arguments. If the first argument is a hash, then it uses it to map parameter names to values. Otherwise, it uses each argument as a positional parameter. Listing 8-14 illustrates both forms of parameter binding. Listing 8-14. Parameter Binding in Ruby require 'sqlite3' db = SQLite3::Database.new("foods.db") db.results_as_hash = true # Named paramters

VARCHAR2( <SIZE> <BYTE|CHAR> )

A number between 1 and 4,000 for up to 4,000 bytes of storage. In the following section, we ll examine in detail the differences and nuances of the BYTE versus CHAR modifier in that clause. A number between 1 and 2,000 for up to 2,000 bytes of storage. A number greater than 0 whose upper bound is dictated by your national character set. A number greater than 0 whose upper bound is dictated by your national character set.

1. Select a cell in the formatted Excel Table, and on the Ribbon, click the Design tab. 2. At the left end of the Ribbon, in the Properties group, type a one-word name, such as SalesData, in the Table Name box (see Figure 1-3).

CHAR( <SIZE> <BYTE|CHAR> ) NVARCHAR2( <SIZE> )

stmt = db.prepare('select * from foods where name like :name') stmt.bind_param(':name', '%Peach%') stmt.execute() do |result| result.each do |row| puts row['name'] end end # Positional paramters stmt = db.prepare('select * from foods where name like or type_id = ') stmt.bind_params('%Bobka%', 1) stmt.execute() do |result| result.each do |row| puts row['name'] end end # Free read lock stmt.close() If you don t need to use parameters, a shorter way to process queries is using Database::query(), which cuts out the Statement object and just returns a ResultSet, as shown in Listing 8-14. Listing 8-14. Using the Database::query() Method in Ruby require 'sqlite3' db = SQLite3::Database.new("foods.db") db.results_as_hash = true result = db.query('select * from foods limit 10') result.each do |row| puts row['name'] end result.reset() while row = result.next puts row['name'] end result.close() Like Statement objects, Result objects are also thin wrappers over statement handles and therefore represent compiled queries. They can be rerun with a call to reset, which calls sqlite3_reset() internally and reexecutes the query. Unlike Statement objects however, they cannot be used for bound parameters. Other, even shorter, query methods include Database::get_first_row(), which returns the first row of a query, and Database::get_first_value(), which returns the first column of the first row of a query.

NCHAR( <SIZE> )

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