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The Ruby extension follows the SQLite API quite closely. It offers both prepared queries and wrapped queries. Prepared queries are performed via Database::prepare(), which passes back a Statement object, which holds a sqlite3_stmt structure. You execute the query using Statement s execute method, which produces a ResultSet object. You can pass the Statement a block, in which case it will yield the ResultSet object to the block. If you don t use a block, then the Statement will provide the ResultSet object as a return value. ResultSet is used to iterate over the returned rows. Internally, it uses sqlite3_step(). You can get at the rows in ResultSet either through a block using the each() iterator or by using a conventional loop with the next() method, which returns the next record in the form of an array or nil if it has reached the end of the set. Listing 8-13 shows prepared queries in action in Ruby.

ops$tkyte@ORA11GR2> select * from t; CHAR_COLUMN VARCHAR2_COLUMN -------------------- -------------------Hello World Hello World ops$tkyte@ORA11GR2> select * from t where char_column = 'Hello World'; CHAR_COLUMN VARCHAR2_COLUMN -------------------- -------------------Hello World Hello World ops$tkyte@ORA11GR2> select * from t where varchar2_column = 'Hello World'; CHAR_COLUMN VARCHAR2_COLUMN -------------------- -------------------Hello World Hello World So far, the columns look identical but, in fact, some implicit conversion has taken place and the CHAR(11) literal Hello World has been promoted to a CHAR(20) and blank padded when compared to the CHAR column. This must have happened since Hello World is not the same as Hello World without the trailing spaces. We can confirm that these two strings are materially different: ops$tkyte@ORA11GR2> select * from t where char_column = varchar2_column; no rows selected They are not equal to each other. We would have to either blank pad out the VARCHAR2_COLUMN to be 20 bytes in length or trim the trailing blanks from the CHAR_COLUMN, as follows: ops$tkyte@ORA11GR2> select * from t where trim(char_column) = varchar2_column; CHAR_COLUMN VARCHAR2_COLUMN -------------------- -------------------Hello World Hello World ops$tkyte@ORA11GR2> select * from t where char_column = rpad( varchar2_column, 20 ); CHAR_COLUMN VARCHAR2_COLUMN -------------------- -------------------Hello World Hello World

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In Excel 2007, you can create a formatted Excel Table from the data. This replaces the Excel List feature found in Excel 2003, and it includes many new features that will make pivot table creation and updating easier. To create the Excel Table, organize your data in rows and columns, as described in Section 1.3. Then follow these steps to create the Excel Table. 1. Select a cell in the source data, and on the Ribbon, click the Insert tab. 2. In the Tables group, click the Table command (see Figure 1-2).

The problem arises with applications that use variable length strings when they bind inputs, with the resulting no data found that is sure to follow: ops$tkyte@ORA11GR2> variable varchar2_bv varchar2(20) ops$tkyte@ORA11GR2> exec :varchar2_bv := 'Hello World'; PL/SQL procedure successfully completed. ops$tkyte@ORA11GR2> select * from t where char_column = :varchar2_bv; no rows selected ops$tkyte@ORA11GR2> select * from t where varchar2_column = :varchar2_bv; CHAR_COLUMN VARCHAR2_COLUMN -------------------- -------------------Hello World Hello World

So here, the search for the VARCHAR2 string worked, but the CHAR column did not The VARCHAR2 bind variable will not be promoted to a CHAR(20) in the same way as a character string literal At this point, many programmers form the opinion that bind variables don t work; we have to use literals That would be a very bad decision indeed The solution is to bind using a CHAR type: ops$tkyte@ORA11GR2> variable char_bv char(20) ops$tkyte@ORA11GR2> exec :char_bv := 'Hello World'; PL/SQL procedure successfully completed ops$tkyte@ORA11GR2> ops$tkyte@ORA11GR2> select * from t where char_column = :char_bv; CHAR_COLUMN VARCHAR2_COLUMN -------------------- -------------------Hello World Hello World ops$tkyte@ORA11GR2> select * from t where varchar2_column = :char_bv; no rows selected However, if you mix and match VARCHAR2 and CHAR, you ll be running into this issue constantly Not only that, but the developer is now having to consider the field width in her applications.

Listing 8-13. Prepared Queries in Ruby #!/usr/bin/env ruby require 'sqlite3' db = SQLite3::Database.new('foods.db') stmt = db.prepare('select name from episodes') stmt.execute do | result | result.each do | row | puts row[0] end end result = stmt.execute() result.each do | row | puts row[0] end stmt.close() It is important to call Statement.close() when you are done to finalize the query. Because a Statement object holds a sqlite3_stmt structure internally, each subsequent call to execute thus reuses the same query, avoiding the need to recompile the query.

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